android.app

Contains high-level classes encapsulating the overall Android application model.

An Android application is defined using one or more of Android's four core application components. Two such application components are defined in this package: Activity and Service. The other two components are from the android.content package: BroadcastReceiver and ContentProvider.

An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map. An activity can start other activities, including activities that live in separate applications.

A Service is an application component that can perform long-running operations in the background without a user interface. For example, a service can handle network transactions, play music, or work with a content provider without the user being aware of the work going on.

The Fragment class is also an important part of an application's design—especially when designing for large screen devices, such as tablets. A fragment defines a distinct part of an activity's behavior, including the associated UI. It has its own lifecycle that is similar to that of the activity and can exist alongside other fragments that are embedded in the activity. While an activity is running, you can add and remove fragments and include each fragment in a back stack that's managed by the activity—allowing the user to navigate backwards through the fragment states, without leaving the activity.

This package also defines application utilities, such as dialogs, notifications, and the action bar.

For information about using some the classes in this package, see the following documents: Activities, Services, Fragments, Using the Action Bar, Creating Dialogs, and Notifying the User.

Interfaces

ActionBar.OnMenuVisibilityListener	Listener for receiving events when action bar menus are shown or hidden.
ActionBar.OnNavigationListener	This interface was deprecated in API level 21. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.
ActionBar.TabListener	This interface was deprecated in API level 21. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.
AlarmManager.OnAlarmListener	Direct-notification alarms: the requester must be running continuously from the time the alarm is set to the time it is delivered, or delivery will fail.
Application.ActivityLifecycleCallbacks
Application.OnProvideAssistDataListener	Callback interface for use with registerOnProvideAssistDataListener(Application.OnProvideAssistDataListener) and unregisterOnProvideAssistDataListener(Application.OnProvideAssistDataListener).
AppOpsManager.OnOpChangedListener	Callback for notification of changes to operation state.
DatePickerDialog.OnDateSetListener	The listener used to indicate the user has finished selecting a date.
FragmentBreadCrumbs.OnBreadCrumbClickListener	Interface to intercept clicks on the bread crumbs.
FragmentManager.BackStackEntry	Representation of an entry on the fragment back stack, as created with FragmentTransaction.addToBackStack().
FragmentManager.OnBackStackChangedListener	Interface to watch for changes to the back stack.
KeyguardManager.OnKeyguardExitResult	Callback passed to exitKeyguardSecurely(KeyguardManager.OnKeyguardExitResult) to notify caller of result.
LoaderManager.LoaderCallbacks<D>	Callback interface for a client to interact with the manager.
Notification.Action.Extender	Extender interface for use with extend(Notification.Action.Extender).
Notification.Extender	Extender interface for use with extend(Notification.Action.Extender).
PendingIntent.OnFinished	Callback interface for discovering when a send operation has completed.
SearchManager.OnCancelListener	See setOnCancelListener(SearchManager.OnCancelListener) for configuring your activity to monitor search UI state.
SearchManager.OnDismissListener	See setOnDismissListener(SearchManager.OnDismissListener) for configuring your activity to monitor search UI state.
SharedElementCallback.OnSharedElementsReadyListener	Listener to be called after onSharedElementsArrived(List, List, OnSharedElementsReadyListener) when the shared elements are ready to be hidden in the source Activity and shown in the destination Activity.
TimePickerDialog.OnTimeSetListener	The callback interface used to indicate the user is done filling in the time (e.g.
UiAutomation.AccessibilityEventFilter	Listener for filtering accessibility events.
UiAutomation.OnAccessibilityEventListener	Listener for observing the AccessibilityEvent stream.

Classes

ActionBar	A primary toolbar within the activity that may display the activity title, application-level navigation affordances, and other interactive items.
ActionBar.LayoutParams	Per-child layout information associated with action bar custom views.
ActionBar.Tab	This class was deprecated in API level 21. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.
Activity	An activity is a single, focused thing that the user can do.
ActivityGroup	This class was deprecated in API level 13. Use the new Fragment and FragmentManager APIs instead; these are also available on older platforms through the Android compatibility package.
ActivityManager	Interact with the overall activities running in the system.
ActivityManager.AppTask	The AppTask allows you to manage your own application's tasks.
ActivityManager.MemoryInfo	Information you can retrieve about the available memory through getMemoryInfo(ActivityManager.MemoryInfo).
ActivityManager.ProcessErrorStateInfo	Information you can retrieve about any processes that are in an error condition.
ActivityManager.RecentTaskInfo	Information you can retrieve about tasks that the user has most recently started or visited.
ActivityManager.RunningAppProcessInfo	Information you can retrieve about a running process.
ActivityManager.RunningServiceInfo	Information you can retrieve about a particular Service that is currently running in the system.
ActivityManager.RunningTaskInfo	Information you can retrieve about a particular task that is currently "running" in the system.
ActivityManager.TaskDescription	Information you can set and retrieve about the current activity within the recent task list.
ActivityOptions	Helper class for building an options Bundle that can be used with Context.startActivity(Intent, Bundle) and related methods.
AlarmManager	This class provides access to the system alarm services.
AlarmManager.AlarmClockInfo	An immutable description of a scheduled "alarm clock" event.
AlertDialog	A subclass of Dialog that can display one, two or three buttons.
AlertDialog.Builder
AliasActivity	Stub activity that launches another activity (and then finishes itself) based on information in its component's manifest meta-data.
Application	Base class for maintaining global application state.
ApplicationErrorReport	Describes an application error.
ApplicationErrorReport.AnrInfo	Describes an application not responding error.
ApplicationErrorReport.BatteryInfo	Describes a battery usage report.
ApplicationErrorReport.CrashInfo	Describes an application crash.
ApplicationErrorReport.RunningServiceInfo	Describes a running service report.
AppOpsManager	API for interacting with "application operation" tracking.
AutomaticZenRule	Rule instance information for zen mode.
DatePickerDialog	A simple dialog containing an DatePicker.
Dialog	Base class for Dialogs.
DialogFragment	A fragment that displays a dialog window, floating on top of its activity's window.
DownloadManager	The download manager is a system service that handles long-running HTTP downloads.
DownloadManager.Query	This class may be used to filter download manager queries.
DownloadManager.Request	This class contains all the information necessary to request a new download.
ExpandableListActivity	An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item.
Fragment	A Fragment is a piece of an application's user interface or behavior that can be placed in an Activity.
Fragment.SavedState	State information that has been retrieved from a fragment instance through FragmentManager.saveFragmentInstanceState.
FragmentBreadCrumbs	This class was deprecated in API level 21. This widget is no longer supported.
FragmentContainer	Callbacks to a Fragment's container.
FragmentController	Provides integration points with a FragmentManager for a fragment host.
FragmentHostCallback<E>	Integration points with the Fragment host.
FragmentManager	Interface for interacting with Fragment objects inside of an Activity Developer Guides For more information about using fragments, read the Fragments developer guide.
FragmentManagerNonConfig	FragmentManagerNonConfig stores the retained instance fragments across activity recreation events.
FragmentTransaction	API for performing a set of Fragment operations.
Instrumentation	Base class for implementing application instrumentation code.
Instrumentation.ActivityMonitor	Information about a particular kind of Intent that is being monitored.
Instrumentation.ActivityResult	Description of a Activity execution result to return to the original activity.
IntentService	IntentService is a base class for Services that handle asynchronous requests (expressed as Intents) on demand.
KeyguardManager	Class that can be used to lock and unlock the keyboard.
KeyguardManager.KeyguardLock	This class was deprecated in API level 13. Use FLAG_DISMISS_KEYGUARD and/or FLAG_SHOW_WHEN_LOCKED instead; this allows you to seamlessly hide the keyguard as your application moves in and out of the foreground and does not require that any special permissions be requested. Handle returned by newKeyguardLock(String) that allows you to disable / reenable the keyguard.
LauncherActivity	Displays a list of all activities which can be performed for a given intent.
LauncherActivity.IconResizer	Utility class to resize icons to match default icon size.
LauncherActivity.ListItem	An item in the list
ListActivity	An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item.
ListFragment	A fragment that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item.
LoaderManager	Interface associated with an Activity or Fragment for managing one or more Loader instances associated with it.
LocalActivityManager	This class was deprecated in API level 13. Use the new Fragment and FragmentManager APIs instead; these are also available on older platforms through the Android compatibility package.
MediaRouteActionProvider	The media route action provider displays a media route button in the application's ActionBar to allow the user to select routes and to control the currently selected route.
MediaRouteButton
NativeActivity	Convenience for implementing an activity that will be implemented purely in native code.
Notification	A class that represents how a persistent notification is to be presented to the user using the NotificationManager.
Notification.Action	Structure to encapsulate a named action that can be shown as part of this notification.
Notification.Action.Builder	Builder class for Notification.Action objects.
Notification.Action.WearableExtender	Wearable extender for notification actions.
Notification.BigPictureStyle	Helper class for generating large-format notifications that include a large image attachment.
Notification.BigTextStyle	Helper class for generating large-format notifications that include a lot of text.
Notification.Builder	Builder class for Notification objects.
Notification.CarExtender	Helper class to add Android Auto extensions to notifications.
Notification.CarExtender.Builder	Builder class for Notification.CarExtender.UnreadConversation objects.
Notification.CarExtender.UnreadConversation	A class which holds the unread messages from a conversation.
Notification.DecoratedCustomViewStyle	Notification style for custom views that are decorated by the system Instead of providing a notification that is completely custom, a developer can set this style and still obtain system decorations like the notification header with the expand affordance and actions.
Notification.DecoratedMediaCustomViewStyle	Notification style for media custom views that are decorated by the system Instead of providing a media notification that is completely custom, a developer can set this style and still obtain system decorations like the notification header with the expand affordance and actions.
Notification.InboxStyle	Helper class for generating large-format notifications that include a list of (up to 5) strings.
Notification.MediaStyle	Notification style for media playback notifications.
Notification.MessagingStyle	Helper class for generating large-format notifications that include multiple back-and-forth messages of varying types between any number of people.
Notification.MessagingStyle.Message
Notification.Style	An object that can apply a rich notification style to a Notification.Builder object.
Notification.WearableExtender	Helper class to add wearable extensions to notifications.
NotificationManager	Class to notify the user of events that happen. This is how you tell the user that something has happened in the background.
NotificationManager.Policy	Notification policy configuration.
PendingIntent	A description of an Intent and target action to perform with it.
Presentation	Base class for presentations.
ProgressDialog	A dialog showing a progress indicator and an optional text message or view.
RemoteInput	A RemoteInput object specifies input to be collected from a user to be passed along with an intent inside a PendingIntent that is sent.
RemoteInput.Builder	Builder class for RemoteInput objects.
SearchableInfo	Searchability meta-data for an activity.
SearchManager	This class provides access to the system search services.
Service	A Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use.
SharedElementCallback	Listener provided in setEnterSharedElementCallback(SharedElementCallback) and setExitSharedElementCallback(SharedElementCallback) as well as setEnterSharedElementCallback(SharedElementCallback) and setExitSharedElementCallback(SharedElementCallback) to monitor the Shared element transitions.
TabActivity	This class was deprecated in API level 13. New applications should use Fragments instead of this class; to continue to run on older devices, you can use the v4 support library which provides a version of the Fragment API that is compatible down to DONUT.
TaskStackBuilder	Utility class for constructing synthetic back stacks for cross-task navigation on Android 3.0 and newer.
TimePickerDialog	A dialog that prompts the user for the time of day using a TimePicker.
UiAutomation	Class for interacting with the device's UI by simulation user actions and introspection of the screen content.
UiModeManager	This class provides access to the system uimode services.
VoiceInteractor	Interface for an Activity to interact with the user through voice.
VoiceInteractor.AbortVoiceRequest	Reports that the current interaction can not be complete with voice, so the application will need to switch to a traditional input UI.
VoiceInteractor.CommandRequest	Execute a vendor-specific command using the trusted system VoiceInteractionService.
VoiceInteractor.CompleteVoiceRequest	Reports that the current interaction was successfully completed with voice, so the application can report the final status to the user.
VoiceInteractor.ConfirmationRequest	Confirms an operation with the user via the trusted system VoiceInteractionService.
VoiceInteractor.PickOptionRequest	Select a single option from multiple potential options with the user via the trusted system VoiceInteractionService.
VoiceInteractor.PickOptionRequest.Option	Represents a single option that the user may select using their voice.
VoiceInteractor.Prompt	A set of voice prompts to use with the voice interaction system to confirm an action, select an option, or do similar operations.
VoiceInteractor.Request	Base class for voice interaction requests that can be submitted to the interactor.
WallpaperInfo	This class is used to specify meta information of a wallpaper service.
WallpaperManager	Provides access to the system wallpaper.

Exceptions

Fragment.InstantiationException	Thrown by instantiate(Context, String, Bundle) when there is an instantiation failure.
PendingIntent.CanceledException	Exception thrown when trying to send through a PendingIntent that has been canceled or is otherwise no longer able to execute the request.