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.content.Context; import android.content.res.Configuration; import android.content.res.TypedArray; import android.os.Bundle; import android.os.Debug; import android.os.Handler; import android.os.Looper; import android.os.Parcel; import android.os.Parcelable; import android.util.AttributeSet; import android.util.DebugUtils; import android.util.Log; import android.util.LogWriter; 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; /** * 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/topics/fundamentals/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. */ 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.getBackStackEntry()}. * * <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. */ 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. */ 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. * * @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. * @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. * @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. * @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; * entries start index 0 being the bottom of the stack. */ 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); /** * 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(); /** * 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() { } } final class FragmentManagerState implements Parcelable { FragmentState[] mActive; int[] mAdded; BackStackState[] mBackStack; public FragmentManagerState() { } public FragmentManagerState(Parcel in) { mActive = in.createTypedArray(FragmentState.CREATOR); mAdded = in.createIntArray(); mBackStack = in.createTypedArray(BackStackState.CREATOR); } public int describeContents() { return 0; } public void writeToParcel(Parcel dest, int flags) { dest.writeTypedArray(mActive, flags); dest.writeIntArray(mAdded); dest.writeTypedArray(mBackStack, flags); } 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]; } }; } /** * Callbacks from FragmentManagerImpl to its container. */ interface FragmentContainer { public View findViewById(int id); public boolean hasView(); } /** * 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"; ArrayList<Runnable> mPendingActions; Runnable[] mTmpActions; boolean mExecutingActions; ArrayList<Fragment> mActive; ArrayList<Fragment> mAdded; ArrayList<Integer> mAvailIndices; ArrayList<BackStackRecord> mBackStack; ArrayList<Fragment> mCreatedMenus; // Must be accessed while locked. ArrayList<BackStackRecord> mBackStackIndices; ArrayList<Integer> mAvailBackStackIndices; ArrayList<OnBackStackChangedListener> mBackStackChangeListeners; int mCurState = Fragment.INITIALIZING; Activity mActivity; FragmentContainer mContainer; Fragment mParent; boolean mNeedMenuInvalidate; boolean mStateSaved; boolean mDestroyed; String mNoTransactionsBecause; boolean mHavePendingDeferredStart; // Temporary vars for state save and restore. Bundle mStateBundle = null; SparseArray<Parcelable> mStateArray = null; 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 (mActivity != null) { Log.e(TAG, "Activity state:"); try { mActivity.dump(" ", 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; } @Override public FragmentTransaction beginTransaction() { return new BackStackRecord(this); } @Override public boolean executePendingTransactions() { return execPendingActions(); } @Override public void popBackStack() { enqueueAction(new Runnable() { @Override public void run() { popBackStackState(mActivity.mHandler, null, -1, 0); } }, false); } @Override public boolean popBackStackImmediate() { checkStateLoss(); executePendingTransactions(); return popBackStackState(mActivity.mHandler, null, -1, 0); } @Override public void popBackStack(final String name, final int flags) { enqueueAction(new Runnable() { @Override public void run() { popBackStackState(mActivity.mHandler, name, -1, flags); } }, false); } @Override public boolean popBackStackImmediate(String name, int flags) { checkStateLoss(); executePendingTransactions(); return popBackStackState(mActivity.mHandler, name, -1, flags); } @Override public void popBackStack(final int id, final int flags) { if (id < 0) { throw new IllegalArgumentException("Bad id: " + id); } enqueueAction(new Runnable() { @Override public void run() { popBackStackState(mActivity.mHandler, null, id, flags); } }, false); } @Override public boolean popBackStackImmediate(int id, int flags) { checkStateLoss(); executePendingTransactions(); if (id < 0) { throw new IllegalArgumentException("Bad id: " + id); } return popBackStackState(mActivity.mHandler, null, id, flags); } @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; } if (index >= mActive.size()) { throwException( new IllegalStateException("Fragment no longer exists for key " + key + ": index " + index)); } Fragment f = mActive.get(index); if (f == null) { throwException( new IllegalStateException("Fragment no longer exists for key " + key + ": index " + index)); } return f; } @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(mActivity, 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.get(i); writer.print(prefix); writer.print(" #"); writer.print(i); writer.print(": "); writer.println(f); if (f != null) { f.dump(innerPrefix, fd, writer, args); } } } } if (mAdded != null) { 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++) { Runnable 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(" mActivity="); writer.println(mActivity); 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); } if (mAvailIndices != null && mAvailIndices.size() > 0) { writer.print(prefix); writer.print(" mAvailIndices: "); writer.println(Arrays.toString(mAvailIndices.toArray())); } } Animator loadAnimator(Fragment fragment, int transit, boolean enter, int transitionStyle) { Animator animObj = fragment.onCreateAnimator(transit, enter, fragment.mNextAnim); if (animObj != null) { return animObj; } if (fragment.mNextAnim != 0) { Animator anim = AnimatorInflater.loadAnimator(mActivity, fragment.mNextAnim); if (anim != null) { return anim; } } if (transit == 0) { return null; } int styleIndex = transitToStyleIndex(transit, enter); if (styleIndex < 0) { return null; } if (transitionStyle == 0 && mActivity.getWindow() != null) { transitionStyle = mActivity.getWindow().getAttributes().windowAnimations; } if (transitionStyle == 0) { return null; } TypedArray attrs = mActivity.obtainStyledAttributes(transitionStyle, com.android.internal.R.styleable.FragmentAnimation); int anim = attrs.getResourceId(styleIndex, 0); attrs.recycle(); if (anim == 0) { return null; } return AnimatorInflater.loadAnimator(mActivity, 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); } } 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) { // 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.mAnimatingAway != 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.mAnimatingAway = null; moveToState(f, f.mStateAfterAnimating, 0, 0, true); } switch (f.mState) { case 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.mActivity = mActivity; f.mParentFragment = mParent; f.mFragmentManager = mParent != null ? mParent.mChildFragmentManager : mActivity.mFragments; f.mCalled = false; f.onAttach(mActivity); if (!f.mCalled) { throw new SuperNotCalledException( "Fragment " + f + " did not call through to super.onAttach()"); } if (f.mParentFragment == null) { mActivity.onAttachFragment(f); } if (!f.mRetaining) { f.performCreate(f.mSavedFragmentState); } f.mRetaining = false; if (f.mFromLayout) { // For fragments that are part of the content view // layout, we need to instantiate the view immediately // and the inflater will take care of adding it. f.mView = f.performCreateView(f.getLayoutInflater(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); } } case Fragment.CREATED: if (newState > Fragment.CREATED) { if (DEBUG) Log.v(TAG, "moveto ACTIVITY_CREATED: " + f); if (!f.mFromLayout) { ViewGroup container = null; if (f.mContainerId != 0) { container = (ViewGroup) mContainer.findViewById(f.mContainerId); if (container == null && !f.mRestored) { throwException(new IllegalArgumentException( "No view found for id 0x" + Integer.toHexString(f.mContainerId) + " (" + f.getResources().getResourceName(f.mContainerId) + ") for fragment " + f)); } } f.mContainer = container; f.mView = f.performCreateView(f.getLayoutInflater(f.mSavedFragmentState), container, f.mSavedFragmentState); if (f.mView != null) { f.mView.setSaveFromParentEnabled(false); if (container != null) { Animator anim = loadAnimator(f, transit, true, transitionStyle); if (anim != null) { anim.setTarget(f.mView); anim.start(); } container.addView(f.mView); } if (f.mHidden) f.mView.setVisibility(View.GONE); f.onViewCreated(f.mView, f.mSavedFragmentState); } } f.performActivityCreated(f.mSavedFragmentState); if (f.mView != null) { f.restoreViewState(f.mSavedFragmentState); } f.mSavedFragmentState = null; } case Fragment.ACTIVITY_CREATED: case Fragment.STOPPED: if (newState > Fragment.STOPPED) { if (DEBUG) Log.v(TAG, "moveto STARTED: " + f); f.performStart(); } case Fragment.STARTED: if (newState > Fragment.STARTED) { if (DEBUG) Log.v(TAG, "moveto RESUMED: " + f); f.mResumed = true; f.performResume(); // 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(); f.mResumed = false; } case Fragment.STARTED: if (newState < Fragment.STARTED) { if (DEBUG) Log.v(TAG, "movefrom STARTED: " + f); f.performStop(); } 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 (!mActivity.isFinishing() && f.mSavedViewState == null) { saveFragmentViewState(f); } } f.performDestroyView(); if (f.mView != null && f.mContainer != null) { Animator anim = null; if (mCurState > Fragment.INITIALIZING && !mDestroyed) { anim = loadAnimator(f, transit, false, transitionStyle); } if (anim != null) { final ViewGroup container = f.mContainer; final View view = f.mView; final Fragment fragment = f; container.startViewTransition(view); f.mAnimatingAway = anim; f.mStateAfterAnimating = newState; anim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator anim) { container.endViewTransition(view); if (fragment.mAnimatingAway != null) { fragment.mAnimatingAway = null; moveToState(fragment, fragment.mStateAfterAnimating, 0, 0, false); } } }); anim.setTarget(f.mView); anim.start(); } f.mContainer.removeView(f.mView); } f.mContainer = null; f.mView = null; } case Fragment.CREATED: if (newState < Fragment.CREATED) { if (mDestroyed) { if (f.mAnimatingAway != 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.mAnimatingAway; f.mAnimatingAway = null; anim.cancel(); } } if (f.mAnimatingAway != 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.mStateAfterAnimating = newState; newState = Fragment.CREATED; } else { if (DEBUG) Log.v(TAG, "movefrom CREATED: " + f); if (!f.mRetaining) { f.performDestroy(); } f.mCalled = false; f.onDetach(); if (!f.mCalled) { throw new SuperNotCalledException( "Fragment " + f + " did not call through to super.onDetach()"); } if (!keepActive) { if (!f.mRetaining) { makeInactive(f); } else { f.mActivity = null; f.mParentFragment = null; f.mFragmentManager = null; f.mChildFragmentManager = null; } } } } } } f.mState = newState; } void moveToState(Fragment f) { moveToState(f, mCurState, 0, 0, false); } void moveToState(int newState, boolean always) { moveToState(newState, 0, 0, always); } void moveToState(int newState, int transit, int transitStyle, boolean always) { if (mActivity == null && newState != Fragment.INITIALIZING) { throw new IllegalStateException("No activity"); } if (!always && mCurState == newState) { return; } mCurState = newState; if (mActive != null) { boolean loadersRunning = false; for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.get(i); if (f != null) { moveToState(f, newState, transit, transitStyle, false); if (f.mLoaderManager != null) { loadersRunning |= f.mLoaderManager.hasRunningLoaders(); } } } if (!loadersRunning) { startPendingDeferredFragments(); } if (mNeedMenuInvalidate && mActivity != null && mCurState == Fragment.RESUMED) { mActivity.invalidateOptionsMenu(); mNeedMenuInvalidate = false; } } } void startPendingDeferredFragments() { if (mActive == null) return; for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.get(i); if (f != null) { performPendingDeferredStart(f); } } } void makeActive(Fragment f) { if (f.mIndex >= 0) { return; } if (mAvailIndices == null || mAvailIndices.size() <= 0) { if (mActive == null) { mActive = new ArrayList<Fragment>(); } f.setIndex(mActive.size(), mParent); mActive.add(f); } else { f.setIndex(mAvailIndices.remove(mAvailIndices.size() - 1), mParent); mActive.set(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); mActive.set(f.mIndex, null); if (mAvailIndices == null) { mAvailIndices = new ArrayList<Integer>(); } mAvailIndices.add(f.mIndex); mActivity.invalidateFragment(f.mWho); f.initState(); } public void addFragment(Fragment fragment, boolean moveToStateNow) { if (mAdded == null) { mAdded = new ArrayList<Fragment>(); } if (DEBUG) Log.v(TAG, "add: " + fragment); makeActive(fragment); if (!fragment.mDetached) { if (mAdded.contains(fragment)) { throw new IllegalStateException("Fragment already added: " + fragment); } mAdded.add(fragment); fragment.mAdded = true; fragment.mRemoving = false; if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } if (moveToStateNow) { moveToState(fragment); } } } public void removeFragment(Fragment fragment, int transition, int transitionStyle) { 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); } } if (mAdded != null) { mAdded.remove(fragment); } if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.mAdded = false; fragment.mRemoving = true; moveToState(fragment, inactive ? Fragment.INITIALIZING : Fragment.CREATED, transition, transitionStyle, false); } } public void hideFragment(Fragment fragment, int transition, int transitionStyle) { if (DEBUG) Log.v(TAG, "hide: " + fragment); if (!fragment.mHidden) { fragment.mHidden = true; if (fragment.mView != null) { Animator anim = loadAnimator(fragment, transition, false, transitionStyle); if (anim != null) { anim.setTarget(fragment.mView); // Delay the actual hide operation until the animation finishes, otherwise // the fragment will just immediately disappear final Fragment finalFragment = fragment; anim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { if (finalFragment.mView != null) { finalFragment.mView.setVisibility(View.GONE); } } }); anim.start(); } else { fragment.mView.setVisibility(View.GONE); } } if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.onHiddenChanged(true); } } public void showFragment(Fragment fragment, int transition, int transitionStyle) { if (DEBUG) Log.v(TAG, "show: " + fragment); if (fragment.mHidden) { fragment.mHidden = false; if (fragment.mView != null) { Animator anim = loadAnimator(fragment, transition, true, transitionStyle); if (anim != null) { anim.setTarget(fragment.mView); anim.start(); } fragment.mView.setVisibility(View.VISIBLE); } if (fragment.mAdded && fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.onHiddenChanged(false); } } public void detachFragment(Fragment fragment, int transition, int transitionStyle) { 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 (mAdded != null) { if (DEBUG) Log.v(TAG, "remove from detach: " + fragment); mAdded.remove(fragment); } if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } fragment.mAdded = false; moveToState(fragment, Fragment.CREATED, transition, transitionStyle, false); } } } public void attachFragment(Fragment fragment, int transition, int transitionStyle) { if (DEBUG) Log.v(TAG, "attach: " + fragment); if (fragment.mDetached) { fragment.mDetached = false; if (!fragment.mAdded) { if (mAdded == null) { mAdded = new ArrayList<Fragment>(); } if (mAdded.contains(fragment)) { throw new IllegalStateException("Fragment already added: " + fragment); } if (DEBUG) Log.v(TAG, "add from attach: " + fragment); mAdded.add(fragment); fragment.mAdded = true; if (fragment.mHasMenu && fragment.mMenuVisible) { mNeedMenuInvalidate = true; } moveToState(fragment, mCurState, transition, transitionStyle, false); } } } public Fragment findFragmentById(int id) { if (mAdded != null) { // 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.get(i); if (f != null && f.mFragmentId == id) { return f; } } } return null; } public Fragment findFragmentByTag(String tag) { if (mAdded != null && 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.get(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.get(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); } } /** * 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(Runnable action, boolean allowStateLoss) { if (!allowStateLoss) { checkStateLoss(); } synchronized (this) { if (mDestroyed || mActivity == null) { throw new IllegalStateException("Activity has been destroyed"); } if (mPendingActions == null) { mPendingActions = new ArrayList<Runnable>(); } mPendingActions.add(action); if (mPendingActions.size() == 1) { mActivity.mHandler.removeCallbacks(mExecCommit); mActivity.mHandler.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); } } /** * Only call from main thread! */ public boolean execPendingActions() { if (mExecutingActions) { throw new IllegalStateException("Recursive entry to executePendingTransactions"); } if (Looper.myLooper() != mActivity.mHandler.getLooper()) { throw new IllegalStateException("Must be called from main thread of process"); } boolean didSomething = false; while (true) { int numActions; synchronized (this) { if (mPendingActions == null || mPendingActions.size() == 0) { break; } numActions = mPendingActions.size(); if (mTmpActions == null || mTmpActions.length < numActions) { mTmpActions = new Runnable[numActions]; } mPendingActions.toArray(mTmpActions); mPendingActions.clear(); mActivity.mHandler.removeCallbacks(mExecCommit); } mExecutingActions = true; for (int i = 0; i < numActions; i++) { mTmpActions[i].run(); mTmpActions[i] = null; } mExecutingActions = false; didSomething = true; } if (mHavePendingDeferredStart) { boolean loadersRunning = false; for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.get(i); if (f != null && f.mLoaderManager != null) { loadersRunning |= f.mLoaderManager.hasRunningLoaders(); } } if (!loadersRunning) { mHavePendingDeferredStart = false; startPendingDeferredFragments(); } } return didSomething; } 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); reportBackStackChanged(); } boolean popBackStackState(Handler handler, 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; } final BackStackRecord bss = mBackStack.remove(last); SparseArray<Fragment> firstOutFragments = new SparseArray<Fragment>(); SparseArray<Fragment> lastInFragments = new SparseArray<Fragment>(); bss.calculateBackFragments(firstOutFragments, lastInFragments); bss.popFromBackStack(true, null, firstOutFragments, lastInFragments); reportBackStackChanged(); } 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; } final ArrayList<BackStackRecord> states = new ArrayList<BackStackRecord>(); for (int i = mBackStack.size() - 1; i > index; i--) { states.add(mBackStack.remove(i)); } final int LAST = states.size() - 1; SparseArray<Fragment> firstOutFragments = new SparseArray<Fragment>(); SparseArray<Fragment> lastInFragments = new SparseArray<Fragment>(); for (int i = 0; i <= LAST; i++) { states.get(i).calculateBackFragments(firstOutFragments, lastInFragments); } BackStackRecord.TransitionState state = null; for (int i = 0; i <= LAST; i++) { if (DEBUG) Log.v(TAG, "Popping back stack state: " + states.get(i)); state = states.get(i).popFromBackStack(i == LAST, state, firstOutFragments, lastInFragments); } reportBackStackChanged(); } return true; } ArrayList<Fragment> retainNonConfig() { ArrayList<Fragment> fragments = null; if (mActive != null) { for (int i = 0; i < mActive.size(); i++) { Fragment f = mActive.get(i); if (f != null && f.mRetainInstance) { if (fragments == null) { fragments = new ArrayList<Fragment>(); } fragments.add(f); f.mRetaining = true; f.mTargetIndex = f.mTarget != null ? f.mTarget.mIndex : -1; if (DEBUG) Log.v(TAG, "retainNonConfig: keeping retained " + f); } } } return fragments; } 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); 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. execPendingActions(); mStateSaved = true; 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.get(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. if (mAdded != null) { 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; return fms; } void restoreAllState(Parcelable state, ArrayList<Fragment> 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; // 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) { for (int i = 0; i < nonConfig.size(); i++) { Fragment f = nonConfig.get(i); if (DEBUG) Log.v(TAG, "restoreAllState: re-attaching retained " + f); FragmentState fs = fms.mActive[f.mIndex]; 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(mActivity.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 ArrayList<Fragment>(fms.mActive.length); if (mAvailIndices != null) { mAvailIndices.clear(); } for (int i = 0; i < fms.mActive.length; i++) { FragmentState fs = fms.mActive[i]; if (fs != null) { Fragment f = fs.instantiate(mActivity, mParent); if (DEBUG) Log.v(TAG, "restoreAllState: active #" + i + ": " + f); mActive.add(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; } else { mActive.add(null); if (mAvailIndices == null) { mAvailIndices = new ArrayList<Integer>(); } if (DEBUG) Log.v(TAG, "restoreAllState: avail #" + i); mAvailIndices.add(i); } } // Update the target of all retained fragments. if (nonConfig != null) { for (int i = 0; i < nonConfig.size(); i++) { Fragment f = nonConfig.get(i); if (f.mTargetIndex >= 0) { if (f.mTargetIndex < mActive.size()) { f.mTarget = mActive.get(f.mTargetIndex); } else { Log.w(TAG, "Re-attaching retained fragment " + f + " target no longer exists: " + f.mTargetIndex); f.mTarget = null; } } } } // Build the list of currently added fragments. if (fms.mAdded != null) { mAdded = new ArrayList<Fragment>(fms.mAdded.length); 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!"); } mAdded.add(f); } } else { mAdded = null; } // 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; } } public void attachActivity(Activity activity, FragmentContainer container, Fragment parent) { if (mActivity != null) throw new IllegalStateException("Already attached"); mActivity = activity; mContainer = container; mParent = parent; } public void noteStateNotSaved() { mStateSaved = false; } public void dispatchCreate() { mStateSaved = false; moveToState(Fragment.CREATED, false); } public void dispatchActivityCreated() { mStateSaved = false; moveToState(Fragment.ACTIVITY_CREATED, false); } public void dispatchStart() { mStateSaved = false; moveToState(Fragment.STARTED, false); } public void dispatchResume() { mStateSaved = false; moveToState(Fragment.RESUMED, false); } public void dispatchPause() { moveToState(Fragment.STARTED, false); } public void dispatchStop() { moveToState(Fragment.STOPPED, false); } public void dispatchDestroyView() { moveToState(Fragment.CREATED, false); } public void dispatchDestroy() { mDestroyed = true; execPendingActions(); moveToState(Fragment.INITIALIZING, false); mActivity = null; mContainer = null; mParent = null; } public void dispatchConfigurationChanged(Configuration newConfig) { if (mAdded != null) { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performConfigurationChanged(newConfig); } } } } public void dispatchLowMemory() { if (mAdded != null) { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performLowMemory(); } } } } public void dispatchTrimMemory(int level) { if (mAdded != null) { 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) { boolean show = false; ArrayList<Fragment> newMenus = null; if (mAdded != 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) { boolean show = false; if (mAdded != null) { 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 (mAdded != null) { 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 (mAdded != null) { 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 (mAdded != null) { for (int i = 0; i < mAdded.size(); i++) { Fragment f = mAdded.get(i); if (f != null) { f.performOptionsMenuClosed(menu); } } } } @Override public void invalidateOptionsMenu() { if (mActivity != null && mCurState == Fragment.RESUMED) { mActivity.invalidateOptionsMenu(); } 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 = Fragment.instantiate(context, fname); fragment.mFromLayout = true; fragment.mFragmentId = id != 0 ? id : containerId; fragment.mContainerId = containerId; fragment.mTag = tag; fragment.mInLayout = true; fragment.mFragmentManager = this; fragment.onInflate(mActivity, 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; // 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(mActivity, attrs, fragment.mSavedFragmentState); } } // If we haven't finished entering the CREATED state ourselves yet, // push the inflated child fragment along. 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; } }