/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.app; import android.animation.Animator; import android.annotation.CallSuper; import android.annotation.NonNull; import android.annotation.Nullable; import android.annotation.StringRes; import android.content.ComponentCallbacks2; import android.content.Context; import android.content.Intent; import android.content.IntentSender; import android.content.res.Configuration; import android.content.res.Resources; import android.content.res.TypedArray; import android.os.Build; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.os.Parcel; import android.os.Parcelable; import android.transition.Transition; import android.transition.TransitionInflater; import android.transition.TransitionSet; import android.util.AndroidRuntimeException; import android.util.ArrayMap; import android.util.AttributeSet; import android.util.DebugUtils; import android.util.Log; import android.util.SparseArray; import android.util.SuperNotCalledException; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.View.OnCreateContextMenuListener; import android.view.ViewGroup; import android.widget.AdapterView; import java.io.FileDescriptor; import java.io.PrintWriter; final class FragmentState implements Parcelable { final String mClassName; final int mIndex; final boolean mFromLayout; final int mFragmentId; final int mContainerId; final String mTag; final boolean mRetainInstance; final boolean mDetached; final Bundle mArguments; final boolean mHidden; Bundle mSavedFragmentState; Fragment mInstance; public FragmentState(Fragment frag) { mClassName = frag.getClass().getName(); mIndex = frag.mIndex; mFromLayout = frag.mFromLayout; mFragmentId = frag.mFragmentId; mContainerId = frag.mContainerId; mTag = frag.mTag; mRetainInstance = frag.mRetainInstance; mDetached = frag.mDetached; mArguments = frag.mArguments; mHidden = frag.mHidden; } public FragmentState(Parcel in) { mClassName = in.readString(); mIndex = in.readInt(); mFromLayout = in.readInt() != 0; mFragmentId = in.readInt(); mContainerId = in.readInt(); mTag = in.readString(); mRetainInstance = in.readInt() != 0; mDetached = in.readInt() != 0; mArguments = in.readBundle(); mHidden = in.readInt() != 0; mSavedFragmentState = in.readBundle(); } public Fragment instantiate(FragmentHostCallback host, Fragment parent, FragmentManagerNonConfig childNonConfig) { if (mInstance == null) { final Context context = host.getContext(); if (mArguments != null) { mArguments.setClassLoader(context.getClassLoader()); } mInstance = Fragment.instantiate(context, mClassName, mArguments); if (mSavedFragmentState != null) { mSavedFragmentState.setClassLoader(context.getClassLoader()); mInstance.mSavedFragmentState = mSavedFragmentState; } mInstance.setIndex(mIndex, parent); mInstance.mFromLayout = mFromLayout; mInstance.mRestored = true; mInstance.mFragmentId = mFragmentId; mInstance.mContainerId = mContainerId; mInstance.mTag = mTag; mInstance.mRetainInstance = mRetainInstance; mInstance.mDetached = mDetached; mInstance.mHidden = mHidden; mInstance.mFragmentManager = host.mFragmentManager; if (FragmentManagerImpl.DEBUG) Log.v(FragmentManagerImpl.TAG, "Instantiated fragment " + mInstance); } mInstance.mChildNonConfig = childNonConfig; return mInstance; } public int describeContents() { return 0; } public void writeToParcel(Parcel dest, int flags) { dest.writeString(mClassName); dest.writeInt(mIndex); dest.writeInt(mFromLayout ? 1 : 0); dest.writeInt(mFragmentId); dest.writeInt(mContainerId); dest.writeString(mTag); dest.writeInt(mRetainInstance ? 1 : 0); dest.writeInt(mDetached ? 1 : 0); dest.writeBundle(mArguments); dest.writeInt(mHidden ? 1 : 0); dest.writeBundle(mSavedFragmentState); } public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { public FragmentState createFromParcel(Parcel in) { return new FragmentState(in); } public FragmentState[] newArray(int size) { return new FragmentState[size]; } }; } /** * A Fragment is a piece of an application's user interface or behavior * that can be placed in an {@link Activity}. Interaction with fragments * is done through {@link FragmentManager}, which can be obtained via * {@link Activity#getFragmentManager() Activity.getFragmentManager()} and * {@link Fragment#getFragmentManager() Fragment.getFragmentManager()}. * *

The Fragment class can be used many ways to achieve a wide variety of * results. In its core, it represents a particular operation or interface * that is running within a larger {@link Activity}. A Fragment is closely * tied to the Activity it is in, and can not be used apart from one. Though * Fragment defines its own lifecycle, that lifecycle is dependent on its * activity: if the activity is stopped, no fragments inside of it can be * started; when the activity is destroyed, all fragments will be destroyed. * *

All subclasses of Fragment must include a public no-argument constructor. * The framework will often re-instantiate a fragment class when needed, * in particular during state restore, and needs to be able to find this * constructor to instantiate it. If the no-argument constructor is not * available, a runtime exception will occur in some cases during state * restore. * *

Topics covered here: *

    *
  1. Older Platforms *
  2. Lifecycle *
  3. Layout *
  4. Back Stack *
* *
*

Developer Guides

*

For more information about using fragments, read the * Fragments developer guide.

*
* * *

Older Platforms

* * While the Fragment API was introduced in * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, a version of the API * at is also available for use on older platforms through * {@link android.support.v4.app.FragmentActivity}. See the blog post * * Fragments For All for more details. * * *

Lifecycle

* *

Though a Fragment's lifecycle is tied to its owning activity, it has * its own wrinkle on the standard activity lifecycle. It includes basic * activity lifecycle methods such as {@link #onResume}, but also important * are methods related to interactions with the activity and UI generation. * *

The core series of lifecycle methods that are called to bring a fragment * up to resumed state (interacting with the user) are: * *

    *
  1. {@link #onAttach} called once the fragment is associated with its activity. *
  2. {@link #onCreate} called to do initial creation of the fragment. *
  3. {@link #onCreateView} creates and returns the view hierarchy associated * with the fragment. *
  4. {@link #onActivityCreated} tells the fragment that its activity has * completed its own {@link Activity#onCreate Activity.onCreate()}. *
  5. {@link #onViewStateRestored} tells the fragment that all of the saved * state of its view hierarchy has been restored. *
  6. {@link #onStart} makes the fragment visible to the user (based on its * containing activity being started). *
  7. {@link #onResume} makes the fragment begin interacting with the user * (based on its containing activity being resumed). *
* *

As a fragment is no longer being used, it goes through a reverse * series of callbacks: * *

    *
  1. {@link #onPause} fragment is no longer interacting with the user either * because its activity is being paused or a fragment operation is modifying it * in the activity. *
  2. {@link #onStop} fragment is no longer visible to the user either * because its activity is being stopped or a fragment operation is modifying it * in the activity. *
  3. {@link #onDestroyView} allows the fragment to clean up resources * associated with its View. *
  4. {@link #onDestroy} called to do final cleanup of the fragment's state. *
  5. {@link #onDetach} called immediately prior to the fragment no longer * being associated with its activity. *
* * *

Layout

* *

Fragments can be used as part of your application's layout, allowing * you to better modularize your code and more easily adjust your user * interface to the screen it is running on. As an example, we can look * at a simple program consisting of a list of items, and display of the * details of each item.

* *

An activity's layout XML can include <fragment> tags * to embed fragment instances inside of the layout. For example, here is * a simple layout that embeds one fragment:

* * {@sample development/samples/ApiDemos/res/layout/fragment_layout.xml layout} * *

The layout is installed in the activity in the normal way:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java * main} * *

The titles fragment, showing a list of titles, is fairly simple, relying * on {@link ListFragment} for most of its work. Note the implementation of * clicking an item: depending on the current activity's layout, it can either * create and display a new fragment to show the details in-place (more about * this later), or start a new activity to show the details.

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java * titles} * *

The details fragment showing the contents of a selected item just * displays a string of text based on an index of a string array built in to * the app:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java * details} * *

In this case when the user clicks on a title, there is no details * container in the current activity, so the titles fragment's click code will * launch a new activity to display the details fragment:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentLayout.java * details_activity} * *

However the screen may be large enough to show both the list of titles * and details about the currently selected title. To use such a layout on * a landscape screen, this alternative layout can be placed under layout-land:

* * {@sample development/samples/ApiDemos/res/layout-land/fragment_layout.xml layout} * *

Note how the prior code will adjust to this alternative UI flow: the titles * fragment will now embed the details fragment inside of this activity, and the * details activity will finish itself if it is running in a configuration * where the details can be shown in-place. * *

When a configuration change causes the activity hosting these fragments * to restart, its new instance may use a different layout that doesn't * include the same fragments as the previous layout. In this case all of * the previous fragments will still be instantiated and running in the new * instance. However, any that are no longer associated with a <fragment> * tag in the view hierarchy will not have their content view created * and will return false from {@link #isInLayout}. (The code here also shows * how you can determine if a fragment placed in a container is no longer * running in a layout with that container and avoid creating its view hierarchy * in that case.) * *

The attributes of the <fragment> tag are used to control the * LayoutParams provided when attaching the fragment's view to the parent * container. They can also be parsed by the fragment in {@link #onInflate} * as parameters. * *

The fragment being instantiated must have some kind of unique identifier * so that it can be re-associated with a previous instance if the parent * activity needs to be destroyed and recreated. This can be provided these * ways: * *

* * *

Back Stack

* *

The transaction in which fragments are modified can be placed on an * internal back-stack of the owning activity. When the user presses back * in the activity, any transactions on the back stack are popped off before * the activity itself is finished. * *

For example, consider this simple fragment that is instantiated with * an integer argument and displays that in a TextView in its UI:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java * fragment} * *

A function that creates a new instance of the fragment, replacing * whatever current fragment instance is being shown and pushing that change * on to the back stack could be written as: * * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentStack.java * add_stack} * *

After each call to this function, a new entry is on the stack, and * pressing back will pop it to return the user to whatever previous state * the activity UI was in. */ public class Fragment implements ComponentCallbacks2, OnCreateContextMenuListener { private static final ArrayMap> sClassMap = new ArrayMap>(); static final int INVALID_STATE = -1; // Invalid state used as a null value. static final int INITIALIZING = 0; // Not yet created. static final int CREATED = 1; // Created. static final int ACTIVITY_CREATED = 2; // The activity has finished its creation. static final int STOPPED = 3; // Fully created, not started. static final int STARTED = 4; // Created and started, not resumed. static final int RESUMED = 5; // Created started and resumed. private static final Transition USE_DEFAULT_TRANSITION = new TransitionSet(); int mState = INITIALIZING; // Non-null if the fragment's view hierarchy is currently animating away, // meaning we need to wait a bit on completely destroying it. This is the // animation that is running. Animator mAnimatingAway; // If mAnimatingAway != null, this is the state we should move to once the // animation is done. int mStateAfterAnimating; // When instantiated from saved state, this is the saved state. Bundle mSavedFragmentState; SparseArray mSavedViewState; // Index into active fragment array. int mIndex = -1; // Internal unique name for this fragment; String mWho; // Construction arguments; Bundle mArguments; // Target fragment. Fragment mTarget; // For use when retaining a fragment: this is the index of the last mTarget. int mTargetIndex = -1; // Target request code. int mTargetRequestCode; // True if the fragment is in the list of added fragments. boolean mAdded; // If set this fragment is being removed from its activity. boolean mRemoving; // Set to true if this fragment was instantiated from a layout file. boolean mFromLayout; // Set to true when the view has actually been inflated in its layout. boolean mInLayout; // True if this fragment has been restored from previously saved state. boolean mRestored; // Number of active back stack entries this fragment is in. int mBackStackNesting; // The fragment manager we are associated with. Set as soon as the // fragment is used in a transaction; cleared after it has been removed // from all transactions. FragmentManagerImpl mFragmentManager; // Activity this fragment is attached to. FragmentHostCallback mHost; // Private fragment manager for child fragments inside of this one. FragmentManagerImpl mChildFragmentManager; // For use when restoring fragment state and descendant fragments are retained. // This state is set by FragmentState.instantiate and cleared in onCreate. FragmentManagerNonConfig mChildNonConfig; // If this Fragment is contained in another Fragment, this is that container. Fragment mParentFragment; // The optional identifier for this fragment -- either the container ID if it // was dynamically added to the view hierarchy, or the ID supplied in // layout. int mFragmentId; // When a fragment is being dynamically added to the view hierarchy, this // is the identifier of the parent container it is being added to. int mContainerId; // The optional named tag for this fragment -- usually used to find // fragments that are not part of the layout. String mTag; // Set to true when the app has requested that this fragment be hidden // from the user. boolean mHidden; // Set to true when the app has requested that this fragment be detached. boolean mDetached; // If set this fragment would like its instance retained across // configuration changes. boolean mRetainInstance; // If set this fragment is being retained across the current config change. boolean mRetaining; // If set this fragment has menu items to contribute. boolean mHasMenu; // Set to true to allow the fragment's menu to be shown. boolean mMenuVisible = true; // Used to verify that subclasses call through to super class. boolean mCalled; // If app has requested a specific animation, this is the one to use. int mNextAnim; // The parent container of the fragment after dynamically added to UI. ViewGroup mContainer; // The View generated for this fragment. View mView; // Whether this fragment should defer starting until after other fragments // have been started and their loaders are finished. boolean mDeferStart; // Hint provided by the app that this fragment is currently visible to the user. boolean mUserVisibleHint = true; LoaderManagerImpl mLoaderManager; boolean mLoadersStarted; boolean mCheckedForLoaderManager; private Transition mEnterTransition = null; private Transition mReturnTransition = USE_DEFAULT_TRANSITION; private Transition mExitTransition = null; private Transition mReenterTransition = USE_DEFAULT_TRANSITION; private Transition mSharedElementEnterTransition = null; private Transition mSharedElementReturnTransition = USE_DEFAULT_TRANSITION; private Boolean mAllowReturnTransitionOverlap; private Boolean mAllowEnterTransitionOverlap; SharedElementCallback mEnterTransitionCallback = SharedElementCallback.NULL_CALLBACK; SharedElementCallback mExitTransitionCallback = SharedElementCallback.NULL_CALLBACK; /** * State information that has been retrieved from a fragment instance * through {@link FragmentManager#saveFragmentInstanceState(Fragment) * FragmentManager.saveFragmentInstanceState}. */ public static class SavedState implements Parcelable { final Bundle mState; SavedState(Bundle state) { mState = state; } SavedState(Parcel in, ClassLoader loader) { mState = in.readBundle(); if (loader != null && mState != null) { mState.setClassLoader(loader); } } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeBundle(mState); } public static final Parcelable.ClassLoaderCreator CREATOR = new Parcelable.ClassLoaderCreator() { public SavedState createFromParcel(Parcel in) { return new SavedState(in, null); } public SavedState createFromParcel(Parcel in, ClassLoader loader) { return new SavedState(in, loader); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; } /** * Thrown by {@link Fragment#instantiate(Context, String, Bundle)} when * there is an instantiation failure. */ static public class InstantiationException extends AndroidRuntimeException { public InstantiationException(String msg, Exception cause) { super(msg, cause); } } /** * Default constructor. Every fragment must have an * empty constructor, so it can be instantiated when restoring its * activity's state. It is strongly recommended that subclasses do not * have other constructors with parameters, since these constructors * will not be called when the fragment is re-instantiated; instead, * arguments can be supplied by the caller with {@link #setArguments} * and later retrieved by the Fragment with {@link #getArguments}. * *

Applications should generally not implement a constructor. The * first place application code can run where the fragment is ready to * be used is in {@link #onAttach(Activity)}, the point where the fragment * is actually associated with its activity. Some applications may also * want to implement {@link #onInflate} to retrieve attributes from a * layout resource, though should take care here because this happens for * the fragment is attached to its activity. */ public Fragment() { } /** * Like {@link #instantiate(Context, String, Bundle)} but with a null * argument Bundle. */ public static Fragment instantiate(Context context, String fname) { return instantiate(context, fname, null); } /** * Create a new instance of a Fragment with the given class name. This is * the same as calling its empty constructor. * * @param context The calling context being used to instantiate the fragment. * This is currently just used to get its ClassLoader. * @param fname The class name of the fragment to instantiate. * @param args Bundle of arguments to supply to the fragment, which it * can retrieve with {@link #getArguments()}. May be null. * @return Returns a new fragment instance. * @throws InstantiationException If there is a failure in instantiating * the given fragment class. This is a runtime exception; it is not * normally expected to happen. */ public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) { try { Class clazz = sClassMap.get(fname); if (clazz == null) { // Class not found in the cache, see if it's real, and try to add it clazz = context.getClassLoader().loadClass(fname); if (!Fragment.class.isAssignableFrom(clazz)) { throw new InstantiationException("Trying to instantiate a class " + fname + " that is not a Fragment", new ClassCastException()); } sClassMap.put(fname, clazz); } Fragment f = (Fragment)clazz.newInstance(); if (args != null) { args.setClassLoader(f.getClass().getClassLoader()); f.mArguments = args; } return f; } catch (ClassNotFoundException e) { throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an" + " empty constructor that is public", e); } catch (java.lang.InstantiationException e) { throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an" + " empty constructor that is public", e); } catch (IllegalAccessException e) { throw new InstantiationException("Unable to instantiate fragment " + fname + ": make sure class name exists, is public, and has an" + " empty constructor that is public", e); } } final void restoreViewState(Bundle savedInstanceState) { if (mSavedViewState != null) { mView.restoreHierarchyState(mSavedViewState); mSavedViewState = null; } mCalled = false; onViewStateRestored(savedInstanceState); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onViewStateRestored()"); } } final void setIndex(int index, Fragment parent) { mIndex = index; if (parent != null) { mWho = parent.mWho + ":" + mIndex; } else { mWho = "android:fragment:" + mIndex; } } final boolean isInBackStack() { return mBackStackNesting > 0; } /** * Subclasses can not override equals(). */ @Override final public boolean equals(Object o) { return super.equals(o); } /** * Subclasses can not override hashCode(). */ @Override final public int hashCode() { return super.hashCode(); } @Override public String toString() { StringBuilder sb = new StringBuilder(128); DebugUtils.buildShortClassTag(this, sb); if (mIndex >= 0) { sb.append(" #"); sb.append(mIndex); } if (mFragmentId != 0) { sb.append(" id=0x"); sb.append(Integer.toHexString(mFragmentId)); } if (mTag != null) { sb.append(" "); sb.append(mTag); } sb.append('}'); return sb.toString(); } /** * Return the identifier this fragment is known by. This is either * the android:id value supplied in a layout or the container view ID * supplied when adding the fragment. */ final public int getId() { return mFragmentId; } /** * Get the tag name of the fragment, if specified. */ final public String getTag() { return mTag; } /** * Supply the construction arguments for this fragment. This can only * be called before the fragment has been attached to its activity; that * is, you should call it immediately after constructing the fragment. The * arguments supplied here will be retained across fragment destroy and * creation. */ public void setArguments(Bundle args) { if (mIndex >= 0) { throw new IllegalStateException("Fragment already active"); } mArguments = args; } /** * Return the arguments supplied to {@link #setArguments}, if any. */ final public Bundle getArguments() { return mArguments; } /** * Set the initial saved state that this Fragment should restore itself * from when first being constructed, as returned by * {@link FragmentManager#saveFragmentInstanceState(Fragment) * FragmentManager.saveFragmentInstanceState}. * * @param state The state the fragment should be restored from. */ public void setInitialSavedState(SavedState state) { if (mIndex >= 0) { throw new IllegalStateException("Fragment already active"); } mSavedFragmentState = state != null && state.mState != null ? state.mState : null; } /** * Optional target for this fragment. This may be used, for example, * if this fragment is being started by another, and when done wants to * give a result back to the first. The target set here is retained * across instances via {@link FragmentManager#putFragment * FragmentManager.putFragment()}. * * @param fragment The fragment that is the target of this one. * @param requestCode Optional request code, for convenience if you * are going to call back with {@link #onActivityResult(int, int, Intent)}. */ public void setTargetFragment(Fragment fragment, int requestCode) { mTarget = fragment; mTargetRequestCode = requestCode; } /** * Return the target fragment set by {@link #setTargetFragment}. */ final public Fragment getTargetFragment() { return mTarget; } /** * Return the target request code set by {@link #setTargetFragment}. */ final public int getTargetRequestCode() { return mTargetRequestCode; } /** * Return the {@link Context} this fragment is currently associated with. */ public Context getContext() { return mHost == null ? null : mHost.getContext(); } /** * Return the Activity this fragment is currently associated with. */ final public Activity getActivity() { return mHost == null ? null : mHost.getActivity(); } /** * Return the host object of this fragment. May return {@code null} if the fragment * isn't currently being hosted. */ @Nullable final public Object getHost() { return mHost == null ? null : mHost.onGetHost(); } /** * Return getActivity().getResources(). */ final public Resources getResources() { if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } return mHost.getContext().getResources(); } /** * Return a localized, styled CharSequence from the application's package's * default string table. * * @param resId Resource id for the CharSequence text */ public final CharSequence getText(@StringRes int resId) { return getResources().getText(resId); } /** * Return a localized string from the application's package's * default string table. * * @param resId Resource id for the string */ public final String getString(@StringRes int resId) { return getResources().getString(resId); } /** * Return a localized formatted string from the application's package's * default string table, substituting the format arguments as defined in * {@link java.util.Formatter} and {@link java.lang.String#format}. * * @param resId Resource id for the format string * @param formatArgs The format arguments that will be used for substitution. */ public final String getString(@StringRes int resId, Object... formatArgs) { return getResources().getString(resId, formatArgs); } /** * Return the FragmentManager for interacting with fragments associated * with this fragment's activity. Note that this will be non-null slightly * before {@link #getActivity()}, during the time from when the fragment is * placed in a {@link FragmentTransaction} until it is committed and * attached to its activity. * *

If this Fragment is a child of another Fragment, the FragmentManager * returned here will be the parent's {@link #getChildFragmentManager()}. */ final public FragmentManager getFragmentManager() { return mFragmentManager; } /** * Return a private FragmentManager for placing and managing Fragments * inside of this Fragment. */ final public FragmentManager getChildFragmentManager() { if (mChildFragmentManager == null) { instantiateChildFragmentManager(); if (mState >= RESUMED) { mChildFragmentManager.dispatchResume(); } else if (mState >= STARTED) { mChildFragmentManager.dispatchStart(); } else if (mState >= ACTIVITY_CREATED) { mChildFragmentManager.dispatchActivityCreated(); } else if (mState >= CREATED) { mChildFragmentManager.dispatchCreate(); } } return mChildFragmentManager; } /** * Returns the parent Fragment containing this Fragment. If this Fragment * is attached directly to an Activity, returns null. */ final public Fragment getParentFragment() { return mParentFragment; } /** * Return true if the fragment is currently added to its activity. */ final public boolean isAdded() { return mHost != null && mAdded; } /** * Return true if the fragment has been explicitly detached from the UI. * That is, {@link FragmentTransaction#detach(Fragment) * FragmentTransaction.detach(Fragment)} has been used on it. */ final public boolean isDetached() { return mDetached; } /** * Return true if this fragment is currently being removed from its * activity. This is not whether its activity is finishing, but * rather whether it is in the process of being removed from its activity. */ final public boolean isRemoving() { return mRemoving; } /** * Return true if the layout is included as part of an activity view * hierarchy via the <fragment> tag. This will always be true when * fragments are created through the <fragment> tag, except * in the case where an old fragment is restored from a previous state and * it does not appear in the layout of the current state. */ final public boolean isInLayout() { return mInLayout; } /** * Return true if the fragment is in the resumed state. This is true * for the duration of {@link #onResume()} and {@link #onPause()} as well. */ final public boolean isResumed() { return mState >= RESUMED; } /** * Return true if the fragment is currently visible to the user. This means * it: (1) has been added, (2) has its view attached to the window, and * (3) is not hidden. */ final public boolean isVisible() { return isAdded() && !isHidden() && mView != null && mView.getWindowToken() != null && mView.getVisibility() == View.VISIBLE; } /** * Return true if the fragment has been hidden. By default fragments * are shown. You can find out about changes to this state with * {@link #onHiddenChanged}. Note that the hidden state is orthogonal * to other states -- that is, to be visible to the user, a fragment * must be both started and not hidden. */ final public boolean isHidden() { return mHidden; } /** * Called when the hidden state (as returned by {@link #isHidden()} of * the fragment has changed. Fragments start out not hidden; this will * be called whenever the fragment changes state from that. * @param hidden True if the fragment is now hidden, false if it is not * visible. */ public void onHiddenChanged(boolean hidden) { } /** * Control whether a fragment instance is retained across Activity * re-creation (such as from a configuration change). This can only * be used with fragments not in the back stack. If set, the fragment * lifecycle will be slightly different when an activity is recreated: *

*/ public void setRetainInstance(boolean retain) { mRetainInstance = retain; } final public boolean getRetainInstance() { return mRetainInstance; } /** * Report that this fragment would like to participate in populating * the options menu by receiving a call to {@link #onCreateOptionsMenu} * and related methods. * * @param hasMenu If true, the fragment has menu items to contribute. */ public void setHasOptionsMenu(boolean hasMenu) { if (mHasMenu != hasMenu) { mHasMenu = hasMenu; if (isAdded() && !isHidden()) { mFragmentManager.invalidateOptionsMenu(); } } } /** * Set a hint for whether this fragment's menu should be visible. This * is useful if you know that a fragment has been placed in your view * hierarchy so that the user can not currently seen it, so any menu items * it has should also not be shown. * * @param menuVisible The default is true, meaning the fragment's menu will * be shown as usual. If false, the user will not see the menu. */ public void setMenuVisibility(boolean menuVisible) { if (mMenuVisible != menuVisible) { mMenuVisible = menuVisible; if (mHasMenu && isAdded() && !isHidden()) { mFragmentManager.invalidateOptionsMenu(); } } } /** * Set a hint to the system about whether this fragment's UI is currently visible * to the user. This hint defaults to true and is persistent across fragment instance * state save and restore. * *

An app may set this to false to indicate that the fragment's UI is * scrolled out of visibility or is otherwise not directly visible to the user. * This may be used by the system to prioritize operations such as fragment lifecycle updates * or loader ordering behavior.

* *

Note: Prior to Android N there was a platform bug that could cause * setUserVisibleHint to bring a fragment up to the started state before its * FragmentTransaction had been committed. As some apps relied on this behavior, * it is preserved for apps that declare a targetSdkVersion of 23 or lower.

* * @param isVisibleToUser true if this fragment's UI is currently visible to the user (default), * false if it is not. */ public void setUserVisibleHint(boolean isVisibleToUser) { // Prior to Android N we were simply checking if this fragment had a FragmentManager // set before we would trigger a deferred start. Unfortunately this also gets set before // a fragment transaction is committed, so if setUserVisibleHint was called before a // transaction commit, we would start the fragment way too early. FragmentPagerAdapter // triggers this situation. // Unfortunately some apps relied on this timing in overrides of setUserVisibleHint // on their own fragments, and expected, however erroneously, that after a call to // super.setUserVisibleHint their onStart methods had been run. // We preserve this behavior for apps targeting old platform versions below. boolean useBrokenAddedCheck = false; Context context = getContext(); if (mFragmentManager != null && mFragmentManager.mHost != null) { context = mFragmentManager.mHost.getContext(); } if (context != null) { useBrokenAddedCheck = context.getApplicationInfo().targetSdkVersion <= VERSION_CODES.M; } final boolean performDeferredStart; if (useBrokenAddedCheck) { performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED && mFragmentManager != null; } else { performDeferredStart = !mUserVisibleHint && isVisibleToUser && mState < STARTED && mFragmentManager != null && isAdded(); } if (performDeferredStart) { mFragmentManager.performPendingDeferredStart(this); } mUserVisibleHint = isVisibleToUser; mDeferStart = mState < STARTED && !isVisibleToUser; } /** * @return The current value of the user-visible hint on this fragment. * @see #setUserVisibleHint(boolean) */ public boolean getUserVisibleHint() { return mUserVisibleHint; } /** * Return the LoaderManager for this fragment, creating it if needed. */ public LoaderManager getLoaderManager() { if (mLoaderManager != null) { return mLoaderManager; } if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } mCheckedForLoaderManager = true; mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, true); return mLoaderManager; } /** * Call {@link Activity#startActivity(Intent)} from the fragment's * containing Activity. * * @param intent The intent to start. */ public void startActivity(Intent intent) { startActivity(intent, null); } /** * Call {@link Activity#startActivity(Intent, Bundle)} from the fragment's * containing Activity. * * @param intent The intent to start. * @param options Additional options for how the Activity should be started. * See {@link android.content.Context#startActivity(Intent, Bundle) * Context.startActivity(Intent, Bundle)} for more details. */ public void startActivity(Intent intent, Bundle options) { if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } if (options != null) { mHost.onStartActivityFromFragment(this, intent, -1, options); } else { // Note we want to go through this call for compatibility with // applications that may have overridden the method. mHost.onStartActivityFromFragment(this, intent, -1, null /*options*/); } } /** * Call {@link Activity#startActivityForResult(Intent, int)} from the fragment's * containing Activity. */ public void startActivityForResult(Intent intent, int requestCode) { startActivityForResult(intent, requestCode, null); } /** * Call {@link Activity#startActivityForResult(Intent, int, Bundle)} from the fragment's * containing Activity. */ public void startActivityForResult(Intent intent, int requestCode, Bundle options) { if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } mHost.onStartActivityFromFragment(this, intent, requestCode, options); } /** * Call {@link Activity#startIntentSenderForResult(IntentSender, int, Intent, int, int, int, * Bundle)} from the fragment's containing Activity. */ public void startIntentSenderForResult(IntentSender intent, int requestCode, @Nullable Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options) throws IntentSender.SendIntentException { if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } mHost.onStartIntentSenderFromFragment(this, intent, requestCode, fillInIntent, flagsMask, flagsValues, extraFlags, options); } /** * Receive the result from a previous call to * {@link #startActivityForResult(Intent, int)}. This follows the * related Activity API as described there in * {@link Activity#onActivityResult(int, int, Intent)}. * * @param requestCode The integer request code originally supplied to * startActivityForResult(), allowing you to identify who this * result came from. * @param resultCode The integer result code returned by the child activity * through its setResult(). * @param data An Intent, which can return result data to the caller * (various data can be attached to Intent "extras"). */ public void onActivityResult(int requestCode, int resultCode, Intent data) { } /** * 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 {@link android.content.pm.PermissionInfo * #PROTECTION_DANGEROUS dangerous}, regardless whether they are declared by * the platform or a third-party app. *

* Normal permissions {@link android.content.pm.PermissionInfo#PROTECTION_NORMAL} * are granted at install time if requested in the manifest. Signature permissions * {@link android.content.pm.PermissionInfo#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 {@link * #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 {@link * #onRequestPermissionsResult(int, String[], int[])}. *

*

* When checking whether you have a permission you should use {@link * android.content.Context#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 {@link * android.R.styleable#AndroidManifestActivity_noHistory noHistory} to * true because in this case the activity would not receive * result callbacks including {@link #onRequestPermissionsResult(int, String[], int[])}. *

*

* A sample permissions request looks like this: *

* 

     * private void showContacts() {
     *     if (getActivity().checkSelfPermission(Manifest.permission.READ_CONTACTS)
     *             != PackageManager.PERMISSION_GRANTED) {
     *         requestPermissions(new String[]{Manifest.permission.READ_CONTACTS},
     *                 PERMISSIONS_REQUEST_READ_CONTACTS);
     *     } else {
     *         doShowContacts();
     *     }
     * }
     *
     * {@literal @}Override
     * public void onRequestPermissionsResult(int requestCode, String[] permissions,
     *         int[] grantResults) {
     *     if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS
     *             && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
     *         doShowContacts();
     *     }
     * }
     *

* * @param permissions The requested permissions. Must me non-null and not empty. * @param requestCode Application specific request code to match with a result * reported to {@link #onRequestPermissionsResult(int, String[], int[])}. * Should be >= 0. * * @see #onRequestPermissionsResult(int, String[], int[]) * @see android.content.Context#checkSelfPermission(String) */ public final void requestPermissions(@NonNull String[] permissions, int requestCode) { if (mHost == null) { throw new IllegalStateException("Fragment " + this + " not attached to Activity"); } mHost.onRequestPermissionsFromFragment(this, permissions,requestCode); } /** * Callback for the result from requesting permissions. This method * is invoked for every call on {@link #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. *

* * @param requestCode The request code passed in {@link #requestPermissions(String[], int)}. * @param permissions The requested permissions. Never null. * @param grantResults The grant results for the corresponding permissions * which is either {@link android.content.pm.PackageManager#PERMISSION_GRANTED} * or {@link android.content.pm.PackageManager#PERMISSION_DENIED}. Never null. * * @see #requestPermissions(String[], int) */ public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { /* callback - do nothing */ } /** * 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. *

* * @param permission A permission your app wants to request. * @return Whether you can show permission rationale UI. * * @see Context#checkSelfPermission(String) * @see #requestPermissions(String[], int) * @see #onRequestPermissionsResult(int, String[], int[]) */ public boolean shouldShowRequestPermissionRationale(@NonNull String permission) { if (mHost != null) { return mHost.getContext().getPackageManager() .shouldShowRequestPermissionRationale(permission); } return false; } /** * @hide Hack so that DialogFragment can make its Dialog before creating * its views, and the view construction can use the dialog's context for * inflation. Maybe this should become a public API. Note sure. */ public LayoutInflater getLayoutInflater(Bundle savedInstanceState) { final LayoutInflater result = mHost.onGetLayoutInflater(); if (mHost.onUseFragmentManagerInflaterFactory()) { getChildFragmentManager(); // Init if needed; use raw implementation below. result.setPrivateFactory(mChildFragmentManager.getLayoutInflaterFactory()); } return result; } /** * @deprecated Use {@link #onInflate(Context, AttributeSet, Bundle)} instead. */ @Deprecated @CallSuper public void onInflate(AttributeSet attrs, Bundle savedInstanceState) { mCalled = true; } /** * Called when a fragment is being created as part of a view layout * inflation, typically from setting the content view of an activity. This * may be called immediately after the fragment is created from a * tag in a layout file. Note this is before the fragment's * {@link #onAttach(Activity)} has been called; all you should do here is * parse the attributes and save them away. * *

This is called every time the fragment is inflated, even if it is * being inflated into a new instance with saved state. It typically makes * sense to re-parse the parameters each time, to allow them to change with * different configurations.

* *

Here is a typical implementation of a fragment that can take parameters * both through attributes supplied here as well from {@link #getArguments()}:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java * fragment} * *

Note that parsing the XML attributes uses a "styleable" resource. The * declaration for the styleable used here is:

* * {@sample development/samples/ApiDemos/res/values/attrs.xml fragment_arguments} * *

The fragment can then be declared within its activity's content layout * through a tag like this:

* * {@sample development/samples/ApiDemos/res/layout/fragment_arguments.xml from_attributes} * *

This fragment can also be created dynamically from arguments given * at runtime in the arguments Bundle; here is an example of doing so at * creation of the containing activity:

* * {@sample development/samples/ApiDemos/src/com/example/android/apis/app/FragmentArguments.java * create} * * @param context The Context that is inflating this fragment. * @param attrs The attributes at the tag where the fragment is * being created. * @param savedInstanceState If the fragment is being re-created from * a previous saved state, this is the state. */ @CallSuper public void onInflate(Context context, AttributeSet attrs, Bundle savedInstanceState) { onInflate(attrs, savedInstanceState); mCalled = true; TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Fragment); mEnterTransition = loadTransition(context, a, mEnterTransition, null, com.android.internal.R.styleable.Fragment_fragmentEnterTransition); mReturnTransition = loadTransition(context, a, mReturnTransition, USE_DEFAULT_TRANSITION, com.android.internal.R.styleable.Fragment_fragmentReturnTransition); mExitTransition = loadTransition(context, a, mExitTransition, null, com.android.internal.R.styleable.Fragment_fragmentExitTransition); mReenterTransition = loadTransition(context, a, mReenterTransition, USE_DEFAULT_TRANSITION, com.android.internal.R.styleable.Fragment_fragmentReenterTransition); mSharedElementEnterTransition = loadTransition(context, a, mSharedElementEnterTransition, null, com.android.internal.R.styleable.Fragment_fragmentSharedElementEnterTransition); mSharedElementReturnTransition = loadTransition(context, a, mSharedElementReturnTransition, USE_DEFAULT_TRANSITION, com.android.internal.R.styleable.Fragment_fragmentSharedElementReturnTransition); if (mAllowEnterTransitionOverlap == null) { mAllowEnterTransitionOverlap = a.getBoolean( com.android.internal.R.styleable.Fragment_fragmentAllowEnterTransitionOverlap, true); } if (mAllowReturnTransitionOverlap == null) { mAllowReturnTransitionOverlap = a.getBoolean( com.android.internal.R.styleable.Fragment_fragmentAllowReturnTransitionOverlap, true); } a.recycle(); final Activity hostActivity = mHost == null ? null : mHost.getActivity(); if (hostActivity != null) { mCalled = false; onInflate(hostActivity, attrs, savedInstanceState); } } /** * @deprecated Use {@link #onInflate(Context, AttributeSet, Bundle)} instead. */ @Deprecated @CallSuper public void onInflate(Activity activity, AttributeSet attrs, Bundle savedInstanceState) { mCalled = true; } /** * Called when a fragment is attached as a child of this fragment. * *

This is called after the attached fragment's onAttach and before * the attached fragment's onCreate if the fragment has not yet had a previous * call to onCreate.

* * @param childFragment child fragment being attached */ public void onAttachFragment(Fragment childFragment) { } /** * Called when a fragment is first attached to its context. * {@link #onCreate(Bundle)} will be called after this. */ @CallSuper public void onAttach(Context context) { mCalled = true; final Activity hostActivity = mHost == null ? null : mHost.getActivity(); if (hostActivity != null) { mCalled = false; onAttach(hostActivity); } } /** * @deprecated Use {@link #onAttach(Context)} instead. */ @Deprecated @CallSuper public void onAttach(Activity activity) { mCalled = true; } /** * Called when a fragment loads an animation. */ public Animator onCreateAnimator(int transit, boolean enter, int nextAnim) { return null; } /** * Called to do initial creation of a fragment. This is called after * {@link #onAttach(Activity)} and before * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, but is not called if the fragment * instance is retained across Activity re-creation (see {@link #setRetainInstance(boolean)}). * *

Note that this can be called while the fragment's activity is * still in the process of being created. As such, you can not rely * on things like the activity's content view hierarchy being initialized * at this point. If you want to do work once the activity itself is * created, see {@link #onActivityCreated(Bundle)}. * *

If your app's targetSdkVersion is {@link android.os.Build.VERSION_CODES#M} * or lower, child fragments being restored from the savedInstanceState are restored after * onCreate returns. When targeting {@link android.os.Build.VERSION_CODES#N} or * above and running on an N or newer platform version * they are restored by Fragment.onCreate.

* * @param savedInstanceState If the fragment is being re-created from * a previous saved state, this is the state. */ @CallSuper public void onCreate(@Nullable Bundle savedInstanceState) { mCalled = true; final Context context = getContext(); final int version = context != null ? context.getApplicationInfo().targetSdkVersion : 0; if (version >= Build.VERSION_CODES.N) { restoreChildFragmentState(savedInstanceState, true); if (mChildFragmentManager != null && !mChildFragmentManager.isStateAtLeast(Fragment.CREATED)) { mChildFragmentManager.dispatchCreate(); } } } void restoreChildFragmentState(@Nullable Bundle savedInstanceState, boolean provideNonConfig) { if (savedInstanceState != null) { Parcelable p = savedInstanceState.getParcelable(Activity.FRAGMENTS_TAG); if (p != null) { if (mChildFragmentManager == null) { instantiateChildFragmentManager(); } mChildFragmentManager.restoreAllState(p, provideNonConfig ? mChildNonConfig : null); mChildNonConfig = null; mChildFragmentManager.dispatchCreate(); } } } /** * Called to have the fragment instantiate its user interface view. * This is optional, and non-graphical fragments can return null (which * is the default implementation). This will be called between * {@link #onCreate(Bundle)} and {@link #onActivityCreated(Bundle)}. * *

If you return a View from here, you will later be called in * {@link #onDestroyView} when the view is being released. * * @param inflater The LayoutInflater object that can be used to inflate * any views in the fragment, * @param container If non-null, this is the parent view that the fragment's * UI should be attached to. The fragment should not add the view itself, * but this can be used to generate the LayoutParams of the view. * @param savedInstanceState If non-null, this fragment is being re-constructed * from a previous saved state as given here. * * @return Return the View for the fragment's UI, or null. */ @Nullable public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { return null; } /** * Called immediately after {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)} * has returned, but before any saved state has been restored in to the view. * This gives subclasses a chance to initialize themselves once * they know their view hierarchy has been completely created. The fragment's * view hierarchy is not however attached to its parent at this point. * @param view The View returned by {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}. * @param savedInstanceState If non-null, this fragment is being re-constructed * from a previous saved state as given here. */ public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { } /** * Get the root view for the fragment's layout (the one returned by {@link #onCreateView}), * if provided. * * @return The fragment's root view, or null if it has no layout. */ @Nullable public View getView() { return mView; } /** * Called when the fragment's activity has been created and this * fragment's view hierarchy instantiated. It can be used to do final * initialization once these pieces are in place, such as retrieving * views or restoring state. It is also useful for fragments that use * {@link #setRetainInstance(boolean)} to retain their instance, * as this callback tells the fragment when it is fully associated with * the new activity instance. This is called after {@link #onCreateView} * and before {@link #onViewStateRestored(Bundle)}. * * @param savedInstanceState If the fragment is being re-created from * a previous saved state, this is the state. */ @CallSuper public void onActivityCreated(@Nullable Bundle savedInstanceState) { mCalled = true; } /** * Called when all saved state has been restored into the view hierarchy * of the fragment. This can be used to do initialization based on saved * state that you are letting the view hierarchy track itself, such as * whether check box widgets are currently checked. This is called * after {@link #onActivityCreated(Bundle)} and before * {@link #onStart()}. * * @param savedInstanceState If the fragment is being re-created from * a previous saved state, this is the state. */ @CallSuper public void onViewStateRestored(Bundle savedInstanceState) { mCalled = true; } /** * Called when the Fragment is visible to the user. This is generally * tied to {@link Activity#onStart() Activity.onStart} of the containing * Activity's lifecycle. */ @CallSuper public void onStart() { mCalled = true; if (!mLoadersStarted) { mLoadersStarted = true; if (!mCheckedForLoaderManager) { mCheckedForLoaderManager = true; mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); } if (mLoaderManager != null) { mLoaderManager.doStart(); } } } /** * Called when the fragment is visible to the user and actively running. * This is generally * tied to {@link Activity#onResume() Activity.onResume} of the containing * Activity's lifecycle. */ @CallSuper public void onResume() { mCalled = true; } /** * Called to ask the fragment to save its current dynamic state, so it * can later be reconstructed in a new instance of its process is * restarted. If a new instance of the fragment later needs to be * created, the data you place in the Bundle here will be available * in the Bundle given to {@link #onCreate(Bundle)}, * {@link #onCreateView(LayoutInflater, ViewGroup, Bundle)}, and * {@link #onActivityCreated(Bundle)}. * *

This corresponds to {@link Activity#onSaveInstanceState(Bundle) * Activity.onSaveInstanceState(Bundle)} and most of the discussion there * applies here as well. Note however: this method may be called * at any time before {@link #onDestroy()}. There are many situations * where a fragment may be mostly torn down (such as when placed on the * back stack with no UI showing), but its state will not be saved until * its owning activity actually needs to save its state. * * @param outState Bundle in which to place your saved state. */ public void onSaveInstanceState(Bundle outState) { } /** * Called when the Fragment's activity changes from fullscreen mode to multi-window mode and * visa-versa. This is generally tied to {@link Activity#onMultiWindowModeChanged} of the * containing Activity. * * @param isInMultiWindowMode True if the activity is in multi-window mode. */ public void onMultiWindowModeChanged(boolean isInMultiWindowMode) { } /** * Called by the system when the activity changes to and from picture-in-picture mode. This is * generally tied to {@link Activity#onPictureInPictureModeChanged} of the containing Activity. * * @param isInPictureInPictureMode True if the activity is in picture-in-picture mode. */ public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode) { } @CallSuper public void onConfigurationChanged(Configuration newConfig) { mCalled = true; } /** * Called when the Fragment is no longer resumed. This is generally * tied to {@link Activity#onPause() Activity.onPause} of the containing * Activity's lifecycle. */ @CallSuper public void onPause() { mCalled = true; } /** * Called when the Fragment is no longer started. This is generally * tied to {@link Activity#onStop() Activity.onStop} of the containing * Activity's lifecycle. */ @CallSuper public void onStop() { mCalled = true; } @CallSuper public void onLowMemory() { mCalled = true; } @CallSuper public void onTrimMemory(int level) { mCalled = true; } /** * Called when the view previously created by {@link #onCreateView} has * been detached from the fragment. The next time the fragment needs * to be displayed, a new view will be created. This is called * after {@link #onStop()} and before {@link #onDestroy()}. It is called * regardless of whether {@link #onCreateView} returned a * non-null view. Internally it is called after the view's state has * been saved but before it has been removed from its parent. */ @CallSuper public void onDestroyView() { mCalled = true; } /** * Called when the fragment is no longer in use. This is called * after {@link #onStop()} and before {@link #onDetach()}. */ @CallSuper public void onDestroy() { mCalled = true; //Log.v("foo", "onDestroy: mCheckedForLoaderManager=" + mCheckedForLoaderManager // + " mLoaderManager=" + mLoaderManager); if (!mCheckedForLoaderManager) { mCheckedForLoaderManager = true; mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); } if (mLoaderManager != null) { mLoaderManager.doDestroy(); } } /** * Called by the fragment manager once this fragment has been removed, * so that we don't have any left-over state if the application decides * to re-use the instance. This only clears state that the framework * internally manages, not things the application sets. */ void initState() { mIndex = -1; mWho = null; mAdded = false; mRemoving = false; mFromLayout = false; mInLayout = false; mRestored = false; mBackStackNesting = 0; mFragmentManager = null; mChildFragmentManager = null; mHost = null; mFragmentId = 0; mContainerId = 0; mTag = null; mHidden = false; mDetached = false; mRetaining = false; mLoaderManager = null; mLoadersStarted = false; mCheckedForLoaderManager = false; } /** * Called when the fragment is no longer attached to its activity. This is called after * {@link #onDestroy()}, except in the cases where the fragment instance is retained across * Activity re-creation (see {@link #setRetainInstance(boolean)}), in which case it is called * after {@link #onStop()}. */ @CallSuper public void onDetach() { mCalled = true; } /** * Initialize the contents of the Activity's standard options menu. You * should place your menu items in to menu. For this method * to be called, you must have first called {@link #setHasOptionsMenu}. See * {@link Activity#onCreateOptionsMenu(Menu) Activity.onCreateOptionsMenu} * for more information. * * @param menu The options menu in which you place your items. * * @see #setHasOptionsMenu * @see #onPrepareOptionsMenu * @see #onOptionsItemSelected */ public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { } /** * 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. See * {@link Activity#onPrepareOptionsMenu(Menu) Activity.onPrepareOptionsMenu} * for more information. * * @param menu The options menu as last shown or first initialized by * onCreateOptionsMenu(). * * @see #setHasOptionsMenu * @see #onCreateOptionsMenu */ public void onPrepareOptionsMenu(Menu menu) { } /** * Called when this fragment's option menu items are no longer being * included in the overall options menu. Receiving this call means that * the menu needed to be rebuilt, but this fragment's items were not * included in the newly built menu (its {@link #onCreateOptionsMenu(Menu, MenuInflater)} * was not called). */ public void onDestroyOptionsMenu() { } /** * 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. * * @param item The menu item that was selected. * * @return boolean Return false to allow normal menu processing to * proceed, true to consume it here. * * @see #onCreateOptionsMenu */ public boolean onOptionsItemSelected(MenuItem item) { return false; } /** * 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). * * @param menu The options menu as last shown or first initialized by * onCreateOptionsMenu(). */ public void onOptionsMenuClosed(Menu menu) { } /** * Called when a context menu for the {@code view} is about to be shown. * Unlike {@link #onCreateOptionsMenu}, 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 {@link AdapterView} subclasses, * this can be found in the {@code menuInfo})). *

* Use {@link #onContextItemSelected(android.view.MenuItem)} to know when an * item has been selected. *

* The default implementation calls up to * {@link Activity#onCreateContextMenu Activity.onCreateContextMenu}, though * you can not call this implementation if you don't want that behavior. *

* It is not safe to hold onto the context menu after this method returns. * {@inheritDoc} */ public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { getActivity().onCreateContextMenu(menu, v, menuInfo); } /** * Registers a context menu to be shown for the given view (multiple views * can show the context menu). This method will set the * {@link OnCreateContextMenuListener} on the view to this fragment, so * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be * called when it is time to show the context menu. * * @see #unregisterForContextMenu(View) * @param view The view that should show a context menu. */ public void registerForContextMenu(View view) { view.setOnCreateContextMenuListener(this); } /** * Prevents a context menu to be shown for the given view. This method will * remove the {@link OnCreateContextMenuListener} on the view. * * @see #registerForContextMenu(View) * @param view The view that should stop showing a context menu. */ public void unregisterForContextMenu(View view) { view.setOnCreateContextMenuListener(null); } /** * 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 {@link MenuItem#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. * * @param item The context menu item that was selected. * @return boolean Return false to allow normal context menu processing to * proceed, true to consume it here. */ public boolean onContextItemSelected(MenuItem item) { return false; } /** * When custom transitions are used with Fragments, the enter transition callback * is called when this Fragment is attached or detached when not popping the back stack. * * @param callback Used to manipulate the shared element transitions on this Fragment * when added not as a pop from the back stack. */ public void setEnterSharedElementCallback(SharedElementCallback callback) { if (callback == null) { callback = SharedElementCallback.NULL_CALLBACK; } mEnterTransitionCallback = callback; } /** * @hide */ public void setEnterSharedElementTransitionCallback(SharedElementCallback callback) { setEnterSharedElementCallback(callback); } /** * When custom transitions are used with Fragments, the exit transition callback * is called when this Fragment is attached or detached when popping the back stack. * * @param callback Used to manipulate the shared element transitions on this Fragment * when added as a pop from the back stack. */ public void setExitSharedElementCallback(SharedElementCallback callback) { if (callback == null) { callback = SharedElementCallback.NULL_CALLBACK; } mExitTransitionCallback = callback; } /** * @hide */ public void setExitSharedElementTransitionCallback(SharedElementCallback callback) { setExitSharedElementCallback(callback); } /** * Sets the Transition that will be used to move Views into the initial scene. The entering * Views will be those that are regular Views or ViewGroups that have * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as entering is governed by changing visibility from * {@link View#INVISIBLE} to {@link View#VISIBLE}. If transition is null, * entering Views will remain unaffected. * * @param transition The Transition to use to move Views into the initial Scene. * @attr ref android.R.styleable#Fragment_fragmentEnterTransition */ public void setEnterTransition(Transition transition) { mEnterTransition = transition; } /** * Returns the Transition that will be used to move Views into the initial scene. The entering * Views will be those that are regular Views or ViewGroups that have * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as entering is governed by changing visibility from * {@link View#INVISIBLE} to {@link View#VISIBLE}. * * @return the Transition to use to move Views into the initial Scene. * @attr ref android.R.styleable#Fragment_fragmentEnterTransition */ public Transition getEnterTransition() { return mEnterTransition; } /** * Sets the Transition that will be used to move Views out of the scene when the Fragment is * preparing to be removed, hidden, or detached because of popping the back stack. The exiting * Views will be those that are regular Views or ViewGroups that have * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as entering is governed by changing visibility from * {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, * entering Views will remain unaffected. If nothing is set, the default will be to * use the same value as set in {@link #setEnterTransition(android.transition.Transition)}. * * @param transition The Transition to use to move Views out of the Scene when the Fragment * is preparing to close. * @attr ref android.R.styleable#Fragment_fragmentExitTransition */ public void setReturnTransition(Transition transition) { mReturnTransition = transition; } /** * Returns the Transition that will be used to move Views out of the scene when the Fragment is * preparing to be removed, hidden, or detached because of popping the back stack. The exiting * Views will be those that are regular Views or ViewGroups that have * {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as entering is governed by changing visibility from * {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, * entering Views will remain unaffected. * * @return the Transition to use to move Views out of the Scene when the Fragment * is preparing to close. * @attr ref android.R.styleable#Fragment_fragmentExitTransition */ public Transition getReturnTransition() { return mReturnTransition == USE_DEFAULT_TRANSITION ? getEnterTransition() : mReturnTransition; } /** * Sets the Transition that will be used to move Views out of the scene when the * fragment is removed, hidden, or detached when not popping the back stack. * The exiting Views will be those that are regular Views or ViewGroups that * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as exiting is governed by changing visibility * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will * remain unaffected. * * @param transition The Transition to use to move Views out of the Scene when the Fragment * is being closed not due to popping the back stack. * @attr ref android.R.styleable#Fragment_fragmentExitTransition */ public void setExitTransition(Transition transition) { mExitTransition = transition; } /** * Returns the Transition that will be used to move Views out of the scene when the * fragment is removed, hidden, or detached when not popping the back stack. * The exiting Views will be those that are regular Views or ViewGroups that * have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions will extend * {@link android.transition.Visibility} as exiting is governed by changing visibility * from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, the views will * remain unaffected. * * @return the Transition to use to move Views out of the Scene when the Fragment * is being closed not due to popping the back stack. * @attr ref android.R.styleable#Fragment_fragmentExitTransition */ public Transition getExitTransition() { return mExitTransition; } /** * Sets the Transition that will be used to move Views in to the scene when returning due * to popping a back stack. The entering Views will be those that are regular Views * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions * will extend {@link android.transition.Visibility} as exiting is governed by changing * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, * the views will remain unaffected. If nothing is set, the default will be to use the same * transition as {@link #setExitTransition(android.transition.Transition)}. * * @param transition The Transition to use to move Views into the scene when reentering from a * previously-started Activity. * @attr ref android.R.styleable#Fragment_fragmentReenterTransition */ public void setReenterTransition(Transition transition) { mReenterTransition = transition; } /** * Returns the Transition that will be used to move Views in to the scene when returning due * to popping a back stack. The entering Views will be those that are regular Views * or ViewGroups that have {@link ViewGroup#isTransitionGroup} return true. Typical Transitions * will extend {@link android.transition.Visibility} as exiting is governed by changing * visibility from {@link View#VISIBLE} to {@link View#INVISIBLE}. If transition is null, * the views will remain unaffected. If nothing is set, the default will be to use the same * transition as {@link #setExitTransition(android.transition.Transition)}. * * @return the Transition to use to move Views into the scene when reentering from a * previously-started Activity. * @attr ref android.R.styleable#Fragment_fragmentReenterTransition */ public Transition getReenterTransition() { return mReenterTransition == USE_DEFAULT_TRANSITION ? getExitTransition() : mReenterTransition; } /** * Sets the Transition that will be used for shared elements transferred into the content * Scene. Typical Transitions will affect size and location, such as * {@link android.transition.ChangeBounds}. A null * value will cause transferred shared elements to blink to the final position. * * @param transition The Transition to use for shared elements transferred into the content * Scene. * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition */ public void setSharedElementEnterTransition(Transition transition) { mSharedElementEnterTransition = transition; } /** * Returns the Transition that will be used for shared elements transferred into the content * Scene. Typical Transitions will affect size and location, such as * {@link android.transition.ChangeBounds}. A null * value will cause transferred shared elements to blink to the final position. * * @return The Transition to use for shared elements transferred into the content * Scene. * @attr ref android.R.styleable#Fragment_fragmentSharedElementEnterTransition */ public Transition getSharedElementEnterTransition() { return mSharedElementEnterTransition; } /** * Sets the Transition that will be used for shared elements transferred back during a * pop of the back stack. This Transition acts in the leaving Fragment. * Typical Transitions will affect size and location, such as * {@link android.transition.ChangeBounds}. A null * value will cause transferred shared elements to blink to the final position. * If no value is set, the default will be to use the same value as * {@link #setSharedElementEnterTransition(android.transition.Transition)}. * * @param transition The Transition to use for shared elements transferred out of the content * Scene. * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition */ public void setSharedElementReturnTransition(Transition transition) { mSharedElementReturnTransition = transition; } /** * Return the Transition that will be used for shared elements transferred back during a * pop of the back stack. This Transition acts in the leaving Fragment. * Typical Transitions will affect size and location, such as * {@link android.transition.ChangeBounds}. A null * value will cause transferred shared elements to blink to the final position. * If no value is set, the default will be to use the same value as * {@link #setSharedElementEnterTransition(android.transition.Transition)}. * * @return The Transition to use for shared elements transferred out of the content * Scene. * @attr ref android.R.styleable#Fragment_fragmentSharedElementReturnTransition */ public Transition getSharedElementReturnTransition() { return mSharedElementReturnTransition == USE_DEFAULT_TRANSITION ? getSharedElementEnterTransition() : mSharedElementReturnTransition; } /** * Sets whether the the exit transition and enter transition overlap or not. * When true, the enter transition will start as soon as possible. When false, the * enter transition will wait until the exit transition completes before starting. * * @param allow true to start the enter transition when possible or false to * wait until the exiting transition completes. * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap */ public void setAllowEnterTransitionOverlap(boolean allow) { mAllowEnterTransitionOverlap = allow; } /** * Returns whether the the exit transition and enter transition overlap or not. * When true, the enter transition will start as soon as possible. When false, the * enter transition will wait until the exit transition completes before starting. * * @return true when the enter transition should start as soon as possible or false to * when it should wait until the exiting transition completes. * @attr ref android.R.styleable#Fragment_fragmentAllowEnterTransitionOverlap */ public boolean getAllowEnterTransitionOverlap() { return (mAllowEnterTransitionOverlap == null) ? true : mAllowEnterTransitionOverlap; } /** * Sets whether the the return transition and reenter transition overlap or not. * When true, the reenter transition will start as soon as possible. When false, the * reenter transition will wait until the return transition completes before starting. * * @param allow true to start the reenter transition when possible or false to wait until the * return transition completes. * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap */ public void setAllowReturnTransitionOverlap(boolean allow) { mAllowReturnTransitionOverlap = allow; } /** * Returns whether the the return transition and reenter transition overlap or not. * When true, the reenter transition will start as soon as possible. When false, the * reenter transition will wait until the return transition completes before starting. * * @return true to start the reenter transition when possible or false to wait until the * return transition completes. * @attr ref android.R.styleable#Fragment_fragmentAllowReturnTransitionOverlap */ public boolean getAllowReturnTransitionOverlap() { return (mAllowReturnTransitionOverlap == null) ? true : mAllowReturnTransitionOverlap; } /** * Print the Fragments's state into the given stream. * * @param prefix Text to print at the front of each line. * @param fd The raw file descriptor that the dump is being sent to. * @param writer The PrintWriter to which you should dump your state. This will be * closed for you after you return. * @param args additional arguments to the dump request. */ public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { writer.print(prefix); writer.print("mFragmentId=#"); writer.print(Integer.toHexString(mFragmentId)); writer.print(" mContainerId=#"); writer.print(Integer.toHexString(mContainerId)); writer.print(" mTag="); writer.println(mTag); writer.print(prefix); writer.print("mState="); writer.print(mState); writer.print(" mIndex="); writer.print(mIndex); writer.print(" mWho="); writer.print(mWho); writer.print(" mBackStackNesting="); writer.println(mBackStackNesting); writer.print(prefix); writer.print("mAdded="); writer.print(mAdded); writer.print(" mRemoving="); writer.print(mRemoving); writer.print(" mFromLayout="); writer.print(mFromLayout); writer.print(" mInLayout="); writer.println(mInLayout); writer.print(prefix); writer.print("mHidden="); writer.print(mHidden); writer.print(" mDetached="); writer.print(mDetached); writer.print(" mMenuVisible="); writer.print(mMenuVisible); writer.print(" mHasMenu="); writer.println(mHasMenu); writer.print(prefix); writer.print("mRetainInstance="); writer.print(mRetainInstance); writer.print(" mRetaining="); writer.print(mRetaining); writer.print(" mUserVisibleHint="); writer.println(mUserVisibleHint); if (mFragmentManager != null) { writer.print(prefix); writer.print("mFragmentManager="); writer.println(mFragmentManager); } if (mHost != null) { writer.print(prefix); writer.print("mHost="); writer.println(mHost); } if (mParentFragment != null) { writer.print(prefix); writer.print("mParentFragment="); writer.println(mParentFragment); } if (mArguments != null) { writer.print(prefix); writer.print("mArguments="); writer.println(mArguments); } if (mSavedFragmentState != null) { writer.print(prefix); writer.print("mSavedFragmentState="); writer.println(mSavedFragmentState); } if (mSavedViewState != null) { writer.print(prefix); writer.print("mSavedViewState="); writer.println(mSavedViewState); } if (mTarget != null) { writer.print(prefix); writer.print("mTarget="); writer.print(mTarget); writer.print(" mTargetRequestCode="); writer.println(mTargetRequestCode); } if (mNextAnim != 0) { writer.print(prefix); writer.print("mNextAnim="); writer.println(mNextAnim); } if (mContainer != null) { writer.print(prefix); writer.print("mContainer="); writer.println(mContainer); } if (mView != null) { writer.print(prefix); writer.print("mView="); writer.println(mView); } if (mAnimatingAway != null) { writer.print(prefix); writer.print("mAnimatingAway="); writer.println(mAnimatingAway); writer.print(prefix); writer.print("mStateAfterAnimating="); writer.println(mStateAfterAnimating); } if (mLoaderManager != null) { writer.print(prefix); writer.println("Loader Manager:"); mLoaderManager.dump(prefix + " ", fd, writer, args); } if (mChildFragmentManager != null) { writer.print(prefix); writer.println("Child " + mChildFragmentManager + ":"); mChildFragmentManager.dump(prefix + " ", fd, writer, args); } } Fragment findFragmentByWho(String who) { if (who.equals(mWho)) { return this; } if (mChildFragmentManager != null) { return mChildFragmentManager.findFragmentByWho(who); } return null; } void instantiateChildFragmentManager() { mChildFragmentManager = new FragmentManagerImpl(); mChildFragmentManager.attachController(mHost, new FragmentContainer() { @Override @Nullable public View onFindViewById(int id) { if (mView == null) { throw new IllegalStateException("Fragment does not have a view"); } return mView.findViewById(id); } @Override public boolean onHasView() { return (mView != null); } }, this); } void performCreate(Bundle savedInstanceState) { if (mChildFragmentManager != null) { mChildFragmentManager.noteStateNotSaved(); } mState = CREATED; mCalled = false; onCreate(savedInstanceState); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onCreate()"); } final Context context = getContext(); final int version = context != null ? context.getApplicationInfo().targetSdkVersion : 0; if (version < Build.VERSION_CODES.N) { restoreChildFragmentState(savedInstanceState, false); } } View performCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (mChildFragmentManager != null) { mChildFragmentManager.noteStateNotSaved(); } return onCreateView(inflater, container, savedInstanceState); } void performActivityCreated(Bundle savedInstanceState) { if (mChildFragmentManager != null) { mChildFragmentManager.noteStateNotSaved(); } mState = ACTIVITY_CREATED; mCalled = false; onActivityCreated(savedInstanceState); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onActivityCreated()"); } if (mChildFragmentManager != null) { mChildFragmentManager.dispatchActivityCreated(); } } void performStart() { if (mChildFragmentManager != null) { mChildFragmentManager.noteStateNotSaved(); mChildFragmentManager.execPendingActions(); } mState = STARTED; mCalled = false; onStart(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onStart()"); } if (mChildFragmentManager != null) { mChildFragmentManager.dispatchStart(); } if (mLoaderManager != null) { mLoaderManager.doReportStart(); } } void performResume() { if (mChildFragmentManager != null) { mChildFragmentManager.noteStateNotSaved(); mChildFragmentManager.execPendingActions(); } mState = RESUMED; mCalled = false; onResume(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onResume()"); } if (mChildFragmentManager != null) { mChildFragmentManager.dispatchResume(); mChildFragmentManager.execPendingActions(); } } void performMultiWindowModeChanged(boolean isInMultiWindowMode) { onMultiWindowModeChanged(isInMultiWindowMode); if (mChildFragmentManager != null) { mChildFragmentManager.dispatchMultiWindowModeChanged(isInMultiWindowMode); } } void performPictureInPictureModeChanged(boolean isInPictureInPictureMode) { onPictureInPictureModeChanged(isInPictureInPictureMode); if (mChildFragmentManager != null) { mChildFragmentManager.dispatchPictureInPictureModeChanged(isInPictureInPictureMode); } } void performConfigurationChanged(Configuration newConfig) { onConfigurationChanged(newConfig); if (mChildFragmentManager != null) { mChildFragmentManager.dispatchConfigurationChanged(newConfig); } } void performLowMemory() { onLowMemory(); if (mChildFragmentManager != null) { mChildFragmentManager.dispatchLowMemory(); } } void performTrimMemory(int level) { onTrimMemory(level); if (mChildFragmentManager != null) { mChildFragmentManager.dispatchTrimMemory(level); } } boolean performCreateOptionsMenu(Menu menu, MenuInflater inflater) { boolean show = false; if (!mHidden) { if (mHasMenu && mMenuVisible) { show = true; onCreateOptionsMenu(menu, inflater); } if (mChildFragmentManager != null) { show |= mChildFragmentManager.dispatchCreateOptionsMenu(menu, inflater); } } return show; } boolean performPrepareOptionsMenu(Menu menu) { boolean show = false; if (!mHidden) { if (mHasMenu && mMenuVisible) { show = true; onPrepareOptionsMenu(menu); } if (mChildFragmentManager != null) { show |= mChildFragmentManager.dispatchPrepareOptionsMenu(menu); } } return show; } boolean performOptionsItemSelected(MenuItem item) { if (!mHidden) { if (mHasMenu && mMenuVisible) { if (onOptionsItemSelected(item)) { return true; } } if (mChildFragmentManager != null) { if (mChildFragmentManager.dispatchOptionsItemSelected(item)) { return true; } } } return false; } boolean performContextItemSelected(MenuItem item) { if (!mHidden) { if (onContextItemSelected(item)) { return true; } if (mChildFragmentManager != null) { if (mChildFragmentManager.dispatchContextItemSelected(item)) { return true; } } } return false; } void performOptionsMenuClosed(Menu menu) { if (!mHidden) { if (mHasMenu && mMenuVisible) { onOptionsMenuClosed(menu); } if (mChildFragmentManager != null) { mChildFragmentManager.dispatchOptionsMenuClosed(menu); } } } void performSaveInstanceState(Bundle outState) { onSaveInstanceState(outState); if (mChildFragmentManager != null) { Parcelable p = mChildFragmentManager.saveAllState(); if (p != null) { outState.putParcelable(Activity.FRAGMENTS_TAG, p); } } } void performPause() { if (mChildFragmentManager != null) { mChildFragmentManager.dispatchPause(); } mState = STARTED; mCalled = false; onPause(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onPause()"); } } void performStop() { if (mChildFragmentManager != null) { mChildFragmentManager.dispatchStop(); } mState = STOPPED; mCalled = false; onStop(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onStop()"); } if (mLoadersStarted) { mLoadersStarted = false; if (!mCheckedForLoaderManager) { mCheckedForLoaderManager = true; mLoaderManager = mHost.getLoaderManager(mWho, mLoadersStarted, false); } if (mLoaderManager != null) { if (mHost.getRetainLoaders()) { mLoaderManager.doRetain(); } else { mLoaderManager.doStop(); } } } } void performDestroyView() { if (mChildFragmentManager != null) { mChildFragmentManager.dispatchDestroyView(); } mState = CREATED; mCalled = false; onDestroyView(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onDestroyView()"); } if (mLoaderManager != null) { mLoaderManager.doReportNextStart(); } } void performDestroy() { if (mChildFragmentManager != null) { mChildFragmentManager.dispatchDestroy(); } mState = INITIALIZING; mCalled = false; onDestroy(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onDestroy()"); } mChildFragmentManager = null; } void performDetach() { mCalled = false; onDetach(); if (!mCalled) { throw new SuperNotCalledException("Fragment " + this + " did not call through to super.onDetach()"); } // Destroy the child FragmentManager if we still have it here. // We won't unless we're retaining our instance and if we do, // our child FragmentManager instance state will have already been saved. if (mChildFragmentManager != null) { if (!mRetaining) { throw new IllegalStateException("Child FragmentManager of " + this + " was not " + " destroyed and this fragment is not retaining instance"); } mChildFragmentManager.dispatchDestroy(); mChildFragmentManager = null; } } private static Transition loadTransition(Context context, TypedArray typedArray, Transition currentValue, Transition defaultValue, int id) { if (currentValue != defaultValue) { return currentValue; } int transitionId = typedArray.getResourceId(id, 0); Transition transition = defaultValue; if (transitionId != 0 && transitionId != com.android.internal.R.transition.no_transition) { TransitionInflater inflater = TransitionInflater.from(context); transition = inflater.inflateTransition(transitionId); if (transition instanceof TransitionSet && ((TransitionSet)transition).getTransitionCount() == 0) { transition = null; } } return transition; } }