Most visited

Recently visited

Results for

Added in API level 1

Activity

public class Activity
extends ContextThemeWrapper implements LayoutInflater.Factory2, Window.Callback, KeyEvent.Callback, View.OnCreateContextMenuListener, ComponentCallbacks2

java.lang.Object
↳	android.content.Context
	↳	android.content.ContextWrapper
		↳	android.view.ContextThemeWrapper
			↳	android.app.Activity

Known Direct Subclasses

AccountAuthenticatorActivity, ActivityGroup, AliasActivity, ExpandableListActivity, FragmentActivity, ListActivity, NativeActivity

Known Indirect Subclasses

ActionBarActivity, AppCompatActivity, LauncherActivity, PreferenceActivity, TabActivity

An activity is a single, focused thing that the user can do. Almost all activities interact with the user, so the Activity class takes care of creating a window for you in which you can place your UI with setContentView(View). While activities are often presented to the user as full-screen windows, they can also be used in other ways: as floating windows (via a theme with windowIsFloating set) or embedded inside of another activity (using ActivityGroup). There are two methods almost all subclasses of Activity will implement:

onCreate(Bundle) is where you initialize your activity. Most importantly, here you will usually call setContentView(int) with a layout resource defining your UI, and using findViewById(int) to retrieve the widgets in that UI that you need to interact with programmatically.
onPause() is where you deal with the user leaving your activity. Most importantly, any changes made by the user should at this point be committed (usually to the ContentProvider holding the data).

To be of use with Context.startActivity(), all activity classes must have a corresponding <activity> declaration in their package's AndroidManifest.xml.

Topics covered here:

Fragments
Activity Lifecycle
Configuration Changes
Starting Activities and Getting Results
Saving Persistent State
Permissions
Process Lifecycle

Developer Guides

The Activity class is an important part of an application's overall lifecycle, and the way activities are launched and put together is a fundamental part of the platform's application model. For a detailed perspective on the structure of an Android application and how activities behave, please read the Application Fundamentals and Tasks and Back Stack developer guides.

You can also find a detailed discussion about how to create activities in the Activities developer guide.

Fragments

Starting with HONEYCOMB, Activity implementations can make use of the Fragment class to better modularize their code, build more sophisticated user interfaces for larger screens, and help scale their application between small and large screens.

Activity Lifecycle

Activities in the system are managed as an activity stack. When a new activity is started, it is placed on the top of the stack and becomes the running activity -- the previous activity always remains below it in the stack, and will not come to the foreground again until the new activity exits.

An activity has essentially four states:

If an activity is in the foreground of the screen (at the top of the stack), it is active or running.
If an activity has lost focus but is still visible (that is, a new non-full-sized or transparent activity has focus on top of your activity), it is paused. A paused activity is completely alive (it maintains all state and member information and remains attached to the window manager), but can be killed by the system in extreme low memory situations.
If an activity is completely obscured by another activity, it is stopped. It still retains all state and member information, however, it is no longer visible to the user so its window is hidden and it will often be killed by the system when memory is needed elsewhere.
If an activity is paused or stopped, the system can drop the activity from memory by either asking it to finish, or simply killing its process. When it is displayed again to the user, it must be completely restarted and restored to its previous state.

The following diagram shows the important state paths of an Activity. The square rectangles represent callback methods you can implement to perform operations when the Activity moves between states. The colored ovals are major states the Activity can be in.

State diagram for an Android Activity Lifecycle.

There are three key loops you may be interested in monitoring within your activity:

The entire lifetime of an activity happens between the first call to onCreate(Bundle) through to a single final call to onDestroy(). An activity will do all setup of "global" state in onCreate(), and release all remaining resources in onDestroy(). For example, if it has a thread running in the background to download data from the network, it may create that thread in onCreate() and then stop the thread in onDestroy().
The visible lifetime of an activity happens between a call to onStart() until a corresponding call to onStop(). During this time the user can see the activity on-screen, though it may not be in the foreground and interacting with the user. Between these two methods you can maintain resources that are needed to show the activity to the user. For example, you can register a BroadcastReceiver in onStart() to monitor for changes that impact your UI, and unregister it in onStop() when the user no longer sees what you are displaying. The onStart() and onStop() methods can be called multiple times, as the activity becomes visible and hidden to the user.
The foreground lifetime of an activity happens between a call to onResume() until a corresponding call to onPause(). During this time the activity is in front of all other activities and interacting with the user. An activity can frequently go between the resumed and paused states -- for example when the device goes to sleep, when an activity result is delivered, when a new intent is delivered -- so the code in these methods should be fairly lightweight.

The entire lifecycle of an activity is defined by the following Activity methods. All of these are hooks that you can override to do appropriate work when the activity changes state. All activities will implement onCreate(Bundle) to do their initial setup; many will also implement onPause() to commit changes to data and otherwise prepare to stop interacting with the user. You should always call up to your superclass when implementing these methods.

 public class Activity extends ApplicationContext {
     protected void onCreate(Bundle savedInstanceState);

     protected void onStart();

     protected void onRestart();

     protected void onResume();

     protected void onPause();

     protected void onStop();

     protected void onDestroy();
 }

In general the movement through an activity's lifecycle looks like this:

Method			Description	Killable?	Next
`onCreate()`			Called when the activity is first created. This is where you should do all of your normal static set up: create views, bind data to lists, etc. This method also provides you with a Bundle containing the activity's previously frozen state, if there was one. Always followed by `onStart()`.	No	`onStart()`
	`onRestart()`		Called after your activity has been stopped, prior to it being started again. Always followed by `onStart()`	No	`onStart()`
	`onStart()`		Called when the activity is becoming visible to the user. Followed by `onResume()` if the activity comes to the foreground, or `onStop()` if it becomes hidden.	No	`onResume()` or `onStop()`
		`onResume()`	Called when the activity will start interacting with the user. At this point your activity is at the top of the activity stack, with user input going to it. Always followed by `onPause()`.	No	`onPause()`
		`onPause()`	Called when the system is about to start resuming a previous activity. This is typically used to commit unsaved changes to persistent data, stop animations and other things that may be consuming CPU, etc. Implementations of this method must be very quick because the next activity will not be resumed until this method returns. Followed by either `onResume()` if the activity returns back to the front, or `onStop()` if it becomes invisible to the user.	Pre-`HONEYCOMB`	`onResume()` or `onStop()`
	`onStop()`		Called when the activity is no longer visible to the user, because another activity has been resumed and is covering this one. This may happen either because a new activity is being started, an existing one is being brought in front of this one, or this one is being destroyed. Followed by either `onRestart()` if this activity is coming back to interact with the user, or `onDestroy()` if this activity is going away.	Yes	`onRestart()` or `onDestroy()`
`onDestroy()`			The final call you receive before your activity is destroyed. This can happen either because the activity is finishing (someone called `finish()` on it, or because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the `isFinishing()` method.	Yes	nothing

Note the "Killable" column in the above table -- for those methods that are marked as being killable, after that method returns the process hosting the activity may be killed by the system at any time without another line of its code being executed. Because of this, you should use the onPause() method to write any persistent data (such as user edits) to storage. In addition, the method onSaveInstanceState(Bundle) is called before placing the activity in such a background state, allowing you to save away any dynamic instance state in your activity into the given Bundle, to be later received in onCreate(Bundle) if the activity needs to be re-created. See the Process Lifecycle section for more information on how the lifecycle of a process is tied to the activities it is hosting. Note that it is important to save persistent data in onPause() instead of onSaveInstanceState(Bundle) because the latter is not part of the lifecycle callbacks, so will not be called in every situation as described in its documentation.

Be aware that these semantics will change slightly between applications targeting platforms starting with HONEYCOMB vs. those targeting prior platforms. Starting with Honeycomb, an application is not in the killable state until its onStop() has returned. This impacts when onSaveInstanceState(Bundle) may be called (it may be safely called after onPause() and allows and application to safely wait until onStop() to save persistent state.

For those methods that are not marked as being killable, the activity's process will not be killed by the system starting from the time the method is called and continuing after it returns. Thus an activity is in the killable state, for example, between after onPause() to the start of onResume().

Configuration Changes

If the configuration of the device (as defined by the Resources.Configuration class) changes, then anything displaying a user interface will need to update to match that configuration. Because Activity is the primary mechanism for interacting with the user, it includes special support for handling configuration changes.

Unless you specify otherwise, a configuration change (such as a change in screen orientation, language, input devices, etc) will cause your current activity to be destroyed, going through the normal activity lifecycle process of onPause(), onStop(), and onDestroy() as appropriate. If the activity had been in the foreground or visible to the user, once onDestroy() is called in that instance then a new instance of the activity will be created, with whatever savedInstanceState the previous instance had generated from onSaveInstanceState(Bundle).

This is done because any application resource, including layout files, can change based on any configuration value. Thus the only safe way to handle a configuration change is to re-retrieve all resources, including layouts, drawables, and strings. Because activities must already know how to save their state and re-create themselves from that state, this is a convenient way to have an activity restart itself with a new configuration.

In some special cases, you may want to bypass restarting of your activity based on one or more types of configuration changes. This is done with the android:configChanges attribute in its manifest. For any types of configuration changes you say that you handle there, you will receive a call to your current activity's onConfigurationChanged(Configuration) method instead of being restarted. If a configuration change involves any that you do not handle, however, the activity will still be restarted and onConfigurationChanged(Configuration) will not be called.

Starting Activities and Getting Results

The startActivity(Intent) method is used to start a new activity, which will be placed at the top of the activity stack. It takes a single argument, an Intent, which describes the activity to be executed.

Sometimes you want to get a result back from an activity when it ends. For example, you may start an activity that lets the user pick a person in a list of contacts; when it ends, it returns the person that was selected. To do this, you call the startActivityForResult(Intent, int) version with a second integer parameter identifying the call. The result will come back through your onActivityResult(int, int, Intent) method.

When an activity exits, it can call setResult(int) to return data back to its parent. It must always supply a result code, which can be the standard results RESULT_CANCELED, RESULT_OK, or any custom values starting at RESULT_FIRST_USER. In addition, it can optionally return back an Intent containing any additional data it wants. All of this information appears back on the parent's Activity.onActivityResult(), along with the integer identifier it originally supplied.

If a child activity fails for any reason (such as crashing), the parent activity will receive a result with the code RESULT_CANCELED.

 public class MyActivity extends Activity {
     ...

     static final int PICK_CONTACT_REQUEST = 0;

     public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
             // When the user center presses, let them pick a contact.
             startActivityForResult(
                 new Intent(Intent.ACTION_PICK,
                 new Uri("content://contacts")),
                 PICK_CONTACT_REQUEST);
            return true;
         }
         return false;
     }

     protected void onActivityResult(int requestCode, int resultCode,
             Intent data) {
         if (requestCode == PICK_CONTACT_REQUEST) {
             if (resultCode == RESULT_OK) {
                 // A contact was picked.  Here we will just display it
                 // to the user.
                 startActivity(new Intent(Intent.ACTION_VIEW, data));
             }
         }
     }
 }

Saving Persistent State

There are generally two kinds of persistent state than an activity will deal with: shared document-like data (typically stored in a SQLite database using a content provider) and internal state such as user preferences.

For content provider data, we suggest that activities use a "edit in place" user model. That is, any edits a user makes are effectively made immediately without requiring an additional confirmation step. Supporting this model is generally a simple matter of following two rules:

When creating a new document, the backing database entry or file for it is created immediately. For example, if the user chooses to write a new e-mail, a new entry for that e-mail is created as soon as they start entering data, so that if they go to any other activity after that point this e-mail will now appear in the list of drafts.
When an activity's onPause() method is called, it should commit to the backing content provider or file any changes the user has made. This ensures that those changes will be seen by any other activity that is about to run. You will probably want to commit your data even more aggressively at key times during your activity's lifecycle: for example before starting a new activity, before finishing your own activity, when the user switches between input fields, etc.

This model is designed to prevent data loss when a user is navigating between activities, and allows the system to safely kill an activity (because system resources are needed somewhere else) at any time after it has been paused. Note this implies that the user pressing BACK from your activity does not mean "cancel" -- it means to leave the activity with its current contents saved away. Canceling edits in an activity must be provided through some other mechanism, such as an explicit "revert" or "undo" option.

See the content package for more information about content providers. These are a key aspect of how different activities invoke and propagate data between themselves.

The Activity class also provides an API for managing internal persistent state associated with an activity. This can be used, for example, to remember the user's preferred initial display in a calendar (day view or week view) or the user's default home page in a web browser.

Activity persistent state is managed with the method getPreferences(int), allowing you to retrieve and modify a set of name/value pairs associated with the activity. To use preferences that are shared across multiple application components (activities, receivers, services, providers), you can use the underlying Context.getSharedPreferences() method to retrieve a preferences object stored under a specific name. (Note that it is not possible to share settings data across application packages -- for that you will need a content provider.)

Here is an excerpt from a calendar activity that stores the user's preferred view mode in its persistent settings:

 public class CalendarActivity extends Activity {
     ...

     static final int DAY_VIEW_MODE = 0;
     static final int WEEK_VIEW_MODE = 1;

     private SharedPreferences mPrefs;
     private int mCurViewMode;

     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         SharedPreferences mPrefs = getSharedPreferences();
         mCurViewMode = mPrefs.getInt("view_mode", DAY_VIEW_MODE);
     }

     protected void onPause() {
         super.onPause();

         SharedPreferences.Editor ed = mPrefs.edit();
         ed.putInt("view_mode", mCurViewMode);
         ed.commit();
     }
 }

Permissions

The ability to start a particular Activity can be enforced when it is declared in its manifest's <activity> tag. By doing so, other applications will need to declare a corresponding <uses-permission> element in their own manifest to be able to start that activity.

When starting an Activity you can set Intent.FLAG_GRANT_READ_URI_PERMISSION and/or Intent.FLAG_GRANT_WRITE_URI_PERMISSION on the Intent. This will grant the Activity access to the specific URIs in the Intent. Access will remain until the Activity has finished (it will remain across the hosting process being killed and other temporary destruction). As of GINGERBREAD, if the Activity was already created and a new Intent is being delivered to onNewIntent(Intent), any newly granted URI permissions will be added to the existing ones it holds.

See the Security and Permissions document for more information on permissions and security in general.

Process Lifecycle

The Android system attempts to keep application process around for as long as possible, but eventually will need to remove old processes when memory runs low. As described in Activity Lifecycle, the decision about which process to remove is intimately tied to the state of the user's interaction with it. In general, there are four states a process can be in based on the activities running in it, listed here in order of importance. The system will kill less important processes (the last ones) before it resorts to killing more important processes (the first ones).

The foreground activity (the activity at the top of the screen that the user is currently interacting with) is considered the most important. Its process will only be killed as a last resort, if it uses more memory than is available on the device. Generally at this point the device has reached a memory paging state, so this is required in order to keep the user interface responsive.
A visible activity (an activity that is visible to the user but not in the foreground, such as one sitting behind a foreground dialog) is considered extremely important and will not be killed unless that is required to keep the foreground activity running.
A background activity (an activity that is not visible to the user and has been paused) is no longer critical, so the system may safely kill its process to reclaim memory for other foreground or visible processes. If its process needs to be killed, when the user navigates back to the activity (making it visible on the screen again), its onCreate(Bundle) method will be called with the savedInstanceState it had previously supplied in onSaveInstanceState(Bundle) so that it can restart itself in the same state as the user last left it.
An empty process is one hosting no activities or other application components (such as Service or BroadcastReceiver classes). These are killed very quickly by the system as memory becomes low. For this reason, any background operation you do outside of an activity must be executed in the context of an activity BroadcastReceiver or Service to ensure that the system knows it needs to keep your process around.

Sometimes an Activity may need to do a long-running operation that exists independently of the activity lifecycle itself. An example may be a camera application that allows you to upload a picture to a web site. The upload may take a long time, and the application should allow the user to leave the application while it is executing. To accomplish this, your Activity should start a Service in which the upload takes place. This allows the system to properly prioritize your process (considering it to be more important than other non-visible applications) for the duration of the upload, independent of whether the original activity is paused, stopped, or finished.

Summary

Constants
`int`	`DEFAULT_KEYS_DIALER` Use with `setDefaultKeyMode(int)` to launch the dialer during default key handling.
`int`	`DEFAULT_KEYS_DISABLE` Use with `setDefaultKeyMode(int)` to turn off default handling of keys.
`int`	`DEFAULT_KEYS_SEARCH_GLOBAL` Use with `setDefaultKeyMode(int)` to specify that unhandled keystrokes will start a global search (typically web search, but some platforms may define alternate methods for global search) See `android.app.SearchManager` for more details.
`int`	`DEFAULT_KEYS_SEARCH_LOCAL` Use with `setDefaultKeyMode(int)` to specify that unhandled keystrokes will start an application-defined search.
`int`	`DEFAULT_KEYS_SHORTCUT` Use with `setDefaultKeyMode(int)` to execute a menu shortcut in default key handling.
`int`	`RESULT_CANCELED` Standard activity result: operation canceled.
`int`	`RESULT_FIRST_USER` Start of user-defined activity results.
`int`	`RESULT_OK` Standard activity result: operation succeeded.

Inherited constants

From class


    android.content.Context

From interface


    android.content.ComponentCallbacks2

Fields
`protected static final int[]`	`FOCUSED_STATE_SET`

Public constructors
`Activity()`

Public methods
`void`	`addContentView(View view, ViewGroup.LayoutParams params)` Add an additional content view to the activity.
`void`	`closeContextMenu()` Programmatically closes the most recently opened context menu, if showing.
`void`	`closeOptionsMenu()` Progammatically closes the options menu.
`PendingIntent`	`createPendingResult(int requestCode, Intent data, int flags)` Create a new PendingIntent object which you can hand to others for them to use to send result data back to your `onActivityResult(int, int, Intent)` callback.
`final void`	`dismissDialog(int id)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`final void`	`dismissKeyboardShortcutsHelper()` Dismiss the Keyboard Shortcuts screen.
`boolean`	`dispatchGenericMotionEvent(MotionEvent ev)` Called to process generic motion events.
`boolean`	`dispatchKeyEvent(KeyEvent event)` Called to process key events.
`boolean`	`dispatchKeyShortcutEvent(KeyEvent event)` Called to process a key shortcut event.
`boolean`	`dispatchPopulateAccessibilityEvent(AccessibilityEvent event)` Called to process population of `AccessibilityEvent`s.
`boolean`	`dispatchTouchEvent(MotionEvent ev)` Called to process touch screen events.
`boolean`	`dispatchTrackballEvent(MotionEvent ev)` Called to process trackball events.
`void`	`dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args)` Print the Activity's state into the given stream.
`void`	`enterPictureInPictureMode()` Puts the activity in picture-in-picture mode.
`View`	`findViewById(int id)` Finds a view that was identified by the id attribute from the XML that was processed in `onCreate(Bundle)`.
`void`	`finish()` Call this when your activity is done and should be closed.
`void`	`finishActivity(int requestCode)` Force finish another activity that you had previously started with `startActivityForResult(Intent, int)`.
`void`	`finishActivityFromChild(Activity child, int requestCode)` This is called when a child activity of this one calls its finishActivity().
`void`	`finishAffinity()` Finish this activity as well as all activities immediately below it in the current task that have the same affinity.
`void`	`finishAfterTransition()` Reverses the Activity Scene entry Transition and triggers the calling Activity to reverse its exit Transition.
`void`	`finishAndRemoveTask()` Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the root activity of the task.
`void`	`finishFromChild(Activity child)` This is called when a child activity of this one calls its `finish()` method.
`ActionBar`	`getActionBar()` Retrieve a reference to this activity's ActionBar.
`final Application`	`getApplication()` Return the application that owns this activity.
`ComponentName`	`getCallingActivity()` Return the name of the activity that invoked this activity.
`String`	`getCallingPackage()` Return the name of the package that invoked this activity.
`int`	`getChangingConfigurations()` If this activity is being destroyed because it can not handle a configuration parameter being changed (and thus its `onConfigurationChanged(Configuration)` method is not being called), then you can use this method to discover the set of changes that have occurred while in the process of being destroyed.
`ComponentName`	`getComponentName()` Returns complete component name of this activity.
`Scene`	`getContentScene()` Retrieve the `Scene` representing this window's current content.
`TransitionManager`	`getContentTransitionManager()` Retrieve the `TransitionManager` responsible for default transitions in this window.
`View`	`getCurrentFocus()` Calls `getCurrentFocus()` on the Window of this Activity to return the currently focused view.
`FragmentManager`	`getFragmentManager()` Return the FragmentManager for interacting with fragments associated with this activity.
`Intent`	`getIntent()` Return the intent that started this activity.
`Object`	`getLastNonConfigurationInstance()` Retrieve the non-configuration instance data that was previously returned by `onRetainNonConfigurationInstance()`.
`LayoutInflater`	`getLayoutInflater()` Convenience for calling `getLayoutInflater()`.
`LoaderManager`	`getLoaderManager()` Return the LoaderManager for this activity, creating it if needed.
`String`	`getLocalClassName()` Returns class name for this activity with the package prefix removed.
`final MediaController`	`getMediaController()` Gets the controller which should be receiving media key and volume events while this activity is in the foreground.
`MenuInflater`	`getMenuInflater()` Returns a `MenuInflater` with this context.
`final Activity`	`getParent()` Return the parent activity if this view is an embedded child.
`Intent`	`getParentActivityIntent()` Obtain an `Intent` that will launch an explicit target activity specified by this activity's logical parent.
`SharedPreferences`	`getPreferences(int mode)` Retrieve a `SharedPreferences` object for accessing preferences that are private to this activity.
`Uri`	`getReferrer()` Return information about who launched this activity.
`int`	`getRequestedOrientation()` Return the current requested orientation of the activity.
`final SearchEvent`	`getSearchEvent()` During the onSearchRequested() callbacks, this function will return the `SearchEvent` that triggered the callback, if it exists.
`Object`	`getSystemService(String name)` Return the handle to a system-level service by name.
`int`	`getTaskId()` Return the identifier of the task this activity is in.
`final CharSequence`	`getTitle()`
`final int`	`getTitleColor()`
`VoiceInteractor`	`getVoiceInteractor()` Retrieve the active `VoiceInteractor` that the user is going through to interact with this activity.
`final int`	`getVolumeControlStream()` Gets the suggested audio stream whose volume should be changed by the hardware volume controls.
`Window`	`getWindow()` Retrieve the current `Window` for the activity.
`WindowManager`	`getWindowManager()` Retrieve the window manager for showing custom windows.
`boolean`	`hasWindowFocus()` Returns true if this activity's main window currently has window focus.
`void`	`invalidateOptionsMenu()` Declare that the options menu has changed, so should be recreated.
`boolean`	`isChangingConfigurations()` Check to see whether this activity is in the process of being destroyed in order to be recreated with a new configuration.
`final boolean`	`isChild()` Is this activity embedded inside of another activity?
`boolean`	`isDestroyed()` Returns true if the final `onDestroy()` call has been made on the Activity, so this instance is now dead.
`boolean`	`isFinishing()` Check to see whether this activity is in the process of finishing, either because you called `finish()` on it or someone else has requested that it finished.
`boolean`	`isImmersive()` Bit indicating that this activity is "immersive" and should not be interrupted by notifications if possible.
`boolean`	`isInMultiWindowMode()` Returns true if the activity is currently in multi-window mode.
`boolean`	`isInPictureInPictureMode()` Returns true if the activity is currently in picture-in-picture mode.
`boolean`	`isLocalVoiceInteractionSupported()` Queries whether the currently enabled voice interaction service supports returning a voice interactor for use by the activity.
`boolean`	`isTaskRoot()` Return whether this activity is the root of a task.
`boolean`	`isVoiceInteraction()` Check whether this activity is running as part of a voice interaction with the user.
`boolean`	`isVoiceInteractionRoot()` Like `isVoiceInteraction()`, but only returns true if this is also the root of a voice interaction.
`final Cursor`	`managedQuery(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)` This method was deprecated in API level 11. Use `CursorLoader` instead.
`boolean`	`moveTaskToBack(boolean nonRoot)` Move the task containing this activity to the back of the activity stack.
`boolean`	`navigateUpTo(Intent upIntent)` Navigate from this activity to the activity specified by upIntent, finishing this activity in the process.
`boolean`	`navigateUpToFromChild(Activity child, Intent upIntent)` This is called when a child activity of this one calls its `navigateUpTo(Intent)` method.
`void`	`onActionModeFinished(ActionMode mode)` Notifies the activity that an action mode has finished.
`void`	`onActionModeStarted(ActionMode mode)` Notifies the Activity that an action mode has been started.
`void`	`onActivityReenter(int resultCode, Intent data)` Called when an activity you launched with an activity transition exposes this Activity through a returning activity transition, giving you the resultCode and any additional data from it.
`void`	`onAttachFragment(Fragment fragment)` Called when a Fragment is being attached to this activity, immediately after the call to its `Fragment.onAttach()` method and before `Fragment.onCreate()`.
`void`	`onAttachedToWindow()` Called when the main window associated with the activity has been attached to the window manager.
`void`	`onBackPressed()` Called when the activity has detected the user's press of the back key.
`void`	`onConfigurationChanged(Configuration newConfig)` Called by the system when the device configuration changes while your activity is running.
`void`	`onContentChanged()` This hook is called whenever the content view of the screen changes (due to a call to `Window.setContentView` or `Window.addContentView`).
`boolean`	`onContextItemSelected(MenuItem item)` This hook is called whenever an item in a context menu is selected.
`void`	`onContextMenuClosed(Menu menu)` This hook is called whenever the context menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).
`void`	`onCreate(Bundle savedInstanceState, PersistableBundle persistentState)` Same as `onCreate(android.os.Bundle)` but called for those activities created with the attribute `persistableMode` set to `persistAcrossReboots`.
`void`	`onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)` Called when a context menu for the `view` is about to be shown.
`CharSequence`	`onCreateDescription()` Generate a new description for this activity.
`void`	`onCreateNavigateUpTaskStack(TaskStackBuilder builder)` Define the synthetic task stack that will be generated during Up navigation from a different task.
`boolean`	`onCreateOptionsMenu(Menu menu)` Initialize the contents of the Activity's standard options menu.
`boolean`	`onCreatePanelMenu(int featureId, Menu menu)` Default implementation of `onCreatePanelMenu(int, Menu)` for activities.
`View`	`onCreatePanelView(int featureId)` Default implementation of `onCreatePanelView(int)` for activities.
`boolean`	`onCreateThumbnail(Bitmap outBitmap, Canvas canvas)` Generate a new thumbnail for this activity.
`View`	`onCreateView(View parent, String name, Context context, AttributeSet attrs)` Standard implementation of `onCreateView(View, String, Context, AttributeSet)` used when inflating with the LayoutInflater returned by `getSystemService(Class)`.
`View`	`onCreateView(String name, Context context, AttributeSet attrs)` Standard implementation of `onCreateView(String, Context, AttributeSet)` used when inflating with the LayoutInflater returned by `getSystemService(Class)`.
`void`	`onDetachedFromWindow()` Called when the main window associated with the activity has been detached from the window manager.
`void`	`onEnterAnimationComplete()` Activities cannot draw during the period that their windows are animating in.
`boolean`	`onGenericMotionEvent(MotionEvent event)` Called when a generic motion event was not handled by any of the views inside of the activity.
`boolean`	`onKeyDown(int keyCode, KeyEvent event)` Called when a key was pressed down and not handled by any of the views inside of the activity.
`boolean`	`onKeyLongPress(int keyCode, KeyEvent event)` Default implementation of `KeyEvent.Callback.onKeyLongPress()`: always returns false (doesn't handle the event).
`boolean`	`onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)` Default implementation of `KeyEvent.Callback.onKeyMultiple()`: always returns false (doesn't handle the event).
`boolean`	`onKeyShortcut(int keyCode, KeyEvent event)` Called when a key shortcut event is not handled by any of the views in the Activity.
`boolean`	`onKeyUp(int keyCode, KeyEvent event)` Called when a key was released and not handled by any of the views inside of the activity.
`void`	`onLocalVoiceInteractionStarted()` Callback to indicate that `startLocalVoiceInteraction(Bundle)` has resulted in a voice interaction session being started.
`void`	`onLocalVoiceInteractionStopped()` Callback to indicate that the local voice interaction has stopped either because it was requested through a call to `stopLocalVoiceInteraction()` or because it was canceled by the user.
`void`	`onLowMemory()` This is called when the overall system is running low on memory, and actively running processes should trim their memory usage.
`boolean`	`onMenuItemSelected(int featureId, MenuItem item)` Default implementation of `onMenuItemSelected(int, MenuItem)` for activities.
`boolean`	`onMenuOpened(int featureId, Menu menu)` Called when a panel's menu is opened by the user.
`void`	`onMultiWindowModeChanged(boolean isInMultiWindowMode)` Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa.
`boolean`	`onNavigateUp()` This method is called whenever the user chooses to navigate Up within your application's activity hierarchy from the action bar.
`boolean`	`onNavigateUpFromChild(Activity child)` This is called when a child activity of this one attempts to navigate up.
`boolean`	`onOptionsItemSelected(MenuItem item)` This hook is called whenever an item in your options menu is selected.
`void`	`onOptionsMenuClosed(Menu menu)` This hook is called whenever the options menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).
`void`	`onPanelClosed(int featureId, Menu menu)` Default implementation of `onPanelClosed(int, Menu)` for activities.
`void`	`onPictureInPictureModeChanged(boolean isInPictureInPictureMode)` Called by the system when the activity changes to and from picture-in-picture mode.
`void`	`onPostCreate(Bundle savedInstanceState, PersistableBundle persistentState)` This is the same as `onPostCreate(Bundle)` but is called for activities created with the attribute `persistableMode` set to `persistAcrossReboots`.
`void`	`onPrepareNavigateUpTaskStack(TaskStackBuilder builder)` Prepare the synthetic task stack that will be generated during Up navigation from a different task.
`boolean`	`onPrepareOptionsMenu(Menu menu)` Prepare the Screen's standard options menu to be displayed.
`boolean`	`onPreparePanel(int featureId, View view, Menu menu)` Default implementation of `onPreparePanel(int, View, Menu)` for activities.
`void`	`onProvideAssistContent(AssistContent outContent)` This is called when the user is requesting an assist, to provide references to content related to the current activity.
`void`	`onProvideAssistData(Bundle data)` This is called when the user is requesting an assist, to build a full `ACTION_ASSIST` Intent with all of the context of the current application.
`void`	`onProvideKeyboardShortcuts(List<KeyboardShortcutGroup> data, Menu menu, int deviceId)` Called when Keyboard Shortcuts are requested for the current window.
`Uri`	`onProvideReferrer()` Override to generate the desired referrer for the content currently being shown by the app.
`void`	`onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults)` Callback for the result from requesting permissions.
`void`	`onRestoreInstanceState(Bundle savedInstanceState, PersistableBundle persistentState)` This is the same as `onRestoreInstanceState(Bundle)` but is called for activities created with the attribute `persistableMode` set to `persistAcrossReboots`.
`Object`	`onRetainNonConfigurationInstance()` Called by the system, as part of destroying an activity due to a configuration change, when it is known that a new instance will immediately be created for the new configuration.
`void`	`onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState)` This is the same as `onSaveInstanceState(Bundle)` but is called for activities created with the attribute `persistableMode` set to `persistAcrossReboots`.
`boolean`	`onSearchRequested(SearchEvent searchEvent)` This hook is called when the user signals the desire to start a search.
`boolean`	`onSearchRequested()` Called when the user signals the desire to start a search.
`void`	`onStateNotSaved()` Called when an `onResume()` is coming up, prior to other pre-resume callbacks such as `onNewIntent(Intent)` and `onActivityResult(int, int, Intent)`.
`boolean`	`onTouchEvent(MotionEvent event)` Called when a touch screen event was not handled by any of the views under it.
`boolean`	`onTrackballEvent(MotionEvent event)` Called when the trackball was moved and not handled by any of the views inside of the activity.
`void`	`onTrimMemory(int level)` Called when the operating system has determined that it is a good time for a process to trim unneeded memory from its process.
`void`	`onUserInteraction()` Called whenever a key, touch, or trackball event is dispatched to the activity.
`void`	`onVisibleBehindCanceled()` Called when a translucent activity over this activity is becoming opaque or another activity is being launched.
`void`	`onWindowAttributesChanged(WindowManager.LayoutParams params)` This is called whenever the current window attributes change.
`void`	`onWindowFocusChanged(boolean hasFocus)` Called when the current `Window` of the activity gains or loses focus.
`ActionMode`	`onWindowStartingActionMode(ActionMode.Callback callback, int type)` Called when an action mode is being started for this window.
`ActionMode`	`onWindowStartingActionMode(ActionMode.Callback callback)` Give the Activity a chance to control the UI for an action mode requested by the system.
`void`	`openContextMenu(View view)` Programmatically opens the context menu for a particular `view`.
`void`	`openOptionsMenu()` Programmatically opens the options menu.
`void`	`overridePendingTransition(int enterAnim, int exitAnim)` Call immediately after one of the flavors of `startActivity(Intent)` or `finish()` to specify an explicit transition animation to perform next.
`void`	`postponeEnterTransition()` Postpone the entering activity transition when Activity was started with `makeSceneTransitionAnimation(Activity, android.util.Pair[])`.
`void`	`recreate()` Cause this Activity to be recreated with a new instance.
`void`	`registerForContextMenu(View view)` Registers a context menu to be shown for the given view (multiple views can show the context menu).
`boolean`	`releaseInstance()` Ask that the local app instance of this activity be released to free up its memory.
`final void`	`removeDialog(int id)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`void`	`reportFullyDrawn()` Report to the system that your app is now fully drawn, purely for diagnostic purposes (calling it does not impact the visible behavior of the activity).
`DragAndDropPermissions`	`requestDragAndDropPermissions(DragEvent event)` Create `DragAndDropPermissions` object bound to this activity and controlling the access permissions for content URIs associated with the `DragEvent`.
`final void`	`requestPermissions(String[] permissions, int requestCode)` Requests permissions to be granted to this application.
`final void`	`requestShowKeyboardShortcuts()` Request the Keyboard Shortcuts screen to show up.
`boolean`	`requestVisibleBehind(boolean visible)` Activities that want to remain visible behind a translucent activity above them must call this method anytime between the start of `onResume()` and the return from `onPause()`.
`final boolean`	`requestWindowFeature(int featureId)` Enable extended window features.
`final void`	`runOnUiThread(Runnable action)` Runs the specified action on the UI thread.
`void`	`setActionBar(Toolbar toolbar)` Set a `Toolbar` to act as the `ActionBar` for this Activity window.
`void`	`setContentTransitionManager(TransitionManager tm)` Set the `TransitionManager` to use for default transitions in this window.
`void`	`setContentView(View view, ViewGroup.LayoutParams params)` Set the activity content to an explicit view.
`void`	`setContentView(View view)` Set the activity content to an explicit view.
`void`	`setContentView(int layoutResID)` Set the activity content from a layout resource.
`final void`	`setDefaultKeyMode(int mode)` Select the default key handling for this activity.
`void`	`setEnterSharedElementCallback(SharedElementCallback callback)` When `makeSceneTransitionAnimation(Activity, android.view.View, String)` was used to start an Activity, `callback` will be called to handle shared elements on the launched Activity.
`void`	`setExitSharedElementCallback(SharedElementCallback callback)` When `makeSceneTransitionAnimation(Activity, android.view.View, String)` was used to start an Activity, `callback` will be called to handle shared elements on the launching Activity.
`final void`	`setFeatureDrawable(int featureId, Drawable drawable)` Convenience for calling `setFeatureDrawable(int, Drawable)`.
`final void`	`setFeatureDrawableAlpha(int featureId, int alpha)` Convenience for calling `setFeatureDrawableAlpha(int, int)`.
`final void`	`setFeatureDrawableResource(int featureId, int resId)` Convenience for calling `setFeatureDrawableResource(int, int)`.
`final void`	`setFeatureDrawableUri(int featureId, Uri uri)` Convenience for calling `setFeatureDrawableUri(int, Uri)`.
`void`	`setFinishOnTouchOutside(boolean finish)` Sets whether this activity is finished when touched outside its window's bounds.
`void`	`setImmersive(boolean i)` Adjust the current immersive mode setting.
`void`	`setIntent(Intent newIntent)` Change the intent returned by `getIntent()`.
`final void`	`setMediaController(MediaController controller)` Sets a `MediaController` to send media keys and volume changes to.
`final void`	`setProgress(int progress)` This method was deprecated in API level 24. No longer supported starting in API 21.
`final void`	`setProgressBarIndeterminate(boolean indeterminate)` This method was deprecated in API level 24. No longer supported starting in API 21.
`final void`	`setProgressBarIndeterminateVisibility(boolean visible)` This method was deprecated in API level 24. No longer supported starting in API 21.
`final void`	`setProgressBarVisibility(boolean visible)` This method was deprecated in API level 24. No longer supported starting in API 21.
`void`	`setRequestedOrientation(int requestedOrientation)` Change the desired orientation of this activity.
`final void`	`setResult(int resultCode, Intent data)` Call this to set the result that your activity will return to its caller.
`final void`	`setResult(int resultCode)` Call this to set the result that your activity will return to its caller.
`final void`	`setSecondaryProgress(int secondaryProgress)` This method was deprecated in API level 24. No longer supported starting in API 21.
`void`	`setTaskDescription(ActivityManager.TaskDescription taskDescription)` Sets information describing the task with this activity for presentation inside the Recents System UI.
`void`	`setTheme(int resid)` Set the base theme for this context.
`void`	`setTitle(CharSequence title)` Change the title associated with this activity.
`void`	`setTitle(int titleId)` Change the title associated with this activity.
`void`	`setTitleColor(int textColor)` This method was deprecated in API level 21. Use action bar styles instead.
`void`	`setVisible(boolean visible)` Control whether this activity's main window is visible.
`final void`	`setVolumeControlStream(int streamType)` Suggests an audio stream whose volume should be changed by the hardware volume controls.
`void`	`setVrModeEnabled(boolean enabled, ComponentName requestedComponent)` Enable or disable virtual reality (VR) mode for this Activity.
`boolean`	`shouldShowRequestPermissionRationale(String permission)` Gets whether you should show UI with rationale for requesting a permission.
`boolean`	`shouldUpRecreateTask(Intent targetIntent)` Returns true if the app should recreate the task when navigating 'up' from this activity by using targetIntent.
`boolean`	`showAssist(Bundle args)` Ask to have the current assistant shown to the user.
`final boolean`	`showDialog(int id, Bundle args)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`final void`	`showDialog(int id)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`void`	`showLockTaskEscapeMessage()` Shows the user the system defined message for telling the user how to exit lock task mode.
`ActionMode`	`startActionMode(ActionMode.Callback callback, int type)` Start an action mode of the given type.
`ActionMode`	`startActionMode(ActionMode.Callback callback)` Start an action mode of the default type `TYPE_PRIMARY`.
`void`	`startActivities(Intent[] intents, Bundle options)` Launch a new activity.
`void`	`startActivities(Intent[] intents)` Same as `startActivities(Intent[], Bundle)` with no options specified.
`void`	`startActivity(Intent intent)` Same as `startActivity(Intent, Bundle)` with no options specified.
`void`	`startActivity(Intent intent, Bundle options)` Launch a new activity.
`void`	`startActivityForResult(Intent intent, int requestCode)` Same as calling `startActivityForResult(Intent, int, Bundle)` with no options.
`void`	`startActivityForResult(Intent intent, int requestCode, Bundle options)` Launch an activity for which you would like a result when it finished.
`void`	`startActivityFromChild(Activity child, Intent intent, int requestCode)` Same as calling `startActivityFromChild(Activity, Intent, int, Bundle)` with no options.
`void`	`startActivityFromChild(Activity child, Intent intent, int requestCode, Bundle options)` This is called when a child activity of this one calls its `startActivity(Intent)` or `startActivityForResult(Intent, int)` method.
`void`	`startActivityFromFragment(Fragment fragment, Intent intent, int requestCode, Bundle options)` This is called when a Fragment in this activity calls its `startActivity(Intent)` or `startActivityForResult(Intent, int)` method.
`void`	`startActivityFromFragment(Fragment fragment, Intent intent, int requestCode)` Same as calling `startActivityFromFragment(Fragment, Intent, int, Bundle)` with no options.
`boolean`	`startActivityIfNeeded(Intent intent, int requestCode, Bundle options)` A special variation to launch an activity only if a new activity instance is needed to handle the given Intent.
`boolean`	`startActivityIfNeeded(Intent intent, int requestCode)` Same as calling `startActivityIfNeeded(Intent, int, Bundle)` with no options.
`void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)` Same as calling `startIntentSender(IntentSender, Intent, int, int, int, Bundle)` with no options.
`void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options)` Like `startActivity(Intent, Bundle)`, but taking a IntentSender to start; see `startIntentSenderForResult(IntentSender, int, Intent, int, int, int, Bundle)` for more information.
`void`	`startIntentSenderForResult(IntentSender intent, int requestCode, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)` Same as calling `startIntentSenderForResult(IntentSender, int, Intent, int, int, int, Bundle)` with no options.
`void`	`startIntentSenderForResult(IntentSender intent, int requestCode, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options)` Like `startActivityForResult(Intent, int)`, but allowing you to use a IntentSender to describe the activity to be started.
`void`	`startIntentSenderFromChild(Activity child, IntentSender intent, int requestCode, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options)` Like `startActivityFromChild(Activity, Intent, int)`, but taking a IntentSender; see `startIntentSenderForResult(IntentSender, int, Intent, int, int, int)` for more information.
`void`	`startIntentSenderFromChild(Activity child, IntentSender intent, int requestCode, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)` Same as calling `startIntentSenderFromChild(Activity, IntentSender, int, Intent, int, int, int, Bundle)` with no options.
`void`	`startLocalVoiceInteraction(Bundle privateOptions)` Starts a local voice interaction session.
`void`	`startLockTask()` Request to put this Activity in a mode where the user is locked to the current task.
`void`	`startManagingCursor(Cursor c)` This method was deprecated in API level 11. Use the new `CursorLoader` class with `LoaderManager` instead; this is also available on older platforms through the Android compatibility package.
`boolean`	`startNextMatchingActivity(Intent intent, Bundle options)` Special version of starting an activity, for use when you are replacing other activity components.
`boolean`	`startNextMatchingActivity(Intent intent)` Same as calling `startNextMatchingActivity(Intent, Bundle)` with no options.
`void`	`startPostponedEnterTransition()` Begin postponed transitions after `postponeEnterTransition()` was called.
`void`	`startSearch(String initialQuery, boolean selectInitialQuery, Bundle appSearchData, boolean globalSearch)` This hook is called to launch the search UI.
`void`	`stopLocalVoiceInteraction()` Request to terminate the current voice interaction that was previously started using `startLocalVoiceInteraction(Bundle)`.
`void`	`stopLockTask()` Allow the user to switch away from the current task.
`void`	`stopManagingCursor(Cursor c)` This method was deprecated in API level 11. Use the new `CursorLoader` class with `LoaderManager` instead; this is also available on older platforms through the Android compatibility package.
`void`	`takeKeyEvents(boolean get)` Request that key events come to this activity.
`void`	`triggerSearch(String query, Bundle appSearchData)` Similar to `startSearch(String, boolean, Bundle, boolean)`, but actually fires off the search query after invoking the search dialog.
`void`	`unregisterForContextMenu(View view)` Prevents a context menu to be shown for the given view.

Protected methods
`void`	`onActivityResult(int requestCode, int resultCode, Intent data)` Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it.
`void`	`onApplyThemeResource(Resources.Theme theme, int resid, boolean first)` Called by `setTheme(int)` and `getTheme()` to apply a theme resource to the current Theme object.
`void`	`onChildTitleChanged(Activity childActivity, CharSequence title)`
`void`	`onCreate(Bundle savedInstanceState)` Called when the activity is starting.
`Dialog`	`onCreateDialog(int id)` This method was deprecated in API level 8. Old no-arguments version of `onCreateDialog(int, Bundle)`.
`Dialog`	`onCreateDialog(int id, Bundle args)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`void`	`onDestroy()` Perform any final cleanup before an activity is destroyed.
`void`	`onNewIntent(Intent intent)` This is called for activities that set launchMode to "singleTop" in their package, or if a client used the `FLAG_ACTIVITY_SINGLE_TOP` flag when calling `startActivity(Intent)`.
`void`	`onPause()` Called as part of the activity lifecycle when an activity is going into the background, but has not (yet) been killed.
`void`	`onPostCreate(Bundle savedInstanceState)` Called when activity start-up is complete (after `onStart()` and `onRestoreInstanceState(Bundle)` have been called).
`void`	`onPostResume()` Called when activity resume is complete (after `onResume()` has been called).
`void`	`onPrepareDialog(int id, Dialog dialog, Bundle args)` This method was deprecated in API level 13. Use the new `DialogFragment` class with `FragmentManager` instead; this is also available on older platforms through the Android compatibility package.
`void`	`onPrepareDialog(int id, Dialog dialog)` This method was deprecated in API level 8. Old no-arguments version of `onPrepareDialog(int, Dialog, Bundle)`.
`void`	`onRestart()` Called after `onStop()` when the current activity is being re-displayed to the user (the user has navigated back to it).
`void`	`onRestoreInstanceState(Bundle savedInstanceState)` This method is called after `onStart()` when the activity is being re-initialized from a previously saved state, given here in `savedInstanceState`.
`void`	`onResume()` Called after `onRestoreInstanceState(Bundle)`, `onRestart()`, or `onPause()`, for your activity to start interacting with the user.
`void`	`onSaveInstanceState(Bundle outState)` Called to retrieve per-instance state from an activity before being killed so that the state can be restored in `onCreate(Bundle)` or `onRestoreInstanceState(Bundle)` (the `Bundle` populated by this method will be passed to both).
`void`	`onStart()` Called after `onCreate(Bundle)` — or after `onRestart()` when the activity had been stopped, but is now again being displayed to the user.
`void`	`onStop()` Called when you are no longer visible to the user.
`void`	`onTitleChanged(CharSequence title, int color)`
`void`	`onUserLeaveHint()` Called as part of the activity lifecycle when an activity is about to go into the background as the result of user choice.

Inherited methods

From class


  
    android.view.ContextThemeWrapper

`void`	`applyOverrideConfiguration(Configuration overrideConfiguration)` Call to set an "override configuration" on this context -- this is a configuration that replies one or more values of the standard configuration that is applied to the context.
`void`	`attachBaseContext(Context newBase)` Set the base context for this ContextWrapper.
`AssetManager`	`getAssets()` Returns an AssetManager instance for the application's package.
`Resources`	`getResources()` Returns a Resources instance for the application's package.
`Object`	`getSystemService(String name)` Return the handle to a system-level service by name.
`Resources.Theme`	`getTheme()` Return the Theme object associated with this Context.
`void`	`onApplyThemeResource(Resources.Theme theme, int resId, boolean first)` Called by `setTheme(int)` and `getTheme()` to apply a theme resource to the current Theme object.
`void`	`setTheme(int resid)` Set the base theme for this context.

From class


  
    android.content.ContextWrapper

`void`	`attachBaseContext(Context base)` Set the base context for this ContextWrapper.
`boolean`	`bindService(Intent service, ServiceConnection conn, int flags)` Connect to an application service, creating it if needed.
`int`	`checkCallingOrSelfPermission(String permission)` Determine whether the calling process of an IPC or you have been granted a particular permission.
`int`	`checkCallingOrSelfUriPermission(Uri uri, int modeFlags)` Determine whether the calling process of an IPC or you has been granted permission to access a specific URI.
`int`	`checkCallingPermission(String permission)` Determine whether the calling process of an IPC you are handling has been granted a particular permission.
`int`	`checkCallingUriPermission(Uri uri, int modeFlags)` Determine whether the calling process and user ID has been granted permission to access a specific URI.
`int`	`checkPermission(String permission, int pid, int uid)` Determine whether the given permission is allowed for a particular process and user ID running in the system.
`int`	`checkSelfPermission(String permission)` Determine whether you have been granted a particular permission.
`int`	`checkUriPermission(Uri uri, String readPermission, String writePermission, int pid, int uid, int modeFlags)` Check both a Uri and normal permission.
`int`	`checkUriPermission(Uri uri, int pid, int uid, int modeFlags)` Determine whether a particular process and user ID has been granted permission to access a specific URI.
`void`	`clearWallpaper()` This method was deprecated in API level 23. Use `WallpaperManager.clear()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`Context`	`createConfigurationContext(Configuration overrideConfiguration)` Return a new Context object for the current Context but whose resources are adjusted to match the given Configuration.
`Context`	`createDeviceProtectedStorageContext()` Return a new Context object for the current Context but whose storage APIs are backed by device-protected storage.
`Context`	`createDisplayContext(Display display)` Return a new Context object for the current Context but whose resources are adjusted to match the metrics of the given Display.
`Context`	`createPackageContext(String packageName, int flags)` Return a new Context object for the given application name.
`String[]`	`databaseList()` Returns an array of strings naming the private databases associated with this Context's application package.
`boolean`	`deleteDatabase(String name)` Delete an existing private SQLiteDatabase associated with this Context's application package.
`boolean`	`deleteFile(String name)` Delete the given private file associated with this Context's application package.
`boolean`	`deleteSharedPreferences(String name)` Delete an existing shared preferences file.
`void`	`enforceCallingOrSelfPermission(String permission, String message)` If neither you nor the calling process of an IPC you are handling has been granted a particular permission, throw a `SecurityException`.
`void`	`enforceCallingOrSelfUriPermission(Uri uri, int modeFlags, String message)` If the calling process of an IPC or you has not been granted permission to access a specific URI, throw `SecurityException`.
`void`	`enforceCallingPermission(String permission, String message)` If the calling process of an IPC you are handling has not been granted a particular permission, throw a `SecurityException`.
`void`	`enforceCallingUriPermission(Uri uri, int modeFlags, String message)` If the calling process and user ID has not been granted permission to access a specific URI, throw `SecurityException`.
`void`	`enforcePermission(String permission, int pid, int uid, String message)` If the given permission is not allowed for a particular process and user ID running in the system, throw a `SecurityException`.
`void`	`enforceUriPermission(Uri uri, String readPermission, String writePermission, int pid, int uid, int modeFlags, String message)` Enforce both a Uri and normal permission.
`void`	`enforceUriPermission(Uri uri, int pid, int uid, int modeFlags, String message)` If a particular process and user ID has not been granted permission to access a specific URI, throw `SecurityException`.
`String[]`	`fileList()` Returns an array of strings naming the private files associated with this Context's application package.
`Context`	`getApplicationContext()` Return the context of the single, global Application object of the current process.
`ApplicationInfo`	`getApplicationInfo()` Return the full application info for this context's package.
`AssetManager`	`getAssets()` Returns an AssetManager instance for the application's package.
`Context`	`getBaseContext()`
`File`	`getCacheDir()` Returns the absolute path to the application specific cache directory on the filesystem.
`ClassLoader`	`getClassLoader()` Return a class loader you can use to retrieve classes in this package.
`File`	`getCodeCacheDir()` Returns the absolute path to the application specific cache directory on the filesystem designed for storing cached code.
`ContentResolver`	`getContentResolver()` Return a ContentResolver instance for your application's package.
`File`	`getDataDir()` Returns the absolute path to the directory on the filesystem where all private files belonging to this app are stored.
`File`	`getDatabasePath(String name)` Returns the absolute path on the filesystem where a database created with `openOrCreateDatabase(String, int, SQLiteDatabase.CursorFactory)` is stored.
`File`	`getDir(String name, int mode)` Retrieve, creating if needed, a new directory in which the application can place its own custom data files.
`File`	`getExternalCacheDir()` Returns absolute path to application-specific directory on the primary shared/external storage device where the application can place cache files it owns.
`File[]`	`getExternalCacheDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place cache files it owns.
`File`	`getExternalFilesDir(String type)` Returns the absolute path to the directory on the primary shared/external storage device where the application can place persistent files it owns.
`File[]`	`getExternalFilesDirs(String type)` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place persistent files it owns.
`File[]`	`getExternalMediaDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place media files.
`File`	`getFileStreamPath(String name)` Returns the absolute path on the filesystem where a file created with `openFileOutput(String, int)` is stored.
`File`	`getFilesDir()` Returns the absolute path to the directory on the filesystem where files created with `openFileOutput(String, int)` are stored.
`Looper`	`getMainLooper()` Return the Looper for the main thread of the current process.
`File`	`getNoBackupFilesDir()` Returns the absolute path to the directory on the filesystem similar to `getFilesDir()`.
`File`	`getObbDir()` Return the primary shared/external storage directory where this application's OBB files (if there are any) can be found.
`File[]`	`getObbDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application's OBB files (if there are any) can be found.
`String`	`getPackageCodePath()` Return the full path to this context's primary Android package.
`PackageManager`	`getPackageManager()` Return PackageManager instance to find global package information.
`String`	`getPackageName()` Return the name of this application's package.
`String`	`getPackageResourcePath()` Return the full path to this context's primary Android package.
`Resources`	`getResources()` Returns a Resources instance for the application's package.
`SharedPreferences`	`getSharedPreferences(String name, int mode)` Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values.
`Object`	`getSystemService(String name)` Return the handle to a system-level service by name.
`String`	`getSystemServiceName(Class<?> serviceClass)` Gets the name of the system-level service that is represented by the specified class.
`Resources.Theme`	`getTheme()` Return the Theme object associated with this Context.
`Drawable`	`getWallpaper()` This method was deprecated in API level 23. Use `WallpaperManager.get()` instead.
`int`	`getWallpaperDesiredMinimumHeight()` This method was deprecated in API level 23. Use `WallpaperManager.getDesiredMinimumHeight()` instead.
`int`	`getWallpaperDesiredMinimumWidth()` This method was deprecated in API level 23. Use `WallpaperManager.getDesiredMinimumWidth()` instead.
`void`	`grantUriPermission(String toPackage, Uri uri, int modeFlags)` Grant permission to access a specific Uri to another package, regardless of whether that package has general permission to access the Uri's content provider.
`boolean`	`isDeviceProtectedStorage()` Indicates if the storage APIs of this Context are backed by device-protected storage.
`boolean`	`isRestricted()` Indicates whether this Context is restricted.
`boolean`	`moveDatabaseFrom(Context sourceContext, String name)` Move an existing database file from the given source storage context to this context.
`boolean`	`moveSharedPreferencesFrom(Context sourceContext, String name)` Move an existing shared preferences file from the given source storage context to this context.
`FileInputStream`	`openFileInput(String name)` Open a private file associated with this Context's application package for reading.
`FileOutputStream`	`openFileOutput(String name, int mode)` Open a private file associated with this Context's application package for writing.
`SQLiteDatabase`	`openOrCreateDatabase(String name, int mode, SQLiteDatabase.CursorFactory factory, DatabaseErrorHandler errorHandler)` Open a new private SQLiteDatabase associated with this Context's application package.
`SQLiteDatabase`	`openOrCreateDatabase(String name, int mode, SQLiteDatabase.CursorFactory factory)` Open a new private SQLiteDatabase associated with this Context's application package.
`Drawable`	`peekWallpaper()` This method was deprecated in API level 23. Use `WallpaperManager.peek()` instead.
`Intent`	`registerReceiver(BroadcastReceiver receiver, IntentFilter filter)` Register a BroadcastReceiver to be run in the main activity thread.
`Intent`	`registerReceiver(BroadcastReceiver receiver, IntentFilter filter, String broadcastPermission, Handler scheduler)` Register to receive intent broadcasts, to run in the context of `scheduler`.
`void`	`removeStickyBroadcast(Intent intent)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`removeStickyBroadcastAsUser(Intent intent, UserHandle user)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`revokeUriPermission(Uri uri, int modeFlags)` Remove all permissions to access a particular content provider Uri that were previously added with `grantUriPermission(String, Uri, int)`.
`void`	`sendBroadcast(Intent intent, String receiverPermission)` Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced.
`void`	`sendBroadcast(Intent intent)` Broadcast the given intent to all interested BroadcastReceivers.
`void`	`sendBroadcastAsUser(Intent intent, UserHandle user)` Version of `sendBroadcast(Intent)` that allows you to specify the user the broadcast will be sent to.
`void`	`sendBroadcastAsUser(Intent intent, UserHandle user, String receiverPermission)` Version of `sendBroadcast(Intent, String)` that allows you to specify the user the broadcast will be sent to.
`void`	`sendOrderedBroadcast(Intent intent, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` Version of `sendBroadcast(Intent)` that allows you to receive data back from the broadcast.
`void`	`sendOrderedBroadcast(Intent intent, String receiverPermission)` Broadcast the given intent to all interested BroadcastReceivers, delivering them one at a time to allow more preferred receivers to consume the broadcast before it is delivered to less preferred receivers.
`void`	`sendOrderedBroadcastAsUser(Intent intent, UserHandle user, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` Version of `sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle)` that allows you to specify the user the broadcast will be sent to.
`void`	`sendStickyBroadcast(Intent intent)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`sendStickyBroadcastAsUser(Intent intent, UserHandle user)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`sendStickyOrderedBroadcast(Intent intent, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`sendStickyOrderedBroadcastAsUser(Intent intent, UserHandle user, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` This method was deprecated in API level 23. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`void`	`setTheme(int resid)` Set the base theme for this context.
`void`	`setWallpaper(Bitmap bitmap)` This method was deprecated in API level 23. Use `WallpaperManager.set()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`void`	`setWallpaper(InputStream data)` This method was deprecated in API level 23. Use `WallpaperManager.set()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`void`	`startActivities(Intent[] intents, Bundle options)` Launch multiple new activities.
`void`	`startActivities(Intent[] intents)` Same as `startActivities(Intent[], Bundle)` with no options specified.
`void`	`startActivity(Intent intent)` Same as `startActivity(Intent, Bundle)` with no options specified.
`void`	`startActivity(Intent intent, Bundle options)` Launch a new activity.
`boolean`	`startInstrumentation(ComponentName className, String profileFile, Bundle arguments)` Start executing an `Instrumentation` class.
`void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)` Same as `startIntentSender(IntentSender, Intent, int, int, int, Bundle)` with no options specified.
`void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options)` Like `startActivity(Intent, Bundle)`, but taking a IntentSender to start.
`ComponentName`	`startService(Intent service)` Request that a given application service be started.
`boolean`	`stopService(Intent name)` Request that a given application service be stopped.
`void`	`unbindService(ServiceConnection conn)` Disconnect from an application service.
`void`	`unregisterReceiver(BroadcastReceiver receiver)` Unregister a previously registered BroadcastReceiver.

From class


  
    android.content.Context

`abstract boolean`	`bindService(Intent service, ServiceConnection conn, int flags)` Connect to an application service, creating it if needed.
`abstract int`	`checkCallingOrSelfPermission(String permission)` Determine whether the calling process of an IPC or you have been granted a particular permission.
`abstract int`	`checkCallingOrSelfUriPermission(Uri uri, int modeFlags)` Determine whether the calling process of an IPC or you has been granted permission to access a specific URI.
`abstract int`	`checkCallingPermission(String permission)` Determine whether the calling process of an IPC you are handling has been granted a particular permission.
`abstract int`	`checkCallingUriPermission(Uri uri, int modeFlags)` Determine whether the calling process and user ID has been granted permission to access a specific URI.
`abstract int`	`checkPermission(String permission, int pid, int uid)` Determine whether the given permission is allowed for a particular process and user ID running in the system.
`abstract int`	`checkSelfPermission(String permission)` Determine whether you have been granted a particular permission.
`abstract int`	`checkUriPermission(Uri uri, String readPermission, String writePermission, int pid, int uid, int modeFlags)` Check both a Uri and normal permission.
`abstract int`	`checkUriPermission(Uri uri, int pid, int uid, int modeFlags)` Determine whether a particular process and user ID has been granted permission to access a specific URI.
`abstract void`	`clearWallpaper()` This method was deprecated in API level 5. Use `WallpaperManager.clear()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`abstract Context`	`createConfigurationContext(Configuration overrideConfiguration)` Return a new Context object for the current Context but whose resources are adjusted to match the given Configuration.
`abstract Context`	`createDeviceProtectedStorageContext()` Return a new Context object for the current Context but whose storage APIs are backed by device-protected storage.
`abstract Context`	`createDisplayContext(Display display)` Return a new Context object for the current Context but whose resources are adjusted to match the metrics of the given Display.
`abstract Context`	`createPackageContext(String packageName, int flags)` Return a new Context object for the given application name.
`abstract String[]`	`databaseList()` Returns an array of strings naming the private databases associated with this Context's application package.
`abstract boolean`	`deleteDatabase(String name)` Delete an existing private SQLiteDatabase associated with this Context's application package.
`abstract boolean`	`deleteFile(String name)` Delete the given private file associated with this Context's application package.
`abstract boolean`	`deleteSharedPreferences(String name)` Delete an existing shared preferences file.
`abstract void`	`enforceCallingOrSelfPermission(String permission, String message)` If neither you nor the calling process of an IPC you are handling has been granted a particular permission, throw a `SecurityException`.
`abstract void`	`enforceCallingOrSelfUriPermission(Uri uri, int modeFlags, String message)` If the calling process of an IPC or you has not been granted permission to access a specific URI, throw `SecurityException`.
`abstract void`	`enforceCallingPermission(String permission, String message)` If the calling process of an IPC you are handling has not been granted a particular permission, throw a `SecurityException`.
`abstract void`	`enforceCallingUriPermission(Uri uri, int modeFlags, String message)` If the calling process and user ID has not been granted permission to access a specific URI, throw `SecurityException`.
`abstract void`	`enforcePermission(String permission, int pid, int uid, String message)` If the given permission is not allowed for a particular process and user ID running in the system, throw a `SecurityException`.
`abstract void`	`enforceUriPermission(Uri uri, String readPermission, String writePermission, int pid, int uid, int modeFlags, String message)` Enforce both a Uri and normal permission.
`abstract void`	`enforceUriPermission(Uri uri, int pid, int uid, int modeFlags, String message)` If a particular process and user ID has not been granted permission to access a specific URI, throw `SecurityException`.
`abstract String[]`	`fileList()` Returns an array of strings naming the private files associated with this Context's application package.
`abstract Context`	`getApplicationContext()` Return the context of the single, global Application object of the current process.
`abstract ApplicationInfo`	`getApplicationInfo()` Return the full application info for this context's package.
`abstract AssetManager`	`getAssets()` Returns an AssetManager instance for the application's package.
`abstract File`	`getCacheDir()` Returns the absolute path to the application specific cache directory on the filesystem.
`abstract ClassLoader`	`getClassLoader()` Return a class loader you can use to retrieve classes in this package.
`abstract File`	`getCodeCacheDir()` Returns the absolute path to the application specific cache directory on the filesystem designed for storing cached code.
`final int`	`getColor(int id)` Returns a color associated with a particular resource ID and styled for the current theme.
`final ColorStateList`	`getColorStateList(int id)` Returns a color state list associated with a particular resource ID and styled for the current theme.
`abstract ContentResolver`	`getContentResolver()` Return a ContentResolver instance for your application's package.
`abstract File`	`getDataDir()` Returns the absolute path to the directory on the filesystem where all private files belonging to this app are stored.
`abstract File`	`getDatabasePath(String name)` Returns the absolute path on the filesystem where a database created with `openOrCreateDatabase(String, int, SQLiteDatabase.CursorFactory)` is stored.
`abstract File`	`getDir(String name, int mode)` Retrieve, creating if needed, a new directory in which the application can place its own custom data files.
`final Drawable`	`getDrawable(int id)` Returns a drawable object associated with a particular resource ID and styled for the current theme.
`abstract File`	`getExternalCacheDir()` Returns absolute path to application-specific directory on the primary shared/external storage device where the application can place cache files it owns.
`abstract File[]`	`getExternalCacheDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place cache files it owns.
`abstract File`	`getExternalFilesDir(String type)` Returns the absolute path to the directory on the primary shared/external storage device where the application can place persistent files it owns.
`abstract File[]`	`getExternalFilesDirs(String type)` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place persistent files it owns.
`abstract File[]`	`getExternalMediaDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application can place media files.
`abstract File`	`getFileStreamPath(String name)` Returns the absolute path on the filesystem where a file created with `openFileOutput(String, int)` is stored.
`abstract File`	`getFilesDir()` Returns the absolute path to the directory on the filesystem where files created with `openFileOutput(String, int)` are stored.
`abstract Looper`	`getMainLooper()` Return the Looper for the main thread of the current process.
`abstract File`	`getNoBackupFilesDir()` Returns the absolute path to the directory on the filesystem similar to `getFilesDir()`.
`abstract File`	`getObbDir()` Return the primary shared/external storage directory where this application's OBB files (if there are any) can be found.
`abstract File[]`	`getObbDirs()` Returns absolute paths to application-specific directories on all shared/external storage devices where the application's OBB files (if there are any) can be found.
`abstract String`	`getPackageCodePath()` Return the full path to this context's primary Android package.
`abstract PackageManager`	`getPackageManager()` Return PackageManager instance to find global package information.
`abstract String`	`getPackageName()` Return the name of this application's package.
`abstract String`	`getPackageResourcePath()` Return the full path to this context's primary Android package.
`abstract Resources`	`getResources()` Returns a Resources instance for the application's package.
`abstract SharedPreferences`	`getSharedPreferences(String name, int mode)` Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values.
`final String`	`getString(int resId, Object... formatArgs)` Returns a localized formatted string from the application's package's default string table, substituting the format arguments as defined in `Formatter` and `format(String, Object...)`.
`final String`	`getString(int resId)` Returns a localized string from the application's package's default string table.
`final <T> T`	`getSystemService(Class<T> serviceClass)` Return the handle to a system-level service by class.
`abstract Object`	`getSystemService(String name)` Return the handle to a system-level service by name.
`abstract String`	`getSystemServiceName(Class<?> serviceClass)` Gets the name of the system-level service that is represented by the specified class.
`final CharSequence`	`getText(int resId)` Return a localized, styled CharSequence from the application's package's default string table.
`abstract Resources.Theme`	`getTheme()` Return the Theme object associated with this Context.
`abstract Drawable`	`getWallpaper()` This method was deprecated in API level 5. Use `WallpaperManager.get()` instead.
`abstract int`	`getWallpaperDesiredMinimumHeight()` This method was deprecated in API level 5. Use `WallpaperManager.getDesiredMinimumHeight()` instead.
`abstract int`	`getWallpaperDesiredMinimumWidth()` This method was deprecated in API level 5. Use `WallpaperManager.getDesiredMinimumWidth()` instead.
`abstract void`	`grantUriPermission(String toPackage, Uri uri, int modeFlags)` Grant permission to access a specific Uri to another package, regardless of whether that package has general permission to access the Uri's content provider.
`abstract boolean`	`isDeviceProtectedStorage()` Indicates if the storage APIs of this Context are backed by device-protected storage.
`boolean`	`isRestricted()` Indicates whether this Context is restricted.
`abstract boolean`	`moveDatabaseFrom(Context sourceContext, String name)` Move an existing database file from the given source storage context to this context.
`abstract boolean`	`moveSharedPreferencesFrom(Context sourceContext, String name)` Move an existing shared preferences file from the given source storage context to this context.
`final TypedArray`	`obtainStyledAttributes(AttributeSet set, int[] attrs)` Retrieve styled attribute information in this Context's theme.
`final TypedArray`	`obtainStyledAttributes(AttributeSet set, int[] attrs, int defStyleAttr, int defStyleRes)` Retrieve styled attribute information in this Context's theme.
`final TypedArray`	`obtainStyledAttributes(int resid, int[] attrs)` Retrieve styled attribute information in this Context's theme.
`final TypedArray`	`obtainStyledAttributes(int[] attrs)` Retrieve styled attribute information in this Context's theme.
`abstract FileInputStream`	`openFileInput(String name)` Open a private file associated with this Context's application package for reading.
`abstract FileOutputStream`	`openFileOutput(String name, int mode)` Open a private file associated with this Context's application package for writing.
`abstract SQLiteDatabase`	`openOrCreateDatabase(String name, int mode, SQLiteDatabase.CursorFactory factory, DatabaseErrorHandler errorHandler)` Open a new private SQLiteDatabase associated with this Context's application package.
`abstract SQLiteDatabase`	`openOrCreateDatabase(String name, int mode, SQLiteDatabase.CursorFactory factory)` Open a new private SQLiteDatabase associated with this Context's application package.
`abstract Drawable`	`peekWallpaper()` This method was deprecated in API level 5. Use `WallpaperManager.peek()` instead.
`void`	`registerComponentCallbacks(ComponentCallbacks callback)` Add a new `ComponentCallbacks` to the base application of the Context, which will be called at the same times as the ComponentCallbacks methods of activities and other components are called.
`abstract Intent`	`registerReceiver(BroadcastReceiver receiver, IntentFilter filter)` Register a BroadcastReceiver to be run in the main activity thread.
`abstract Intent`	`registerReceiver(BroadcastReceiver receiver, IntentFilter filter, String broadcastPermission, Handler scheduler)` Register to receive intent broadcasts, to run in the context of `scheduler`.
`abstract void`	`removeStickyBroadcast(Intent intent)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`removeStickyBroadcastAsUser(Intent intent, UserHandle user)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`revokeUriPermission(Uri uri, int modeFlags)` Remove all permissions to access a particular content provider Uri that were previously added with `grantUriPermission(String, Uri, int)`.
`abstract void`	`sendBroadcast(Intent intent, String receiverPermission)` Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced.
`abstract void`	`sendBroadcast(Intent intent)` Broadcast the given intent to all interested BroadcastReceivers.
`abstract void`	`sendBroadcastAsUser(Intent intent, UserHandle user)` Version of `sendBroadcast(Intent)` that allows you to specify the user the broadcast will be sent to.
`abstract void`	`sendBroadcastAsUser(Intent intent, UserHandle user, String receiverPermission)` Version of `sendBroadcast(Intent, String)` that allows you to specify the user the broadcast will be sent to.
`abstract void`	`sendOrderedBroadcast(Intent intent, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` Version of `sendBroadcast(Intent)` that allows you to receive data back from the broadcast.
`abstract void`	`sendOrderedBroadcast(Intent intent, String receiverPermission)` Broadcast the given intent to all interested BroadcastReceivers, delivering them one at a time to allow more preferred receivers to consume the broadcast before it is delivered to less preferred receivers.
`abstract void`	`sendOrderedBroadcastAsUser(Intent intent, UserHandle user, String receiverPermission, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` Version of `sendOrderedBroadcast(Intent, String, BroadcastReceiver, Handler, int, String, Bundle)` that allows you to specify the user the broadcast will be sent to.
`abstract void`	`sendStickyBroadcast(Intent intent)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`sendStickyBroadcastAsUser(Intent intent, UserHandle user)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`sendStickyOrderedBroadcast(Intent intent, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`sendStickyOrderedBroadcastAsUser(Intent intent, UserHandle user, BroadcastReceiver resultReceiver, Handler scheduler, int initialCode, String initialData, Bundle initialExtras)` This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.
`abstract void`	`setTheme(int resid)` Set the base theme for this context.
`abstract void`	`setWallpaper(Bitmap bitmap)` This method was deprecated in API level 5. Use `WallpaperManager.set()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`abstract void`	`setWallpaper(InputStream data)` This method was deprecated in API level 5. Use `WallpaperManager.set()` instead. This method requires the caller to hold the permission `SET_WALLPAPER`.
`abstract void`	`startActivities(Intent[] intents, Bundle options)` Launch multiple new activities.
`abstract void`	`startActivities(Intent[] intents)` Same as `startActivities(Intent[], Bundle)` with no options specified.
`abstract void`	`startActivity(Intent intent)` Same as `startActivity(Intent, Bundle)` with no options specified.
`abstract void`	`startActivity(Intent intent, Bundle options)` Launch a new activity.
`abstract boolean`	`startInstrumentation(ComponentName className, String profileFile, Bundle arguments)` Start executing an `Instrumentation` class.
`abstract void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags)` Same as `startIntentSender(IntentSender, Intent, int, int, int, Bundle)` with no options specified.
`abstract void`	`startIntentSender(IntentSender intent, Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options)` Like `startActivity(Intent, Bundle)`, but taking a IntentSender to start.
`abstract ComponentName`	`startService(Intent service)` Request that a given application service be started.
`abstract boolean`	`stopService(Intent service)` Request that a given application service be stopped.
`abstract void`	`unbindService(ServiceConnection conn)` Disconnect from an application service.
`void`	`unregisterComponentCallbacks(ComponentCallbacks callback)` Remove a `ComponentCallbacks` object that was previously registered with `registerComponentCallbacks(ComponentCallbacks)`.
`abstract void`	`unregisterReceiver(BroadcastReceiver receiver)` Unregister a previously registered BroadcastReceiver.

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

From interface


  
    android.view.LayoutInflater.Factory2

From interface


  
    android.view.Window.Callback

From interface


  
    android.view.KeyEvent.Callback

From interface


  
    android.view.View.OnCreateContextMenuListener

From interface


  
    android.content.ComponentCallbacks2

From interface


  
    android.view.LayoutInflater.Factory

From interface


  
    android.content.ComponentCallbacks

Constants

DEFAULT_KEYS_DIALER

Added in API level 1

int DEFAULT_KEYS_DIALER

Use with setDefaultKeyMode(int) to launch the dialer during default key handling.

See also:

setDefaultKeyMode(int)

Constant Value: 1 (0x00000001)

DEFAULT_KEYS_DISABLE

Added in API level 1

int DEFAULT_KEYS_DISABLE

Use with setDefaultKeyMode(int) to turn off default handling of keys.

See also:

setDefaultKeyMode(int)

Constant Value: 0 (0x00000000)

DEFAULT_KEYS_SEARCH_GLOBAL

Added in API level 1

int DEFAULT_KEYS_SEARCH_GLOBAL

Use with setDefaultKeyMode(int) to specify that unhandled keystrokes will start a global search (typically web search, but some platforms may define alternate methods for global search)

See android.app.SearchManager for more details.

See also:

setDefaultKeyMode(int)

Constant Value: 4 (0x00000004)

DEFAULT_KEYS_SEARCH_LOCAL

Added in API level 1

int DEFAULT_KEYS_SEARCH_LOCAL

Use with setDefaultKeyMode(int) to specify that unhandled keystrokes will start an application-defined search. (If the application or activity does not actually define a search, the the keys will be ignored.)

See android.app.SearchManager for more details.

See also:

setDefaultKeyMode(int)

Constant Value: 3 (0x00000003)

DEFAULT_KEYS_SHORTCUT

Added in API level 1

int DEFAULT_KEYS_SHORTCUT

Use with setDefaultKeyMode(int) to execute a menu shortcut in default key handling.

That is, the user does not need to hold down the menu key to execute menu shortcuts.

See also:

setDefaultKeyMode(int)

Constant Value: 2 (0x00000002)

RESULT_CANCELED

Added in API level 1

int RESULT_CANCELED

Standard activity result: operation canceled.

Constant Value: 0 (0x00000000)

RESULT_FIRST_USER

Added in API level 1

int RESULT_FIRST_USER

Start of user-defined activity results.

Constant Value: 1 (0x00000001)

RESULT_OK

Added in API level 1

int RESULT_OK

Standard activity result: operation succeeded.

Constant Value: -1 (0xffffffff)

Fields

FOCUSED_STATE_SET

Added in API level 1

int[] FOCUSED_STATE_SET

Public constructors

Activity

Added in API level 1

Activity ()

Public methods

addContentView

Added in API level 1

void addContentView (View view, 
                ViewGroup.LayoutParams params)

Add an additional content view to the activity. Added after any existing ones in the activity -- existing views are NOT removed.

Parameters
`view`	`View`: The desired content to display.
`params`	`ViewGroup.LayoutParams`: Layout parameters for the view.

closeContextMenu

Added in API level 3

void closeContextMenu ()

Programmatically closes the most recently opened context menu, if showing.

closeOptionsMenu

Added in API level 1

void closeOptionsMenu ()

Progammatically closes the options menu. If the options menu is already closed, this method does nothing.

createPendingResult

Added in API level 1

PendingIntent createPendingResult (int requestCode, 
                Intent data, 
                int flags)

Create a new PendingIntent object which you can hand to others for them to use to send result data back to your onActivityResult(int, int, Intent) callback. The created object will be either one-shot (becoming invalid after a result is sent back) or multiple (allowing any number of results to be sent through it).

Parameters
`requestCode`	`int`: Private request code for the sender that will be associated with the result data when it is returned. The sender can not modify this value, allowing you to identify incoming results.
`data`	`Intent`: Default data to supply in the result, which may be modified by the sender.
`flags`	`int`: May be `PendingIntent.FLAG_ONE_SHOT`, `PendingIntent.FLAG_NO_CREATE`, `PendingIntent.FLAG_CANCEL_CURRENT`, `PendingIntent.FLAG_UPDATE_CURRENT`, or any of the flags as supported by `Intent.fillIn()` to control which unspecified parts of the intent that can be supplied when the actual send happens.

Returns
`PendingIntent`	Returns an existing or new PendingIntent matching the given parameters. May return null only if `PendingIntent.FLAG_NO_CREATE` has been supplied.

See also:

PendingIntent

dismissDialog

Added in API level 1

void dismissDialog (int id)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Dismiss a dialog that was previously shown via showDialog(int).

Parameters
`id`	`int`: The id of the managed dialog.

Throws
`IllegalArgumentException`	if the id was not previously shown via `showDialog(int)`.

See also:

dismissKeyboardShortcutsHelper

Added in API level 24

void dismissKeyboardShortcutsHelper ()

Dismiss the Keyboard Shortcuts screen.

dispatchGenericMotionEvent

Added in API level 12

boolean dispatchGenericMotionEvent (MotionEvent ev)

Called to process generic motion events. You can override this to intercept all generic motion events before they are dispatched to the window. Be sure to call this implementation for generic motion events that should be handled normally.

Parameters
`ev`	`MotionEvent`: The generic motion event.

Returns
`boolean`	boolean Return true if this event was consumed.

dispatchKeyEvent

Added in API level 1

boolean dispatchKeyEvent (KeyEvent event)

Called to process key events. You can override this to intercept all key events before they are dispatched to the window. Be sure to call this implementation for key events that should be handled normally.

Parameters
`event`	`KeyEvent`: The key event.

Returns
`boolean`	boolean Return true if this event was consumed.

dispatchKeyShortcutEvent

Added in API level 11

boolean dispatchKeyShortcutEvent (KeyEvent event)

Called to process a key shortcut event. You can override this to intercept all key shortcut events before they are dispatched to the window. Be sure to call this implementation for key shortcut events that should be handled normally.

Parameters
`event`	`KeyEvent`: The key shortcut event.

Returns
`boolean`	True if this event was consumed.

dispatchPopulateAccessibilityEvent

Added in API level 4

boolean dispatchPopulateAccessibilityEvent (AccessibilityEvent event)

Called to process population of AccessibilityEvents.

Parameters
`event`	`AccessibilityEvent`: The event.

Returns
`boolean`	boolean Return true if event population was completed.

dispatchTouchEvent

Added in API level 1

boolean dispatchTouchEvent (MotionEvent ev)

Called to process touch screen events. You can override this to intercept all touch screen events before they are dispatched to the window. Be sure to call this implementation for touch screen events that should be handled normally.

Parameters
`ev`	`MotionEvent`: The touch screen event.

Returns
`boolean`	boolean Return true if this event was consumed.

dispatchTrackballEvent

Added in API level 1

boolean dispatchTrackballEvent (MotionEvent ev)

Called to process trackball events. You can override this to intercept all trackball events before they are dispatched to the window. Be sure to call this implementation for trackball events that should be handled normally.

Parameters
`ev`	`MotionEvent`: The trackball event.

Returns
`boolean`	boolean Return true if this event was consumed.

dump

Added in API level 11

void dump (String prefix, 
                FileDescriptor fd, 
                PrintWriter writer, 
                String[] args)

Print the Activity's state into the given stream. This gets invoked if you run "adb shell dumpsys activity <activity_component_name>".

Parameters
`prefix`	`String`: Desired prefix to prepend at each line of output.
`fd`	`FileDescriptor`: The raw file descriptor that the dump is being sent to.
`writer`	`PrintWriter`: The PrintWriter to which you should dump your state. This will be closed for you after you return.
`args`	`String`: additional arguments to the dump request.

enterPictureInPictureMode

Added in API level 24

void enterPictureInPictureMode ()

Puts the activity in picture-in-picture mode.

See also:

supportsPictureInPicture

findViewById

Added in API level 1

View findViewById (int id)

Finds a view that was identified by the id attribute from the XML that was processed in onCreate(Bundle).

Parameters
`id`	`int`

Returns
`View`	The view if found or null otherwise.

finish

Added in API level 1

void finish ()

Call this when your activity is done and should be closed. The ActivityResult is propagated back to whoever launched you via onActivityResult().

finishActivity

Added in API level 1

void finishActivity (int requestCode)

Force finish another activity that you had previously started with startActivityForResult(Intent, int).

Parameters
`requestCode`	`int`: The request code of the activity that you had given to startActivityForResult(). If there are multiple activities started with this request code, they will all be finished.

finishActivityFromChild

Added in API level 1

void finishActivityFromChild (Activity child, 
                int requestCode)

This is called when a child activity of this one calls its finishActivity().

Parameters
`child`	`Activity`: The activity making the call.
`requestCode`	`int`: Request code that had been used to start the activity.

finishAffinity

Added in API level 16

void finishAffinity ()

Finish this activity as well as all activities immediately below it in the current task that have the same affinity. This is typically used when an application can be launched on to another task (such as from an ACTION_VIEW of a content type it understands) and the user has used the up navigation to switch out of the current task and in to its own task. In this case, if the user has navigated down into any other activities of the second application, all of those should be removed from the original task as part of the task switch.

Note that this finish does not allow you to deliver results to the previous activity, and an exception will be thrown if you are trying to do so.

finishAfterTransition

Added in API level 21

void finishAfterTransition ()

Reverses the Activity Scene entry Transition and triggers the calling Activity to reverse its exit Transition. When the exit Transition completes, finish() is called. If no entry Transition was used, finish() is called immediately and the Activity exit Transition is run.

See also:

makeSceneTransitionAnimation(Activity, android.util.Pair[])

finishAndRemoveTask

Added in API level 21

void finishAndRemoveTask ()

Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the root activity of the task.

finishFromChild

Added in API level 1

void finishFromChild (Activity child)

This is called when a child activity of this one calls its finish() method. The default implementation simply calls finish() on this activity (the parent), finishing the entire group.

Parameters
`child`	`Activity`: The activity making the call.

See also:

finish()

getActionBar

Added in API level 11

ActionBar getActionBar ()

Retrieve a reference to this activity's ActionBar.

Returns
`ActionBar`	The Activity's ActionBar, or null if it does not have one.

getApplication

Added in API level 1

Application getApplication ()

Return the application that owns this activity.

Returns
`Application`

getCallingActivity

Added in API level 1

ComponentName getCallingActivity ()

Return the name of the activity that invoked this activity. This is who the data in setResult() will be sent to. You can use this information to validate that the recipient is allowed to receive the data.

Note: if the calling activity is not expecting a result (that is it did not use the startActivityForResult(Intent, int) form that includes a request code), then the calling package will be null.

Returns
`ComponentName`	The ComponentName of the activity that will receive your reply, or null if none.

getCallingPackage

Added in API level 1

String getCallingPackage ()

Return the name of the package that invoked this activity. This is who the data in setResult() will be sent to. You can use this information to validate that the recipient is allowed to receive the data.

Note: if the calling activity is not expecting a result (that is it did not use the startActivityForResult(Intent, int) form that includes a request code), then the calling package will be null.

Note: prior to JELLY_BEAN_MR2, the result from this method was unstable. If the process hosting the calling package was no longer running, it would return null instead of the proper package name. You can use getCallingActivity() and retrieve the package name from that instead.

Returns
`String`	The package of the activity that will receive your reply, or null if none.

getChangingConfigurations

Added in API level 1

int getChangingConfigurations ()

If this activity is being destroyed because it can not handle a configuration parameter being changed (and thus its onConfigurationChanged(Configuration) method is not being called), then you can use this method to discover the set of changes that have occurred while in the process of being destroyed. Note that there is no guarantee that these will be accurate (other changes could have happened at any time), so you should only use this as an optimization hint.

Returns
`int`	Returns a bit field of the configuration parameters that are changing, as defined by the `Configuration` class.

getComponentName

Added in API level 1

ComponentName getComponentName ()

Returns complete component name of this activity.

Returns
`ComponentName`	Returns the complete component name for this activity

getContentScene

Added in API level 21

Scene getContentScene ()

Retrieve the Scene representing this window's current content. Requires FEATURE_CONTENT_TRANSITIONS.

This method will return null if the current content is not represented by a Scene.

Returns
`Scene`	Current Scene being shown or null

getContentTransitionManager

Added in API level 21

TransitionManager getContentTransitionManager ()

Retrieve the TransitionManager responsible for default transitions in this window. Requires FEATURE_CONTENT_TRANSITIONS.

This method will return non-null after content has been initialized (e.g. by using setContentView(View)) if FEATURE_CONTENT_TRANSITIONS has been granted.

Returns
`TransitionManager`	This window's content TransitionManager or null if none is set.

getCurrentFocus

Added in API level 1

View getCurrentFocus ()

Calls getCurrentFocus() on the Window of this Activity to return the currently focused view.

Returns
`View`	View The current View with focus or null.

See also:

getWindow()
getCurrentFocus()

getFragmentManager

Added in API level 11

FragmentManager getFragmentManager ()

Return the FragmentManager for interacting with fragments associated with this activity.

Returns
`FragmentManager`

getIntent

Added in API level 1

Intent getIntent ()

Return the intent that started this activity.

Returns
`Intent`

getLastNonConfigurationInstance

Added in API level 1

Object getLastNonConfigurationInstance ()

Retrieve the non-configuration instance data that was previously returned by onRetainNonConfigurationInstance(). This will be available from the initial onCreate(Bundle) and onStart() calls to the new instance, allowing you to extract any useful dynamic state from the previous instance.

Note that the data you retrieve here should only be used as an optimization for handling configuration changes. You should always be able to handle getting a null pointer back, and an activity must still be able to restore itself to its previous state (through the normal onSaveInstanceState(Bundle) mechanism) even if this function returns null.

Note: For most cases you should use the Fragment API setRetainInstance(boolean) instead; this is also available on older platforms through the Android support libraries.

Returns
`Object`	the object previously returned by `onRetainNonConfigurationInstance()`

getLayoutInflater

Added in API level 1

LayoutInflater getLayoutInflater ()

Convenience for calling getLayoutInflater().

Returns
`LayoutInflater`

getLoaderManager

Added in API level 11

LoaderManager getLoaderManager ()

Return the LoaderManager for this activity, creating it if needed.

Returns
`LoaderManager`

getLocalClassName

Added in API level 1

String getLocalClassName ()

Returns class name for this activity with the package prefix removed. This is the default name used to read and write settings.

Returns
`String`	The local class name.

getMediaController

Added in API level 21

MediaController getMediaController ()

Gets the controller which should be receiving media key and volume events while this activity is in the foreground.

Returns
`MediaController`	The controller which should receive events.

See also:

setMediaController(android.media.session.MediaController)

getMenuInflater

Added in API level 1

MenuInflater getMenuInflater ()

Returns a MenuInflater with this context.

Returns
`MenuInflater`

getParent

Added in API level 1

Activity getParent ()

Return the parent activity if this view is an embedded child.

Returns
`Activity`

getParentActivityIntent

Added in API level 16

Intent getParentActivityIntent ()

Obtain an Intent that will launch an explicit target activity specified by this activity's logical parent. The logical parent is named in the application's manifest by the parentActivityName attribute. Activity subclasses may override this method to modify the Intent returned by super.getParentActivityIntent() or to implement a different mechanism of retrieving the parent intent entirely.

Returns
`Intent`	a new Intent targeting the defined parent of this activity or null if there is no valid parent.

getPreferences

Added in API level 1

SharedPreferences getPreferences (int mode)

Retrieve a SharedPreferences object for accessing preferences that are private to this activity. This simply calls the underlying getSharedPreferences(String, int) method by passing in this activity's class name as the preferences name.

Parameters
`mode`	`int`: Operating mode. Use `MODE_PRIVATE` for the default operation.

Returns
`SharedPreferences`	Returns the single SharedPreferences instance that can be used to retrieve and modify the preference values.

getReferrer

Added in API level 22

Uri getReferrer ()

Return information about who launched this activity. If the launching Intent contains an Intent.EXTRA_REFERRER, that will be returned as-is; otherwise, if known, an android-app: referrer URI containing the package name that started the Intent will be returned. This may return null if no referrer can be identified -- it is neither explicitly specified, nor is it known which application package was involved.

If called while inside the handling of onNewIntent(Intent), this function will return the referrer that submitted that new intent to the activity. Otherwise, it always returns the referrer of the original Intent.

Note that this is not a security feature -- you can not trust the referrer information, applications can spoof it.

Returns
`Uri`

getRequestedOrientation

Added in API level 1

int getRequestedOrientation ()

Return the current requested orientation of the activity. This will either be the orientation requested in its component's manifest, or the last requested orientation given to setRequestedOrientation(int).

Returns
`int`	Returns an orientation constant as used in `ActivityInfo.screenOrientation`.

getSearchEvent

Added in API level 23

SearchEvent getSearchEvent ()

During the onSearchRequested() callbacks, this function will return the SearchEvent that triggered the callback, if it exists.

Returns
`SearchEvent`	SearchEvent The SearchEvent that triggered the `onSearchRequested()` callback.

getSystemService

Added in API level 1

Object getSystemService (String name)

Return the handle to a system-level service by name. The class of the returned object varies by the requested name. Currently available names are:

WINDOW_SERVICE ("window"): The top-level window manager in which you can place custom windows. The returned object is a WindowManager.
LAYOUT_INFLATER_SERVICE ("layout_inflater"): A LayoutInflater for inflating layout resources in this context.
ACTIVITY_SERVICE ("activity"): A ActivityManager for interacting with the global activity state of the system.
POWER_SERVICE ("power"): A PowerManager for controlling power management.
ALARM_SERVICE ("alarm"): A AlarmManager for receiving intents at the time of your choosing.
NOTIFICATION_SERVICE ("notification"): A NotificationManager for informing the user of background events.
KEYGUARD_SERVICE ("keyguard"): A KeyguardManager for controlling keyguard.
LOCATION_SERVICE ("location"): A LocationManager for controlling location (e.g., GPS) updates.
SEARCH_SERVICE ("search"): A SearchManager for handling search.
VIBRATOR_SERVICE ("vibrator"): A Vibrator for interacting with the vibrator hardware.
CONNECTIVITY_SERVICE ("connection"): A ConnectivityManager for handling management of network connections.
WIFI_SERVICE ("wifi"): A WifiManager for management of Wi-Fi connectivity.
WIFI_P2P_SERVICE ("wifip2p"): A WifiP2pManager for management of Wi-Fi Direct connectivity.
INPUT_METHOD_SERVICE ("input_method"): An InputMethodManager for management of input methods.
UI_MODE_SERVICE ("uimode"): An UiModeManager for controlling UI modes.
DOWNLOAD_SERVICE ("download"): A DownloadManager for requesting HTTP downloads
BATTERY_SERVICE ("batterymanager"): A BatteryManager for managing battery state
JOB_SCHEDULER_SERVICE ("taskmanager"): A JobScheduler for managing scheduled tasks
NETWORK_STATS_SERVICE ("netstats"): A NetworkStatsManager for querying network usage statistics.
HARDWARE_PROPERTIES_SERVICE ("hardware_properties"): A HardwarePropertiesManager for accessing hardware properties.

Note: System services obtained via this API may be closely associated with the Context in which they are obtained from. In general, do not share the service objects between various different contexts (Activities, Applications, Services, Providers, etc.)

Parameters
`name`	`String`: The name of the desired service.

Returns
`Object`	The service or null if the name does not exist.

getTaskId

Added in API level 1

int getTaskId ()

Return the identifier of the task this activity is in. This identifier will remain the same for the lifetime of the activity.

Returns
`int`	Task identifier, an opaque integer.

getTitle

Added in API level 1

CharSequence getTitle ()

Returns
`CharSequence`

getTitleColor

Added in API level 1

int getTitleColor ()

Returns
`int`

getVoiceInteractor

Added in API level 23

VoiceInteractor getVoiceInteractor ()

Retrieve the active VoiceInteractor that the user is going through to interact with this activity.

Returns
`VoiceInteractor`

getVolumeControlStream

Added in API level 1

int getVolumeControlStream ()

Gets the suggested audio stream whose volume should be changed by the hardware volume controls.

Returns
`int`	The suggested audio stream type whose volume should be changed by the hardware volume controls.

See also:

setVolumeControlStream(int)

getWindow

Added in API level 1

Window getWindow ()

Retrieve the current Window for the activity. This can be used to directly access parts of the Window API that are not available through Activity/Screen.

Returns
`Window`	Window The current window, or null if the activity is not visual.

getWindowManager

Added in API level 1

WindowManager getWindowManager ()

Retrieve the window manager for showing custom windows.

Returns
`WindowManager`

hasWindowFocus

Added in API level 3

boolean hasWindowFocus ()

Returns true if this activity's main window currently has window focus. Note that this is not the same as the view itself having focus.

Returns
`boolean`	True if this activity's main window currently has window focus.

See also:

onWindowAttributesChanged(android.view.WindowManager.LayoutParams)

invalidateOptionsMenu

Added in API level 11

void invalidateOptionsMenu ()

Declare that the options menu has changed, so should be recreated. The onCreateOptionsMenu(Menu) method will be called the next time it needs to be displayed.

isChangingConfigurations

Added in API level 11

boolean isChangingConfigurations ()

Check to see whether this activity is in the process of being destroyed in order to be recreated with a new configuration. This is often used in onStop() to determine whether the state needs to be cleaned up or will be passed on to the next instance of the activity via onRetainNonConfigurationInstance().

Returns
`boolean`	If the activity is being torn down in order to be recreated with a new configuration, returns true; else returns false.

isChild

Added in API level 1

boolean isChild ()

Is this activity embedded inside of another activity?

Returns
`boolean`

isDestroyed

Added in API level 17

boolean isDestroyed ()

Returns true if the final onDestroy() call has been made on the Activity, so this instance is now dead.

Returns
`boolean`

isFinishing

Added in API level 1

boolean isFinishing ()

Check to see whether this activity is in the process of finishing, either because you called finish() on it or someone else has requested that it finished. This is often used in onPause() to determine whether the activity is simply pausing or completely finishing.

Returns
`boolean`	If the activity is finishing, returns true; else returns false.

See also:

finish()

isImmersive

Added in API level 18

boolean isImmersive ()

Bit indicating that this activity is "immersive" and should not be interrupted by notifications if possible. This value is initially set by the manifest property android:immersive but may be changed at runtime by setImmersive(boolean).

Returns
`boolean`

See also:

isInMultiWindowMode

Added in API level 24

boolean isInMultiWindowMode ()

Returns true if the activity is currently in multi-window mode.

Returns
`boolean`	True if the activity is in multi-window mode.

See also:

resizeableActivity

isInPictureInPictureMode

Added in API level 24

boolean isInPictureInPictureMode ()

Returns true if the activity is currently in picture-in-picture mode.

Returns
`boolean`	True if the activity is in picture-in-picture mode.

See also:

supportsPictureInPicture

isLocalVoiceInteractionSupported

Added in API level 24

boolean isLocalVoiceInteractionSupported ()

Queries whether the currently enabled voice interaction service supports returning a voice interactor for use by the activity. This is valid only for the duration of the activity.

Returns
`boolean`	whether the current voice interaction service supports local voice interaction

isTaskRoot

Added in API level 1

boolean isTaskRoot ()

Return whether this activity is the root of a task. The root is the first activity in a task.

Returns
`boolean`	True if this is the root activity, else false.

isVoiceInteraction

Added in API level 23

boolean isVoiceInteraction ()

Check whether this activity is running as part of a voice interaction with the user. If true, it should perform its interaction with the user through the VoiceInteractor returned by getVoiceInteractor().

Returns
`boolean`

isVoiceInteractionRoot

Added in API level 23

boolean isVoiceInteractionRoot ()

Like isVoiceInteraction(), but only returns true if this is also the root of a voice interaction. That is, returns true if this activity was directly started by the voice interaction service as the initiation of a voice interaction. Otherwise, for example if it was started by another activity while under voice interaction, returns false.

Returns
`boolean`

managedQuery

Added in API level 1

Cursor managedQuery (Uri uri, 
                String[] projection, 
                String selection, 
                String[] selectionArgs, 
                String sortOrder)

This method was deprecated in API level 11.
Use CursorLoader instead.

Wrapper around query(android.net.Uri, String[], String, String[], String) that gives the resulting Cursor to call startManagingCursor(Cursor) so that the activity will manage its lifecycle for you. If you are targeting HONEYCOMB or later, consider instead using LoaderManager instead, available via getLoaderManager().

Warning: Do not call close() on a cursor obtained using this method, because the activity will do that for you at the appropriate time. However, if you call stopManagingCursor(Cursor) on a cursor from a managed query, the system will not automatically close the cursor and, in that case, you must call close().

Parameters
`uri`	`Uri`: The URI of the content provider to query.
`projection`	`String`: List of columns to return.
`selection`	`String`: SQL WHERE clause.
`selectionArgs`	`String`: The arguments to selection, if any ?s are pesent
`sortOrder`	`String`: SQL ORDER BY clause.

Returns
`Cursor`	The Cursor that was returned by query().

See also:

moveTaskToBack

Added in API level 1

boolean moveTaskToBack (boolean nonRoot)

Move the task containing this activity to the back of the activity stack. The activity's order within the task is unchanged.

Parameters
`nonRoot`	`boolean`: If false then this only works if the activity is the root of a task; if true it will work for any activity in a task.

Returns
`boolean`	If the task was moved (or it was already at the back) true is returned, else false.

navigateUpTo

Added in API level 16

boolean navigateUpTo (Intent upIntent)

Navigate from this activity to the activity specified by upIntent, finishing this activity in the process. If the activity indicated by upIntent already exists in the task's history, this activity and all others before the indicated activity in the history stack will be finished.

If the indicated activity does not appear in the history stack, this will finish each activity in this task until the root activity of the task is reached, resulting in an "in-app home" behavior. This can be useful in apps with a complex navigation hierarchy when an activity may be reached by a path not passing through a canonical parent activity.

This method should be used when performing up navigation from within the same task as the destination. If up navigation should cross tasks in some cases, see shouldUpRecreateTask(Intent).

Parameters
`upIntent`	`Intent`: An intent representing the target destination for up navigation

Returns
`boolean`	true if up navigation successfully reached the activity indicated by upIntent and upIntent was delivered to it. false if an instance of the indicated activity could not be found and this activity was simply finished normally.

navigateUpToFromChild

Added in API level 16

boolean navigateUpToFromChild (Activity child, 
                Intent upIntent)

This is called when a child activity of this one calls its navigateUpTo(Intent) method. The default implementation simply calls navigateUpTo(upIntent) on this activity (the parent).

Parameters
`child`	`Activity`: The activity making the call.
`upIntent`	`Intent`: An intent representing the target destination for up navigation

Returns
`boolean`	true if up navigation successfully reached the activity indicated by upIntent and upIntent was delivered to it. false if an instance of the indicated activity could not be found and this activity was simply finished normally.

onActionModeFinished

Added in API level 11

void onActionModeFinished (ActionMode mode)

Notifies the activity that an action mode has finished. Activity subclasses overriding this method should call the superclass implementation.

Parameters
`mode`	`ActionMode`: The action mode that just finished.

onActionModeStarted

Added in API level 11

void onActionModeStarted (ActionMode mode)

Notifies the Activity that an action mode has been started. Activity subclasses overriding this method should call the superclass implementation.

Parameters
`mode`	`ActionMode`: The new action mode.

onActivityReenter

Added in API level 21

void onActivityReenter (int resultCode, 
                Intent data)

Called when an activity you launched with an activity transition exposes this Activity through a returning activity transition, giving you the resultCode and any additional data from it. This method will only be called if the activity set a result code other than RESULT_CANCELED and it supports activity transitions with FEATURE_ACTIVITY_TRANSITIONS.

The purpose of this function is to let the called Activity send a hint about its state so that this underlying Activity can prepare to be exposed. A call to this method does not guarantee that the called Activity has or will be exiting soon. It only indicates that it will expose this Activity's Window and it has some data to pass to prepare it.

Parameters
`resultCode`	`int`: The integer result code returned by the child activity through its setResult().
`data`	`Intent`: An Intent, which can return result data to the caller (various data can be attached to Intent "extras").

onAttachFragment

Added in API level 11

void onAttachFragment (Fragment fragment)

Called when a Fragment is being attached to this activity, immediately after the call to its Fragment.onAttach() method and before Fragment.onCreate().

Parameters
`fragment`	`Fragment`

onAttachedToWindow

Added in API level 5

void onAttachedToWindow ()

Called when the main window associated with the activity has been attached to the window manager. See View.onAttachedToWindow() for more information.

See also:

onAttachedToWindow()

onBackPressed

Added in API level 5

void onBackPressed ()

Called when the activity has detected the user's press of the back key. The default implementation simply finishes the current activity, but you can override this to do whatever you want.

onConfigurationChanged

Added in API level 1

void onConfigurationChanged (Configuration newConfig)

Called by the system when the device configuration changes while your activity is running. Note that this will only be called if you have selected configurations you would like to handle with the configChanges attribute in your manifest. If any configuration change occurs that is not selected to be reported by that attribute, then instead of reporting it the system will stop and restart the activity (to have it launched with the new configuration).

At the time that this function has been called, your Resources object will have been updated to return resource values matching the new configuration.

Parameters
`newConfig`	`Configuration`: The new device configuration.

onContentChanged

Added in API level 1

void onContentChanged ()

This hook is called whenever the content view of the screen changes (due to a call to Window.setContentView or Window.addContentView).

onContextItemSelected

Added in API level 1

boolean onContextItemSelected (MenuItem item)

This hook is called whenever an item in a context menu is selected. The default implementation simply returns false to have the normal processing happen (calling the item's Runnable or sending a message to its Handler as appropriate). You can use this method for any items for which you would like to do processing without those other facilities.

Use getMenuInfo() to get extra information set by the View that added this menu item.

Derived classes should call through to the base class for it to perform the default menu handling.

Parameters
`item`	`MenuItem`: The context menu item that was selected.

Returns
`boolean`	boolean Return false to allow normal context menu processing to proceed, true to consume it here.

onContextMenuClosed

Added in API level 1

void onContextMenuClosed (Menu menu)

This hook is called whenever the context menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).

Parameters
`menu`	`Menu`: The context menu that is being closed.

onCreate

Added in API level 21

void onCreate (Bundle savedInstanceState, 
                PersistableBundle persistentState)

Same as onCreate(android.os.Bundle) but called for those activities created with the attribute persistableMode set to persistAcrossReboots.

Parameters
`savedInstanceState`	`Bundle`: if the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in `onSaveInstanceState(Bundle)`. *Note: Otherwise it is null.*
`persistentState`	`PersistableBundle`: if the activity is being re-initialized after previously being shut down or powered off then this Bundle contains the data it most recently supplied to outPersistentState in `onSaveInstanceState(Bundle)`. *Note: Otherwise it is null.*

See also:

onCreateContextMenu

Added in API level 1

void onCreateContextMenu (ContextMenu menu, 
                View v, 
                ContextMenu.ContextMenuInfo menuInfo)

Called when a context menu for the view is about to be shown. Unlike onCreateOptionsMenu(Menu), this will be called every time the context menu is about to be shown and should be populated for the view (or item inside the view for AdapterView subclasses, this can be found in the menuInfo)).

Use onContextItemSelected(android.view.MenuItem) to know when an item has been selected.

It is not safe to hold onto the context menu after this method returns.

Parameters
`menu`	`ContextMenu`: The context menu that is being built
`v`	`View`: The view for which the context menu is being built
`menuInfo`	`ContextMenu.ContextMenuInfo`: Extra information about the item for which the context menu should be shown. This information will vary depending on the class of v.

onCreateDescription

Added in API level 1

CharSequence onCreateDescription ()

Generate a new description for this activity. This method is called before pausing the activity and can, if desired, return some textual description of its current state to be displayed to the user.

The default implementation returns null, which will cause you to inherit the description from the previous activity. If all activities return null, generally the label of the top activity will be used as the description.

Returns
`CharSequence`	A description of what the user is doing. It should be short and sweet (only a few words).

See also:

onCreateNavigateUpTaskStack

Added in API level 16

void onCreateNavigateUpTaskStack (TaskStackBuilder builder)

Define the synthetic task stack that will be generated during Up navigation from a different task.

The default implementation of this method adds the parent chain of this activity as specified in the manifest to the supplied TaskStackBuilder. Applications may choose to override this method to construct the desired task stack in a different way.

This method will be invoked by the default implementation of onNavigateUp() if shouldUpRecreateTask(Intent) returns true when supplied with the intent returned by getParentActivityIntent().

Applications that wish to supply extra Intent parameters to the parent stack defined by the manifest should override onPrepareNavigateUpTaskStack(TaskStackBuilder).

Parameters
`builder`	`TaskStackBuilder`: An empty TaskStackBuilder - the application should add intents representing the desired task stack

onCreateOptionsMenu

Added in API level 1

boolean onCreateOptionsMenu (Menu menu)

Initialize the contents of the Activity's standard options menu. You should place your menu items in to menu.

This is only called once, the first time the options menu is displayed. To update the menu every time it is displayed, see onPrepareOptionsMenu(Menu).

The default implementation populates the menu with standard system menu items. These are placed in the CATEGORY_SYSTEM group so that they will be correctly ordered with application-defined menu items. Deriving classes should always call through to the base implementation.

You can safely hold on to menu (and any items created from it), making modifications to it as desired, until the next time onCreateOptionsMenu() is called.

When you add items to the menu, you can implement the Activity's onOptionsItemSelected(MenuItem) method to handle them there.

Parameters
`menu`	`Menu`: The options menu in which you place your items.

Returns
`boolean`	You must return true for the menu to be displayed; if you return false it will not be shown.

See also:

onCreatePanelMenu

Added in API level 1

boolean onCreatePanelMenu (int featureId, 
                Menu menu)

Default implementation of onCreatePanelMenu(int, Menu) for activities. This calls through to the new onCreateOptionsMenu(Menu) method for the FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
`featureId`	`int`: The panel being created.
`menu`	`Menu`: The menu inside the panel.

Returns
`boolean`	boolean You must return true for the panel to be displayed; if you return false it will not be shown.

onCreatePanelView

Added in API level 1

View onCreatePanelView (int featureId)

Default implementation of onCreatePanelView(int) for activities. This simply returns null so that all panel sub-windows will have the default menu behavior.

Parameters
`featureId`	`int`: Which panel is being created.

Returns
`View`	view The top-level view to place in the panel.

onCreateThumbnail

Added in API level 1

boolean onCreateThumbnail (Bitmap outBitmap, 
                Canvas canvas)

Generate a new thumbnail for this activity. This method is called before pausing the activity, and should draw into outBitmap the imagery for the desired thumbnail in the dimensions of that bitmap. It can use the given canvas, which is configured to draw into the bitmap, for rendering if desired.

The default implementation returns fails and does not draw a thumbnail; this will result in the platform creating its own thumbnail if needed.

Parameters
`outBitmap`	`Bitmap`: The bitmap to contain the thumbnail.
`canvas`	`Canvas`: Can be used to render into the bitmap.

Returns
`boolean`	Return true if you have drawn into the bitmap; otherwise after you return it will be filled with a default thumbnail.

See also:

onCreateView

Added in API level 11

View onCreateView (View parent, 
                String name, 
                Context context, 
                AttributeSet attrs)

Standard implementation of onCreateView(View, String, Context, AttributeSet) used when inflating with the LayoutInflater returned by getSystemService(Class). This implementation handles tags to embed fragments inside of the activity.

Parameters
`parent`	`View`: The parent that the created view will be placed in; note that this may be null.
`name`	`String`: Tag name to be inflated.
`context`	`Context`: The context the view is being created in.
`attrs`	`AttributeSet`: Inflation attributes as specified in XML file.

Returns
`View`	View Newly created view. Return null for the default behavior.

See also:

onCreateView

Added in API level 1

View onCreateView (String name, 
                Context context, 
                AttributeSet attrs)

Standard implementation of onCreateView(String, Context, AttributeSet) used when inflating with the LayoutInflater returned by getSystemService(Class). This implementation does nothing and is for pre-HONEYCOMB apps. Newer apps should use onCreateView(View, String, Context, AttributeSet).

Parameters
`name`	`String`: Tag name to be inflated.
`context`	`Context`: The context the view is being created in.
`attrs`	`AttributeSet`: Inflation attributes as specified in XML file.

Returns
`View`	View Newly created view. Return null for the default behavior.

See also:

onDetachedFromWindow

Added in API level 5

void onDetachedFromWindow ()

Called when the main window associated with the activity has been detached from the window manager. See View.onDetachedFromWindow() for more information.

See also:

onDetachedFromWindow()

onEnterAnimationComplete

Added in API level 21

void onEnterAnimationComplete ()

Activities cannot draw during the period that their windows are animating in. In order to know when it is safe to begin drawing they can override this method which will be called when the entering animation has completed.

onGenericMotionEvent

Added in API level 12

boolean onGenericMotionEvent (MotionEvent event)

Called when a generic motion event was not handled by any of the views inside of the activity.

Generic motion events describe joystick movements, mouse hovers, track pad touches, scroll wheel movements and other input events. The source of the motion event specifies the class of input that was received. Implementations of this method must examine the bits in the source before processing the event. The following code example shows how this is done.

Generic motion events with source class SOURCE_CLASS_POINTER are delivered to the view under the pointer. All other generic motion events are delivered to the focused view.

See onGenericMotionEvent(MotionEvent) for an example of how to handle this event.

Parameters
`event`	`MotionEvent`: The generic motion event being processed.

Returns
`boolean`	Return true if you have consumed the event, false if you haven't. The default implementation always returns false.

onKeyDown

Added in API level 1

boolean onKeyDown (int keyCode, 
                KeyEvent event)

Called when a key was pressed down and not handled by any of the views inside of the activity. So, for example, key presses while the cursor is inside a TextView will not trigger the event (unless it is a navigation to another object) because TextView handles its own key presses.

If the focused view didn't want this event, this method is called.

The default implementation takes care of KEYCODE_BACK by calling onBackPressed(), though the behavior varies based on the application compatibility mode: for ECLAIR or later applications, it will set up the dispatch to call onKeyUp(int, KeyEvent) where the action will be performed; for earlier applications, it will perform the action immediately in on-down, as those versions of the platform behaved.

Other additional default key handling may be performed if configured with setDefaultKeyMode(int).

Parameters
`keyCode`	`int`: The value in event.getKeyCode().
`event`	`KeyEvent`: Description of the key event.

Returns
`boolean`	Return `true` to prevent this event from being propagated further, or `false` to indicate that you have not handled this event and it should continue to be propagated.

See also:

onKeyLongPress

Added in API level 5

boolean onKeyLongPress (int keyCode, 
                KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyLongPress(): always returns false (doesn't handle the event).

Parameters
`keyCode`	`int`: The value in event.getKeyCode().
`event`	`KeyEvent`: Description of the key event.

Returns
`boolean`	If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

onKeyMultiple

Added in API level 1

boolean onKeyMultiple (int keyCode, 
                int repeatCount, 
                KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyMultiple(): always returns false (doesn't handle the event).

Parameters
`keyCode`	`int`: The value in event.getKeyCode().
`repeatCount`	`int`: Number of pairs as returned by event.getRepeatCount().
`event`	`KeyEvent`: Description of the key event.

Returns
`boolean`	If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

onKeyShortcut

Added in API level 11

boolean onKeyShortcut (int keyCode, 
                KeyEvent event)

Called when a key shortcut event is not handled by any of the views in the Activity. Override this method to implement global key shortcuts for the Activity. Key shortcuts can also be implemented by setting the shortcut property of menu items.

Parameters
`keyCode`	`int`: The value in event.getKeyCode().
`event`	`KeyEvent`: Description of the key event.

Returns
`boolean`	True if the key shortcut was handled.

onKeyUp

Added in API level 1

boolean onKeyUp (int keyCode, 
                KeyEvent event)

Called when a key was released and not handled by any of the views inside of the activity. So, for example, key presses while the cursor is inside a TextView will not trigger the event (unless it is a navigation to another object) because TextView handles its own key presses.

The default implementation handles KEYCODE_BACK to stop the activity and go back.

Parameters
`keyCode`	`int`: The value in event.getKeyCode().
`event`	`KeyEvent`: Description of the key event.

Returns
`boolean`	Return `true` to prevent this event from being propagated further, or `false` to indicate that you have not handled this event and it should continue to be propagated.

See also:

onLocalVoiceInteractionStarted

Added in API level 24

void onLocalVoiceInteractionStarted ()

Callback to indicate that startLocalVoiceInteraction(Bundle) has resulted in a voice interaction session being started. You can now retrieve a voice interactor using getVoiceInteractor().

onLocalVoiceInteractionStopped

Added in API level 24

void onLocalVoiceInteractionStopped ()

Callback to indicate that the local voice interaction has stopped either because it was requested through a call to stopLocalVoiceInteraction() or because it was canceled by the user. The previously acquired VoiceInteractor is no longer valid after this.

onLowMemory

Added in API level 1

void onLowMemory ()

This is called when the overall system is running low on memory, and actively running processes should trim their memory usage. While the exact point at which this will be called is not defined, generally it will happen when all background process have been killed. That is, before reaching the point of killing processes hosting service and foreground UI that we would like to avoid killing.

You should implement this method to release any caches or other unnecessary resources you may be holding on to. The system will perform a garbage collection for you after returning from this method.

Preferably, you should implement onTrimMemory(int) from ComponentCallbacks2 to incrementally unload your resources based on various levels of memory demands. That API is available for API level 14 and higher, so you should only use this onLowMemory() method as a fallback for older versions, which can be treated the same as onTrimMemory(int) with the TRIM_MEMORY_COMPLETE level.

onMenuItemSelected

Added in API level 1

boolean onMenuItemSelected (int featureId, 
                MenuItem item)

Default implementation of onMenuItemSelected(int, MenuItem) for activities. This calls through to the new onOptionsItemSelected(MenuItem) method for the FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
`featureId`	`int`: The panel that the menu is in.
`item`	`MenuItem`: The menu item that was selected.

Returns
`boolean`	boolean Return true to finish processing of selection, or false to perform the normal menu handling (calling its Runnable or sending a Message to its target Handler).

onMenuOpened

Added in API level 1

boolean onMenuOpened (int featureId, 
                Menu menu)

Called when a panel's menu is opened by the user. This may also be called when the menu is changing from one type to another (for example, from the icon menu to the expanded menu).

Parameters
`featureId`	`int`: The panel that the menu is in.
`menu`	`Menu`: The menu that is opened.

Returns
`boolean`	The default implementation returns true.

onMultiWindowModeChanged

Added in API level 24

void onMultiWindowModeChanged (boolean isInMultiWindowMode)

Called by the system when the activity changes from fullscreen mode to multi-window mode and visa-versa.

Parameters
`isInMultiWindowMode`	`boolean`: True if the activity is in multi-window mode.

See also:

resizeableActivity

onNavigateUp

Added in API level 16

boolean onNavigateUp ()

This method is called whenever the user chooses to navigate Up within your application's activity hierarchy from the action bar.

If the attribute parentActivityName was specified in the manifest for this activity or an activity-alias to it, default Up navigation will be handled automatically. If any activity along the parent chain requires extra Intent arguments, the Activity subclass should override the method onPrepareNavigateUpTaskStack(TaskStackBuilder) to supply those arguments.

See Tasks and Back Stack from the developer guide and Navigation from the design guide for more information about navigating within your app.

See the TaskStackBuilder class and the Activity methods getParentActivityIntent(), shouldUpRecreateTask(Intent), and navigateUpTo(Intent) for help implementing custom Up navigation. The AppNavigation sample application in the Android SDK is also available for reference.

Returns
`boolean`	true if Up navigation completed successfully and this Activity was finished, false otherwise.

onNavigateUpFromChild

Added in API level 16

boolean onNavigateUpFromChild (Activity child)

This is called when a child activity of this one attempts to navigate up. The default implementation simply calls onNavigateUp() on this activity (the parent).

Parameters
`child`	`Activity`: The activity making the call.

Returns
`boolean`

onOptionsItemSelected

Added in API level 1

boolean onOptionsItemSelected (MenuItem item)

This hook is called whenever an item in your options menu is selected. The default implementation simply returns false to have the normal processing happen (calling the item's Runnable or sending a message to its Handler as appropriate). You can use this method for any items for which you would like to do processing without those other facilities.

Derived classes should call through to the base class for it to perform the default menu handling.

Parameters
`item`	`MenuItem`: The menu item that was selected.

Returns
`boolean`	boolean Return false to allow normal menu processing to proceed, true to consume it here.

See also:

onCreateOptionsMenu(Menu)

onOptionsMenuClosed

Added in API level 1

void onOptionsMenuClosed (Menu menu)

This hook is called whenever the options menu is being closed (either by the user canceling the menu with the back/menu button, or when an item is selected).

Parameters
`menu`	`Menu`: The options menu as last shown or first initialized by onCreateOptionsMenu().

onPanelClosed

Added in API level 1

void onPanelClosed (int featureId, 
                Menu menu)

Default implementation of onPanelClosed(int, Menu) for activities. This calls through to onOptionsMenuClosed(Menu) method for the FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes. For context menus (FEATURE_CONTEXT_MENU), the onContextMenuClosed(Menu) will be called.

Parameters
`featureId`	`int`: The panel that is being displayed.
`menu`	`Menu`: If onCreatePanelView() returned null, this is the Menu being displayed in the panel.

onPictureInPictureModeChanged

Added in API level 24

void onPictureInPictureModeChanged (boolean isInPictureInPictureMode)

Called by the system when the activity changes to and from picture-in-picture mode.

Parameters
`isInPictureInPictureMode`	`boolean`: True if the activity is in picture-in-picture mode.

See also:

supportsPictureInPicture

onPostCreate

Added in API level 21

void onPostCreate (Bundle savedInstanceState, 
                PersistableBundle persistentState)

This is the same as onPostCreate(Bundle) but is called for activities created with the attribute persistableMode set to persistAcrossReboots.

Parameters
`savedInstanceState`	`Bundle`: The data most recently supplied in `onSaveInstanceState(Bundle)`
`persistentState`	`PersistableBundle`: The data caming from the PersistableBundle first saved in `onSaveInstanceState(Bundle, PersistableBundle)`.

See also:

onCreate(Bundle)

onPrepareNavigateUpTaskStack

Added in API level 16

void onPrepareNavigateUpTaskStack (TaskStackBuilder builder)

Prepare the synthetic task stack that will be generated during Up navigation from a different task.

This method receives the TaskStackBuilder with the constructed series of Intents as generated by onCreateNavigateUpTaskStack(TaskStackBuilder). If any extra data should be added to these intents before launching the new task, the application should override this method and add that data here.

Parameters
`builder`	`TaskStackBuilder`: A TaskStackBuilder that has been populated with Intents by onCreateNavigateUpTaskStack.

onPrepareOptionsMenu

Added in API level 1

boolean onPrepareOptionsMenu (Menu menu)

Prepare the Screen's standard options menu to be displayed. This is called right before the menu is shown, every time it is shown. You can use this method to efficiently enable/disable items or otherwise dynamically modify the contents.

The default implementation updates the system menu items based on the activity's state. Deriving classes should always call through to the base class implementation.

Parameters
`menu`	`Menu`: The options menu as last shown or first initialized by onCreateOptionsMenu().

Returns
`boolean`	You must return true for the menu to be displayed; if you return false it will not be shown.

See also:

onCreateOptionsMenu(Menu)

onPreparePanel

Added in API level 1

boolean onPreparePanel (int featureId, 
                View view, 
                Menu menu)

Default implementation of onPreparePanel(int, View, Menu) for activities. This calls through to the new onPrepareOptionsMenu(Menu) method for the FEATURE_OPTIONS_PANEL panel, so that subclasses of Activity don't need to deal with feature codes.

Parameters
`featureId`	`int`: The panel that is being displayed.
`view`	`View`: The View that was returned by onCreatePanelView().
`menu`	`Menu`: If onCreatePanelView() returned null, this is the Menu being displayed in the panel.

Returns
`boolean`	boolean You must return true for the panel to be displayed; if you return false it will not be shown.

onProvideAssistContent

Added in API level 23

void onProvideAssistContent (AssistContent outContent)

This is called when the user is requesting an assist, to provide references to content related to the current activity. Before being called, the outContent Intent is filled with the base Intent of the activity (the Intent returned by getIntent()). The Intent's extras are stripped of any types that are not valid for PersistableBundle or non-framework Parcelables, and the flags FLAG_GRANT_WRITE_URI_PERMISSION and FLAG_GRANT_PERSISTABLE_URI_PERMISSION are cleared from the Intent.

Custom implementation may adjust the content intent to better reflect the top-level context of the activity, and fill in its ClipData with additional content of interest that the user is currently viewing. For example, an image gallery application that has launched in to an activity allowing the user to swipe through pictures should modify the intent to reference the current image they are looking it; such an application when showing a list of pictures should add a ClipData that has references to all of the pictures currently visible on screen.

Parameters
`outContent`	`AssistContent`: The assist content to return.

onProvideAssistData

Added in API level 18

void onProvideAssistData (Bundle data)

This is called when the user is requesting an assist, to build a full ACTION_ASSIST Intent with all of the context of the current application. You can override this method to place into the bundle anything you would like to appear in the EXTRA_ASSIST_CONTEXT part of the assist Intent.

This function will be called after any global assist callbacks that had been registered with Application.registerOnProvideAssistDataListener.

Parameters
`data`	`Bundle`

onProvideKeyboardShortcuts

void onProvideKeyboardShortcuts (List<KeyboardShortcutGroup> data, 
                Menu menu, 
                int deviceId)

Called when Keyboard Shortcuts are requested for the current window.

Parameters
`data`	`List`: The data list to populate with shortcuts.
`menu`	`Menu`: The current menu, which may be null.
`deviceId`	`int`: The id for the connected device the shortcuts should be provided for.

onProvideReferrer

Added in API level 23

Uri onProvideReferrer ()

Override to generate the desired referrer for the content currently being shown by the app. The default implementation returns null, meaning the referrer will simply be the android-app: of the package name of this activity. Return a non-null Uri to have that supplied as the EXTRA_REFERRER of any activities started from it.

Returns
`Uri`

onRequestPermissionsResult

Added in API level 23

void onRequestPermissionsResult (int requestCode, 
                String[] permissions, 
                int[] grantResults)

Callback for the result from requesting permissions. This method is invoked for every call on requestPermissions(String[], int).

Note: It is possible that the permissions request interaction with the user is interrupted. In this case you will receive empty permissions and results arrays which should be treated as a cancellation.

Parameters
`requestCode`	`int`: The request code passed in `requestPermissions(String[], int)`.
`permissions`	`String`: The requested permissions. Never null.
`grantResults`	`int`: The grant results for the corresponding permissions which is either `PERMISSION_GRANTED` or `PERMISSION_DENIED`. Never null.

See also:

requestPermissions(String[], int)

onRestoreInstanceState

Added in API level 21

void onRestoreInstanceState (Bundle savedInstanceState, 
                PersistableBundle persistentState)

This is the same as onRestoreInstanceState(Bundle) but is called for activities created with the attribute persistableMode set to persistAcrossReboots. The PersistableBundle passed came from the restored PersistableBundle first saved in onSaveInstanceState(Bundle, PersistableBundle).

This method is called between onStart() and onPostCreate(Bundle).

If this method is called onRestoreInstanceState(Bundle) will not be called.

Parameters
`savedInstanceState`	`Bundle`: the data most recently supplied in `onSaveInstanceState(Bundle)`.
`persistentState`	`PersistableBundle`: the data most recently supplied in `onSaveInstanceState(Bundle)`.

See also:

onRetainNonConfigurationInstance

Added in API level 1

Object onRetainNonConfigurationInstance ()

Called by the system, as part of destroying an activity due to a configuration change, when it is known that a new instance will immediately be created for the new configuration. You can return any object you like here, including the activity instance itself, which can later be retrieved by calling getLastNonConfigurationInstance() in the new activity instance. If you are targeting HONEYCOMB or later, consider instead using a Fragment with Fragment.setRetainInstance(boolean.

This function is called purely as an optimization, and you must not rely on it being called. When it is called, a number of guarantees will be made to help optimize configuration switching:

The function will be called between onStop() and onDestroy().
A new instance of the activity will always be immediately created after this one's onDestroy() is called. In particular, no messages will be dispatched during this time (when the returned object does not have an activity to be associated with).
The object you return here will always be available from the getLastNonConfigurationInstance() method of the following activity instance as described there.

These guarantees are designed so that an activity can use this API to propagate extensive state from the old to new activity instance, from loaded bitmaps, to network connections, to evenly actively running threads. Note that you should not propagate any data that may change based on the configuration, including any data loaded from resources such as strings, layouts, or drawables.

The guarantee of no message handling during the switch to the next activity simplifies use with active objects. For example if your retained state is an AsyncTask you are guaranteed that its call back functions (like onPostExecute(Result)) will not be called from the call here until you execute the next instance's onCreate(Bundle). (Note however that there is of course no such guarantee for doInBackground(Params...) since that is running in a separate thread.)

Note: For most cases you should use the Fragment API setRetainInstance(boolean) instead; this is also available on older platforms through the Android support libraries.

Returns
`Object`	any Object holding the desired state to propagate to the next activity instance

onSaveInstanceState

Added in API level 21

void onSaveInstanceState (Bundle outState, 
                PersistableBundle outPersistentState)

This is the same as onSaveInstanceState(Bundle) but is called for activities created with the attribute persistableMode set to persistAcrossReboots. The PersistableBundle passed in will be saved and presented in onCreate(Bundle, PersistableBundle) the first time that this activity is restarted following the next device reboot.

Parameters
`outState`	`Bundle`: Bundle in which to place your saved state.
`outPersistentState`	`PersistableBundle`: State which will be saved across reboots.

See also:

onSearchRequested

Added in API level 23

boolean onSearchRequested (SearchEvent searchEvent)

This hook is called when the user signals the desire to start a search.

You can use this function as a simple way to launch the search UI, in response to a menu item, search button, or other widgets within your activity. Unless overidden, calling this function is the same as calling startSearch(null, false, null, false), which launches search for the current activity as specified in its manifest, see SearchManager.

You can override this function to force global search, e.g. in response to a dedicated search key, or to block search entirely (by simply returning false).

Note: when running in a UI_MODE_TYPE_TELEVISION, the default implementation changes to simply return false and you must supply your own custom implementation if you want to support search.

Parameters
`searchEvent`	`SearchEvent`: The `SearchEvent` that signaled this search.

Returns
`boolean`	Returns `true` if search launched, and `false` if the activity does not respond to search. The default implementation always returns `true`, except when in `UI_MODE_TYPE_TELEVISION` mode where it returns false.

See also:

SearchManager

onSearchRequested

Added in API level 1

boolean onSearchRequested ()

Called when the user signals the desire to start a search.

Returns
`boolean`	true if search launched, false if activity refuses (blocks)

See also:

onSearchRequested(SearchEvent)

onStateNotSaved

Added in API level 23

void onStateNotSaved ()

Called when an onResume() is coming up, prior to other pre-resume callbacks such as onNewIntent(Intent) and onActivityResult(int, int, Intent). This is primarily intended to give the activity a hint that its state is no longer saved -- it will generally be called after onSaveInstanceState(Bundle) and prior to the activity being resumed/started again.

onTouchEvent

Added in API level 1

boolean onTouchEvent (MotionEvent event)

Called when a touch screen event was not handled by any of the views under it. This is most useful to process touch events that happen outside of your window bounds, where there is no view to receive it.

Parameters
`event`	`MotionEvent`: The touch screen event being processed.

Returns
`boolean`	Return true if you have consumed the event, false if you haven't. The default implementation always returns false.

onTrackballEvent

Added in API level 1

boolean onTrackballEvent (MotionEvent event)

Called when the trackball was moved and not handled by any of the views inside of the activity. So, for example, if the trackball moves while focus is on a button, you will receive a call here because buttons do not normally do anything with trackball events. The call here happens before trackball movements are converted to DPAD key events, which then get sent back to the view hierarchy, and will be processed at the point for things like focus navigation.

Parameters
`event`	`MotionEvent`: The trackball event being processed.

Returns
`boolean`	Return true if you have consumed the event, false if you haven't. The default implementation always returns false.

onTrimMemory

Added in API level 14

void onTrimMemory (int level)

Called when the operating system has determined that it is a good time for a process to trim unneeded memory from its process. This will happen for example when it goes in the background and there is not enough memory to keep as many background processes running as desired. You should never compare to exact values of the level, since new intermediate values may be added -- you will typically want to compare if the value is greater or equal to a level you are interested in.

To retrieve the processes current trim level at any point, you can use ActivityManager.getMyMemoryState(RunningAppProcessInfo).

Parameters
`level`	`int`: The context of the trim, giving a hint of the amount of trimming the application may like to perform. May be `TRIM_MEMORY_COMPLETE`, `TRIM_MEMORY_MODERATE`, `TRIM_MEMORY_BACKGROUND`, `TRIM_MEMORY_UI_HIDDEN`, `TRIM_MEMORY_RUNNING_CRITICAL`, `TRIM_MEMORY_RUNNING_LOW`, or `TRIM_MEMORY_RUNNING_MODERATE`.

onUserInteraction

Added in API level 3

void onUserInteraction ()

Called whenever a key, touch, or trackball event is dispatched to the activity. Implement this method if you wish to know that the user has interacted with the device in some way while your activity is running. This callback and onUserLeaveHint() are intended to help activities manage status bar notifications intelligently; specifically, for helping activities determine the proper time to cancel a notfication.

All calls to your activity's onUserLeaveHint() callback will be accompanied by calls to onUserInteraction(). This ensures that your activity will be told of relevant user activity such as pulling down the notification pane and touching an item there.

Note that this callback will be invoked for the touch down action that begins a touch gesture, but may not be invoked for the touch-moved and touch-up actions that follow.

See also:

onUserLeaveHint()

onVisibleBehindCanceled

Added in API level 21

void onVisibleBehindCanceled ()

Called when a translucent activity over this activity is becoming opaque or another activity is being launched. Activities that override this method must call super.onVisibleBehindCanceled() or a SuperNotCalledException will be thrown.

When this method is called the activity has 500 msec to release any resources it may be using while visible in the background. If the activity has not returned from this method in 500 msec the system will destroy the activity and kill the process in order to recover the resources for another process. Otherwise onStop() will be called following return.

See also:

onWindowAttributesChanged

Added in API level 1

void onWindowAttributesChanged (WindowManager.LayoutParams params)

This is called whenever the current window attributes change.

Parameters
`params`	`WindowManager.LayoutParams`

onWindowFocusChanged

Added in API level 1

void onWindowFocusChanged (boolean hasFocus)

Called when the current Window of the activity gains or loses focus. This is the best indicator of whether this activity is visible to the user. The default implementation clears the key tracking state, so should always be called.

Note that this provides information about global focus state, which is managed independently of activity lifecycles. As such, while focus changes will generally have some relation to lifecycle changes (an activity that is stopped will not generally get window focus), you should not rely on any particular order between the callbacks here and those in the other lifecycle methods such as onResume().

As a general rule, however, a resumed activity will have window focus... unless it has displayed other dialogs or popups that take input focus, in which case the activity itself will not have focus when the other windows have it. Likewise, the system may display system-level windows (such as the status bar notification panel or a system alert) which will temporarily take window input focus without pausing the foreground activity.

Parameters
`hasFocus`	`boolean`: Whether the window of this activity has focus.

See also:

onWindowStartingActionMode

Added in API level 23

ActionMode onWindowStartingActionMode (ActionMode.Callback callback, 
                int type)

Called when an action mode is being started for this window. Gives the callback an opportunity to handle the action mode in its own unique and beautiful way. If this method returns null the system can choose a way to present the mode or choose not to start the mode at all.

Parameters
`callback`	`ActionMode.Callback`: Callback to control the lifecycle of this action mode
`type`	`int`: One of `TYPE_PRIMARY` or `TYPE_FLOATING`.

Returns
`ActionMode`	The ActionMode that was started, or null if the system should present it

onWindowStartingActionMode

Added in API level 11

ActionMode onWindowStartingActionMode (ActionMode.Callback callback)

Give the Activity a chance to control the UI for an action mode requested by the system.

Note: If you are looking for a notification callback that an action mode has been started for this activity, see onActionModeStarted(ActionMode).

Parameters
`callback`	`ActionMode.Callback`: The callback that should control the new action mode

Returns
`ActionMode`	The new action mode, or `null` if the activity does not want to provide special handling for this action mode. (It will be handled by the system.)

openContextMenu

Added in API level 1

void openContextMenu (View view)

Programmatically opens the context menu for a particular view. The view should have been added via registerForContextMenu(View).

Parameters
`view`	`View`: The view to show the context menu for.

openOptionsMenu

Added in API level 1

void openOptionsMenu ()

Programmatically opens the options menu. If the options menu is already open, this method does nothing.

overridePendingTransition

Added in API level 5

void overridePendingTransition (int enterAnim, 
                int exitAnim)

Call immediately after one of the flavors of startActivity(Intent) or finish() to specify an explicit transition animation to perform next.

As of JELLY_BEAN an alternative to using this with starting activities is to supply the desired animation information through a ActivityOptions bundle to {@link #startActivity(Intent, Bundle) or a related function. This allows you to specify a custom animation even when starting an activity from outside the context of the current top activity.

Parameters
`enterAnim`	`int`: A resource ID of the animation resource to use for the incoming activity. Use 0 for no animation.
`exitAnim`	`int`: A resource ID of the animation resource to use for the outgoing activity. Use 0 for no animation.

postponeEnterTransition

Added in API level 21

void postponeEnterTransition ()

Postpone the entering activity transition when Activity was started with makeSceneTransitionAnimation(Activity, android.util.Pair[]).

This method gives the Activity the ability to delay starting the entering and shared element transitions until all data is loaded. Until then, the Activity won't draw into its window, leaving the window transparent. This may also cause the returning animation to be delayed until data is ready. This method should be called in onCreate(android.os.Bundle) or in onActivityReenter(int, android.content.Intent). startPostponedEnterTransition() must be called to allow the Activity to start the transitions. If the Activity did not use makeSceneTransitionAnimation(Activity, android.util.Pair[]), then this method does nothing.

recreate

Added in API level 11

void recreate ()

Cause this Activity to be recreated with a new instance. This results in essentially the same flow as when the Activity is created due to a configuration change -- the current instance will go through its lifecycle to onDestroy() and a new instance then created after it.

registerForContextMenu

Added in API level 1

void registerForContextMenu (View view)

Registers a context menu to be shown for the given view (multiple views can show the context menu). This method will set the View.OnCreateContextMenuListener on the view to this activity, so onCreateContextMenu(ContextMenu, View, ContextMenuInfo) will be called when it is time to show the context menu.

Parameters
`view`	`View`: The view that should show a context menu.

See also:

unregisterForContextMenu(View)

releaseInstance

Added in API level 21

boolean releaseInstance ()

Ask that the local app instance of this activity be released to free up its memory. This is asking for the activity to be destroyed, but does not finish the activity -- a new instance of the activity will later be re-created if needed due to the user navigating back to it.

Returns
`boolean`	Returns true if the activity was in a state that it has started the process of destroying its current instance; returns false if for any reason this could not be done: it is currently visible to the user, it is already being destroyed, it is being finished, it hasn't yet saved its state, etc.

removeDialog

Added in API level 1

void removeDialog (int id)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Removes any internal references to a dialog managed by this Activity. If the dialog is showing, it will dismiss it as part of the clean up.

This can be useful if you know that you will never show a dialog again and want to avoid the overhead of saving and restoring it in the future.

As of GINGERBREAD, this function will not throw an exception if you try to remove an ID that does not currently have an associated dialog.

Parameters
`id`	`int`: The id of the managed dialog.

See also:

reportFullyDrawn

Added in API level 19

void reportFullyDrawn ()

Report to the system that your app is now fully drawn, purely for diagnostic purposes (calling it does not impact the visible behavior of the activity). This is only used to help instrument application launch times, so that the app can report when it is fully in a usable state; without this, the only thing the system itself can determine is the point at which the activity's window is first drawn and displayed. To participate in app launch time measurement, you should always call this method after first launch (when onCreate(android.os.Bundle) is called), at the point where you have entirely drawn your UI and populated with all of the significant data. You can safely call this method any time after first launch as well, in which case it will simply be ignored.

requestDragAndDropPermissions

Added in API level 24

DragAndDropPermissions requestDragAndDropPermissions (DragEvent event)

Create DragAndDropPermissions object bound to this activity and controlling the access permissions for content URIs associated with the DragEvent.

Parameters
`event`	`DragEvent`: Drag event

Returns
`DragAndDropPermissions`	The `DragAndDropPermissions` object used to control access to the content URIs. Null if no content URIs are associated with the event or if permissions could not be granted.

requestPermissions

Added in API level 23

void requestPermissions (String[] permissions, 
                int requestCode)

Requests permissions to be granted to this application. These permissions must be requested in your manifest, they should not be granted to your app, and they should have protection level #PROTECTION_DANGEROUS dangerous, regardless whether they are declared by the platform or a third-party app.

Normal permissions PROTECTION_NORMAL are granted at install time if requested in the manifest. Signature permissions PROTECTION_SIGNATURE are granted at install time if requested in the manifest and the signature of your app matches the signature of the app declaring the permissions.

If your app does not have the requested permissions the user will be presented with UI for accepting them. After the user has accepted or rejected the requested permissions you will receive a callback on onRequestPermissionsResult(int, String[], int[]) reporting whether the permissions were granted or not.

Note that requesting a permission does not guarantee it will be granted and your app should be able to run without having this permission.

This method may start an activity allowing the user to choose which permissions to grant and which to reject. Hence, you should be prepared that your activity may be paused and resumed. Further, granting some permissions may require a restart of you application. In such a case, the system will recreate the activity stack before delivering the result to onRequestPermissionsResult(int, String[], int[]).

When checking whether you have a permission you should use checkSelfPermission(String).

Calling this API for permissions already granted to your app would show UI to the user to decide whether the app can still hold these permissions. This can be useful if the way your app uses data guarded by the permissions changes significantly.

You cannot request a permission if your activity sets noHistory to true because in this case the activity would not receive result callbacks including onRequestPermissionsResult(int, String[], int[]).

The RuntimePermissions sample app demonstrates how to use this method to request permissions at run time.

Parameters
`permissions`	`String`: The requested permissions. Must me non-null and not empty.
`requestCode`	`int`: Application specific request code to match with a result reported to `onRequestPermissionsResult(int, String[], int[])`. Should be >= 0.

See also:

requestShowKeyboardShortcuts

Added in API level 24

void requestShowKeyboardShortcuts ()

Request the Keyboard Shortcuts screen to show up. This will trigger onProvideKeyboardShortcuts(List, Menu, int) to retrieve the shortcuts for the foreground activity.

requestVisibleBehind

Added in API level 21

boolean requestVisibleBehind (boolean visible)

Activities that want to remain visible behind a translucent activity above them must call this method anytime between the start of onResume() and the return from onPause(). If this call is successful then the activity will remain visible after onPause() is called, and is allowed to continue playing media in the background.

The actions of this call are reset each time that this activity is brought to the front. That is, every time onResume() is called the activity will be assumed to not have requested visible behind. Therefore, if you want this activity to continue to be visible in the background you must call this method again.

Only fullscreen opaque activities may make this call. I.e. this call is a nop for dialog and translucent activities.

Under all circumstances, the activity must stop playing and release resources prior to or within a call to onVisibleBehindCanceled() or if this call returns false.

False will be returned any time this method is called between the return of onPause and the next call to onResume.

Parameters
`visible`	`boolean`: true to notify the system that the activity wishes to be visible behind other translucent activities, false to indicate otherwise. Resources must be released when passing false to this method.

Returns

boolean the resulting visibiity state. If true the activity will remain visible beyond onPause() if the next activity is translucent or not fullscreen. If false then the activity may not count on being visible behind other translucent activities, and must stop any media playback and release resources. Returning false may occur in lieu of a call to onVisibleBehindCanceled() so the return value must be checked.

See also:

requestWindowFeature

Added in API level 1

boolean requestWindowFeature (int featureId)

Enable extended window features. This is a convenience for calling getWindow().requestFeature().

Parameters
`featureId`	`int`: The desired feature as defined in `Window`.

Returns
`boolean`	Returns true if the requested feature is supported and now enabled.

See also:

requestFeature(int)

runOnUiThread

Added in API level 1

void runOnUiThread (Runnable action)

Runs the specified action on the UI thread. If the current thread is the UI thread, then the action is executed immediately. If the current thread is not the UI thread, the action is posted to the event queue of the UI thread.

Parameters
`action`	`Runnable`: the action to run on the UI thread

setActionBar

Added in API level 21

void setActionBar (Toolbar toolbar)

Set a Toolbar to act as the ActionBar for this Activity window.

When set to a non-null value the getActionBar() method will return an ActionBar object that can be used to control the given toolbar as if it were a traditional window decor action bar. The toolbar's menu will be populated with the Activity's options menu and the navigation button will be wired through the standard home menu select action.

In order to use a Toolbar within the Activity's window content the application must not request the window feature FEATURE_ACTION_BAR.

Parameters
`toolbar`	`Toolbar`: Toolbar to set as the Activity's action bar, or `null` to clear it

setContentTransitionManager

Added in API level 21

void setContentTransitionManager (TransitionManager tm)

Set the TransitionManager to use for default transitions in this window. Requires FEATURE_CONTENT_TRANSITIONS.

Parameters
`tm`	`TransitionManager`: The TransitionManager to use for scene changes.

setContentView

Added in API level 1

void setContentView (View view, 
                ViewGroup.LayoutParams params)

Set the activity content to an explicit view. This view is placed directly into the activity's view hierarchy. It can itself be a complex view hierarchy.

Parameters
`view`	`View`: The desired content to display.
`params`	`ViewGroup.LayoutParams`: Layout parameters for the view.

See also:

setContentView

Added in API level 1

void setContentView (View view)

Set the activity content to an explicit view. This view is placed directly into the activity's view hierarchy. It can itself be a complex view hierarchy. When calling this method, the layout parameters of the specified view are ignored. Both the width and the height of the view are set by default to MATCH_PARENT. To use your own layout parameters, invoke setContentView(android.view.View, android.view.ViewGroup.LayoutParams) instead.

Parameters
`view`	`View`: The desired content to display.

See also:

setContentView

Added in API level 1

void setContentView (int layoutResID)

Set the activity content from a layout resource. The resource will be inflated, adding all top-level views to the activity.

Parameters
`layoutResID`	`int`: Resource ID to be inflated.

See also:

setDefaultKeyMode

Added in API level 1

void setDefaultKeyMode (int mode)

Select the default key handling for this activity. This controls what will happen to key events that are not otherwise handled. The default mode (DEFAULT_KEYS_DISABLE) will simply drop them on the floor. Other modes allow you to launch the dialer (DEFAULT_KEYS_DIALER), execute a shortcut in your options menu without requiring the menu key be held down (DEFAULT_KEYS_SHORTCUT), or launch a search (DEFAULT_KEYS_SEARCH_LOCAL and DEFAULT_KEYS_SEARCH_GLOBAL).

Note that the mode selected here does not impact the default handling of system keys, such as the "back" and "menu" keys, and your activity and its views always get a first chance to receive and handle all application keys.

Parameters
`mode`	`int`: The desired default key mode constant.

See also:

setEnterSharedElementCallback

Added in API level 21

void setEnterSharedElementCallback (SharedElementCallback callback)

When makeSceneTransitionAnimation(Activity, android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launched Activity. This requires FEATURE_ACTIVITY_TRANSITIONS.

Parameters
`callback`	`SharedElementCallback`: Used to manipulate shared element transitions on the launched Activity.

setExitSharedElementCallback

Added in API level 21

void setExitSharedElementCallback (SharedElementCallback callback)

When makeSceneTransitionAnimation(Activity, android.view.View, String) was used to start an Activity, callback will be called to handle shared elements on the launching Activity. Most calls will only come when returning from the started Activity. This requires FEATURE_ACTIVITY_TRANSITIONS.

Parameters
`callback`	`SharedElementCallback`: Used to manipulate shared element transitions on the launching Activity.

setFeatureDrawable

Added in API level 1

void setFeatureDrawable (int featureId, 
                Drawable drawable)

Convenience for calling setFeatureDrawable(int, Drawable).

Parameters
`featureId`	`int`
`drawable`	`Drawable`

setFeatureDrawableAlpha

Added in API level 1

void setFeatureDrawableAlpha (int featureId, 
                int alpha)

Convenience for calling setFeatureDrawableAlpha(int, int).

Parameters
`featureId`	`int`
`alpha`	`int`

setFeatureDrawableResource

Added in API level 1

void setFeatureDrawableResource (int featureId, 
                int resId)

Convenience for calling setFeatureDrawableResource(int, int).

Parameters
`featureId`	`int`
`resId`	`int`

setFeatureDrawableUri

Added in API level 1

void setFeatureDrawableUri (int featureId, 
                Uri uri)

Convenience for calling setFeatureDrawableUri(int, Uri).

Parameters
`featureId`	`int`
`uri`	`Uri`

setFinishOnTouchOutside

Added in API level 11

void setFinishOnTouchOutside (boolean finish)

Sets whether this activity is finished when touched outside its window's bounds.

Parameters
`finish`	`boolean`

setImmersive

Added in API level 18

void setImmersive (boolean i)

Adjust the current immersive mode setting. Note that changing this value will have no effect on the activity's ActivityInfo structure; that is, if android:immersive is set to true in the application's manifest entry for this activity, the ActivityInfo.flags member will always have its FLAG_IMMERSIVE bit set.

Parameters
`i`	`boolean`

See also:

isImmersive()
FLAG_IMMERSIVE

setIntent

Added in API level 1

void setIntent (Intent newIntent)

Change the intent returned by getIntent(). This holds a reference to the given intent; it does not copy it. Often used in conjunction with onNewIntent(Intent).

Parameters
`newIntent`	`Intent`: The new Intent object to return from getIntent

See also:

setMediaController

Added in API level 21

void setMediaController (MediaController controller)

Sets a MediaController to send media keys and volume changes to.

The controller will be tied to the window of this Activity. Media key and volume events which are received while the Activity is in the foreground will be forwarded to the controller and used to invoke transport controls or adjust the volume. This may be used instead of or in addition to setVolumeControlStream(int) to affect a specific session instead of a specific stream.

It is not guaranteed that the hardware volume controls will always change this session's volume (for example, if a call is in progress, its stream's volume may be changed instead). To reset back to the default use null as the controller.

Parameters
`controller`	`MediaController`: The controller for the session which should receive media keys and volume changes.

setProgress

Added in API level 1

void setProgress (int progress)

This method was deprecated in API level 24.
No longer supported starting in API 21.

Sets the progress for the progress bars in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
`progress`	`int`: The progress for the progress bar. Valid ranges are from 0 to 10000 (both inclusive). If 10000 is given, the progress bar will be completely filled and will fade out.

setProgressBarIndeterminate

Added in API level 1

void setProgressBarIndeterminate (boolean indeterminate)

This method was deprecated in API level 24.
No longer supported starting in API 21.

Sets whether the horizontal progress bar in the title should be indeterminate (the circular is always indeterminate).

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
`indeterminate`	`boolean`: Whether the horizontal progress bar should be indeterminate.

setProgressBarIndeterminateVisibility

Added in API level 1

void setProgressBarIndeterminateVisibility (boolean visible)

This method was deprecated in API level 24.
No longer supported starting in API 21.

Sets the visibility of the indeterminate progress bar in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
`visible`	`boolean`: Whether to show the progress bars in the title.

setProgressBarVisibility

Added in API level 1

void setProgressBarVisibility (boolean visible)

This method was deprecated in API level 24.
No longer supported starting in API 21.

Sets the visibility of the progress bar in the title.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
`visible`	`boolean`: Whether to show the progress bars in the title.

setRequestedOrientation

Added in API level 1

void setRequestedOrientation (int requestedOrientation)

Change the desired orientation of this activity. If the activity is currently in the foreground or otherwise impacting the screen orientation, the screen will immediately be changed (possibly causing the activity to be restarted). Otherwise, this will be used the next time the activity is visible.

Parameters
`requestedOrientation`	`int`: An orientation constant as used in `ActivityInfo.screenOrientation`.

setResult

Added in API level 1

void setResult (int resultCode, 
                Intent data)

Call this to set the result that your activity will return to its caller.

As of GINGERBREAD, the Intent you supply here can have Intent.FLAG_GRANT_READ_URI_PERMISSION and/or Intent.FLAG_GRANT_WRITE_URI_PERMISSION set. This will grant the Activity receiving the result access to the specific URIs in the Intent. Access will remain until the Activity has finished (it will remain across the hosting process being killed and other temporary destruction) and will be added to any existing set of URI permissions it already holds.

Parameters
`resultCode`	`int`: The result code to propagate back to the originating activity, often RESULT_CANCELED or RESULT_OK
`data`	`Intent`: The data to propagate back to the originating activity.

See also:

setResult

Added in API level 1

void setResult (int resultCode)

Call this to set the result that your activity will return to its caller.

Parameters
`resultCode`	`int`: The result code to propagate back to the originating activity, often RESULT_CANCELED or RESULT_OK

See also:

setSecondaryProgress

Added in API level 1

void setSecondaryProgress (int secondaryProgress)

This method was deprecated in API level 24.
No longer supported starting in API 21.

Sets the secondary progress for the progress bar in the title. This progress is drawn between the primary progress (set via setProgress(int) and the background. It can be ideal for media scenarios such as showing the buffering progress while the default progress shows the play progress.

In order for the progress bar to be shown, the feature must be requested via requestWindowFeature(int).

Parameters
`secondaryProgress`	`int`: The secondary progress for the progress bar. Valid ranges are from 0 to 10000 (both inclusive).

setTaskDescription

Added in API level 21

void setTaskDescription (ActivityManager.TaskDescription taskDescription)

Sets information describing the task with this activity for presentation inside the Recents System UI. When getRecentTasks(int, int) is called, the activities of each task are traversed in order from the topmost activity to the bottommost. The traversal continues for each property until a suitable value is found. For each task the taskDescription will be returned in ActivityManager.TaskDescription.

Parameters
`taskDescription`	`ActivityManager.TaskDescription`: The TaskDescription properties that describe the task with this activity

See also:

setTheme

Added in API level 1

void setTheme (int resid)

Set the base theme for this context. Note that this should be called before any views are instantiated in the Context (for example before calling setContentView(View) or inflate(int, ViewGroup)).

Parameters
`resid`	`int`: The style resource describing the theme.

setTitle

Added in API level 1

void setTitle (CharSequence title)

Change the title associated with this activity. If this is a top-level activity, the title for its window will change. If it is an embedded activity, the parent can do whatever it wants with it.

Parameters
`title`	`CharSequence`

setTitle

Added in API level 1

void setTitle (int titleId)

Change the title associated with this activity. If this is a top-level activity, the title for its window will change. If it is an embedded activity, the parent can do whatever it wants with it.

Parameters
`titleId`	`int`

setTitleColor

Added in API level 1

void setTitleColor (int textColor)

This method was deprecated in API level 21.
Use action bar styles instead.

Change the color of the title associated with this activity.

This method is deprecated starting in API Level 11 and replaced by action bar styles. For information on styling the Action Bar, read the Action Bar developer guide.

Parameters
`textColor`	`int`

setVisible

Added in API level 3

void setVisible (boolean visible)

Control whether this activity's main window is visible. This is intended only for the special case of an activity that is not going to show a UI itself, but can't just finish prior to onResume() because it needs to wait for a service binding or such. Setting this to false allows you to prevent your UI from being shown during that time.

The default value for this is taken from the windowNoDisplay attribute of the activity's theme.

Parameters
`visible`	`boolean`

setVolumeControlStream

Added in API level 1

void setVolumeControlStream (int streamType)

Suggests an audio stream whose volume should be changed by the hardware volume controls.

The suggested audio stream will be tied to the window of this Activity. Volume requests which are received while the Activity is in the foreground will affect this stream.

It is not guaranteed that the hardware volume controls will always change this stream's volume (for example, if a call is in progress, its stream's volume may be changed instead). To reset back to the default, use USE_DEFAULT_STREAM_TYPE.

Parameters
`streamType`	`int`: The type of the audio stream whose volume should be changed by the hardware volume controls.

setVrModeEnabled

Added in API level 24

void setVrModeEnabled (boolean enabled, 
                ComponentName requestedComponent)

Enable or disable virtual reality (VR) mode for this Activity.

VR mode is a hint to Android system to switch to a mode optimized for VR applications while this Activity has user focus.

It is recommended that applications additionally declare enableVrMode in their manifest to allow for smooth activity transitions when switching between VR activities.

If the requested VrListenerService component is not available, VR mode will not be started. Developers can handle this case as follows:

 String servicePackage = "com.whatever.app";
 String serviceClass = "com.whatever.app.MyVrListenerService";

 // Name of the component of the VrListenerService to start.
 ComponentName serviceComponent = new ComponentName(servicePackage, serviceClass);

 try {
    setVrModeEnabled(true, myComponentName);
 } catch (PackageManager.NameNotFoundException e) {
        List<ApplicationInfo> installed = getPackageManager().getInstalledApplications(0);
        boolean isInstalled = false;
        for (ApplicationInfo app : installed) {
            if (app.packageName.equals(servicePackage)) {
                isInstalled = true;
                break;
            }
        }
        if (isInstalled) {
            // Package is installed, but not enabled in Settings.  Let user enable it.
            startActivity(new Intent(Settings.ACTION_VR_LISTENER_SETTINGS));
        } else {
            // Package is not installed.  Send an intent to download this.
            sentIntentToLaunchAppStore(servicePackage);
        }
 }

Parameters
`enabled`	`boolean`: `true` to enable this mode.
`requestedComponent`	`ComponentName`: the name of the component to use as a `VrListenerService` while VR mode is enabled.

Throws
`PackageManager.NameNotFoundException`	if the given component to run as a `VrListenerService` is not installed, or has not been enabled in user settings.

See also:

shouldShowRequestPermissionRationale

Added in API level 23

boolean shouldShowRequestPermissionRationale (String permission)

Gets whether you should show UI with rationale for requesting a permission. You should do this only if you do not have the permission and the context in which the permission is requested does not clearly communicate to the user what would be the benefit from granting this permission.

For example, if you write a camera app, requesting the camera permission would be expected by the user and no rationale for why it is requested is needed. If however, the app needs location for tagging photos then a non-tech savvy user may wonder how location is related to taking photos. In this case you may choose to show UI with rationale of requesting this permission.

Parameters
`permission`	`String`: A permission your app wants to request.

Returns
`boolean`	Whether you can show permission rationale UI.

See also:

shouldUpRecreateTask

Added in API level 16

boolean shouldUpRecreateTask (Intent targetIntent)

Returns true if the app should recreate the task when navigating 'up' from this activity by using targetIntent.

If this method returns false the app can trivially call navigateUpTo(Intent) using the same parameters to correctly perform up navigation. If this method returns false, the app should synthesize a new task stack by using TaskStackBuilder or another similar mechanism to perform up navigation.

Parameters
`targetIntent`	`Intent`: An intent representing the target destination for up navigation

Returns
`boolean`	true if navigating up should recreate a new task stack, false if the same task should be used for the destination

showAssist

Added in API level 23

boolean showAssist (Bundle args)

Ask to have the current assistant shown to the user. This only works if the calling activity is the current foreground activity. It is the same as calling VoiceInteractionService.showSession and requesting all of the possible context. The receiver will always see SHOW_SOURCE_APPLICATION set.

Parameters
`args`	`Bundle`

Returns
`boolean`	Returns true if the assistant was successfully invoked, else false. For example false will be returned if the caller is not the current top activity.

showDialog

Added in API level 8

boolean showDialog (int id, 
                Bundle args)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Show a dialog managed by this activity. A call to onCreateDialog(int, Bundle) will be made with the same id the first time this is called for a given id. From thereafter, the dialog will be automatically saved and restored. If you are targeting HONEYCOMB or later, consider instead using a DialogFragment instead.

Each time a dialog is shown, onPrepareDialog(int, Dialog, Bundle) will be made to provide an opportunity to do any timely preparation.

Parameters
`id`	`int`: The id of the managed dialog.
`args`	`Bundle`: Arguments to pass through to the dialog. These will be saved and restored for you. Note that if the dialog is already created, `onCreateDialog(int, Bundle)` will not be called with the new arguments but `onPrepareDialog(int, Dialog, Bundle)` will be. If you need to rebuild the dialog, call `removeDialog(int)` first.

Returns
`boolean`	Returns true if the Dialog was created; false is returned if it is not created because `onCreateDialog(int, Bundle)` returns false.

See also:

showDialog

Added in API level 1

void showDialog (int id)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Simple version of showDialog(int, Bundle) that does not take any arguments. Simply calls showDialog(int, Bundle) with null arguments.

Parameters
`id`	`int`

showLockTaskEscapeMessage

Added in API level 23

void showLockTaskEscapeMessage ()

Shows the user the system defined message for telling the user how to exit lock task mode. The task containing this activity must be in lock task mode at the time of this call for the message to be displayed.

startActionMode

Added in API level 23

ActionMode startActionMode (ActionMode.Callback callback, 
                int type)

Start an action mode of the given type.

Parameters
`callback`	`ActionMode.Callback`: Callback that will manage lifecycle events for this action mode
`type`	`int`: One of `TYPE_PRIMARY` or `TYPE_FLOATING`.

Returns
`ActionMode`	The ActionMode that was started, or null if it was canceled

See also:

ActionMode

startActionMode

Added in API level 11

ActionMode startActionMode (ActionMode.Callback callback)

Start an action mode of the default type TYPE_PRIMARY.

Parameters
`callback`	`ActionMode.Callback`: Callback that will manage lifecycle events for this action mode

Returns
`ActionMode`	The ActionMode that was started, or null if it was canceled

See also:

ActionMode

startActivities

Added in API level 16

void startActivities (Intent[] intents, 
                Bundle options)

Launch a new activity. You will not receive any information about when the activity exits. This implementation overrides the base version, providing information about the activity performing the launch. Because of this additional information, the FLAG_ACTIVITY_NEW_TASK launch flag is not required; if not specified, the new activity will be added to the task of the caller.

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
`intents`	`Intent`: The intents to start.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Throws
	android.content.ActivityNotFoundException

See also:

startActivities

Added in API level 11

void startActivities (Intent[] intents)

Same as startActivities(Intent[], Bundle) with no options specified.

Parameters
`intents`	`Intent`: The intents to start.

Throws
	android.content.ActivityNotFoundException

See also:

startActivity

Added in API level 1

void startActivity (Intent intent)

Same as startActivity(Intent, Bundle) with no options specified.

Parameters
`intent`	`Intent`: The intent to start.

Throws
	android.content.ActivityNotFoundException

See also:

startActivity

Added in API level 16

void startActivity (Intent intent, 
                Bundle options)

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
`intent`	`Intent`: The intent to start.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Throws
	android.content.ActivityNotFoundException

See also:

startActivityForResult

Added in API level 1

void startActivityForResult (Intent intent, 
                int requestCode)

Same as calling startActivityForResult(Intent, int, Bundle) with no options.

Parameters
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits.

Throws
	android.content.ActivityNotFoundException

See also:

startActivity(Intent)

startActivityForResult

Added in API level 16

void startActivityForResult (Intent intent, 
                int requestCode, 
                Bundle options)

Launch an activity for which you would like a result when it finished. When this activity exits, your onActivityResult() method will be called with the given requestCode. Using a negative requestCode is the same as calling startActivity(Intent) (the activity is not launched as a sub-activity).

Note that this method should only be used with Intent protocols that are defined to return a result. In other protocols (such as ACTION_MAIN or ACTION_VIEW), you may not get the result when you expect. For example, if the activity you are launching uses the singleTask launch mode, it will not run in your task and thus you will immediately receive a cancel result.

As a special case, if you call startActivityForResult() with a requestCode >= 0 during the initial onCreate(Bundle savedInstanceState)/onResume() of your activity, then your window will not be displayed until a result is returned back from the started activity. This is to avoid visible flickering when redirecting to another activity.

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Throws
	android.content.ActivityNotFoundException

See also:

startActivity(Intent)

startActivityFromChild

Added in API level 1

void startActivityFromChild (Activity child, 
                Intent intent, 
                int requestCode)

Same as calling startActivityFromChild(Activity, Intent, int, Bundle) with no options.

Parameters
`child`	`Activity`: The activity making the call.
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: Reply request code. < 0 if reply is not requested.

Throws
	android.content.ActivityNotFoundException

See also:

startActivityFromChild

Added in API level 16

void startActivityFromChild (Activity child, 
                Intent intent, 
                int requestCode, 
                Bundle options)

This is called when a child activity of this one calls its startActivity(Intent) or startActivityForResult(Intent, int) method.

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
`child`	`Activity`: The activity making the call.
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: Reply request code. < 0 if reply is not requested.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Throws
	android.content.ActivityNotFoundException

See also:

startActivityFromFragment

Added in API level 16

void startActivityFromFragment (Fragment fragment, 
                Intent intent, 
                int requestCode, 
                Bundle options)

This is called when a Fragment in this activity calls its startActivity(Intent) or startActivityForResult(Intent, int) method.

This method throws ActivityNotFoundException if there was no Activity found to run the given Intent.

Parameters
`fragment`	`Fragment`: The fragment making the call.
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: Reply request code. < 0 if reply is not requested.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Throws
	android.content.ActivityNotFoundException

See also:

startActivityFromFragment

Added in API level 11

void startActivityFromFragment (Fragment fragment, 
                Intent intent, 
                int requestCode)

Same as calling startActivityFromFragment(Fragment, Intent, int, Bundle) with no options.

Parameters
`fragment`	`Fragment`: The fragment making the call.
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: Reply request code. < 0 if reply is not requested.

Throws
	android.content.ActivityNotFoundException

See also:

startActivityIfNeeded

Added in API level 16

boolean startActivityIfNeeded (Intent intent, 
                int requestCode, 
                Bundle options)

A special variation to launch an activity only if a new activity instance is needed to handle the given Intent. In other words, this is just like startActivityForResult(Intent, int) except: if you are using the FLAG_ACTIVITY_SINGLE_TOP flag, or singleTask or singleTop launchMode, and the activity that handles intent is the same as your currently running activity, then a new instance is not needed. In this case, instead of the normal behavior of calling onNewIntent(Intent) this function will return and you can handle the Intent yourself.

This function can only be called from a top-level activity; if it is called from a child activity, a runtime exception will be thrown.

Parameters
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits, as described in `startActivityForResult(Intent, int)`.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Returns
`boolean`	If a new activity was launched then true is returned; otherwise false is returned and you must handle the Intent yourself.

See also:

startActivityIfNeeded

Added in API level 1

boolean startActivityIfNeeded (Intent intent, 
                int requestCode)

Same as calling startActivityIfNeeded(Intent, int, Bundle) with no options.

Parameters
`intent`	`Intent`: The intent to start.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits, as described in `startActivityForResult(Intent, int)`.

Returns
`boolean`	If a new activity was launched then true is returned; otherwise false is returned and you must handle the Intent yourself.

See also:

startIntentSender

Added in API level 5

void startIntentSender (IntentSender intent, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags)

Same as calling startIntentSender(IntentSender, Intent, int, int, int, Bundle) with no options.

Parameters
`intent`	`IntentSender`: The IntentSender to launch.
`fillInIntent`	`Intent`: If non-null, this will be provided as the intent parameter to `sendIntent(Context, int, Intent, IntentSender.OnFinished, Handler)`.
`flagsMask`	`int`: Intent flags in the original IntentSender that you would like to change.
`flagsValues`	`int`: Desired values for any bits set in `flagsMask`
`extraFlags`	`int`: Always set to 0.

Throws
`IntentSender.SendIntentException`

startIntentSender

Added in API level 16

void startIntentSender (IntentSender intent, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags, 
                Bundle options)

Like startActivity(Intent, Bundle), but taking a IntentSender to start; see startIntentSenderForResult(IntentSender, int, Intent, int, int, int, Bundle) for more information.

Parameters
`intent`	`IntentSender`: The IntentSender to launch.
`fillInIntent`	`Intent`: If non-null, this will be provided as the intent parameter to `sendIntent(Context, int, Intent, IntentSender.OnFinished, Handler)`.
`flagsMask`	`int`: Intent flags in the original IntentSender that you would like to change.
`flagsValues`	`int`: Desired values for any bits set in `flagsMask`
`extraFlags`	`int`: Always set to 0.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details. If options have also been supplied by the IntentSender, options given here will override any that conflict with those given by the IntentSender.

Throws
`IntentSender.SendIntentException`

startIntentSenderForResult

Added in API level 5

void startIntentSenderForResult (IntentSender intent, 
                int requestCode, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags)

Same as calling startIntentSenderForResult(IntentSender, int, Intent, int, int, int, Bundle) with no options.

Parameters
`intent`	`IntentSender`: The IntentSender to launch.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits.
`fillInIntent`	`Intent`: If non-null, this will be provided as the intent parameter to `sendIntent(Context, int, Intent, IntentSender.OnFinished, Handler)`.
`flagsMask`	`int`: Intent flags in the original IntentSender that you would like to change.
`flagsValues`	`int`: Desired values for any bits set in `flagsMask`
`extraFlags`	`int`: Always set to 0.

Throws
`IntentSender.SendIntentException`

startIntentSenderForResult

Added in API level 16

void startIntentSenderForResult (IntentSender intent, 
                int requestCode, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags, 
                Bundle options)

Like startActivityForResult(Intent, int), but allowing you to use a IntentSender to describe the activity to be started. If the IntentSender is for an activity, that activity will be started as if you had called the regular startActivityForResult(Intent, int) here; otherwise, its associated action will be executed (such as sending a broadcast) as if you had called IntentSender.sendIntent on it.

Parameters
`intent`	`IntentSender`: The IntentSender to launch.
`requestCode`	`int`: If >= 0, this code will be returned in onActivityResult() when the activity exits.
`fillInIntent`	`Intent`: If non-null, this will be provided as the intent parameter to `sendIntent(Context, int, Intent, IntentSender.OnFinished, Handler)`.
`flagsMask`	`int`: Intent flags in the original IntentSender that you would like to change.
`flagsValues`	`int`: Desired values for any bits set in `flagsMask`
`extraFlags`	`int`: Always set to 0.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details. If options have also been supplied by the IntentSender, options given here will override any that conflict with those given by the IntentSender.

Throws
`IntentSender.SendIntentException`

startIntentSenderFromChild

Added in API level 16

void startIntentSenderFromChild (Activity child, 
                IntentSender intent, 
                int requestCode, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags, 
                Bundle options)

Like startActivityFromChild(Activity, Intent, int), but taking a IntentSender; see startIntentSenderForResult(IntentSender, int, Intent, int, int, int) for more information.

Parameters
`child`	`Activity`
`intent`	`IntentSender`
`requestCode`	`int`
`fillInIntent`	`Intent`
`flagsMask`	`int`
`flagsValues`	`int`
`extraFlags`	`int`
`options`	`Bundle`

Throws
`IntentSender.SendIntentException`

startIntentSenderFromChild

Added in API level 5

void startIntentSenderFromChild (Activity child, 
                IntentSender intent, 
                int requestCode, 
                Intent fillInIntent, 
                int flagsMask, 
                int flagsValues, 
                int extraFlags)

Same as calling startIntentSenderFromChild(Activity, IntentSender, int, Intent, int, int, int, Bundle) with no options.

Parameters
`child`	`Activity`
`intent`	`IntentSender`
`requestCode`	`int`
`fillInIntent`	`Intent`
`flagsMask`	`int`
`flagsValues`	`int`
`extraFlags`	`int`

Throws
`IntentSender.SendIntentException`

startLocalVoiceInteraction

Added in API level 24

void startLocalVoiceInteraction (Bundle privateOptions)

Starts a local voice interaction session. When ready, onLocalVoiceInteractionStarted() is called. You can pass a bundle of private options to the registered voice interaction service.

Parameters
`privateOptions`	`Bundle`: a Bundle of private arguments to the current voice interaction service

startLockTask

Added in API level 21

void startLockTask ()

Request to put this Activity in a mode where the user is locked to the current task. This will prevent the user from launching other apps, going to settings, or reaching the home screen. This does not include those apps whose lockTaskMode values permit launching while locked. If isLockTaskPermitted(String) returns true or lockTaskMode=lockTaskModeAlways for this component then the app will go directly into Lock Task mode. The user will not be able to exit this mode until stopLockTask() is called. If isLockTaskPermitted(String) returns false then the system will prompt the user with a dialog requesting permission to enter this mode. When entered through this method the user can exit at any time through an action described by the request dialog. Calling stopLockTask will also exit the mode.

See also:

lockTaskMode

startManagingCursor

Added in API level 1

void startManagingCursor (Cursor c)

This method was deprecated in API level 11.
Use the new CursorLoader class with LoaderManager instead; this is also available on older platforms through the Android compatibility package.

This method allows the activity to take care of managing the given Cursor's lifecycle for you based on the activity's lifecycle. That is, when the activity is stopped it will automatically call deactivate() on the given Cursor, and when it is later restarted it will call requery() for you. When the activity is destroyed, all managed Cursors will be closed automatically. If you are targeting HONEYCOMB or later, consider instead using LoaderManager instead, available via getLoaderManager().

Warning: Do not call close() on cursor obtained from managedQuery(Uri, String[], String, String[], String), because the activity will do that for you at the appropriate time. However, if you call stopManagingCursor(Cursor) on a cursor from a managed query, the system will not automatically close the cursor and, in that case, you must call close().

Parameters
`c`	`Cursor`: The Cursor to be managed.

See also:

startNextMatchingActivity

Added in API level 16

boolean startNextMatchingActivity (Intent intent, 
                Bundle options)

Special version of starting an activity, for use when you are replacing other activity components. You can use this to hand the Intent off to the next Activity that can handle it. You typically call this in onCreate(Bundle) with the Intent returned by getIntent().

Parameters
`intent`	`Intent`: The intent to dispatch to the next activity. For correct behavior, this must be the same as the Intent that started your own activity; the only changes you can make are to the extras inside of it.
`options`	`Bundle`: Additional options for how the Activity should be started. See `Context.startActivity(Intent, Bundle)` for more details.

Returns
`boolean`	Returns a boolean indicating whether there was another Activity to start: true if there was a next activity to start, false if there wasn't. In general, if true is returned you will then want to call finish() on yourself.

startNextMatchingActivity

Added in API level 1

boolean startNextMatchingActivity (Intent intent)

Same as calling startNextMatchingActivity(Intent, Bundle) with no options.

Parameters
`intent`	`Intent`: The intent to dispatch to the next activity. For correct behavior, this must be the same as the Intent that started your own activity; the only changes you can make are to the extras inside of it.

Returns
`boolean`	Returns a boolean indicating whether there was another Activity to start: true if there was a next activity to start, false if there wasn't. In general, if true is returned you will then want to call finish() on yourself.

startPostponedEnterTransition

Added in API level 21

void startPostponedEnterTransition ()

Begin postponed transitions after postponeEnterTransition() was called. If postponeEnterTransition() was called, you must call startPostponedEnterTransition() to have your Activity start drawing.

startSearch

Added in API level 1

void startSearch (String initialQuery, 
                boolean selectInitialQuery, 
                Bundle appSearchData, 
                boolean globalSearch)

This hook is called to launch the search UI.

It is typically called from onSearchRequested(), either directly from Activity.onSearchRequested() or from an overridden version in any given Activity. If your goal is simply to activate search, it is preferred to call onSearchRequested(), which may have been overridden elsewhere in your Activity. If your goal is to inject specific data such as context data, it is preferred to override onSearchRequested(), so that any callers to it will benefit from the override.

Parameters
`initialQuery`	`String`: Any non-null non-empty string will be inserted as pre-entered text in the search query box.
`selectInitialQuery`	`boolean`: If true, the initial query will be preselected, which means that any further typing will replace it. This is useful for cases where an entire pre-formed query is being inserted. If false, the selection point will be placed at the end of the inserted query. This is useful when the inserted query is text that the user entered, and the user would expect to be able to keep typing. This parameter is only meaningful if initialQuery is a non-empty string.
`appSearchData`	`Bundle`: An application can insert application-specific context here, in order to improve quality or specificity of its own searches. This data will be returned with SEARCH intent(s). Null if no extra data is required.
`globalSearch`	`boolean`: If false, this will only launch the search that has been specifically defined by the application (which is usually defined as a local search). If no default search is defined in the current application or activity, global search will be launched. If true, this will always launch a platform-global (e.g. web-based) search instead.

See also:

stopLocalVoiceInteraction

Added in API level 24

void stopLocalVoiceInteraction ()

Request to terminate the current voice interaction that was previously started using startLocalVoiceInteraction(Bundle). When the interaction is terminated, onLocalVoiceInteractionStopped() will be called.

stopLockTask

Added in API level 21

void stopLockTask ()

Allow the user to switch away from the current task. Called to end the mode started by startLockTask(). This can only be called by activities that have successfully called startLockTask previously. This will allow the user to exit this app and move onto other activities.

Note: This method should only be called when the activity is user-facing. That is, between onResume() and onPause().

Note: If there are other tasks below this one that are also locked then calling this method will immediately finish this task and resume the previous locked one, remaining in lockTask mode.

See also:

stopManagingCursor

Added in API level 1

void stopManagingCursor (Cursor c)

This method was deprecated in API level 11.
Use the new CursorLoader class with LoaderManager instead; this is also available on older platforms through the Android compatibility package.

Given a Cursor that was previously given to startManagingCursor(Cursor), stop the activity's management of that cursor.

Warning: After calling this method on a cursor from a managed query, the system will not automatically close the cursor and you must call close().

Parameters
`c`	`Cursor`: The Cursor that was being managed.

See also:

startManagingCursor(Cursor)

takeKeyEvents

Added in API level 1

void takeKeyEvents (boolean get)

Request that key events come to this activity. Use this if your activity has no views with focus, but the activity still wants a chance to process key events.

Parameters
`get`	`boolean`

See also:

takeKeyEvents(boolean)

triggerSearch

Added in API level 5

void triggerSearch (String query, 
                Bundle appSearchData)

Similar to startSearch(String, boolean, Bundle, boolean), but actually fires off the search query after invoking the search dialog. Made available for testing purposes.

Parameters
`query`	`String`: The query to trigger. If empty, the request will be ignored.
`appSearchData`	`Bundle`: An application can insert application-specific context here, in order to improve quality or specificity of its own searches. This data will be returned with SEARCH intent(s). Null if no extra data is required.

unregisterForContextMenu

Added in API level 1

void unregisterForContextMenu (View view)

Prevents a context menu to be shown for the given view. This method will remove the View.OnCreateContextMenuListener on the view.

Parameters
`view`	`View`: The view that should stop showing a context menu.

See also:

registerForContextMenu(View)

Protected methods

onActivityResult

Added in API level 1

void onActivityResult (int requestCode, 
                int resultCode, 
                Intent data)

Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it. The resultCode will be RESULT_CANCELED if the activity explicitly returned that, didn't return any result, or crashed during its operation.

You will receive this call immediately before onResume() when your activity is re-starting.

This method is never invoked if your activity sets noHistory to true.

Parameters
`requestCode`	`int`: The integer request code originally supplied to startActivityForResult(), allowing you to identify who this result came from.
`resultCode`	`int`: The integer result code returned by the child activity through its setResult().
`data`	`Intent`: An Intent, which can return result data to the caller (various data can be attached to Intent "extras").

See also:

onApplyThemeResource

Added in API level 1

void onApplyThemeResource (Resources.Theme theme, 
                int resid, 
                boolean first)

Called by setTheme(int) and getTheme() to apply a theme resource to the current Theme object. May be overridden to change the default (simple) behavior. This method will not be called in multiple threads simultaneously.

Parameters
`theme`	`Resources.Theme`: the theme being modified
`resid`	`int`: the style resource being applied to `theme`
`first`	`boolean`: `true` if this is the first time a style is being applied to `theme`

onChildTitleChanged

Added in API level 1

void onChildTitleChanged (Activity childActivity, 
                CharSequence title)

Parameters
`childActivity`	`Activity`
`title`	`CharSequence`

onCreate

Added in API level 1

void onCreate (Bundle savedInstanceState)

Called when the activity is starting. This is where most initialization should go: calling setContentView(int) to inflate the activity's UI, using findViewById(int) to programmatically interact with widgets in the UI, calling managedQuery(android.net.Uri, String[], String, String[], String) to retrieve cursors for data being displayed, etc.

You can call finish() from within this function, in which case onDestroy() will be immediately called without any of the rest of the activity lifecycle (onStart(), onResume(), onPause(), etc) executing.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

Parameters
`savedInstanceState`	`Bundle`: If the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in `onSaveInstanceState(Bundle)`. *Note: Otherwise it is null.*

See also:

onCreateDialog

Added in API level 1

Dialog onCreateDialog (int id)

This method was deprecated in API level 8.
Old no-arguments version of onCreateDialog(int, Bundle).

Parameters
`id`	`int`

Returns
`Dialog`

onCreateDialog

Added in API level 8

Dialog onCreateDialog (int id, 
                Bundle args)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Callback for creating dialogs that are managed (saved and restored) for you by the activity. The default implementation calls through to onCreateDialog(int) for compatibility. If you are targeting HONEYCOMB or later, consider instead using a DialogFragment instead.

If you use showDialog(int), the activity will call through to this method the first time, and hang onto it thereafter. Any dialog that is created by this method will automatically be saved and restored for you, including whether it is showing.

If you would like the activity to manage saving and restoring dialogs for you, you should override this method and handle any ids that are passed to showDialog(int).

If you would like an opportunity to prepare your dialog before it is shown, override onPrepareDialog(int, Dialog, Bundle).

Parameters
`id`	`int`: The id of the dialog.
`args`	`Bundle`: The dialog arguments provided to `showDialog(int, Bundle)`.

Returns
`Dialog`	The dialog. If you return null, the dialog will not be created.

See also:

onDestroy

Added in API level 1

void onDestroy ()

Perform any final cleanup before an activity is destroyed. This can happen either because the activity is finishing (someone called finish() on it, or because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the isFinishing() method.

Note: do not count on this method being called as a place for saving data! For example, if an activity is editing data in a content provider, those edits should be committed in either onPause() or onSaveInstanceState(Bundle), not here. This method is usually implemented to free resources like threads that are associated with an activity, so that a destroyed activity does not leave such things around while the rest of its application is still running. There are situations where the system will simply kill the activity's hosting process without calling this method (or any others) in it, so it should not be used to do things that are intended to remain around after the process goes away.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onNewIntent

Added in API level 1

void onNewIntent (Intent intent)

This is called for activities that set launchMode to "singleTop" in their package, or if a client used the FLAG_ACTIVITY_SINGLE_TOP flag when calling startActivity(Intent). In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it.

An activity will always be paused before receiving a new intent, so you can count on onResume() being called after this method.

Note that getIntent() still returns the original Intent. You can use setIntent(Intent) to update it to this new Intent.

Parameters
`intent`	`Intent`: The new intent that was started for the activity.

See also:

onPause

Added in API level 1

void onPause ()

Called as part of the activity lifecycle when an activity is going into the background, but has not (yet) been killed. The counterpart to onResume().

When activity B is launched in front of activity A, this callback will be invoked on A. B will not be created until A's onPause() returns, so be sure to not do anything lengthy here.

This callback is mostly used for saving any persistent state the activity is editing, to present a "edit in place" model to the user and making sure nothing is lost if there are not enough resources to start the new activity without first killing this one. This is also a good place to do things like stop animations and other things that consume a noticeable amount of CPU in order to make the switch to the next activity as fast as possible, or to close resources that are exclusive access such as the camera.

In situations where the system needs more memory it may kill paused processes to reclaim resources. Because of this, you should be sure that all of your state is saved by the time you return from this function. In general onSaveInstanceState(Bundle) is used to save per-instance state in the activity and this method is used to store global persistent data (in content providers, files, etc.)

After receiving this call you will usually receive a following call to onStop() (after the next activity has been resumed and displayed), however in some cases there will be a direct call back to onResume() without going through the stopped state.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onPostCreate

Added in API level 1

void onPostCreate (Bundle savedInstanceState)

Called when activity start-up is complete (after onStart() and onRestoreInstanceState(Bundle) have been called). Applications will generally not implement this method; it is intended for system classes to do final initialization after application code has run.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

Parameters
`savedInstanceState`	`Bundle`: If the activity is being re-initialized after previously being shut down then this Bundle contains the data it most recently supplied in `onSaveInstanceState(Bundle)`. *Note: Otherwise it is null.*

See also:

onCreate(Bundle)

onPostResume

Added in API level 1

void onPostResume ()

Called when activity resume is complete (after onResume() has been called). Applications will generally not implement this method; it is intended for system classes to do final setup after application resume code has run.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onResume()

onPrepareDialog

Added in API level 8

void onPrepareDialog (int id, 
                Dialog dialog, 
                Bundle args)

This method was deprecated in API level 13.
Use the new DialogFragment class with FragmentManager instead; this is also available on older platforms through the Android compatibility package.

Provides an opportunity to prepare a managed dialog before it is being shown. The default implementation calls through to onPrepareDialog(int, Dialog) for compatibility.

Override this if you need to update a managed dialog based on the state of the application each time it is shown. For example, a time picker dialog might want to be updated with the current time. You should call through to the superclass's implementation. The default implementation will set this Activity as the owner activity on the Dialog.

Parameters
`id`	`int`: The id of the managed dialog.
`dialog`	`Dialog`: The dialog.
`args`	`Bundle`: The dialog arguments provided to `showDialog(int, Bundle)`.

See also:

onPrepareDialog

Added in API level 1

void onPrepareDialog (int id, 
                Dialog dialog)

This method was deprecated in API level 8.
Old no-arguments version of onPrepareDialog(int, Dialog, Bundle).

Parameters
`id`	`int`
`dialog`	`Dialog`

onRestart

Added in API level 1

void onRestart ()

Called after onStop() when the current activity is being re-displayed to the user (the user has navigated back to it). It will be followed by onStart() and then onResume().

For activities that are using raw Cursor objects (instead of creating them through managedQuery(android.net.Uri, String[], String, String[], String), this is usually the place where the cursor should be requeried (because you had deactivated it in onStop().

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onRestoreInstanceState

Added in API level 1

void onRestoreInstanceState (Bundle savedInstanceState)

This method is called after onStart() when the activity is being re-initialized from a previously saved state, given here in savedInstanceState. Most implementations will simply use onCreate(Bundle) to restore their state, but it is sometimes convenient to do it here after all of the initialization has been done or to allow subclasses to decide whether to use your default implementation. The default implementation of this method performs a restore of any view state that had previously been frozen by onSaveInstanceState(Bundle).

This method is called between onStart() and onPostCreate(Bundle).

Parameters
`savedInstanceState`	`Bundle`: the data most recently supplied in `onSaveInstanceState(Bundle)`.

See also:

onResume

Added in API level 1

void onResume ()

Called after onRestoreInstanceState(Bundle), onRestart(), or onPause(), for your activity to start interacting with the user. This is a good place to begin animations, open exclusive-access devices (such as the camera), etc.

Keep in mind that onResume is not the best indicator that your activity is visible to the user; a system window such as the keyguard may be in front. Use onWindowFocusChanged(boolean) to know for certain that your activity is visible to the user (for example, to resume a game).

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onSaveInstanceState

Added in API level 1

void onSaveInstanceState (Bundle outState)

Called to retrieve per-instance state from an activity before being killed so that the state can be restored in onCreate(Bundle) or onRestoreInstanceState(Bundle) (the Bundle populated by this method will be passed to both).

This method is called before an activity may be killed so that when it comes back some time in the future it can restore its state. For example, if activity B is launched in front of activity A, and at some point activity A is killed to reclaim resources, activity A will have a chance to save the current state of its user interface via this method so that when the user returns to activity A, the state of the user interface can be restored via onCreate(Bundle) or onRestoreInstanceState(Bundle).

Do not confuse this method with activity lifecycle callbacks such as onPause(), which is always called when an activity is being placed in the background or on its way to destruction, or onStop() which is called before destruction. One example of when onPause() and onStop() is called and not this method is when a user navigates back from activity B to activity A: there is no need to call onSaveInstanceState(Bundle) on B because that particular instance will never be restored, so the system avoids calling it. An example when onPause() is called and not onSaveInstanceState(Bundle) is when activity B is launched in front of activity A: the system may avoid calling onSaveInstanceState(Bundle) on activity A if it isn't killed during the lifetime of B since the state of the user interface of A will stay intact.

The default implementation takes care of most of the UI per-instance state for you by calling onSaveInstanceState() on each view in the hierarchy that has an id, and by saving the id of the currently focused view (all of which is restored by the default implementation of onRestoreInstanceState(Bundle)). If you override this method to save additional information not captured by each individual view, you will likely want to call through to the default implementation, otherwise be prepared to save all of the state of each view yourself.

If called, this method will occur before onStop(). There are no guarantees about whether it will occur before or after onPause().

Parameters
`outState`	`Bundle`: Bundle in which to place your saved state.

See also:

onStart

Added in API level 1

void onStart ()

Called after onCreate(Bundle) — or after onRestart() when the activity had been stopped, but is now again being displayed to the user. It will be followed by onResume().

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onStop

Added in API level 1

void onStop ()

Called when you are no longer visible to the user. You will next receive either onRestart(), onDestroy(), or nothing, depending on later user activity.

Derived classes must call through to the super class's implementation of this method. If they do not, an exception will be thrown.

See also:

onTitleChanged

Added in API level 1

void onTitleChanged (CharSequence title, 
                int color)

Parameters
`title`	`CharSequence`
`color`	`int`

onUserLeaveHint

Added in API level 3

void onUserLeaveHint ()

Called as part of the activity lifecycle when an activity is about to go into the background as the result of user choice. For example, when the user presses the Home key, onUserLeaveHint() will be called, but when an incoming phone call causes the in-call Activity to be automatically brought to the foreground, onUserLeaveHint() will not be called on the activity being interrupted. In cases when it is invoked, this method is called right before the activity's onPause() callback.

This callback and onUserInteraction() are intended to help activities manage status bar notifications intelligently; specifically, for helping activities determine the proper time to cancel a notfication.

See also:

onUserInteraction()