Java tutorial
/* * 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.animation.AnimatorInflater; import android.animation.AnimatorListenerAdapter; import android.animation.AnimatorSet; import android.animation.PropertyValuesHolder; import android.animation.ValueAnimator; import android.annotation.UnsupportedAppUsage; import android.content.Context; import android.content.pm.ApplicationInfo; import android.content.res.Configuration; import android.content.res.Resources.NotFoundException; import android.content.res.TypedArray; import android.os.Build; import android.os.Bundle; import android.os.Debug; import android.os.Looper; import android.os.Parcel; import android.os.Parcelable; import android.util.ArraySet; import android.util.AttributeSet; import android.util.DebugUtils; import android.util.Log; import android.util.LogWriter; import android.util.Pair; import android.util.SparseArray; import android.util.SuperNotCalledException; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import com.android.internal.util.FastPrintWriter; import java.io.FileDescriptor; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; /** * Interface for interacting with {@link Fragment} objects inside of an * {@link Activity} * * <div class="special reference"> * <h3>Developer Guides</h3> * <p>For more information about using fragments, read the * <a href="{@docRoot}guide/components/fragments.html">Fragments</a> developer guide.</p> * </div> * * While the FragmentManager 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 * <a href="http://android-developers.blogspot.com/2011/03/fragments-for-all.html"> * Fragments For All</a> for more details. * * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html">Support Library</a> * {@link android.support.v4.app.FragmentManager} for consistent behavior across all devices * and access to <a href="{@docRoot}topic/libraries/architecture/lifecycle.html">Lifecycle</a>. */ @Deprecated public abstract class FragmentManager { /** * Representation of an entry on the fragment back stack, as created * with {@link FragmentTransaction#addToBackStack(String) * FragmentTransaction.addToBackStack()}. Entries can later be * retrieved with {@link FragmentManager#getBackStackEntryAt(int) * FragmentManager.getBackStackEntryAt()}. * * <p>Note that you should never hold on to a BackStackEntry object; * the identifier as returned by {@link #getId} is the only thing that * will be persisted across activity instances. * * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> * Support Library</a> {@link android.support.v4.app.FragmentManager.BackStackEntry} */ @Deprecated public interface BackStackEntry { /** * Return the unique identifier for the entry. This is the only * representation of the entry that will persist across activity * instances. */ public int getId(); /** * Get the name that was supplied to * {@link FragmentTransaction#addToBackStack(String) * FragmentTransaction.addToBackStack(String)} when creating this entry. */ public String getName(); /** * Return the full bread crumb title resource identifier for the entry, * or 0 if it does not have one. */ public int getBreadCrumbTitleRes(); /** * Return the short bread crumb title resource identifier for the entry, * or 0 if it does not have one. */ public int getBreadCrumbShortTitleRes(); /** * Return the full bread crumb title for the entry, or null if it * does not have one. */ public CharSequence getBreadCrumbTitle(); /** * Return the short bread crumb title for the entry, or null if it * does not have one. */ public CharSequence getBreadCrumbShortTitle(); } /** * Interface to watch for changes to the back stack. * * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> * Support Library</a> * {@link android.support.v4.app.FragmentManager.OnBackStackChangedListener} */ @Deprecated public interface OnBackStackChangedListener { /** * Called whenever the contents of the back stack change. */ public void onBackStackChanged(); } /** * Start a series of edit operations on the Fragments associated with * this FragmentManager. * * <p>Note: A fragment transaction can only be created/committed prior * to an activity saving its state. If you try to commit a transaction * after {@link Activity#onSaveInstanceState Activity.onSaveInstanceState()} * (and prior to a following {@link Activity#onStart Activity.onStart} * or {@link Activity#onResume Activity.onResume()}, you will get an error. * This is because the framework takes care of saving your current fragments * in the state, and if changes are made after the state is saved then they * will be lost.</p> */ public abstract FragmentTransaction beginTransaction(); /** @hide -- remove once prebuilts are in. */ @Deprecated public FragmentTransaction openTransaction() { return beginTransaction(); } /** * After a {@link FragmentTransaction} is committed with * {@link FragmentTransaction#commit FragmentTransaction.commit()}, it * is scheduled to be executed asynchronously on the process's main thread. * If you want to immediately executing any such pending operations, you * can call this function (only from the main thread) to do so. Note that * all callbacks and other related behavior will be done from within this * call, so be careful about where this is called from. * <p> * This also forces the start of any postponed Transactions where * {@link Fragment#postponeEnterTransition()} has been called. * * @return Returns true if there were any pending transactions to be * executed. */ public abstract boolean executePendingTransactions(); /** * Finds a fragment that was identified by the given id either when inflated * from XML or as the container ID when added in a transaction. This first * searches through fragments that are currently added to the manager's * activity; if no such fragment is found, then all fragments currently * on the back stack associated with this ID are searched. * @return The fragment if found or null otherwise. */ public abstract Fragment findFragmentById(int id); /** * Finds a fragment that was identified by the given tag either when inflated * from XML or as supplied when added in a transaction. This first * searches through fragments that are currently added to the manager's * activity; if no such fragment is found, then all fragments currently * on the back stack are searched. * @return The fragment if found or null otherwise. */ public abstract Fragment findFragmentByTag(String tag); /** * Flag for {@link #popBackStack(String, int)} * and {@link #popBackStack(int, int)}: If set, and the name or ID of * a back stack entry has been supplied, then all matching entries will * be consumed until one that doesn't match is found or the bottom of * the stack is reached. Otherwise, all entries up to but not including that entry * will be removed. */ public static final int POP_BACK_STACK_INCLUSIVE = 1 << 0; /** * Pop the top state off the back stack. This function is asynchronous -- it * enqueues the request to pop, but the action will not be performed until the * application returns to its event loop. */ public abstract void popBackStack(); /** * Like {@link #popBackStack()}, but performs the operation immediately * inside of the call. This is like calling {@link #executePendingTransactions()} * afterwards without forcing the start of postponed Transactions. * @return Returns true if there was something popped, else false. */ public abstract boolean popBackStackImmediate(); /** * Pop the last fragment transition from the manager's fragment * back stack. If there is nothing to pop, false is returned. * This function is asynchronous -- it enqueues the * request to pop, but the action will not be performed until the application * returns to its event loop. * * @param name If non-null, this is the name of a previous back state * to look for; if found, all states up to that state will be popped. The * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether * the named state itself is popped. If null, only the top state is popped. * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. */ public abstract void popBackStack(String name, int flags); /** * Like {@link #popBackStack(String, int)}, but performs the operation immediately * inside of the call. This is like calling {@link #executePendingTransactions()} * afterwards without forcing the start of postponed Transactions. * @return Returns true if there was something popped, else false. */ public abstract boolean popBackStackImmediate(String name, int flags); /** * Pop all back stack states up to the one with the given identifier. * This function is asynchronous -- it enqueues the * request to pop, but the action will not be performed until the application * returns to its event loop. * * @param id Identifier of the stated to be popped. If no identifier exists, * false is returned. * The identifier is the number returned by * {@link FragmentTransaction#commit() FragmentTransaction.commit()}. The * {@link #POP_BACK_STACK_INCLUSIVE} flag can be used to control whether * the named state itself is popped. * @param flags Either 0 or {@link #POP_BACK_STACK_INCLUSIVE}. */ public abstract void popBackStack(int id, int flags); /** * Like {@link #popBackStack(int, int)}, but performs the operation immediately * inside of the call. This is like calling {@link #executePendingTransactions()} * afterwards without forcing the start of postponed Transactions. * @return Returns true if there was something popped, else false. */ public abstract boolean popBackStackImmediate(int id, int flags); /** * Return the number of entries currently in the back stack. */ public abstract int getBackStackEntryCount(); /** * Return the BackStackEntry at index <var>index</var> in the back stack; * where the item on the bottom of the stack has index 0. */ public abstract BackStackEntry getBackStackEntryAt(int index); /** * Add a new listener for changes to the fragment back stack. */ public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener); /** * Remove a listener that was previously added with * {@link #addOnBackStackChangedListener(OnBackStackChangedListener)}. */ public abstract void removeOnBackStackChangedListener(OnBackStackChangedListener listener); /** * Put a reference to a fragment in a Bundle. This Bundle can be * persisted as saved state, and when later restoring * {@link #getFragment(Bundle, String)} will return the current * instance of the same fragment. * * @param bundle The bundle in which to put the fragment reference. * @param key The name of the entry in the bundle. * @param fragment The Fragment whose reference is to be stored. */ public abstract void putFragment(Bundle bundle, String key, Fragment fragment); /** * Retrieve the current Fragment instance for a reference previously * placed with {@link #putFragment(Bundle, String, Fragment)}. * * @param bundle The bundle from which to retrieve the fragment reference. * @param key The name of the entry in the bundle. * @return Returns the current Fragment instance that is associated with * the given reference. */ public abstract Fragment getFragment(Bundle bundle, String key); /** * Get a list of all fragments that are currently added to the FragmentManager. * This may include those that are hidden as well as those that are shown. * This will not include any fragments only in the back stack, or fragments that * are detached or removed. * <p> * The order of the fragments in the list is the order in which they were * added or attached. * * @return A list of all fragments that are added to the FragmentManager. */ public abstract List<Fragment> getFragments(); /** * Save the current instance state of the given Fragment. This can be * used later when creating a new instance of the Fragment and adding * it to the fragment manager, to have it create itself to match the * current state returned here. Note that there are limits on how * this can be used: * * <ul> * <li>The Fragment must currently be attached to the FragmentManager. * <li>A new Fragment created using this saved state must be the same class * type as the Fragment it was created from. * <li>The saved state can not contain dependencies on other fragments -- * that is it can't use {@link #putFragment(Bundle, String, Fragment)} to * store a fragment reference because that reference may not be valid when * this saved state is later used. Likewise the Fragment's target and * result code are not included in this state. * </ul> * * @param f The Fragment whose state is to be saved. * @return The generated state. This will be null if there was no * interesting state created by the fragment. */ public abstract Fragment.SavedState saveFragmentInstanceState(Fragment f); /** * Returns true if the final {@link Activity#onDestroy() Activity.onDestroy()} * call has been made on the FragmentManager's Activity, so this instance is now dead. */ public abstract boolean isDestroyed(); /** * Registers a {@link FragmentLifecycleCallbacks} to listen to fragment lifecycle events * happening in this FragmentManager. All registered callbacks will be automatically * unregistered when this FragmentManager is destroyed. * * @param cb Callbacks to register * @param recursive true to automatically register this callback for all child FragmentManagers */ public abstract void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, boolean recursive); /** * Unregisters a previously registered {@link FragmentLifecycleCallbacks}. If the callback * was not previously registered this call has no effect. All registered callbacks will be * automatically unregistered when this FragmentManager is destroyed. * * @param cb Callbacks to unregister */ public abstract void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb); /** * Return the currently active primary navigation fragment for this FragmentManager. * * <p>The primary navigation fragment's * {@link Fragment#getChildFragmentManager() child FragmentManager} will be called first * to process delegated navigation actions such as {@link #popBackStack()} if no ID * or transaction name is provided to pop to.</p> * * @return the fragment designated as the primary navigation fragment */ public abstract Fragment getPrimaryNavigationFragment(); /** * Print the FragmentManager'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 A PrintWriter to which the dump is to be set. * @param args Additional arguments to the dump request. */ public abstract void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args); /** * Control whether the framework's internal fragment manager debugging * logs are turned on. If enabled, you will see output in logcat as * the framework performs fragment operations. */ public static void enableDebugLogging(boolean enabled) { FragmentManagerImpl.DEBUG = enabled; } /** * Invalidate the attached activity's options menu as necessary. * This may end up being deferred until we move to the resumed state. */ public void invalidateOptionsMenu() { } /** * Returns {@code true} if the FragmentManager's state has already been saved * by its host. Any operations that would change saved state should not be performed * if this method returns true. For example, any popBackStack() method, such as * {@link #popBackStackImmediate()} or any FragmentTransaction using * {@link FragmentTransaction#commit()} instead of * {@link FragmentTransaction#commitAllowingStateLoss()} will change * the state and will result in an error. * * @return true if this FragmentManager's state has already been saved by its host */ public abstract boolean isStateSaved(); /** * Callback interface for listening to fragment state changes that happen * within a given FragmentManager. * * @deprecated Use the <a href="{@docRoot}tools/extras/support-library.html"> * Support Library</a> * {@link android.support.v4.app.FragmentManager.FragmentLifecycleCallbacks} */ @Deprecated public abstract static class FragmentLifecycleCallbacks { /** * Called right before the fragment's {@link Fragment#onAttach(Context)} method is called. * This is a good time to inject any required dependencies for the fragment before any of * the fragment's lifecycle methods are invoked. * * @param fm Host FragmentManager * @param f Fragment changing state * @param context Context that the Fragment is being attached to */ public void onFragmentPreAttached(FragmentManager fm, Fragment f, Context context) { } /** * Called after the fragment has been attached to its host. Its host will have had * <code>onAttachFragment</code> called before this call happens. * * @param fm Host FragmentManager * @param f Fragment changing state * @param context Context that the Fragment was attached to */ public void onFragmentAttached(FragmentManager fm, Fragment f, Context context) { } /** * Called right before the fragment's {@link Fragment#onCreate(Bundle)} method is called. * This is a good time to inject any required dependencies or perform other configuration * for the fragment. * * @param fm Host FragmentManager * @param f Fragment changing state * @param savedInstanceState Saved instance bundle from a previous instance */ public void onFragmentPreCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onCreate(Bundle)}. This will only happen once for any given * fragment instance, though the fragment may be attached and detached multiple times. * * @param fm Host FragmentManager * @param f Fragment changing state * @param savedInstanceState Saved instance bundle from a previous instance */ public void onFragmentCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onActivityCreated(Bundle)}. This will only happen once for any given * fragment instance, though the fragment may be attached and detached multiple times. * * @param fm Host FragmentManager * @param f Fragment changing state * @param savedInstanceState Saved instance bundle from a previous instance */ public void onFragmentActivityCreated(FragmentManager fm, Fragment f, Bundle savedInstanceState) { } /** * Called after the fragment has returned a non-null view from the FragmentManager's * request to {@link Fragment#onCreateView(LayoutInflater, ViewGroup, Bundle)}. * * @param fm Host FragmentManager * @param f Fragment that created and owns the view * @param v View returned by the fragment * @param savedInstanceState Saved instance bundle from a previous instance */ public void onFragmentViewCreated(FragmentManager fm, Fragment f, View v, Bundle savedInstanceState) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onStart()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentStarted(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onResume()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentResumed(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onPause()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentPaused(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onStop()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentStopped(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onSaveInstanceState(Bundle)}. * * @param fm Host FragmentManager * @param f Fragment changing state * @param outState Saved state bundle for the fragment */ public void onFragmentSaveInstanceState(FragmentManager fm, Fragment f, Bundle outState) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onDestroyView()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentViewDestroyed(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onDestroy()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentDestroyed(FragmentManager fm, Fragment f) { } /** * Called after the fragment has returned from the FragmentManager's call to * {@link Fragment#onDetach()}. * * @param fm Host FragmentManager * @param f Fragment changing state */ public void onFragmentDetached(FragmentManager fm, Fragment f) { } } } final class FragmentManagerState implements Parcelable { FragmentState[] mActive; int[] mAdded; BackStackState[] mBackStack; int mPrimaryNavActiveIndex = -1; int mNextFragmentIndex; public FragmentManagerState() { } public FragmentManagerState(Parcel in) { mActive = in.createTypedArray(FragmentState.CREATOR); mAdded = in.createIntArray(); mBackStack = in.createTypedArray(BackStackState.CREATOR); mPrimaryNavActiveIndex = in.readInt(); mNextFragmentIndex = in.readInt(); } public int describeContents() { return 0; } public void writeToParcel(Parcel dest, int flags) { dest.writeTypedArray(mActive, flags); dest.writeIntArray(mAdded); dest.writeTypedArray(mBackStack, flags); dest.writeInt(mPrimaryNavActiveIndex); dest.writeInt(mNextFragmentIndex); } public static final Parcelable.Creator<FragmentManagerState> CREATOR = new Parcelable.Creator<FragmentManagerState>() { public FragmentManagerState createFromParcel(Parcel in) { return new FragmentManagerState(in); } public FragmentManagerState[] newArray(int size) { return new FragmentManagerState[size]; } }; } /** * Container for fragments associated with an activity. */ final class FragmentManagerImpl extends FragmentManager implements LayoutInflater.Factory2 { static boolean DEBUG = false; static final String TAG = "FragmentManager"; static final String TARGET_REQUEST_CODE_STATE_TAG = "android:target_req_state"; static final String TARGET_STATE_TAG = "android:target_state"; static final String VIEW_STATE_TAG = "android:view_state"; static final String USER_VISIBLE_HINT_TAG = "android:user_visible_hint"; static class AnimateOnHWLayerIfNeededListener implements Animator.AnimatorListener { private boolean mShouldRunOnHWLayer = false; private View mView; public AnimateOnHWLayerIfNeededListener(final View v) { if (v == null) { return; } mView = v; } @Override public void onAnimationStart(Animator animation) { mShouldRunOnHWLayer = shouldRunOnHWLayer(mView, animation); if (mShouldRunOnHWLayer) { mView.setLayerType(View.LAYER_TYPE_HARDWARE, null); } } @Override public void onAnimationEnd(Animator animation) { if (mShouldRunOnHWLayer) { mView.setLayerType(View.LAYER_TYPE_NONE, null); } mView = null; animation.removeListener(this); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } } ArrayList<OpGenerator> mPendingActions; boolean mExecutingActions; int mNextFragmentIndex = 0; @UnsupportedAppUsage SparseArray<Fragment> mActive; @UnsupportedAppUsage final ArrayList<Fragment> mAdded = new ArrayList<>(); ArrayList<BackStackRecord> mBackStack; ArrayList<Fragment> mCreatedMenus; // Must be accessed while locked. ArrayList<BackStackRecord> mBackStackIndices; ArrayList<Integer> mAvailBackStackIndices; ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; final CopyOnWriteArrayList<Pair<FragmentLifecycleCallbacks, Boolean>> mLifecycleCallbacks = new CopyOnWriteArrayList<>(); int mCurState = Fragment.INITIALIZING; FragmentHostCallback<?> mHost; FragmentContainer mContainer; Fragment mParent; Fragment mPrimaryNav; boolean mNeedMenuInvalidate; @UnsupportedAppUsage boolean mStateSaved; boolean mDestroyed; String mNoTransactionsBecause; boolean mHavePendingDeferredStart; // Temporary vars for removing redundant operations in BackStackRecords: ArrayList<BackStackRecord> mTmpRecords; ArrayList<Boolean> mTmpIsPop; ArrayList<Fragment> mTmpAddedFragments; // Temporary vars for state save and restore. Bundle mStateBundle = null; SparseArray<Parcelable> mStateArray = null; // Postponed transactions. ArrayList<StartEnterTransitionListener> mPostponedTransactions; // Prior to O, we allowed executing transactions during fragment manager state changes. // This is dangerous, but we want to keep from breaking old applications. boolean mAllowOldReentrantBehavior; // Saved FragmentManagerNonConfig during saveAllState() and cleared in noteStateNotSaved() FragmentManagerNonConfig mSavedNonConfig; Runnable mExecCommit = new Runnable() { @Override public void run() { execPendingActions(); } }; private void throwException(RuntimeException ex) { Log.e(TAG, ex.getMessage()); LogWriter logw = new LogWriter(Log.ERROR, TAG); PrintWriter pw = new FastPrintWriter(logw, false, 1024); if (mHost != null) { Log.e(TAG, "Activity state:"); try { mHost.onDump(" ", null, pw, new String[] {}); } catch (Exception e) { pw.flush(); Log.e(TAG, "Failed dumping state", e); } } else { Log.e(TAG, "Fragment manager state:"); try { dump(" ", null, pw, new String[] {}); } catch (Exception e) { pw.flush(); Log.e(TAG, "Failed dumping state", e); } } pw.flush(); throw ex; } static boolean modifiesAlpha(Animator anim) { if (anim == null) { return false; } if (anim instanceof ValueAnimator) { ValueAnimator valueAnim = (ValueAnimator) anim; PropertyValuesHolder[] values = valueAnim.getValues(); for (int i = 0; i < values.length; i++) { if (("alpha").equals(values[i].getPropertyName())) { return true; } } } else if (anim instanceof AnimatorSet) { List<Animator> animList = ((AnimatorSet) anim).getChildAnimations(); for (int i = 0; i < animList.size(); i++) { if (modifiesAlpha(animList.get(i))) { return true; } } } return false; } static boolean shouldRunOnHWLayer(View v, Animator anim) { if (v == null || anim == null) { return false; } return v.getLayerType() == View.LAYER_TYPE_NONE && v.hasOverlappingRendering() && modifiesAlpha(anim); } /** * Sets the to be animated view on hardware layer during the animation. */ private void setHWLayerAnimListenerIfAlpha(final View v, Animator anim) { if (v == null || anim == null) { return; } if (shouldRunOnHWLayer(v, anim)) { anim.addListener(new AnimateOnHWLayerIfNeededListener(v)); } } @Override public FragmentTransaction beginTransaction() { return new BackStackRecord(this); } @Override public boolean executePendingTransactions() { boolean updates = execPendingActions(); forcePostponedTransactions(); return updates; } @Override public void popBackStack() { enqueueAction(new PopBackStackState(null, -1, 0), false); } @Override public boolean popBackStackImmediate() { checkStateLoss(); return popBackStackImmediate(null, -1, 0); } @Override public void popBackStack(String name, int flags) { enqueueAction(new PopBackStackState(name, -1, flags), false); } @Override public boolean popBackStackImmediate(String name, int flags) { checkStateLoss(); return popBackStackImmediate(name, -1, flags); } @Override public void popBackStack(int id, int flags) { if (id < 0) { throw new IllegalArgumentException("Bad id: " + id); } enqueueAction(new PopBackStackState(null, id, flags), false); } @Override public boolean popBackStackImmediate(int id, int flags) { checkStateLoss(); if (id < 0) { throw new IllegalArgumentException("Bad id: " + id); } return popBackStackImmediate(null, id, flags); } /** * Used by all public popBackStackImmediate methods, this executes pending transactions and * returns true if the pop action did anything, regardless of what other pending * transactions did. * * @return true if the pop operation did anything or false otherwise. */ private boolean popBackStackImmediate(String name, int id, int flags) { execPendingActions(); ensureExecReady(true); if (mPrimaryNav != null // We have a primary nav fragment && id < 0 // No valid id (since they're local) && name == null) { // no name to pop to (since they're local) final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; if (childManager != null && childManager.popBackStackImmediate()) { // We did something, just not to this specific FragmentManager. Return true. return true; } } boolean executePop = popBackStackState(mTmpRecords, mTmpIsPop, name, id, flags); if (executePop) { mExecutingActions = true; try { removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); } finally { cleanupExec(); } } doPendingDeferredStart(); burpActive(); return executePop; } @Override public int getBackStackEntryCount() { return mBackStack != null ? mBackStack.size() : 0; } @Override public BackStackEntry getBackStackEntryAt(int index) { return mBackStack.get(index); } @Override public void addOnBackStackChangedListener(OnBackStackChangedListener listener) { if (mBackStackChangeListeners == null) { mBackStackChangeListeners = new ArrayList<OnBackStackChangedListener>(); } mBackStackChangeListeners.add(listener); } @Override public void removeOnBackStackChangedListener(OnBackStackChangedListener listener) { if (mBackStackChangeListeners != null) { mBackStackChangeListeners.remove(listener); } } @Override public void putFragment(Bundle bundle, String key, Fragment fragment) { if (fragment.mIndex < 0) { throwException( new IllegalStateException("Fragment " + fragment + " is not currently in the FragmentManager")); } bundle.putInt(key, fragment.mIndex); } @Override public Fragment getFragment(Bundle bundle, String key) { int index = bundle.getInt(key, -1); if (index == -1) { return null; } Fragment f = mActive.get(index); if (f == null) { throwException( new IllegalStateException("Fragment no longer exists for key " + key + ": index " + index)); } return f; } @Override public List<Fragment> getFragments() { if (mAdded.isEmpty()) { return Collections.EMPTY_LIST; } synchronized (mAdded) { return (List<Fragment>) mAdded.clone(); } } @Override public Fragment.SavedState saveFragmentInstanceState(Fragment fragment) { if (fragment.mIndex < 0) { throwException( new IllegalStateException("Fragment " + fragment + " is not currently in the FragmentManager")); } if (fragment.mState > Fragment.INITIALIZING) { Bundle result = saveFragmentBasicState(fragment); return result != null ? new Fragment.SavedState(result) : null; } return null; } @Override public boolean isDestroyed() { return mDestroyed; } @Override public String toString() { StringBuilder sb = new StringBuilder(128); sb.append("FragmentManager{"); sb.append(Integer.toHexString(System.identityHashCode(this))); sb.append(" in "); if (mParent != null) { DebugUtils.buildShortClassTag(mParent, sb); } else { DebugUtils.buildShortClassTag(mHost, sb); } sb.append("}}"); return sb.toString(); } @Override public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) { String innerPrefix = prefix + " "; int N; if (mActive != null) { N = mActive.size(); if (N > 0) { writer.print(prefix); writer.print("Active Fragments in "); writer.print(Integer.toHexString(System.identityHashCode(this))); writer.println(":"); for (int i = 0; i < N; i++) { Fragment f = mActive.valueAt(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(f); if (f != null) { f.dump(innerPrefix, fd, writer, args); } } } } N = mAdded.size(); if (N > 0) { writer.print(prefix); writer.println("Added Fragments:"); for (int i = 0; i < N; i++) { Fragment f = mAdded.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(f.toString()); } } if (mCreatedMenus != null) { N = mCreatedMenus.size(); if (N > 0) { writer.print(prefix); writer.println("Fragments Created Menus:"); for (int i = 0; i < N; i++) { Fragment f = mCreatedMenus.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(f.toString()); } } } if (mBackStack != null) { N = mBackStack.size(); if (N > 0) { writer.print(prefix); writer.println("Back Stack:"); for (int i = 0; i < N; i++) { BackStackRecord bs = mBackStack.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(bs.toString()); bs.dump(innerPrefix, fd, writer, args); } } } synchronized (this) { if (mBackStackIndices != null) { N = mBackStackIndices.size(); if (N > 0) { writer.print(prefix); writer.println("Back Stack Indices:"); for (int i = 0; i < N; i++) { BackStackRecord bs = mBackStackIndices.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(bs); } } } if (mAvailBackStackIndices != null && mAvailBackStackIndices.size() > 0) { writer.print(prefix); writer.print("mAvailBackStackIndices: "); writer.println(Arrays.toString(mAvailBackStackIndices.toArray())); } } if (mPendingActions != null) { N = mPendingActions.size(); if (N > 0) { writer.print(prefix); writer.println("Pending Actions:"); for (int i = 0; i < N; i++) { OpGenerator r = mPendingActions.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(r); } } } writer.print(prefix); writer.println("FragmentManager misc state:"); writer.print(prefix); writer.print(" mHost="); writer.println(mHost); writer.print(prefix); writer.print(" mContainer="); writer.println(mContainer); if (mParent != null) { writer.print(prefix); writer.print(" mParent="); writer.println(mParent); } writer.print(prefix); writer.print(" mCurState="); writer.print(mCurState); writer.print(" mStateSaved="); writer.print(mStateSaved); writer.print(" mDestroyed="); writer.println(mDestroyed); if (mNeedMenuInvalidate) { writer.print(prefix); writer.print(" mNeedMenuInvalidate="); writer.println(mNeedMenuInvalidate); } if (mNoTransactionsBecause != null) { writer.print(prefix); writer.print(" mNoTransactionsBecause="); writer.println(mNoTransactionsBecause); } } @UnsupportedAppUsage Animator loadAnimator(Fragment fragment, int transit, boolean enter, int transitionStyle) { Animator animObj = fragment.onCreateAnimator(transit, enter, fragment.getNextAnim()); if (animObj != null) { return animObj; } if (fragment.getNextAnim() != 0) { Animator anim = AnimatorInflater.loadAnimator(mHost.getContext(), fragment.getNextAnim()); if (anim != null) { return anim; } } if (transit == 0) { return null; } int styleIndex = transitToStyleIndex(transit, enter); if (styleIndex < 0) { return null; } if (transitionStyle == 0 && mHost.onHasWindowAnimations()) { transitionStyle = mHost.onGetWindowAnimations(); } if (transitionStyle == 0) { return null; } TypedArray attrs = mHost.getContext().obtainStyledAttributes(transitionStyle, com.android.internal.R.styleable.FragmentAnimation); int anim = attrs.getResourceId(styleIndex, 0); attrs.recycle(); if (anim == 0) { return null; } return AnimatorInflater.loadAnimator(mHost.getContext(), anim); } public void performPendingDeferredStart(Fragment f) { if (f.mDeferStart) { if (mExecutingActions) { // Wait until we're done executing our pending transactions mHavePendingDeferredStart = true; return; } f.mDeferStart = false; moveToState(f, mCurState, 0, 0, false); } } boolean isStateAtLeast(int state) { return mCurState >= state; } @SuppressWarnings("ReferenceEquality") void moveToState(Fragment f, int newState, int transit, int transitionStyle, boolean keepActive) { if (DEBUG && false) Log.v(TAG, "moveToState: " + f + " oldState=" + f.mState + " newState=" + newState + " mRemoving=" + f.mRemoving + " Callers=" + Debug.getCallers(5)); // Fragments that are not currently added will sit in the onCreate() state. if ((!f.mAdded || f.mDetached) && newState > Fragment.CREATED) { newState = Fragment.CREATED; } if (f.mRemoving && newState > f.mState) { if (f.mState == Fragment.INITIALIZING && f.isInBackStack()) { // Allow the fragment to be created so that it can be saved later. newState = Fragment.CREATED; } else { // While removing a fragment, we can't change it to a higher state. newState = f.mState; } } // Defer start if requested; don't allow it to move to STARTED or higher // if it's not already started. if (f.mDeferStart && f.mState < Fragment.STARTED && newState > Fragment.STOPPED) { newState = Fragment.STOPPED; } if (f.mState <= newState) { // For fragments that are created from a layout, when restoring from // state we don't want to allow them to be created until they are // being reloaded from the layout. if (f.mFromLayout && !f.mInLayout) { return; } if (f.getAnimatingAway() != null) { // The fragment is currently being animated... but! Now we // want to move our state back up. Give up on waiting for the // animation, move to whatever the final state should be once // the animation is done, and then we can proceed from there. f.setAnimatingAway(null); moveToState(f, f.getStateAfterAnimating(), 0, 0, true); } switch (f.mState) { case Fragment.INITIALIZING: if (newState > Fragment.INITIALIZING) { if (DEBUG) Log.v(TAG, "moveto CREATED: " + f); if (f.mSavedFragmentState != null) { f.mSavedViewState = f.mSavedFragmentState .getSparseParcelableArray(FragmentManagerImpl.VIEW_STATE_TAG); f.mTarget = getFragment(f.mSavedFragmentState, FragmentManagerImpl.TARGET_STATE_TAG); if (f.mTarget != null) { f.mTargetRequestCode = f.mSavedFragmentState .getInt(FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0); } f.mUserVisibleHint = f.mSavedFragmentState .getBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true); if (!f.mUserVisibleHint) { f.mDeferStart = true; if (newState > Fragment.STOPPED) { newState = Fragment.STOPPED; } } } f.mHost = mHost; f.mParentFragment = mParent; f.mFragmentManager = mParent != null ? mParent.mChildFragmentManager : mHost.getFragmentManagerImpl(); // If we have a target fragment, push it along to at least CREATED // so that this one can rely on it as an initialized dependency. if (f.mTarget != null) { if (mActive.get(f.mTarget.mIndex) != f.mTarget) { throw new IllegalStateException("Fragment " + f + " declared target fragment " + f.mTarget + " that does not belong to this FragmentManager!"); } if (f.mTarget.mState < Fragment.CREATED) { moveToState(f.mTarget, Fragment.CREATED, 0, 0, true); } } dispatchOnFragmentPreAttached(f, mHost.getContext(), false); f.mCalled = false; f.onAttach(mHost.getContext()); if (!f.mCalled) { throw new SuperNotCalledException( "Fragment " + f + " did not call through to super.onAttach()"); } if (f.mParentFragment == null) { mHost.onAttachFragment(f); } else { f.mParentFragment.onAttachFragment(f); } dispatchOnFragmentAttached(f, mHost.getContext(), false); if (!f.mIsCreated) { dispatchOnFragmentPreCreated(f, f.mSavedFragmentState, false); f.performCreate(f.mSavedFragmentState); dispatchOnFragmentCreated(f, f.mSavedFragmentState, false); } else { f.restoreChildFragmentState(f.mSavedFragmentState, true); f.mState = Fragment.CREATED; } f.mRetaining = false; } // fall through case Fragment.CREATED: // This is outside the if statement below on purpose; we want this to run // even if we do a moveToState from CREATED => *, CREATED => CREATED, and // * => CREATED as part of the case fallthrough above. ensureInflatedFragmentView(f); if (newState > Fragment.CREATED) { if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); if (!f.mFromLayout) { ViewGroup container = null; if (f.mContainerId != 0) { if (f.mContainerId == View.NO_ID) { throwException(new IllegalArgumentException( "Cannot create fragment " + f + " for a container view with no id")); } container = mContainer.onFindViewById(f.mContainerId); if (container == null && !f.mRestored) { String resName; try { resName = f.getResources().getResourceName(f.mContainerId); } catch (NotFoundException e) { resName = "unknown"; } throwException(new IllegalArgumentException( "No view found for id 0x" + Integer.toHexString(f.mContainerId) + " (" + resName + ") for fragment " + f)); } } f.mContainer = container; f.mView = f.performCreateView(f.performGetLayoutInflater(f.mSavedFragmentState), container, f.mSavedFragmentState); if (f.mView != null) { f.mView.setSaveFromParentEnabled(false); if (container != null) { container.addView(f.mView); } if (f.mHidden) { f.mView.setVisibility(View.GONE); } f.onViewCreated(f.mView, f.mSavedFragmentState); dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); // Only animate the view if it is visible. This is done after // dispatchOnFragmentViewCreated in case visibility is changed f.mIsNewlyAdded = (f.mView.getVisibility() == View.VISIBLE) && f.mContainer != null; } } f.performActivityCreated(f.mSavedFragmentState); dispatchOnFragmentActivityCreated(f, f.mSavedFragmentState, false); if (f.mView != null) { f.restoreViewState(f.mSavedFragmentState); } f.mSavedFragmentState = null; } // fall through case Fragment.ACTIVITY_CREATED: if (newState > Fragment.ACTIVITY_CREATED) { f.mState = Fragment.STOPPED; } // fall through case Fragment.STOPPED: if (newState > Fragment.STOPPED) { if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); f.performStart(); dispatchOnFragmentStarted(f, false); } // fall through case Fragment.STARTED: if (newState > Fragment.STARTED) { if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); f.performResume(); dispatchOnFragmentResumed(f, false); // Get rid of this in case we saved it and never needed it. f.mSavedFragmentState = null; f.mSavedViewState = null; } } } else if (f.mState > newState) { switch (f.mState) { case Fragment.RESUMED: if (newState < Fragment.RESUMED) { if (DEBUG) Log.v(TAG, "movefrom RESUMED: " + f); f.performPause(); dispatchOnFragmentPaused(f, false); } // fall through case Fragment.STARTED: if (newState < Fragment.STARTED) { if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); f.performStop(); dispatchOnFragmentStopped(f, false); } // fall through case Fragment.STOPPED: case Fragment.ACTIVITY_CREATED: if (newState < Fragment.ACTIVITY_CREATED) { if (DEBUG) Log.v(TAG, "movefrom ACTIVITY_CREATED: " + f); if (f.mView != null) { // Need to save the current view state if not // done already. if (mHost.onShouldSaveFragmentState(f) && f.mSavedViewState == null) { saveFragmentViewState(f); } } f.performDestroyView(); dispatchOnFragmentViewDestroyed(f, false); if (f.mView != null && f.mContainer != null) { if (getTargetSdk() >= Build.VERSION_CODES.O) { // Stop any current animations: f.mView.clearAnimation(); f.mContainer.endViewTransition(f.mView); } Animator anim = null; if (mCurState > Fragment.INITIALIZING && !mDestroyed && f.mView.getVisibility() == View.VISIBLE && f.mView.getTransitionAlpha() > 0) { anim = loadAnimator(f, transit, false, transitionStyle); } f.mView.setTransitionAlpha(1f); if (anim != null) { final ViewGroup container = f.mContainer; final View view = f.mView; final Fragment fragment = f; container.startViewTransition(view); f.setAnimatingAway(anim); f.setStateAfterAnimating(newState); anim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator anim) { container.endViewTransition(view); Animator animator = f.getAnimatingAway(); f.setAnimatingAway(null); // If the animation finished immediately, the fragment's // view will still be there. If so, we can just pretend // there was no animation and skip the moveToState() if (container.indexOfChild(view) == -1 && animator != null) { moveToState(fragment, fragment.getStateAfterAnimating(), 0, 0, false); } } }); anim.setTarget(f.mView); setHWLayerAnimListenerIfAlpha(f.mView, anim); anim.start(); } f.mContainer.removeView(f.mView); } f.mContainer = null; f.mView = null; f.mInLayout = false; } // fall through case Fragment.CREATED: if (newState < Fragment.CREATED) { if (mDestroyed) { if (f.getAnimatingAway() != null) { // The fragment's containing activity is // being destroyed, but this fragment is // currently animating away. Stop the // animation right now -- it is not needed, // and we can't wait any more on destroying // the fragment. Animator anim = f.getAnimatingAway(); f.setAnimatingAway(null); anim.cancel(); } } if (f.getAnimatingAway() != null) { // We are waiting for the fragment's view to finish // animating away. Just make a note of the state // the fragment now should move to once the animation // is done. f.setStateAfterAnimating(newState); newState = Fragment.CREATED; } else { if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); if (!f.mRetaining) { f.performDestroy(); dispatchOnFragmentDestroyed(f, false); } else { f.mState = Fragment.INITIALIZING; } f.performDetach(); dispatchOnFragmentDetached(f, false); if (!keepActive) { if (!f.mRetaining) { makeInactive(f); } else { f.mHost = null; f.mParentFragment = null; f.mFragmentManager = null; } } } } } } if (f.mState != newState) { Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; " + "expected state " + newState + " found " + f.mState); f.mState = newState; } } void moveToState(Fragment f) { moveToState(f, mCurState, 0, 0, false); } void ensureInflatedFragmentView(Fragment f) { if (f.mFromLayout && !f.mPerformedCreateView) { f.mView = f.performCreateView(f.performGetLayoutInflater(f.mSavedFragmentState), null, f.mSavedFragmentState); if (f.mView != null) { f.mView.setSaveFromParentEnabled(false); if (f.mHidden) f.mView.setVisibility(View.GONE); f.onViewCreated(f.mView, f.mSavedFragmentState); dispatchOnFragmentViewCreated(f, f.mView, f.mSavedFragmentState, false); } } } /** * Fragments that have been shown or hidden don't have their visibility changed or * animations run during the {@link #showFragment(Fragment)} or {@link #hideFragment(Fragment)} * calls. After fragments are brought to their final state in * {@link #moveFragmentToExpectedState(Fragment)} the fragments that have been shown or * hidden must have their visibility changed and their animations started here. * * @param fragment The fragment with mHiddenChanged = true that should change its View's * visibility and start the show or hide animation. */ void completeShowHideFragment(final Fragment fragment) { if (fragment.mView != null) { Animator anim = loadAnimator(fragment, fragment.getNextTransition(), !fragment.mHidden, fragment.getNextTransitionStyle()); if (anim != null) { anim.setTarget(fragment.mView); if (fragment.mHidden) { if (fragment.isHideReplaced()) { fragment.setHideReplaced(false); } else { final ViewGroup container = fragment.mContainer; final View animatingView = fragment.mView; if (container != null) { container.startViewTransition(animatingView); } // Delay the actual hide operation until the animation finishes, otherwise // the fragment will just immediately disappear anim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { if (container != null) { container.endViewTransition(animatingView); } animation.removeListener(this); animatingView.setVisibility(View.GONE); } }); } } else { fragment.mView.setVisibility(View.VISIBLE); } setHWLayerAnimListenerIfAlpha(fragment.mView, anim); anim.start(); } else { final int visibility = fragment.mHidden && !fragment.isHideReplaced() ? View.GONE : View.VISIBLE; fragment.mView.setVisibility(visibility); if (fragment.isHideReplaced()) { fragment.setHideReplaced(false); } } } if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.mHiddenChanged = false; fragment.onHiddenChanged(fragment.mHidden); } /** * Moves a fragment to its expected final state or the fragment manager's state, depending * on whether the fragment manager's state is raised properly. * * @param f The fragment to change. */ void moveFragmentToExpectedState(final Fragment f) { if (f == null) { return; } int nextState = mCurState; if (f.mRemoving) { if (f.isInBackStack()) { nextState = Math.min(nextState, Fragment.CREATED); } else { nextState = Math.min(nextState, Fragment.INITIALIZING); } } moveToState(f, nextState, f.getNextTransition(), f.getNextTransitionStyle(), false); if (f.mView != null) { // Move the view if it is out of order Fragment underFragment = findFragmentUnder(f); if (underFragment != null) { final View underView = underFragment.mView; // make sure this fragment is in the right order. final ViewGroup container = f.mContainer; int underIndex = container.indexOfChild(underView); int viewIndex = container.indexOfChild(f.mView); if (viewIndex < underIndex) { container.removeViewAt(viewIndex); container.addView(f.mView, underIndex); } } if (f.mIsNewlyAdded && f.mContainer != null) { // Make it visible and run the animations f.mView.setTransitionAlpha(1f); f.mIsNewlyAdded = false; // run animations: Animator anim = loadAnimator(f, f.getNextTransition(), true, f.getNextTransitionStyle()); if (anim != null) { anim.setTarget(f.mView); setHWLayerAnimListenerIfAlpha(f.mView, anim); anim.start(); } } } if (f.mHiddenChanged) { completeShowHideFragment(f); } } /** * Changes the state of the fragment manager to {@code newState}. If the fragment manager * changes state or {@code always} is {@code true}, any fragments within it have their * states updated as well. * * @param newState The new state for the fragment manager * @param always If {@code true}, all fragments update their state, even * if {@code newState} matches the current fragment manager's state. */ void moveToState(int newState, boolean always) { if (mHost == null && newState != Fragment.INITIALIZING) { throw new IllegalStateException("No activity"); } if (!always && mCurState == newState) { return; } mCurState = newState; if (mActive != null) { boolean loadersRunning = false; // Must add them in the proper order. mActive fragments may be out of order final int numAdded = mAdded.size(); for (int i = 0; i < numAdded; i++) { Fragment f = mAdded.get(i); moveFragmentToExpectedState(f); if (f.mLoaderManager != null) { loadersRunning |= f.mLoaderManager.hasRunningLoaders(); } } // Now iterate through all active fragments. These will include those that are removed // and detached. final int numActive = mActive.size(); for (int i = 0; i < numActive; i++) { Fragment f = mActive.valueAt(i); if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) { moveFragmentToExpectedState(f); if (f.mLoaderManager != null) { loadersRunning |= f.mLoaderManager.hasRunningLoaders(); } } } if (!loadersRunning) { startPendingDeferredFragments(); } if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) { mHost.onInvalidateOptionsMenu(); mNeedMenuInvalidate = false; } } } void startPendingDeferredFragments() { if (mActive == null) return; for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.valueAt(i); if (f != null) { performPendingDeferredStart(f); } } } void makeActive(Fragment f) { if (f.mIndex >= 0) { return; } f.setIndex(mNextFragmentIndex++, mParent); if (mActive == null) { mActive = new SparseArray<>(); } mActive.put(f.mIndex, f); if (DEBUG) Log.v(TAG, "Allocated fragment index " + f); } void makeInactive(Fragment f) { if (f.mIndex < 0) { return; } if (DEBUG) Log.v(TAG, "Freeing fragment index " + f); // Don't remove yet. That happens in burpActive(). This prevents // concurrent modification while iterating over mActive mActive.put(f.mIndex, null); mHost.inactivateFragment(f.mWho); f.initState(); } public void addFragment(Fragment fragment, boolean moveToStateNow) { if (DEBUG) Log.v(TAG, "add: " + fragment); makeActive(fragment); if (!fragment.mDetached) { if (mAdded.contains(fragment)) { throw new IllegalStateException("Fragment already added: " + fragment); } synchronized (mAdded) { mAdded.add(fragment); } fragment.mAdded = true; fragment.mRemoving = false; if (fragment.mView == null) { fragment.mHiddenChanged = false; } if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } if (moveToStateNow) { moveToState(fragment); } } } public void removeFragment(Fragment fragment) { if (DEBUG) Log.v(TAG, "remove: " + fragment + " nesting=" + fragment.mBackStackNesting); final boolean inactive = !fragment.isInBackStack(); if (!fragment.mDetached || inactive) { if (false) { // Would be nice to catch a bad remove here, but we need // time to test this to make sure we aren't crashes cases // where it is not a problem. if (!mAdded.contains(fragment)) { throw new IllegalStateException("Fragment not added: " + fragment); } } synchronized (mAdded) { mAdded.remove(fragment); } if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.mAdded = false; fragment.mRemoving = true; } } /** * Marks a fragment as hidden to be later animated in with * {@link #completeShowHideFragment(Fragment)}. * * @param fragment The fragment to be shown. */ public void hideFragment(Fragment fragment) { if (DEBUG) Log.v(TAG, "hide: " + fragment); if (!fragment.mHidden) { fragment.mHidden = true; // Toggle hidden changed so that if a fragment goes through show/hide/show // it doesn't go through the animation. fragment.mHiddenChanged = !fragment.mHiddenChanged; } } /** * Marks a fragment as shown to be later animated in with * {@link #completeShowHideFragment(Fragment)}. * * @param fragment The fragment to be shown. */ public void showFragment(Fragment fragment) { if (DEBUG) Log.v(TAG, "show: " + fragment); if (fragment.mHidden) { fragment.mHidden = false; // Toggle hidden changed so that if a fragment goes through show/hide/show // it doesn't go through the animation. fragment.mHiddenChanged = !fragment.mHiddenChanged; } } public void detachFragment(Fragment fragment) { if (DEBUG) Log.v(TAG, "detach: " + fragment); if (!fragment.mDetached) { fragment.mDetached = true; if (fragment.mAdded) { // We are not already in back stack, so need to remove the fragment. if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); synchronized (mAdded) { mAdded.remove(fragment); } if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.mAdded = false; } } } public void attachFragment(Fragment fragment) { if (DEBUG) Log.v(TAG, "attach: " + fragment); if (fragment.mDetached) { fragment.mDetached = false; if (!fragment.mAdded) { if (mAdded.contains(fragment)) { throw new IllegalStateException("Fragment already added: " + fragment); } if (DEBUG) Log.v(TAG, "add from attach: " + fragment); synchronized (mAdded) { mAdded.add(fragment); } fragment.mAdded = true; if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } } } } public Fragment findFragmentById(int id) { // First look through added fragments. for (int i = mAdded.size() - 1; i >= 0; i--) { Fragment f = mAdded.get(i); if (f != null && f.mFragmentId == id) { return f; } } if (mActive != null) { // Now for any known fragment. for (int i = mActive.size() - 1; i >= 0; i--) { Fragment f = mActive.valueAt(i); if (f != null && f.mFragmentId == id) { return f; } } } return null; } public Fragment findFragmentByTag(String tag) { if (tag != null) { // First look through added fragments. for (int i = mAdded.size() - 1; i >= 0; i--) { Fragment f = mAdded.get(i); if (f != null && tag.equals(f.mTag)) { return f; } } } if (mActive != null && tag != null) { // Now for any known fragment. for (int i = mActive.size() - 1; i >= 0; i--) { Fragment f = mActive.valueAt(i); if (f != null && tag.equals(f.mTag)) { return f; } } } return null; } public Fragment findFragmentByWho(String who) { if (mActive != null && who != null) { for (int i = mActive.size() - 1; i >= 0; i--) { Fragment f = mActive.valueAt(i); if (f != null && (f = f.findFragmentByWho(who)) != null) { return f; } } } return null; } private void checkStateLoss() { if (mStateSaved) { throw new IllegalStateException("Can not perform this action after onSaveInstanceState"); } if (mNoTransactionsBecause != null) { throw new IllegalStateException("Can not perform this action inside of " + mNoTransactionsBecause); } } @Override public boolean isStateSaved() { return mStateSaved; } /** * Adds an action to the queue of pending actions. * * @param action the action to add * @param allowStateLoss whether to allow loss of state information * @throws IllegalStateException if the activity has been destroyed */ public void enqueueAction(OpGenerator action, boolean allowStateLoss) { if (!allowStateLoss) { checkStateLoss(); } synchronized (this) { if (mDestroyed || mHost == null) { if (allowStateLoss) { // This FragmentManager isn't attached, so drop the entire transaction. return; } throw new IllegalStateException("Activity has been destroyed"); } if (mPendingActions == null) { mPendingActions = new ArrayList<>(); } mPendingActions.add(action); scheduleCommit(); } } /** * Schedules the execution when one hasn't been scheduled already. This should happen * the first time {@link #enqueueAction(OpGenerator, boolean)} is called or when * a postponed transaction has been started with * {@link Fragment#startPostponedEnterTransition()} */ private void scheduleCommit() { synchronized (this) { boolean postponeReady = mPostponedTransactions != null && !mPostponedTransactions.isEmpty(); boolean pendingReady = mPendingActions != null && mPendingActions.size() == 1; if (postponeReady || pendingReady) { mHost.getHandler().removeCallbacks(mExecCommit); mHost.getHandler().post(mExecCommit); } } } public int allocBackStackIndex(BackStackRecord bse) { synchronized (this) { if (mAvailBackStackIndices == null || mAvailBackStackIndices.size() <= 0) { if (mBackStackIndices == null) { mBackStackIndices = new ArrayList<BackStackRecord>(); } int index = mBackStackIndices.size(); if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); mBackStackIndices.add(bse); return index; } else { int index = mAvailBackStackIndices.remove(mAvailBackStackIndices.size() - 1); if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); mBackStackIndices.set(index, bse); return index; } } } public void setBackStackIndex(int index, BackStackRecord bse) { synchronized (this) { if (mBackStackIndices == null) { mBackStackIndices = new ArrayList<BackStackRecord>(); } int N = mBackStackIndices.size(); if (index < N) { if (DEBUG) Log.v(TAG, "Setting back stack index " + index + " to " + bse); mBackStackIndices.set(index, bse); } else { while (N < index) { mBackStackIndices.add(null); if (mAvailBackStackIndices == null) { mAvailBackStackIndices = new ArrayList<Integer>(); } if (DEBUG) Log.v(TAG, "Adding available back stack index " + N); mAvailBackStackIndices.add(N); N++; } if (DEBUG) Log.v(TAG, "Adding back stack index " + index + " with " + bse); mBackStackIndices.add(bse); } } } public void freeBackStackIndex(int index) { synchronized (this) { mBackStackIndices.set(index, null); if (mAvailBackStackIndices == null) { mAvailBackStackIndices = new ArrayList<Integer>(); } if (DEBUG) Log.v(TAG, "Freeing back stack index " + index); mAvailBackStackIndices.add(index); } } /** * Broken out from exec*, this prepares for gathering and executing operations. * * @param allowStateLoss true if state loss should be ignored or false if it should be * checked. */ private void ensureExecReady(boolean allowStateLoss) { if (mExecutingActions) { throw new IllegalStateException("FragmentManager is already executing transactions"); } if (Looper.myLooper() != mHost.getHandler().getLooper()) { throw new IllegalStateException("Must be called from main thread of fragment host"); } if (!allowStateLoss) { checkStateLoss(); } if (mTmpRecords == null) { mTmpRecords = new ArrayList<>(); mTmpIsPop = new ArrayList<>(); } mExecutingActions = true; try { executePostponedTransaction(null, null); } finally { mExecutingActions = false; } } public void execSingleAction(OpGenerator action, boolean allowStateLoss) { if (allowStateLoss && (mHost == null || mDestroyed)) { // This FragmentManager isn't attached, so drop the entire transaction. return; } ensureExecReady(allowStateLoss); if (action.generateOps(mTmpRecords, mTmpIsPop)) { mExecutingActions = true; try { removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); } finally { cleanupExec(); } } doPendingDeferredStart(); burpActive(); } /** * Broken out of exec*, this cleans up the mExecutingActions and the temporary structures * used in executing operations. */ private void cleanupExec() { mExecutingActions = false; mTmpIsPop.clear(); mTmpRecords.clear(); } /** * Only call from main thread! */ public boolean execPendingActions() { ensureExecReady(true); boolean didSomething = false; while (generateOpsForPendingActions(mTmpRecords, mTmpIsPop)) { mExecutingActions = true; try { removeRedundantOperationsAndExecute(mTmpRecords, mTmpIsPop); } finally { cleanupExec(); } didSomething = true; } doPendingDeferredStart(); burpActive(); return didSomething; } /** * Complete the execution of transactions that have previously been postponed, but are * now ready. */ private void executePostponedTransaction(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop) { int numPostponed = mPostponedTransactions == null ? 0 : mPostponedTransactions.size(); for (int i = 0; i < numPostponed; i++) { StartEnterTransitionListener listener = mPostponedTransactions.get(i); if (records != null && !listener.mIsBack) { int index = records.indexOf(listener.mRecord); if (index != -1 && isRecordPop.get(index)) { listener.cancelTransaction(); continue; } } if (listener.isReady() || (records != null && listener.mRecord.interactsWith(records, 0, records.size()))) { mPostponedTransactions.remove(i); i--; numPostponed--; int index; if (records != null && !listener.mIsBack && (index = records.indexOf(listener.mRecord)) != -1 && isRecordPop.get(index)) { // This is popping a postponed transaction listener.cancelTransaction(); } else { listener.completeTransaction(); } } } } /** * Remove redundant BackStackRecord operations and executes them. This method merges operations * of proximate records that allow reordering. See * {@link FragmentTransaction#setReorderingAllowed(boolean)}. * <p> * For example, a transaction that adds to the back stack and then another that pops that * back stack record will be optimized to remove the unnecessary operation. * <p> * Likewise, two transactions committed that are executed at the same time will be optimized * to remove the redundant operations as well as two pop operations executed together. * * @param records The records pending execution * @param isRecordPop The direction that these records are being run. */ private void removeRedundantOperationsAndExecute(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop) { if (records == null || records.isEmpty()) { return; } if (isRecordPop == null || records.size() != isRecordPop.size()) { throw new IllegalStateException("Internal error with the back stack records"); } // Force start of any postponed transactions that interact with scheduled transactions: executePostponedTransaction(records, isRecordPop); final int numRecords = records.size(); int startIndex = 0; for (int recordNum = 0; recordNum < numRecords; recordNum++) { final boolean canReorder = records.get(recordNum).mReorderingAllowed; if (!canReorder) { // execute all previous transactions if (startIndex != recordNum) { executeOpsTogether(records, isRecordPop, startIndex, recordNum); } // execute all pop operations that don't allow reordering together or // one add operation int reorderingEnd = recordNum + 1; if (isRecordPop.get(recordNum)) { while (reorderingEnd < numRecords && isRecordPop.get(reorderingEnd) && !records.get(reorderingEnd).mReorderingAllowed) { reorderingEnd++; } } executeOpsTogether(records, isRecordPop, recordNum, reorderingEnd); startIndex = reorderingEnd; recordNum = reorderingEnd - 1; } } if (startIndex != numRecords) { executeOpsTogether(records, isRecordPop, startIndex, numRecords); } } /** * Executes a subset of a list of BackStackRecords, all of which either allow reordering or * do not allow ordering. * @param records A list of BackStackRecords that are to be executed together * @param isRecordPop The direction that these records are being run. * @param startIndex The index of the first record in <code>records</code> to be executed * @param endIndex One more than the final record index in <code>records</code> to executed. */ private void executeOpsTogether(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { final boolean allowReordering = records.get(startIndex).mReorderingAllowed; boolean addToBackStack = false; if (mTmpAddedFragments == null) { mTmpAddedFragments = new ArrayList<>(); } else { mTmpAddedFragments.clear(); } mTmpAddedFragments.addAll(mAdded); Fragment oldPrimaryNav = getPrimaryNavigationFragment(); for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { final BackStackRecord record = records.get(recordNum); final boolean isPop = isRecordPop.get(recordNum); if (!isPop) { oldPrimaryNav = record.expandOps(mTmpAddedFragments, oldPrimaryNav); } else { record.trackAddedFragmentsInPop(mTmpAddedFragments); } addToBackStack = addToBackStack || record.mAddToBackStack; } mTmpAddedFragments.clear(); if (!allowReordering) { FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, endIndex, false); } executeOps(records, isRecordPop, startIndex, endIndex); int postponeIndex = endIndex; if (allowReordering) { ArraySet<Fragment> addedFragments = new ArraySet<>(); addAddedFragments(addedFragments); postponeIndex = postponePostponableTransactions(records, isRecordPop, startIndex, endIndex, addedFragments); makeRemovedFragmentsInvisible(addedFragments); } if (postponeIndex != startIndex && allowReordering) { // need to run something now FragmentTransition.startTransitions(this, records, isRecordPop, startIndex, postponeIndex, true); moveToState(mCurState, true); } for (int recordNum = startIndex; recordNum < endIndex; recordNum++) { final BackStackRecord record = records.get(recordNum); final boolean isPop = isRecordPop.get(recordNum); if (isPop && record.mIndex >= 0) { freeBackStackIndex(record.mIndex); record.mIndex = -1; } record.runOnCommitRunnables(); } if (addToBackStack) { reportBackStackChanged(); } } /** * Any fragments that were removed because they have been postponed should have their views * made invisible by setting their transition alpha to 0. * * @param fragments The fragments that were added during operation execution. Only the ones * that are no longer added will have their transition alpha changed. */ private void makeRemovedFragmentsInvisible(ArraySet<Fragment> fragments) { final int numAdded = fragments.size(); for (int i = 0; i < numAdded; i++) { final Fragment fragment = fragments.valueAt(i); if (!fragment.mAdded) { final View view = fragment.getView(); view.setTransitionAlpha(0f); } } } /** * Examine all transactions and determine which ones are marked as postponed. Those will * have their operations rolled back and moved to the end of the record list (up to endIndex). * It will also add the postponed transaction to the queue. * * @param records A list of BackStackRecords that should be checked. * @param isRecordPop The direction that these records are being run. * @param startIndex The index of the first record in <code>records</code> to be checked * @param endIndex One more than the final record index in <code>records</code> to be checked. * @return The index of the first postponed transaction or endIndex if no transaction was * postponed. */ private int postponePostponableTransactions(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, int startIndex, int endIndex, ArraySet<Fragment> added) { int postponeIndex = endIndex; for (int i = endIndex - 1; i >= startIndex; i--) { final BackStackRecord record = records.get(i); final boolean isPop = isRecordPop.get(i); boolean isPostponed = record.isPostponed() && !record.interactsWith(records, i + 1, endIndex); if (isPostponed) { if (mPostponedTransactions == null) { mPostponedTransactions = new ArrayList<>(); } StartEnterTransitionListener listener = new StartEnterTransitionListener(record, isPop); mPostponedTransactions.add(listener); record.setOnStartPostponedListener(listener); // roll back the transaction if (isPop) { record.executeOps(); } else { record.executePopOps(false); } // move to the end postponeIndex--; if (i != postponeIndex) { records.remove(i); records.add(postponeIndex, record); } // different views may be visible now addAddedFragments(added); } } return postponeIndex; } /** * When a postponed transaction is ready to be started, this completes the transaction, * removing, hiding, or showing views as well as starting the animations and transitions. * <p> * {@code runtransitions} is set to false when the transaction postponement was interrupted * abnormally -- normally by a new transaction being started that affects the postponed * transaction. * * @param record The transaction to run * @param isPop true if record is popping or false if it is adding * @param runTransitions true if the fragment transition should be run or false otherwise. * @param moveToState true if the state should be changed after executing the operations. * This is false when the transaction is canceled when a postponed * transaction is popped. */ private void completeExecute(BackStackRecord record, boolean isPop, boolean runTransitions, boolean moveToState) { if (isPop) { record.executePopOps(moveToState); } else { record.executeOps(); } ArrayList<BackStackRecord> records = new ArrayList<>(1); ArrayList<Boolean> isRecordPop = new ArrayList<>(1); records.add(record); isRecordPop.add(isPop); if (runTransitions) { FragmentTransition.startTransitions(this, records, isRecordPop, 0, 1, true); } if (moveToState) { moveToState(mCurState, true); } if (mActive != null) { final int numActive = mActive.size(); for (int i = 0; i < numActive; i++) { // Allow added fragments to be removed during the pop since we aren't going // to move them to the final state with moveToState(mCurState). Fragment fragment = mActive.valueAt(i); if (fragment != null && fragment.mView != null && fragment.mIsNewlyAdded && record.interactsWith(fragment.mContainerId)) { fragment.mIsNewlyAdded = false; } } } } /** * Find a fragment within the fragment's container whose View should be below the passed * fragment. {@code null} is returned when the fragment has no View or if there should be * no fragment with a View below the given fragment. * * As an example, if mAdded has two Fragments with Views sharing the same container: * FragmentA * FragmentB * * Then, when processing FragmentB, FragmentA will be returned. If, however, FragmentA * had no View, null would be returned. * * @param f The fragment that may be on top of another fragment. * @return The fragment with a View under f, if one exists or null if f has no View or * there are no fragments with Views in the same container. */ private Fragment findFragmentUnder(Fragment f) { final ViewGroup container = f.mContainer; final View view = f.mView; if (container == null || view == null) { return null; } final int fragmentIndex = mAdded.indexOf(f); for (int i = fragmentIndex - 1; i >= 0; i--) { Fragment underFragment = mAdded.get(i); if (underFragment.mContainer == container && underFragment.mView != null) { // Found the fragment under this one return underFragment; } } return null; } /** * Run the operations in the BackStackRecords, either to push or pop. * * @param records The list of records whose operations should be run. * @param isRecordPop The direction that these records are being run. * @param startIndex The index of the first entry in records to run. * @param endIndex One past the index of the final entry in records to run. */ private static void executeOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, int startIndex, int endIndex) { for (int i = startIndex; i < endIndex; i++) { final BackStackRecord record = records.get(i); final boolean isPop = isRecordPop.get(i); if (isPop) { record.bumpBackStackNesting(-1); // Only execute the add operations at the end of // all transactions. boolean moveToState = i == (endIndex - 1); record.executePopOps(moveToState); } else { record.bumpBackStackNesting(1); record.executeOps(); } } } /** * Ensure that fragments that are added are moved to at least the CREATED state. * Any newly-added Views are inserted into {@code added} so that the Transaction can be * postponed with {@link Fragment#postponeEnterTransition()}. They will later be made * invisible by changing their transitionAlpha to 0 if they have been removed when postponed. */ private void addAddedFragments(ArraySet<Fragment> added) { if (mCurState < Fragment.CREATED) { return; } // We want to leave the fragment in the started state final int state = Math.min(mCurState, Fragment.STARTED); final int numAdded = mAdded.size(); for (int i = 0; i < numAdded; i++) { Fragment fragment = mAdded.get(i); if (fragment.mState < state) { moveToState(fragment, state, fragment.getNextAnim(), fragment.getNextTransition(), false); if (fragment.mView != null && !fragment.mHidden && fragment.mIsNewlyAdded) { added.add(fragment); } } } } /** * Starts all postponed transactions regardless of whether they are ready or not. */ private void forcePostponedTransactions() { if (mPostponedTransactions != null) { while (!mPostponedTransactions.isEmpty()) { mPostponedTransactions.remove(0).completeTransaction(); } } } /** * Ends the animations of fragments so that they immediately reach the end state. * This is used prior to saving the state so that the correct state is saved. */ private void endAnimatingAwayFragments() { final int numFragments = mActive == null ? 0 : mActive.size(); for (int i = 0; i < numFragments; i++) { Fragment fragment = mActive.valueAt(i); if (fragment != null && fragment.getAnimatingAway() != null) { // Give up waiting for the animation and just end it. fragment.getAnimatingAway().end(); } } } /** * Adds all records in the pending actions to records and whether they are add or pop * operations to isPop. After executing, the pending actions will be empty. * * @param records All pending actions will generate BackStackRecords added to this. * This contains the transactions, in order, to execute. * @param isPop All pending actions will generate booleans to add to this. This contains * an entry for each entry in records to indicate whether or not it is a * pop action. */ private boolean generateOpsForPendingActions(ArrayList<BackStackRecord> records, ArrayList<Boolean> isPop) { boolean didSomething = false; synchronized (this) { if (mPendingActions == null || mPendingActions.size() == 0) { return false; } final int numActions = mPendingActions.size(); for (int i = 0; i < numActions; i++) { didSomething |= mPendingActions.get(i).generateOps(records, isPop); } mPendingActions.clear(); mHost.getHandler().removeCallbacks(mExecCommit); } return didSomething; } void doPendingDeferredStart() { if (mHavePendingDeferredStart) { boolean loadersRunning = false; for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.valueAt(i); if (f != null && f.mLoaderManager != null) { loadersRunning |= f.mLoaderManager.hasRunningLoaders(); } } if (!loadersRunning) { mHavePendingDeferredStart = false; startPendingDeferredFragments(); } } } void reportBackStackChanged() { if (mBackStackChangeListeners != null) { for (int i = 0; i < mBackStackChangeListeners.size(); i++) { mBackStackChangeListeners.get(i).onBackStackChanged(); } } } void addBackStackState(BackStackRecord state) { if (mBackStack == null) { mBackStack = new ArrayList<BackStackRecord>(); } mBackStack.add(state); } boolean popBackStackState(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop, String name, int id, int flags) { if (mBackStack == null) { return false; } if (name == null && id < 0 && (flags & POP_BACK_STACK_INCLUSIVE) == 0) { int last = mBackStack.size() - 1; if (last < 0) { return false; } records.add(mBackStack.remove(last)); isRecordPop.add(true); } else { int index = -1; if (name != null || id >= 0) { // If a name or ID is specified, look for that place in // the stack. index = mBackStack.size() - 1; while (index >= 0) { BackStackRecord bss = mBackStack.get(index); if (name != null && name.equals(bss.getName())) { break; } if (id >= 0 && id == bss.mIndex) { break; } index--; } if (index < 0) { return false; } if ((flags & POP_BACK_STACK_INCLUSIVE) != 0) { index--; // Consume all following entries that match. while (index >= 0) { BackStackRecord bss = mBackStack.get(index); if ((name != null && name.equals(bss.getName())) || (id >= 0 && id == bss.mIndex)) { index--; continue; } break; } } } if (index == mBackStack.size() - 1) { return false; } for (int i = mBackStack.size() - 1; i > index; i--) { records.add(mBackStack.remove(i)); isRecordPop.add(true); } } return true; } FragmentManagerNonConfig retainNonConfig() { setRetaining(mSavedNonConfig); return mSavedNonConfig; } /** * Recurse the FragmentManagerNonConfig fragments and set the mRetaining to true. This * was previously done while saving the non-config state, but that has been moved to * {@link #saveNonConfig()} called from {@link #saveAllState()}. If mRetaining is set too * early, the fragment won't be destroyed when the FragmentManager is destroyed. */ private static void setRetaining(FragmentManagerNonConfig nonConfig) { if (nonConfig == null) { return; } List<Fragment> fragments = nonConfig.getFragments(); if (fragments != null) { for (Fragment fragment : fragments) { fragment.mRetaining = true; } } List<FragmentManagerNonConfig> children = nonConfig.getChildNonConfigs(); if (children != null) { for (FragmentManagerNonConfig child : children) { setRetaining(child); } } } void saveNonConfig() { ArrayList<Fragment> fragments = null; ArrayList<FragmentManagerNonConfig> childFragments = null; if (mActive != null) { for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.valueAt(i); if (f != null) { if (f.mRetainInstance) { if (fragments == null) { fragments = new ArrayList<>(); } fragments.add(f); f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); } FragmentManagerNonConfig child; if (f.mChildFragmentManager != null) { f.mChildFragmentManager.saveNonConfig(); child = f.mChildFragmentManager.mSavedNonConfig; } else { // f.mChildNonConfig may be not null, when the parent fragment is // in the backstack. child = f.mChildNonConfig; } if (childFragments == null && child != null) { childFragments = new ArrayList<>(mActive.size()); for (int j = 0; j < i; j++) { childFragments.add(null); } } if (childFragments != null) { childFragments.add(child); } } } } if (fragments == null && childFragments == null) { mSavedNonConfig = null; } else { mSavedNonConfig = new FragmentManagerNonConfig(fragments, childFragments); } } void saveFragmentViewState(Fragment f) { if (f.mView == null) { return; } if (mStateArray == null) { mStateArray = new SparseArray<Parcelable>(); } else { mStateArray.clear(); } f.mView.saveHierarchyState(mStateArray); if (mStateArray.size() > 0) { f.mSavedViewState = mStateArray; mStateArray = null; } } Bundle saveFragmentBasicState(Fragment f) { Bundle result = null; if (mStateBundle == null) { mStateBundle = new Bundle(); } f.performSaveInstanceState(mStateBundle); dispatchOnFragmentSaveInstanceState(f, mStateBundle, false); if (!mStateBundle.isEmpty()) { result = mStateBundle; mStateBundle = null; } if (f.mView != null) { saveFragmentViewState(f); } if (f.mSavedViewState != null) { if (result == null) { result = new Bundle(); } result.putSparseParcelableArray(FragmentManagerImpl.VIEW_STATE_TAG, f.mSavedViewState); } if (!f.mUserVisibleHint) { if (result == null) { result = new Bundle(); } // Only add this if it's not the default value result.putBoolean(FragmentManagerImpl.USER_VISIBLE_HINT_TAG, f.mUserVisibleHint); } return result; } Parcelable saveAllState() { // Make sure all pending operations have now been executed to get // our state update-to-date. forcePostponedTransactions(); endAnimatingAwayFragments(); execPendingActions(); mStateSaved = true; mSavedNonConfig = null; if (mActive == null || mActive.size() <= 0) { return null; } // First collect all active fragments. int N = mActive.size(); FragmentState[] active = new FragmentState[N]; boolean haveFragments = false; for (int i = 0; i < N; i++) { Fragment f = mActive.valueAt(i); if (f != null) { if (f.mIndex < 0) { throwException(new IllegalStateException( "Failure saving state: active " + f + " has cleared index: " + f.mIndex)); } haveFragments = true; FragmentState fs = new FragmentState(f); active[i] = fs; if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) { fs.mSavedFragmentState = saveFragmentBasicState(f); if (f.mTarget != null) { if (f.mTarget.mIndex < 0) { throwException(new IllegalStateException("Failure saving state: " + f + " has target not in fragment manager: " + f.mTarget)); } if (fs.mSavedFragmentState == null) { fs.mSavedFragmentState = new Bundle(); } putFragment(fs.mSavedFragmentState, FragmentManagerImpl.TARGET_STATE_TAG, f.mTarget); if (f.mTargetRequestCode != 0) { fs.mSavedFragmentState.putInt(FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, f.mTargetRequestCode); } } } else { fs.mSavedFragmentState = f.mSavedFragmentState; } if (DEBUG) Log.v(TAG, "Saved state of " + f + ": " + fs.mSavedFragmentState); } } if (!haveFragments) { if (DEBUG) Log.v(TAG, "saveAllState: no fragments!"); return null; } int[] added = null; BackStackState[] backStack = null; // Build list of currently added fragments. N = mAdded.size(); if (N > 0) { added = new int[N]; for (int i = 0; i < N; i++) { added[i] = mAdded.get(i).mIndex; if (added[i] < 0) { throwException(new IllegalStateException( "Failure saving state: active " + mAdded.get(i) + " has cleared index: " + added[i])); } if (DEBUG) Log.v(TAG, "saveAllState: adding fragment #" + i + ": " + mAdded.get(i)); } } // Now save back stack. if (mBackStack != null) { N = mBackStack.size(); if (N > 0) { backStack = new BackStackState[N]; for (int i = 0; i < N; i++) { backStack[i] = new BackStackState(this, mBackStack.get(i)); if (DEBUG) Log.v(TAG, "saveAllState: adding back stack #" + i + ": " + mBackStack.get(i)); } } } FragmentManagerState fms = new FragmentManagerState(); fms.mActive = active; fms.mAdded = added; fms.mBackStack = backStack; fms.mNextFragmentIndex = mNextFragmentIndex; if (mPrimaryNav != null) { fms.mPrimaryNavActiveIndex = mPrimaryNav.mIndex; } saveNonConfig(); return fms; } void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) { // If there is no saved state at all, then there can not be // any nonConfig fragments either, so that is that. if (state == null) return; FragmentManagerState fms = (FragmentManagerState) state; if (fms.mActive == null) return; List<FragmentManagerNonConfig> childNonConfigs = null; // First re-attach any non-config instances we are retaining back // to their saved state, so we don't try to instantiate them again. if (nonConfig != null) { List<Fragment> nonConfigFragments = nonConfig.getFragments(); childNonConfigs = nonConfig.getChildNonConfigs(); final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; for (int i = 0; i < count; i++) { Fragment f = nonConfigFragments.get(i); if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); int index = 0; // index of f in fms.mActive while (index < fms.mActive.length && fms.mActive[index].mIndex != f.mIndex) { index++; } if (index == fms.mActive.length) { throwException(new IllegalStateException( "Could not find active fragment " + "with index " + f.mIndex)); } FragmentState fs = fms.mActive[index]; fs.mInstance = f; f.mSavedViewState = null; f.mBackStackNesting = 0; f.mInLayout = false; f.mAdded = false; f.mTarget = null; if (fs.mSavedFragmentState != null) { fs.mSavedFragmentState.setClassLoader(mHost.getContext().getClassLoader()); f.mSavedViewState = fs.mSavedFragmentState .getSparseParcelableArray(FragmentManagerImpl.VIEW_STATE_TAG); f.mSavedFragmentState = fs.mSavedFragmentState; } } } // Build the full list of active fragments, instantiating them from // their saved state. mActive = new SparseArray<>(fms.mActive.length); for (int i = 0; i < fms.mActive.length; i++) { FragmentState fs = fms.mActive[i]; if (fs != null) { FragmentManagerNonConfig childNonConfig = null; if (childNonConfigs != null && i < childNonConfigs.size()) { childNonConfig = childNonConfigs.get(i); } Fragment f = fs.instantiate(mHost, mContainer, mParent, childNonConfig); if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); mActive.put(f.mIndex, f); // Now that the fragment is instantiated (or came from being // retained above), clear mInstance in case we end up re-restoring // from this FragmentState again. fs.mInstance = null; } } // Update the target of all retained fragments. if (nonConfig != null) { List<Fragment> nonConfigFragments = nonConfig.getFragments(); final int count = nonConfigFragments != null ? nonConfigFragments.size() : 0; for (int i = 0; i < count; i++) { Fragment f = nonConfigFragments.get(i); if (f.mTargetIndex >= 0) { f.mTarget = mActive.get(f.mTargetIndex); if (f.mTarget == null) { Log.w(TAG, "Re-attaching retained fragment " + f + " target no longer exists: " + f.mTargetIndex); f.mTarget = null; } } } } // Build the list of currently added fragments. mAdded.clear(); if (fms.mAdded != null) { for (int i = 0; i < fms.mAdded.length; i++) { Fragment f = mActive.get(fms.mAdded[i]); if (f == null) { throwException( new IllegalStateException("No instantiated fragment for index #" + fms.mAdded[i])); } f.mAdded = true; if (DEBUG) Log.v(TAG, "restoreAllState: added #" + i + ": " + f); if (mAdded.contains(f)) { throw new IllegalStateException("Already added!"); } synchronized (mAdded) { mAdded.add(f); } } } // Build the back stack. if (fms.mBackStack != null) { mBackStack = new ArrayList<BackStackRecord>(fms.mBackStack.length); for (int i = 0; i < fms.mBackStack.length; i++) { BackStackRecord bse = fms.mBackStack[i].instantiate(this); if (DEBUG) { Log.v(TAG, "restoreAllState: back stack #" + i + " (index " + bse.mIndex + "): " + bse); LogWriter logw = new LogWriter(Log.VERBOSE, TAG); PrintWriter pw = new FastPrintWriter(logw, false, 1024); bse.dump(" ", pw, false); pw.flush(); } mBackStack.add(bse); if (bse.mIndex >= 0) { setBackStackIndex(bse.mIndex, bse); } } } else { mBackStack = null; } if (fms.mPrimaryNavActiveIndex >= 0) { mPrimaryNav = mActive.get(fms.mPrimaryNavActiveIndex); } mNextFragmentIndex = fms.mNextFragmentIndex; } /** * To prevent list modification errors, mActive sets values to null instead of * removing them when the Fragment becomes inactive. This cleans up the list at the * end of executing the transactions. */ private void burpActive() { if (mActive != null) { for (int i = mActive.size() - 1; i >= 0; i--) { if (mActive.valueAt(i) == null) { mActive.delete(mActive.keyAt(i)); } } } } public void attachController(FragmentHostCallback<?> host, FragmentContainer container, Fragment parent) { if (mHost != null) throw new IllegalStateException("Already attached"); mHost = host; mContainer = container; mParent = parent; mAllowOldReentrantBehavior = getTargetSdk() <= Build.VERSION_CODES.N_MR1; } /** * @return the target SDK of the FragmentManager's application info. If the * FragmentManager has been torn down, then 0 is returned. */ int getTargetSdk() { if (mHost != null) { Context context = mHost.getContext(); if (context != null) { ApplicationInfo info = context.getApplicationInfo(); if (info != null) { return info.targetSdkVersion; } } } return 0; } @UnsupportedAppUsage public void noteStateNotSaved() { mSavedNonConfig = null; mStateSaved = false; final int addedCount = mAdded.size(); for (int i = 0; i < addedCount; i++) { Fragment fragment = mAdded.get(i); if (fragment != null) { fragment.noteStateNotSaved(); } } } public void dispatchCreate() { mStateSaved = false; dispatchMoveToState(Fragment.CREATED); } public void dispatchActivityCreated() { mStateSaved = false; dispatchMoveToState(Fragment.ACTIVITY_CREATED); } public void dispatchStart() { mStateSaved = false; dispatchMoveToState(Fragment.STARTED); } public void dispatchResume() { mStateSaved = false; dispatchMoveToState(Fragment.RESUMED); } public void dispatchPause() { dispatchMoveToState(Fragment.STARTED); } public void dispatchStop() { dispatchMoveToState(Fragment.STOPPED); } public void dispatchDestroyView() { dispatchMoveToState(Fragment.CREATED); } public void dispatchDestroy() { mDestroyed = true; execPendingActions(); dispatchMoveToState(Fragment.INITIALIZING); mHost = null; mContainer = null; mParent = null; } /** * This method is called by dispatch* methods to change the FragmentManager's state. * It calls moveToState directly if the target SDK is older than O. Otherwise, it sets and * clears mExecutingActions to ensure that there is no reentrancy while the * FragmentManager is changing state. * * @param state The new state of the FragmentManager. */ private void dispatchMoveToState(int state) { if (mAllowOldReentrantBehavior) { moveToState(state, false); } else { try { mExecutingActions = true; moveToState(state, false); } finally { mExecutingActions = false; } } execPendingActions(); } /** * @deprecated use {@link #dispatchMultiWindowModeChanged(boolean, Configuration)} */ @Deprecated public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode) { for (int i = mAdded.size() - 1; i >= 0; --i) { final Fragment f = mAdded.get(i); if (f != null) { f.performMultiWindowModeChanged(isInMultiWindowMode); } } } public void dispatchMultiWindowModeChanged(boolean isInMultiWindowMode, Configuration newConfig) { for (int i = mAdded.size() - 1; i >= 0; --i) { final Fragment f = mAdded.get(i); if (f != null) { f.performMultiWindowModeChanged(isInMultiWindowMode, newConfig); } } } /** * @deprecated use {@link #dispatchPictureInPictureModeChanged(boolean, Configuration)} */ @Deprecated public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode) { for (int i = mAdded.size() - 1; i >= 0; --i) { final Fragment f = mAdded.get(i); if (f != null) { f.performPictureInPictureModeChanged(isInPictureInPictureMode); } } } public void dispatchPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) { for (int i = mAdded.size() - 1; i >= 0; --i) { final Fragment f = mAdded.get(i); if (f != null) { f.performPictureInPictureModeChanged(isInPictureInPictureMode, newConfig); } } } public void dispatchConfigurationChanged(Configuration newConfig) { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performConfigurationChanged(newConfig); } } } public void dispatchLowMemory() { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performLowMemory(); } } } public void dispatchTrimMemory(int level) { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performTrimMemory(level); } } } public boolean dispatchCreateOptionsMenu(Menu menu, MenuInflater inflater) { if (mCurState < Fragment.CREATED) { return false; } boolean show = false; ArrayList<Fragment> newMenus = null; for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { if (f.performCreateOptionsMenu(menu, inflater)) { show = true; if (newMenus == null) { newMenus = new ArrayList<Fragment>(); } newMenus.add(f); } } } if (mCreatedMenus != null) { for (int i = 0; i < mCreatedMenus.size(); i++) { Fragment f = mCreatedMenus.get(i); if (newMenus == null || !newMenus.contains(f)) { f.onDestroyOptionsMenu(); } } } mCreatedMenus = newMenus; return show; } public boolean dispatchPrepareOptionsMenu(Menu menu) { if (mCurState < Fragment.CREATED) { return false; } boolean show = false; for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { if (f.performPrepareOptionsMenu(menu)) { show = true; } } } return show; } public boolean dispatchOptionsItemSelected(MenuItem item) { if (mCurState < Fragment.CREATED) { return false; } for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { if (f.performOptionsItemSelected(item)) { return true; } } } return false; } public boolean dispatchContextItemSelected(MenuItem item) { if (mCurState < Fragment.CREATED) { return false; } for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { if (f.performContextItemSelected(item)) { return true; } } } return false; } public void dispatchOptionsMenuClosed(Menu menu) { if (mCurState < Fragment.CREATED) { return; } for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performOptionsMenuClosed(menu); } } } @SuppressWarnings("ReferenceEquality") public void setPrimaryNavigationFragment(Fragment f) { if (f != null && (mActive.get(f.mIndex) != f || (f.mHost != null && f.getFragmentManager() != this))) { throw new IllegalArgumentException( "Fragment " + f + " is not an active fragment of FragmentManager " + this); } mPrimaryNav = f; } public Fragment getPrimaryNavigationFragment() { return mPrimaryNav; } public void registerFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb, boolean recursive) { mLifecycleCallbacks.add(new Pair<>(cb, recursive)); } public void unregisterFragmentLifecycleCallbacks(FragmentLifecycleCallbacks cb) { synchronized (mLifecycleCallbacks) { for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) { if (mLifecycleCallbacks.get(i).first == cb) { mLifecycleCallbacks.remove(i); break; } } } } void dispatchOnFragmentPreAttached(Fragment f, Context context, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentPreAttached(f, context, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentPreAttached(this, f, context); } } } void dispatchOnFragmentAttached(Fragment f, Context context, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentAttached(f, context, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentAttached(this, f, context); } } } void dispatchOnFragmentPreCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentPreCreated(f, savedInstanceState, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentPreCreated(this, f, savedInstanceState); } } } void dispatchOnFragmentCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentCreated(f, savedInstanceState, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentCreated(this, f, savedInstanceState); } } } void dispatchOnFragmentActivityCreated(Fragment f, Bundle savedInstanceState, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentActivityCreated(f, savedInstanceState, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentActivityCreated(this, f, savedInstanceState); } } } void dispatchOnFragmentViewCreated(Fragment f, View v, Bundle savedInstanceState, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentViewCreated(f, v, savedInstanceState, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentViewCreated(this, f, v, savedInstanceState); } } } void dispatchOnFragmentStarted(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentStarted(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentStarted(this, f); } } } void dispatchOnFragmentResumed(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentResumed(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentResumed(this, f); } } } void dispatchOnFragmentPaused(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentPaused(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentPaused(this, f); } } } void dispatchOnFragmentStopped(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentStopped(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentStopped(this, f); } } } void dispatchOnFragmentSaveInstanceState(Fragment f, Bundle outState, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentSaveInstanceState(f, outState, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentSaveInstanceState(this, f, outState); } } } void dispatchOnFragmentViewDestroyed(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentViewDestroyed(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentViewDestroyed(this, f); } } } void dispatchOnFragmentDestroyed(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentDestroyed(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentDestroyed(this, f); } } } void dispatchOnFragmentDetached(Fragment f, boolean onlyRecursive) { if (mParent != null) { FragmentManager parentManager = mParent.getFragmentManager(); if (parentManager instanceof FragmentManagerImpl) { ((FragmentManagerImpl) parentManager).dispatchOnFragmentDetached(f, true); } } for (Pair<FragmentLifecycleCallbacks, Boolean> p : mLifecycleCallbacks) { if (!onlyRecursive || p.second) { p.first.onFragmentDetached(this, f); } } } @Override public void invalidateOptionsMenu() { if (mHost != null && mCurState == Fragment.RESUMED) { mHost.onInvalidateOptionsMenu(); } else { mNeedMenuInvalidate = true; } } public static int reverseTransit(int transit) { int rev = 0; switch (transit) { case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: rev = FragmentTransaction.TRANSIT_FRAGMENT_CLOSE; break; case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: rev = FragmentTransaction.TRANSIT_FRAGMENT_OPEN; break; case FragmentTransaction.TRANSIT_FRAGMENT_FADE: rev = FragmentTransaction.TRANSIT_FRAGMENT_FADE; break; } return rev; } public static int transitToStyleIndex(int transit, boolean enter) { int animAttr = -1; switch (transit) { case FragmentTransaction.TRANSIT_FRAGMENT_OPEN: animAttr = enter ? com.android.internal.R.styleable.FragmentAnimation_fragmentOpenEnterAnimation : com.android.internal.R.styleable.FragmentAnimation_fragmentOpenExitAnimation; break; case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE: animAttr = enter ? com.android.internal.R.styleable.FragmentAnimation_fragmentCloseEnterAnimation : com.android.internal.R.styleable.FragmentAnimation_fragmentCloseExitAnimation; break; case FragmentTransaction.TRANSIT_FRAGMENT_FADE: animAttr = enter ? com.android.internal.R.styleable.FragmentAnimation_fragmentFadeEnterAnimation : com.android.internal.R.styleable.FragmentAnimation_fragmentFadeExitAnimation; break; } return animAttr; } @Override public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { if (!"fragment".equals(name)) { return null; } String fname = attrs.getAttributeValue(null, "class"); TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.Fragment); if (fname == null) { fname = a.getString(com.android.internal.R.styleable.Fragment_name); } int id = a.getResourceId(com.android.internal.R.styleable.Fragment_id, View.NO_ID); String tag = a.getString(com.android.internal.R.styleable.Fragment_tag); a.recycle(); int containerId = parent != null ? parent.getId() : 0; if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { throw new IllegalArgumentException(attrs.getPositionDescription() + ": Must specify unique android:id, android:tag, or have a parent with" + " an id for " + fname); } // If we restored from a previous state, we may already have // instantiated this fragment from the state and should use // that instance instead of making a new one. Fragment fragment = id != View.NO_ID ? findFragmentById(id) : null; if (fragment == null && tag != null) { fragment = findFragmentByTag(tag); } if (fragment == null && containerId != View.NO_ID) { fragment = findFragmentById(containerId); } if (FragmentManagerImpl.DEBUG) Log.v(TAG, "onCreateView: id=0x" + Integer.toHexString(id) + " fname=" + fname + " existing=" + fragment); if (fragment == null) { fragment = mContainer.instantiate(context, fname, null); fragment.mFromLayout = true; fragment.mFragmentId = id != 0 ? id : containerId; fragment.mContainerId = containerId; fragment.mTag = tag; fragment.mInLayout = true; fragment.mFragmentManager = this; fragment.mHost = mHost; fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); addFragment(fragment, true); } else if (fragment.mInLayout) { // A fragment already exists and it is not one we restored from // previous state. throw new IllegalArgumentException(attrs.getPositionDescription() + ": Duplicate id 0x" + Integer.toHexString(id) + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) + " with another fragment for " + fname); } else { // This fragment was retained from a previous instance; get it // going now. fragment.mInLayout = true; fragment.mHost = mHost; // If this fragment is newly instantiated (either right now, or // from last saved state), then give it the attributes to // initialize itself. if (!fragment.mRetaining) { fragment.onInflate(mHost.getContext(), attrs, fragment.mSavedFragmentState); } } // If we haven't finished entering the CREATED state ourselves yet, // push the inflated child fragment along. This will ensureInflatedFragmentView // at the right phase of the lifecycle so that we will have mView populated // for compliant fragments below. if (mCurState < Fragment.CREATED && fragment.mFromLayout) { moveToState(fragment, Fragment.CREATED, 0, 0, false); } else { moveToState(fragment); } if (fragment.mView == null) { throw new IllegalStateException("Fragment " + fname + " did not create a view."); } if (id != 0) { fragment.mView.setId(id); } if (fragment.mView.getTag() == null) { fragment.mView.setTag(tag); } return fragment.mView; } @Override public View onCreateView(String name, Context context, AttributeSet attrs) { return null; } LayoutInflater.Factory2 getLayoutInflaterFactory() { return this; } /** * An add or pop transaction to be scheduled for the UI thread. */ interface OpGenerator { /** * Generate transactions to add to {@code records} and whether or not the transaction is * an add or pop to {@code isRecordPop}. * * records and isRecordPop must be added equally so that each transaction in records * matches the boolean for whether or not it is a pop in isRecordPop. * * @param records A list to add transactions to. * @param isRecordPop A list to add whether or not the transactions added to records is * a pop transaction. * @return true if something was added or false otherwise. */ boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop); } /** * A pop operation OpGenerator. This will be run on the UI thread and will generate the * transactions that will be popped if anything can be popped. */ private class PopBackStackState implements OpGenerator { final String mName; final int mId; final int mFlags; public PopBackStackState(String name, int id, int flags) { mName = name; mId = id; mFlags = flags; } @Override public boolean generateOps(ArrayList<BackStackRecord> records, ArrayList<Boolean> isRecordPop) { if (mPrimaryNav != null // We have a primary nav fragment && mId < 0 // No valid id (since they're local) && mName == null) { // no name to pop to (since they're local) final FragmentManager childManager = mPrimaryNav.mChildFragmentManager; if (childManager != null && childManager.popBackStackImmediate()) { // We didn't add any operations for this FragmentManager even though // a child did do work. return false; } } return popBackStackState(records, isRecordPop, mName, mId, mFlags); } } /** * A listener for a postponed transaction. This waits until * {@link Fragment#startPostponedEnterTransition()} is called or a transaction is started * that interacts with this one, based on interactions with the fragment container. */ static class StartEnterTransitionListener implements Fragment.OnStartEnterTransitionListener { private final boolean mIsBack; private final BackStackRecord mRecord; private int mNumPostponed; public StartEnterTransitionListener(BackStackRecord record, boolean isBack) { mIsBack = isBack; mRecord = record; } /** * Called from {@link Fragment#startPostponedEnterTransition()}, this decreases the * number of Fragments that are postponed. This may cause the transaction to schedule * to finish running and run transitions and animations. */ @Override public void onStartEnterTransition() { mNumPostponed--; if (mNumPostponed != 0) { return; } mRecord.mManager.scheduleCommit(); } /** * Called from {@link Fragment# * setOnStartEnterTransitionListener(Fragment.OnStartEnterTransitionListener)}, this * increases the number of fragments that are postponed as part of this transaction. */ @Override public void startListening() { mNumPostponed++; } /** * @return true if there are no more postponed fragments as part of the transaction. */ public boolean isReady() { return mNumPostponed == 0; } /** * Completes the transaction and start the animations and transitions. This may skip * the transitions if this is called before all fragments have called * {@link Fragment#startPostponedEnterTransition()}. */ public void completeTransaction() { final boolean canceled; canceled = mNumPostponed > 0; FragmentManagerImpl manager = mRecord.mManager; final int numAdded = manager.mAdded.size(); for (int i = 0; i < numAdded; i++) { final Fragment fragment = manager.mAdded.get(i); fragment.setOnStartEnterTransitionListener(null); if (canceled && fragment.isPostponed()) { fragment.startPostponedEnterTransition(); } } mRecord.mManager.completeExecute(mRecord, mIsBack, !canceled, true); } /** * Cancels this transaction instead of completing it. That means that the state isn't * changed, so the pop results in no change to the state. */ public void cancelTransaction() { mRecord.mManager.completeExecute(mRecord, mIsBack, false, false); } } }