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android / platform / frameworks / support / 32a7dec0a0f39707d14341ba507b48ef2eb3f1fe / . / fragment / fragment / src / main / java / androidx / fragment / app / FragmentManagerImpl.java
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/*
* Copyright 2018 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 androidx.fragment.app;
import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.animation.AnimatorListenerAdapter;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.os.Looper;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseArray;
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 android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.ScaleAnimation;
import android.view.animation.Transformation;
import androidx.activity.OnBackPressedCallback;
import androidx.activity.OnBackPressedDispatcher;
import androidx.activity.OnBackPressedDispatcherOwner;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.collection.ArraySet;
import androidx.core.util.DebugUtils;
import androidx.core.util.LogWriter;
import androidx.core.view.OneShotPreDrawListener;
import androidx.lifecycle.Lifecycle;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.ViewModelStore;
import androidx.lifecycle.ViewModelStoreOwner;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* 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";
private static final class FragmentLifecycleCallbacksHolder {
final FragmentLifecycleCallbacks mCallback;
final boolean mRecursive;
FragmentLifecycleCallbacksHolder(FragmentLifecycleCallbacks callback, boolean recursive) {
mCallback = callback;
mRecursive = recursive;
}
}
ArrayList<OpGenerator> mPendingActions;
boolean mExecutingActions;
int mNextFragmentIndex = 0;
final ArrayList<Fragment> mAdded = new ArrayList<>();
final HashMap<String, Fragment> mActive = new HashMap<>();
ArrayList<BackStackRecord> mBackStack;
ArrayList<Fragment> mCreatedMenus;
private OnBackPressedDispatcher mOnBackPressedDispatcher;
private final OnBackPressedCallback mOnBackPressedCallback =
new OnBackPressedCallback(false) {
@Override
public void handleOnBackPressed() {
FragmentManagerImpl.this.handleOnBackPressed();
}
};
// Must be accessed while locked.
ArrayList<BackStackRecord> mBackStackIndices;
ArrayList<Integer> mAvailBackStackIndices;
ArrayList<OnBackStackChangedListener> mBackStackChangeListeners;
private final CopyOnWriteArrayList<FragmentLifecycleCallbacksHolder>
mLifecycleCallbacks = new CopyOnWriteArrayList<>();
int mCurState = Fragment.INITIALIZING;
FragmentHostCallback mHost;
FragmentContainer mContainer;
Fragment mParent;
@Nullable
Fragment mPrimaryNav;
boolean mNeedMenuInvalidate;
boolean mStateSaved;
boolean mStopped;
boolean mDestroyed;
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;
private FragmentManagerViewModel mNonConfig;
Runnable mExecCommit = new Runnable() {
@Override
public void run() {
execPendingActions();
}
};
private void throwException(RuntimeException ex) {
Log.e(TAG, ex.getMessage());
Log.e(TAG, "Activity state:");
LogWriter logw = new LogWriter(TAG);
PrintWriter pw = new PrintWriter(logw);
if (mHost != null) {
try {
mHost.onDump(" ", null, pw, new String[] { });
} catch (Exception e) {
Log.e(TAG, "Failed dumping state", e);
}
} else {
try {
dump(" ", null, pw, new String[] { });
} catch (Exception e) {
Log.e(TAG, "Failed dumping state", e);
}
}
throw ex;
}
@NonNull
@Override
public FragmentTransaction beginTransaction() {
return new BackStackRecord(this);
}
@Override
public boolean executePendingTransactions() {
boolean updates = execPendingActions();
forcePostponedTransactions();
return updates;
}
private void updateOnBackPressedCallbackEnabled() {
// Always enable the callback if we have pending actions
// as we don't know if they'll change the back stack entry count.
// See handleOnBackPressed() for more explanation
if (mPendingActions != null && !mPendingActions.isEmpty()) {
mOnBackPressedCallback.setEnabled(true);
return;
}
// This FragmentManager needs to have a back stack for this to be enabled
// And the parent fragment, if it exists, needs to be the primary navigation
// fragment.
mOnBackPressedCallback.setEnabled(getBackStackEntryCount() > 0
&& isPrimaryNavigation(mParent));
}
/**
* Recursively check up the FragmentManager hierarchy of primary
* navigation Fragments to ensure that all of the parent Fragments are the
* primary navigation Fragment for their associated FragmentManager
*/
boolean isPrimaryNavigation(@Nullable Fragment parent) {
// If the parent is null, then we're at the root host
// and we're always the primary navigation
if (parent == null) {
return true;
}
FragmentManagerImpl parentFragmentManager = parent.mFragmentManager;
Fragment primaryNavigationFragment = parentFragmentManager
.getPrimaryNavigationFragment();
// The parent Fragment needs to be the primary navigation Fragment
// and, if it has a parent itself, that parent also needs to be
// the primary navigation fragment, recursively up the stack
return parent == primaryNavigationFragment
&& isPrimaryNavigation(parentFragmentManager.mParent);
}
@SuppressWarnings("WeakerAccess") /* synthetic access */
void handleOnBackPressed() {
// First, execute any pending actions to make sure we're in an
// up to date view of the world just in case anyone is queuing
// up transactions that change the back stack then immediately
// calling onBackPressed()
execPendingActions();
if (mOnBackPressedCallback.isEnabled()) {
// We still have a back stack, so we can pop
popBackStackImmediate();
} else {
// Sigh. Due to FragmentManager's asynchronicity, we can
// get into cases where we *think* we can handle the back
// button but because of frame perfect dispatch, we fell
// on our face. Since our callback is disabled, we can
// re-trigger the onBackPressed() to dispatch to the next
// enabled callback
mOnBackPressedDispatcher.onBackPressed();
}
}
@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(@Nullable final String name, final int flags) {
enqueueAction(new PopBackStackState(name, -1, flags), false);
}
@Override
public boolean popBackStackImmediate(@Nullable String name, int flags) {
checkStateLoss();
return popBackStackImmediate(name, -1, flags);
}
@Override
public void popBackStack(final int id, final 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();
execPendingActions();
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.getChildFragmentManager();
if (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();
}
}
updateOnBackPressedCallbackEnabled();
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.mFragmentManager != this) {
throwException(new IllegalStateException("Fragment " + fragment
+ " is not currently in the FragmentManager"));
}
bundle.putString(key, fragment.mWho);
}
@Override
@Nullable
public Fragment getFragment(Bundle bundle, String key) {
String who = bundle.getString(key);
if (who == null) {
return null;
}
Fragment f = mActive.get(who);
if (f == null) {
throwException(new IllegalStateException("Fragment no longer exists for key "
+ key + ": unique id " + who));
}
return f;
}
@Override
@SuppressWarnings("unchecked")
public List<Fragment> getFragments() {
if (mAdded.isEmpty()) {
return Collections.emptyList();
}
synchronized (mAdded) {
return (List<Fragment>) mAdded.clone();
}
}
@NonNull
ViewModelStore getViewModelStore(@NonNull Fragment f) {
return mNonConfig.getViewModelStore(f);
}
@NonNull
FragmentManagerViewModel getChildNonConfig(@NonNull Fragment f) {
return mNonConfig.getChildNonConfig(f);
}
void addRetainedFragment(@NonNull Fragment f) {
if (isStateSaved()) {
if (FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Ignoring addRetainedFragment as the state is already saved");
}
return;
}
boolean added = mNonConfig.addRetainedFragment(f);
if (added && FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Updating retained Fragments: Added " + f);
}
}
void removeRetainedFragment(@NonNull Fragment f) {
if (isStateSaved()) {
if (FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Ignoring removeRetainedFragment as the state is already saved");
}
return;
}
boolean removed = mNonConfig.removeRetainedFragment(f);
if (removed && FragmentManagerImpl.DEBUG) {
Log.v(TAG, "Updating retained Fragments: Removed " + f);
}
}
/**
* This is used by FragmentController to get the Active fragments.
*
* @return A list of active fragments in the fragment manager, including those that are in the
* back stack.
*/
@NonNull
List<Fragment> getActiveFragments() {
return new ArrayList<>(mActive.values());
}
/**
* Used by FragmentController to get the number of Active Fragments.
*
* @return The number of active fragments.
*/
int getActiveFragmentCount() {
return mActive.size();
}
@Override
@Nullable
public Fragment.SavedState saveFragmentInstanceState(@NonNull Fragment fragment) {
if (fragment.mFragmentManager != this) {
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(@NonNull String prefix, @Nullable FileDescriptor fd,
@NonNull PrintWriter writer, @Nullable String[] args) {
String innerPrefix = prefix + " ";
if (!mActive.isEmpty()) {
writer.print(prefix); writer.print("Active Fragments in ");
writer.print(Integer.toHexString(System.identityHashCode(this)));
writer.println(":");
for (Fragment f : mActive.values()) {
writer.print(prefix); writer.println(f);
if (f != null) {
f.dump(innerPrefix, fd, writer, args);
}
}
}
int 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, writer);
}
}
}
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(" mStopped="); writer.print(mStopped);
writer.print(" mDestroyed="); writer.println(mDestroyed);
if (mNeedMenuInvalidate) {
writer.print(prefix); writer.print(" mNeedMenuInvalidate=");
writer.println(mNeedMenuInvalidate);
}
}
static final Interpolator DECELERATE_QUINT = new DecelerateInterpolator(2.5f);
static final Interpolator DECELERATE_CUBIC = new DecelerateInterpolator(1.5f);
static final int ANIM_DUR = 220;
static AnimationOrAnimator makeOpenCloseAnimation(float startScale,
float endScale, float startAlpha, float endAlpha) {
AnimationSet set = new AnimationSet(false);
ScaleAnimation scale = new ScaleAnimation(startScale, endScale, startScale, endScale,
Animation.RELATIVE_TO_SELF, .5f, Animation.RELATIVE_TO_SELF, .5f);
scale.setInterpolator(DECELERATE_QUINT);
scale.setDuration(ANIM_DUR);
set.addAnimation(scale);
AlphaAnimation alpha = new AlphaAnimation(startAlpha, endAlpha);
alpha.setInterpolator(DECELERATE_CUBIC);
alpha.setDuration(ANIM_DUR);
set.addAnimation(alpha);
return new AnimationOrAnimator(set);
}
static AnimationOrAnimator makeFadeAnimation(float start, float end) {
AlphaAnimation anim = new AlphaAnimation(start, end);
anim.setInterpolator(DECELERATE_CUBIC);
anim.setDuration(ANIM_DUR);
return new AnimationOrAnimator(anim);
}
AnimationOrAnimator loadAnimation(Fragment fragment, int transit, boolean enter,
int transitionStyle) {
int nextAnim = fragment.getNextAnim();
// Clear the Fragment animation
fragment.setNextAnim(0);
// If there is a transition on the container, clear those set on the fragment
if (fragment.mContainer != null && fragment.mContainer.getLayoutTransition() != null) {
return null;
}
Animation animation = fragment.onCreateAnimation(transit, enter, nextAnim);
if (animation != null) {
return new AnimationOrAnimator(animation);
}
Animator animator = fragment.onCreateAnimator(transit, enter, nextAnim);
if (animator != null) {
return new AnimationOrAnimator(animator);
}
if (nextAnim != 0) {
String dir = mHost.getContext().getResources().getResourceTypeName(nextAnim);
boolean isAnim = "anim".equals(dir);
boolean successfulLoad = false;
if (isAnim) {
// try AnimationUtils first
try {
animation = AnimationUtils.loadAnimation(mHost.getContext(), nextAnim);
if (animation != null) {
return new AnimationOrAnimator(animation);
}
// A null animation may be returned and that is acceptable
successfulLoad = true; // succeeded in loading animation, but it is null
} catch (Resources.NotFoundException e) {
throw e; // Rethrow it -- the resource should be found if it is provided.
} catch (RuntimeException e) {
// Other exceptions can occur when loading an Animator from AnimationUtils.
}
}
if (!successfulLoad) {
// try Animator
try {
animator = AnimatorInflater.loadAnimator(mHost.getContext(), nextAnim);
if (animator != null) {
return new AnimationOrAnimator(animator);
}
} catch (RuntimeException e) {
if (isAnim) {
// Rethrow it -- we already tried AnimationUtils and it failed.
throw e;
}
// Otherwise, it is probably an animation resource
animation = AnimationUtils.loadAnimation(mHost.getContext(), nextAnim);
if (animation != null) {
return new AnimationOrAnimator(animation);
}
}
}
}
if (transit == 0) {
return null;
}
int styleIndex = transitToStyleIndex(transit, enter);
if (styleIndex < 0) {
return null;
}
switch (styleIndex) {
case ANIM_STYLE_OPEN_ENTER:
return makeOpenCloseAnimation(1.125f, 1.0f, 0, 1);
case ANIM_STYLE_OPEN_EXIT:
return makeOpenCloseAnimation(1.0f, .975f, 1, 0);
case ANIM_STYLE_CLOSE_ENTER:
return makeOpenCloseAnimation(.975f, 1.0f, 0, 1);
case ANIM_STYLE_CLOSE_EXIT:
return makeOpenCloseAnimation(1.0f, 1.075f, 1, 0);
case ANIM_STYLE_FADE_ENTER:
return makeFadeAnimation(0, 1);
case ANIM_STYLE_FADE_EXIT:
return makeFadeAnimation(1, 0);
}
// TODO: remove or fix transitionStyle -- it apparently never worked.
if (transitionStyle == 0 && mHost.onHasWindowAnimations()) {
transitionStyle = mHost.onGetWindowAnimations();
}
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);
return null;
}
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) {
// 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.ACTIVITY_CREATED) {
newState = Fragment.ACTIVITY_CREATED;
}
// Don't allow the Fragment to go above its max lifecycle state
// Ensure that Fragments are capped at CREATED instead of ACTIVITY_CREATED.
if (f.mMaxState == Lifecycle.State.CREATED) {
newState = Math.min(newState, Fragment.CREATED);
} else {
newState = Math.min(newState, f.mMaxState.ordinal());
}
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 || f.getAnimator() != 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);
f.setAnimator(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.mSavedFragmentState.setClassLoader(mHost.getContext()
.getClassLoader());
f.mSavedViewState = f.mSavedFragmentState.getSparseParcelableArray(
FragmentManagerImpl.VIEW_STATE_TAG);
Fragment target = getFragment(f.mSavedFragmentState,
FragmentManagerImpl.TARGET_STATE_TAG);
f.mTargetWho = target != null ? target.mWho : null;
if (f.mTargetWho != null) {
f.mTargetRequestCode = f.mSavedFragmentState.getInt(
FragmentManagerImpl.TARGET_REQUEST_CODE_STATE_TAG, 0);
}
if (f.mSavedUserVisibleHint != null) {
f.mUserVisibleHint = f.mSavedUserVisibleHint;
f.mSavedUserVisibleHint = null;
} else {
f.mUserVisibleHint = f.mSavedFragmentState.getBoolean(
FragmentManagerImpl.USER_VISIBLE_HINT_TAG, true);
}
if (!f.mUserVisibleHint) {
f.mDeferStart = true;
if (newState > Fragment.ACTIVITY_CREATED) {
newState = Fragment.ACTIVITY_CREATED;
}
}
}
f.mHost = mHost;
f.mParentFragment = mParent;
f.mFragmentManager = mParent != null
? mParent.mChildFragmentManager : mHost.mFragmentManager;
// 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.mWho) != 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);
}
f.mTargetWho = f.mTarget.mWho;
f.mTarget = null;
}
if (f.mTargetWho != null) {
Fragment target = mActive.get(f.mTargetWho);
if (target == null) {
throw new IllegalStateException("Fragment " + f
+ " declared target fragment " + f.mTargetWho
+ " that does not belong to this FragmentManager!");
}
if (target.mState < Fragment.CREATED) {
moveToState(target, Fragment.CREATED, 0, 0, true);
}
}
dispatchOnFragmentPreAttached(f, mHost.getContext(), false);
f.performAttach();
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);
f.mState = Fragment.CREATED;
}
}
// fall through
case Fragment.CREATED:
// We want to unconditionally run this anytime we do a moveToState that
// moves the Fragment above INITIALIZING, including cases such as when
// we move from CREATED => CREATED as part of the case fall through above.
if (newState > Fragment.INITIALIZING) {
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 = (ViewGroup) mContainer.onFindViewById(f.mContainerId);
if (container == null && !f.mRestored) {
String resName;
try {
resName = f.getResources().getResourceName(f.mContainerId);
} catch (Resources.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.performCreateView(f.performGetLayoutInflater(
f.mSavedFragmentState), container, f.mSavedFragmentState);
if (f.mView != null) {
f.mInnerView = f.mView;
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;
} else {
f.mInnerView = 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) {
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);
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.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) {
// Stop any current animations:
f.mContainer.endViewTransition(f.mView);
f.mView.clearAnimation();
AnimationOrAnimator anim = null;
// If parent is being removed, no need to handle child animations.
if (f.getParentFragment() == null || !f.getParentFragment().mRemoving) {
if (mCurState > Fragment.INITIALIZING && !mDestroyed
&& f.mView.getVisibility() == View.VISIBLE
&& f.mPostponedAlpha >= 0) {
anim = loadAnimation(f, transit, false,
transitionStyle);
}
f.mPostponedAlpha = 0;
if (anim != null) {
animateRemoveFragment(f, anim, newState);
}
f.mContainer.removeView(f.mView);
}
}
f.mContainer = null;
f.mView = null;
// Set here to ensure that Observers are called after
// the Fragment's view is set to null
f.mViewLifecycleOwner = null;
f.mViewLifecycleOwnerLiveData.setValue(null);
f.mInnerView = null;
f.mInLayout = false;
}
// fall through
case Fragment.CREATED:
if (newState < Fragment.CREATED) {
if (mDestroyed) {
// 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.
if (f.getAnimatingAway() != null) {
View v = f.getAnimatingAway();
f.setAnimatingAway(null);
v.clearAnimation();
} else if (f.getAnimator() != null) {
Animator animator = f.getAnimator();
f.setAnimator(null);
animator.cancel();
}
}
if (f.getAnimatingAway() != null || f.getAnimator() != 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);
boolean beingRemoved = f.mRemoving && !f.isInBackStack();
if (beingRemoved || mNonConfig.shouldDestroy(f)) {
boolean shouldClear;
if (mHost instanceof ViewModelStoreOwner) {
shouldClear = mNonConfig.isCleared();
} else if (mHost.getContext() instanceof Activity) {
Activity activity = (Activity) mHost.getContext();
shouldClear = !activity.isChangingConfigurations();
} else {
shouldClear = true;
}
if (beingRemoved || shouldClear) {
mNonConfig.clearNonConfigState(f);
}
f.performDestroy();
dispatchOnFragmentDestroyed(f, false);
} else {
f.mState = Fragment.INITIALIZING;
}
f.performDetach();
dispatchOnFragmentDetached(f, false);
if (!keepActive) {
if (beingRemoved || mNonConfig.shouldDestroy(f)) {
makeInactive(f);
} else {
f.mHost = null;
f.mParentFragment = null;
f.mFragmentManager = null;
if (f.mTargetWho != null) {
Fragment target = mActive.get(f.mTargetWho);
if (target != null && target.getRetainInstance()) {
// Only keep references to other retained Fragments
// to avoid developers accessing Fragments that
// are never coming back
f.mTarget = target;
}
}
}
}
}
}
}
}
if (f.mState != newState) {
Log.w(TAG, "moveToState: Fragment state for " + f + " not updated inline; "
+ "expected state " + newState + " found " + f.mState);
f.mState = newState;
}
}
/**
* Animates the removal of a fragment with the given animator or animation. After animating,
* the fragment's view will be removed from the hierarchy.
*
* @param fragment The fragment to animate out
* @param anim The animator or animation to run on the fragment's view
* @param newState The final state after animating.
*/
private void animateRemoveFragment(@NonNull final Fragment fragment,
@NonNull AnimationOrAnimator anim, final int newState) {
final View viewToAnimate = fragment.mView;
final ViewGroup container = fragment.mContainer;
container.startViewTransition(viewToAnimate);
fragment.setStateAfterAnimating(newState);
if (anim.animation != null) {
Animation animation =
new EndViewTransitionAnimation(anim.animation, container, viewToAnimate);
fragment.setAnimatingAway(fragment.mView);
animation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
// onAnimationEnd() comes during draw(), so there can still be some
// draw events happening after this call. We don't want to detach
// the view until after the onAnimationEnd()
container.post(new Runnable() {
@Override
public void run() {
if (fragment.getAnimatingAway() != null) {
fragment.setAnimatingAway(null);
moveToState(fragment, fragment.getStateAfterAnimating(), 0, 0,
false);
}
}
});
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
fragment.mView.startAnimation(animation);
} else {
Animator animator = anim.animator;
fragment.setAnimator(anim.animator);
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator anim) {
container.endViewTransition(viewToAnimate);
// If an animator ends immediately, we can just pretend there is no animation.
// When that happens the the fragment's view won't have been removed yet.
Animator animator = fragment.getAnimator();
fragment.setAnimator(null);
if (animator != null && container.indexOfChild(viewToAnimate) < 0) {
moveToState(fragment, fragment.getStateAfterAnimating(), 0, 0, false);
}
}
});
animator.setTarget(fragment.mView);
animator.start();
}
}
void moveToState(Fragment f) {
moveToState(f, mCurState, 0, 0, false);
}
void ensureInflatedFragmentView(Fragment f) {
if (f.mFromLayout && !f.mPerformedCreateView) {
f.performCreateView(f.performGetLayoutInflater(
f.mSavedFragmentState), null, f.mSavedFragmentState);
if (f.mView != null) {
f.mInnerView = f.mView;
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);
} else {
f.mInnerView = null;
}
}
}
/**
* 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) {
AnimationOrAnimator anim = loadAnimation(fragment, fragment.getNextTransition(),
!fragment.mHidden, fragment.getNextTransitionStyle());
if (anim != null && anim.animator != null) {
anim.animator.setTarget(fragment.mView);
if (fragment.mHidden) {
if (fragment.isHideReplaced()) {
fragment.setHideReplaced(false);
} else {
final ViewGroup container = fragment.mContainer;
final View animatingView = fragment.mView;
container.startViewTransition(animatingView);
// Delay the actual hide operation until the animation finishes,
// otherwise the fragment will just immediately disappear
anim.animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
container.endViewTransition(animatingView);
animation.removeListener(this);
if (fragment.mView != null && fragment.mHidden) {
fragment.mView.setVisibility(View.GONE);
}
}
});
}
} else {
fragment.mView.setVisibility(View.VISIBLE);
}
anim.animator.start();
} else {
if (anim != null) {
fragment.mView.startAnimation(anim.animation);
anim.animation.start();
}
final int visibility = fragment.mHidden && !fragment.isHideReplaced()
? View.GONE
: View.VISIBLE;
fragment.mView.setVisibility(visibility);
if (fragment.isHideReplaced()) {
fragment.setHideReplaced(false);
}
}
}
if (fragment.mAdded && isMenuAvailable(fragment)) {
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(Fragment f) {
if (f == null) {
return;
}
if (!mActive.containsKey(f.mWho)) {
if (DEBUG) {
Log.v(TAG, "Ignoring moving " + f + " to state " + mCurState
+ "since it is not added to " + this);
}
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
if (f.mPostponedAlpha > 0f) {
f.mView.setAlpha(f.mPostponedAlpha);
}
f.mPostponedAlpha = 0f;
f.mIsNewlyAdded = false;
// run animations:
AnimationOrAnimator anim = loadAnimation(f, f.getNextTransition(), true,
f.getNextTransitionStyle());
if (anim != null) {
if (anim.animation != null) {
f.mView.startAnimation(anim.animation);
} else {
anim.animator.setTarget(f.mView);
anim.animator.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 && newState == mCurState) {
return;
}
mCurState = newState;
// 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);
}
// Now iterate through all active fragments. These will include those that are removed
// and detached.
for (Fragment f : mActive.values()) {
if (f != null && (f.mRemoving || f.mDetached) && !f.mIsNewlyAdded) {
moveFragmentToExpectedState(f);
}
}
startPendingDeferredFragments();
if (mNeedMenuInvalidate && mHost != null && mCurState == Fragment.RESUMED) {
mHost.onSupportInvalidateOptionsMenu();
mNeedMenuInvalidate = false;
}
}
void startPendingDeferredFragments() {
for (Fragment f : mActive.values()) {
if (f != null) {
performPendingDeferredStart(f);
}
}
}
void makeActive(Fragment f) {
if (mActive.get(f.mWho) != null) {
return;
}
mActive.put(f.mWho, f);
if (f.mRetainInstanceChangedWhileDetached) {
if (f.mRetainInstance) {
addRetainedFragment(f);
} else {
removeRetainedFragment(f);
}
f.mRetainInstanceChangedWhileDetached = false;
}
if (DEBUG) Log.v(TAG, "Added fragment to active set " + f);
}
void makeInactive(Fragment f) {
if (mActive.get(f.mWho) == null) {
return;
}
if (DEBUG) Log.v(TAG, "Removed fragment from active set " + f);
// Ensure that any Fragment that had this Fragment as its
// target Fragment retains a reference to the Fragment
for (Fragment fragment : mActive.values()) {
if (fragment != null && f.mWho.equals(fragment.mTargetWho)) {
fragment.mTarget = f;
fragment.mTargetWho = null;
}
}
// Don't remove yet. That happens in burpActive(). This prevents
// concurrent modification while iterating over mActive
mActive.put(f.mWho, null);
removeRetainedFragment(f);
if (f.mTargetWho != null) {
// Restore the target Fragment so that it can be accessed
// even after the Fragment is removed.
f.mTarget = mActive.get(f.mTargetWho);
}
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 (isMenuAvailable(fragment)) {
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) {
synchronized (mAdded) {
mAdded.remove(fragment);
}
if (isMenuAvailable(fragment)) {
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 (isMenuAvailable(fragment)) {
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 (isMenuAvailable(fragment)) {
mNeedMenuInvalidate = true;
}
}
}
}
@Override
@Nullable
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;
}
}
// Now for any known fragment.
for (Fragment f : mActive.values()) {
if (f != null && f.mFragmentId == id) {
return f;
}
}
return null;
}
@Override
@Nullable
public Fragment findFragmentByTag(@Nullable 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 (tag != null) {
// Now for any known fragment.
for (Fragment f : mActive.values()) {
if (f != null && tag.equals(f.mTag)) {
return f;
}
}
}
return null;
}
public Fragment findFragmentByWho(@NonNull String who) {
for (Fragment f : mActive.values()) {
if (f != null && (f = f.findFragmentByWho(who)) != null) {
return f;
}
}
return null;
}
private void checkStateLoss() {
if (isStateSaved()) {
throw new IllegalStateException(
"Can not perform this action after onSaveInstanceState");
}
}
@Override
public boolean isStateSaved() {
// See saveAllState() for the explanation of this. We do this for
// all platform versions, to keep our behavior more consistent between
// them.
return mStateSaved || mStopped;
}
/**
* 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()}
*/
@SuppressWarnings("WeakerAccess") /* synthetic access */
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);
updateOnBackPressedCallbackEnabled();
}
}
}
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 (mHost == null) {
throw new IllegalStateException("Fragment host has been destroyed");
}
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();
}
}
updateOnBackPressedCallbackEnabled();
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;
}
updateOnBackPressedCallbackEnabled();
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
* @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 {
oldPrimaryNav = record.trackAddedFragmentsInPop(mTmpAddedFragments, oldPrimaryNav);
}
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 alpha to 0.
*
* @param fragments The fragments that were added during operation execution. Only the ones
* that are no longer added will have their 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.requireView();
fragment.mPostponedAlpha = view.getAlpha();
view.setAlpha(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.
*/
@SuppressWarnings("WeakerAccess") /* synthetic access */
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);
}
for (Fragment fragment : mActive.values()) {
// Allow added fragments to be removed during the pop since we aren't going
// to move them to the final state with moveToState(mCurState).
if (fragment != null && fragment.mView != null && fragment.mIsNewlyAdded
&& record.interactsWith(fragment.mContainerId)) {
if (fragment.mPostponedAlpha > 0) {
fragment.mView.setAlpha(fragment.mPostponedAlpha);
}
if (moveToState) {
fragment.mPostponedAlpha = 0;
} else {
fragment.mPostponedAlpha = -1;
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 setting their alpha 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() {
for (Fragment fragment : mActive.values()) {
if (fragment != null) {
if (fragment.getAnimatingAway() != null) {
// Give up waiting for the animation and just end it.
final int stateAfterAnimating = fragment.getStateAfterAnimating();
final View animatingAway = fragment.getAnimatingAway();
Animation animation = animatingAway.getAnimation();
if (animation != null) {
animation.cancel();
// force-clear the animation, as Animation#cancel() doesn't work prior to N,
// and will instead cause the animation to infinitely loop
animatingAway.clearAnimation();
}
fragment.setAnimatingAway(null);
moveToState(fragment, stateAfterAnimating, 0, 0, false);
} else if (fragment.getAnimator() != null) {
fragment.getAnimator().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) {
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);
}
@SuppressWarnings("unused")
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;
}
/**
* @deprecated Ideally, all {@link androidx.fragment.app.FragmentHostCallback} instances
* implement ViewModelStoreOwner and we can remove this method entirely.
*/
@Deprecated
FragmentManagerNonConfig retainNonConfig() {
if (mHost instanceof ViewModelStoreOwner) {
throwException(new IllegalStateException("You cannot use retainNonConfig when your "
+ "FragmentHostCallback implements ViewModelStoreOwner."));
}
return mNonConfig.getSnapshot();
}
void saveFragmentViewState(Fragment f) {
if (f.mInnerView == null) {
return;
}
if (mStateArray == null) {
mStateArray = new SparseArray<Parcelable>();
} else {
mStateArray.clear();
}
f.mInnerView.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;
if (mActive.isEmpty()) {
return null;
}
// First collect all active fragments.
int size = mActive.size();
ArrayList<FragmentState> active = new ArrayList<>(size);
boolean haveFragments = false;
for (Fragment f : mActive.values()) {
if (f != null) {
if (f.mFragmentManager != this) {
throwException(new IllegalStateException(
"Failure saving state: active " + f
+ " was removed from the FragmentManager"));
}
haveFragments = true;
FragmentState fs = new FragmentState(f);
active.add(fs);
if (f.mState > Fragment.INITIALIZING && fs.mSavedFragmentState == null) {
fs.mSavedFragmentState = saveFragmentBasicState(f);
if (f.mTargetWho != null) {
Fragment target = mActive.get(f.mTargetWho);
if (target == null) {
throwException(new IllegalStateException(
"Failure saving state: " + f
+ " has target not in fragment manager: "
+ f.mTargetWho));
}
if (fs.mSavedFragmentState == null) {
fs.mSavedFragmentState = new Bundle();
}
putFragment(fs.mSavedFragmentState,
FragmentManagerImpl.TARGET_STATE_TAG, target);
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;
}
ArrayList<String> added = null;
BackStackState[] backStack = null;
// Build list of currently added fragments.
size = mAdded.size();
if (size > 0) {
added = new ArrayList<>(size);
for (Fragment f : mAdded) {
added.add(f.mWho);
if (f.mFragmentManager != this) {
throwException(new IllegalStateException(
"Failure saving state: active " + f
+ " was removed from the FragmentManager"));
}
if (DEBUG) {
Log.v(TAG, "saveAllState: adding fragment (" + f.mWho
+ "): " + f);
}
}
}
// Now save back stack.
if (mBackStack != null) {
size = mBackStack.size();
if (size > 0) {
backStack = new BackStackState[size];
for (int i = 0; i < size; i++) {
backStack[i] = new BackStackState(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;
if (mPrimaryNav != null) {
fms.mPrimaryNavActiveWho = mPrimaryNav.mWho;
}
fms.mNextFragmentIndex = mNextFragmentIndex;
return fms;
}
void restoreAllState(Parcelable state, FragmentManagerNonConfig nonConfig) {
if (mHost instanceof ViewModelStoreOwner) {
throwException(new IllegalStateException("You must use restoreSaveState when your "
+ "FragmentHostCallback implements ViewModelStoreOwner"));
}
mNonConfig.restoreFromSnapshot(nonConfig);
restoreSaveState(state);
}
void restoreSaveState(Parcelable state) {
// If there is no saved state at all, then there's nothing else to do
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.
for (Fragment f : mNonConfig.getRetainedFragments()) {
if (DEBUG) Log.v(TAG, "restoreSaveState: re-attaching retained " + f);
FragmentState fs = null;
for (FragmentState fragmentState : fms.mActive) {
if (fragmentState.mWho.equals(f.mWho)) {
fs = fragmentState;
break;
}
}
if (fs == null) {
if (DEBUG) {
Log.v(TAG, "Discarding retained Fragment " + f
+ " that was not found in the set of active Fragments " + fms.mActive);
}
// We need to ensure that onDestroy and any other clean up is done
// so move the Fragment up to CREATED, then mark it as being removed, then
// destroy it.
moveToState(f, Fragment.CREATED, 0, 0, false);
f.mRemoving = true;
moveToState(f, Fragment.INITIALIZING, 0, 0, false);
continue;
}
fs.mInstance = f;
f.mSavedViewState = null;
f.mBackStackNesting = 0;
f.mInLayout = false;
f.mAdded = false;
f.mTargetWho = f.mTarget != null ? f.mTarget.mWho : null;
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.clear();
for (FragmentState fs : fms.mActive) {
if (fs != null) {
Fragment f = fs.instantiate(mHost.getContext().getClassLoader(),
getFragmentFactory());
f.mFragmentManager = this;
if (DEBUG) Log.v(TAG, "restoreSaveState: active (" + f.mWho + "): " + f);
mActive.put(f.mWho, 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;
}
}
// Build the list of currently added fragments.
mAdded.clear();
if (fms.mAdded != null) {
for (String who : fms.mAdded) {
Fragment f = mActive.get(who);
if (f == null) {
throwException(new IllegalStateException(
"No instantiated fragment for (" + who + ")"));
}
f.mAdded = true;
if (DEBUG) Log.v(TAG, "restoreSaveState: added (" + who + "): " + f);
if (mAdded.contains(f)) {
throw new IllegalStateException("Already added " + f);
}
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(TAG);
PrintWriter pw = new PrintWriter(logw);
bse.dump(" ", pw, false);
pw.close();
}
mBackStack.add(bse);
if (bse.mIndex >= 0) {
setBackStackIndex(bse.mIndex, bse);
}
}
} else {
mBackStack = null;
}
if (fms.mPrimaryNavActiveWho != null) {
mPrimaryNav = mActive.get(fms.mPrimaryNavActiveWho);
dispatchParentPrimaryNavigationFragmentChanged(mPrimaryNav);
}
this.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() {
Collection<Fragment> values = mActive.values();
// values() provides a view into the map, so removing elements from it
// removes the relevant pairs in the Map
values.removeAll(Collections.singleton(null));
}
public void attachController(@NonNull FragmentHostCallback host,
@NonNull FragmentContainer container, @Nullable final Fragment parent) {
if (mHost != null) throw new IllegalStateException("Already attached");
mHost = host;
mContainer = container;
mParent = parent;
if (mParent != null) {
// Since the callback depends on us being the primary navigation fragment,
// update our callback now that we have a parent so that we have the correct
// state by default
updateOnBackPressedCallbackEnabled();
}
// Set up the OnBackPressedCallback
if (host instanceof OnBackPressedDispatcherOwner) {
OnBackPressedDispatcherOwner dispatcherOwner = ((OnBackPressedDispatcherOwner) host);
mOnBackPressedDispatcher = dispatcherOwner.getOnBackPressedDispatcher();
LifecycleOwner owner = parent != null ? parent : dispatcherOwner;
mOnBackPressedDispatcher.addCallback(owner, mOnBackPressedCallback);
}
// Get the FragmentManagerViewModel
if (parent != null) {
mNonConfig = parent.mFragmentManager.getChildNonConfig(parent);
} else if (host instanceof ViewModelStoreOwner) {
ViewModelStore viewModelStore = ((ViewModelStoreOwner) host).getViewModelStore();
mNonConfig = FragmentManagerViewModel.getInstance(viewModelStore);
} else {
mNonConfig = new FragmentManagerViewModel(false);
}
}
public void noteStateNotSaved() {
mStateSaved = false;
mStopped = 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;
mStopped = false;
dispatchStateChange(Fragment.CREATED);
}
public void dispatchActivityCreated() {
mStateSaved = false;
mStopped = false;
dispatchStateChange(Fragment.ACTIVITY_CREATED);
}
public void dispatchStart() {
mStateSaved = false;
mStopped = false;
dispatchStateChange(Fragment.STARTED);
}
public void dispatchResume() {
mStateSaved = false;
mStopped = false;
dispatchStateChange(Fragment.RESUMED);
}
public void dispatchPause() {
dispatchStateChange(Fragment.STARTED);
}
public void dispatchStop() {
mStopped = true;
dispatchStateChange(Fragment.ACTIVITY_CREATED);
}
public void dispatchDestroyView() {
dispatchStateChange(Fragment.CREATED);
}
public void dispatchDestroy() {
mDestroyed = true;
execPendingActions();
dispatchStateChange(Fragment.INITIALIZING);
mHost = null;
mContainer = null;
mParent = null;
if (mOnBackPressedDispatcher != null) {
// mOnBackPressedDispatcher can hold a reference to the host
// so we need to null it out to prevent memory leaks
mOnBackPressedCallback.remove();
mOnBackPressedDispatcher = null;
}
}
private void dispatchStateChange(int nextState) {
try {
mExecutingActions = true;
moveToState(nextState, false);
} finally {
mExecutingActions = false;
}
execPendingActions();
}
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 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 dispatchConfigurationChanged(@NonNull 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 boolean dispatchCreateOptionsMenu(@NonNull Menu menu, @NonNull 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(@NonNull 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(@NonNull 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(@NonNull 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(@NonNull 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.mWho) != f
|| (f.mHost != null && f.getFragmentManager() != this))) {
throw new IllegalArgumentException("Fragment " + f
+ " is not an active fragment of FragmentManager " + this);
}
Fragment previousPrimaryNav = mPrimaryNav;
mPrimaryNav = f;
dispatchParentPrimaryNavigationFragmentChanged(previousPrimaryNav);
dispatchParentPrimaryNavigationFragmentChanged(mPrimaryNav);
}
private void dispatchParentPrimaryNavigationFragmentChanged(@Nullable Fragment f) {
if (f != null && mActive.get(f.mWho) == f) {
f.performPrimaryNavigationFragmentChanged();
}
}
void dispatchPrimaryNavigationFragmentChanged() {
updateOnBackPressedCallbackEnabled();
// Dispatch the change event to this FragmentManager's primary navigation fragment
dispatchParentPrimaryNavigationFragmentChanged(mPrimaryNav);
}
@Override
@Nullable
public Fragment getPrimaryNavigationFragment() {
return mPrimaryNav;
}
public void setMaxLifecycle(Fragment f, Lifecycle.State state) {
if ((mActive.get(f.mWho) != f
|| (f.mHost != null && f.getFragmentManager() != this))) {
throw new IllegalArgumentException("Fragment " + f
+ " is not an active fragment of FragmentManager " + this);
}
f.mMaxState = state;
}
@Override
@NonNull
public FragmentFactory getFragmentFactory() {
FragmentFactory factory = super.getFragmentFactory();
if (factory == DEFAULT_FACTORY) {
if (mParent != null) {
// This can't call setFragmentFactory since we need to
// compute this each time getFragmentFactory() is called
// so that if the parent's FragmentFactory changes, we
// pick the change up here.
return mParent.mFragmentManager.getFragmentFactory();
}
setFragmentFactory(new FragmentFactory() {
@SuppressWarnings("deprecation")
@NonNull
@Override
public Fragment instantiate(@NonNull ClassLoader classLoader,
@NonNull String className) {
return mHost.instantiate(mHost.getContext(), className, null);
}
});
}
return super.getFragmentFactory();
}
@Override
public void registerFragmentLifecycleCallbacks(@NonNull FragmentLifecycleCallbacks cb,
boolean recursive) {
mLifecycleCallbacks.add(new FragmentLifecycleCallbacksHolder(cb, recursive));
}
@Override
public void unregisterFragmentLifecycleCallbacks(@NonNull FragmentLifecycleCallbacks cb) {
synchronized (mLifecycleCallbacks) {
for (int i = 0, N = mLifecycleCallbacks.size(); i < N; i++) {
if (mLifecycleCallbacks.get(i).mCallback == cb) {
mLifecycleCallbacks.remove(i);
break;
}
}
}
}
void dispatchOnFragmentPreAttached(@NonNull Fragment f, @NonNull Context context,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentPreAttached(f, context, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentPreAttached(this, f, context);
}
}
}
void dispatchOnFragmentAttached(@NonNull Fragment f, @NonNull Context context,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentAttached(f, context, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentAttached(this, f, context);
}
}
}
void dispatchOnFragmentPreCreated(@NonNull Fragment f, @Nullable Bundle savedInstanceState,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentPreCreated(f, savedInstanceState, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentPreCreated(this, f, savedInstanceState);
}
}
}
void dispatchOnFragmentCreated(@NonNull Fragment f, @Nullable Bundle savedInstanceState,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentCreated(f, savedInstanceState, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentCreated(this, f, savedInstanceState);
}
}
}
void dispatchOnFragmentActivityCreated(@NonNull Fragment f, @Nullable Bundle savedInstanceState,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentActivityCreated(f, savedInstanceState, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentActivityCreated(this, f, savedInstanceState);
}
}
}
void dispatchOnFragmentViewCreated(@NonNull Fragment f, @NonNull View v,
@Nullable Bundle savedInstanceState, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentViewCreated(f, v, savedInstanceState, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentViewCreated(this, f, v, savedInstanceState);
}
}
}
void dispatchOnFragmentStarted(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentStarted(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentStarted(this, f);
}
}
}
void dispatchOnFragmentResumed(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentResumed(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentResumed(this, f);
}
}
}
void dispatchOnFragmentPaused(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentPaused(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentPaused(this, f);
}
}
}
void dispatchOnFragmentStopped(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentStopped(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentStopped(this, f);
}
}
}
void dispatchOnFragmentSaveInstanceState(@NonNull Fragment f, @NonNull Bundle outState,
boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentSaveInstanceState(f, outState, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentSaveInstanceState(this, f, outState);
}
}
}
void dispatchOnFragmentViewDestroyed(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentViewDestroyed(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentViewDestroyed(this, f);
}
}
}
void dispatchOnFragmentDestroyed(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentDestroyed(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentDestroyed(this, f);
}
}
}
void dispatchOnFragmentDetached(@NonNull Fragment f, boolean onlyRecursive) {
if (mParent != null) {
FragmentManager parentManager = mParent.getFragmentManager();
if (parentManager instanceof FragmentManagerImpl) {
((FragmentManagerImpl) parentManager)
.dispatchOnFragmentDetached(f, true);
}
}
for (FragmentLifecycleCallbacksHolder holder : mLifecycleCallbacks) {
if (!onlyRecursive || holder.mRecursive) {
holder.mCallback.onFragmentDetached(this, f);
}
}
}
// Checks if fragments that belong to this fragment manager (or their children) have menus,
// and if they are visible.
boolean checkForMenus() {
boolean hasMenu = false;
for (Fragment f: mActive.values()) {
if (f != null) {
hasMenu = isMenuAvailable(f);
}
if (hasMenu) {
return true;
}
}
return false;
}
private boolean isMenuAvailable(Fragment f) {
return f.mHasMenu && f.mMenuVisible || f.mChildFragmentManager.checkForMenus();
}
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 final int ANIM_STYLE_OPEN_ENTER = 1;
public static final int ANIM_STYLE_OPEN_EXIT = 2;
public static final int ANIM_STYLE_CLOSE_ENTER = 3;
public static final int ANIM_STYLE_CLOSE_EXIT = 4;
public static final int ANIM_STYLE_FADE_ENTER = 5;
public static final int ANIM_STYLE_FADE_EXIT = 6;
public static int transitToStyleIndex(int transit, boolean enter) {
int animAttr = -1;
switch (transit) {
case FragmentTransaction.TRANSIT_FRAGMENT_OPEN:
animAttr = enter ? ANIM_STYLE_OPEN_ENTER : ANIM_STYLE_OPEN_EXIT;
break;
case FragmentTransaction.TRANSIT_FRAGMENT_CLOSE:
animAttr = enter ? ANIM_STYLE_CLOSE_ENTER : ANIM_STYLE_CLOSE_EXIT;
break;
case FragmentTransaction.TRANSIT_FRAGMENT_FADE:
animAttr = enter ? ANIM_STYLE_FADE_ENTER : ANIM_STYLE_FADE_EXIT;
break;
}
return animAttr;
}
@Override
@Nullable
public View onCreateView(@Nullable View parent, @NonNull String name, @NonNull Context context,
@NonNull AttributeSet attrs) {
if (!"fragment".equals(name)) {
return null;
}
String fname = attrs.getAttributeValue(null, "class");
TypedArray a = context.obtainStyledAttributes(attrs, FragmentTag.Fragment);
if (fname == null) {
fname = a.getString(FragmentTag.Fragment_name);
}
int id = a.getResourceId(FragmentTag.Fragment_id, View.NO_ID);
String tag = a.getString(FragmentTag.Fragment_tag);
a.recycle();
if (fname == null || !FragmentFactory.isFragmentClass(context.getClassLoader(), fname)) {
// Invalid support lib fragment; let the device's framework handle it.
// This will allow android.app.Fragments to do the right thing.
return null;
}
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 = getFragmentFactory().instantiate(context.getClassLoader(), fname);
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;
// Give the Fragment the attributes to initialize itself.
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 onCreateView(null, name, context, attrs);
}
LayoutInflater.Factory2 getLayoutInflaterFactory() {
return this;
}
static class FragmentTag {
public static final int[] Fragment = {
0x01010003, 0x010100d0, 0x010100d1
};
public static final int Fragment_id = 1;
public static final int Fragment_name = 0;
public static final int Fragment_tag = 2;
private FragmentTag() {
}
}
/**
* 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;
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.getChildFragmentManager();
if (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 {
final boolean mIsBack;
final BackStackRecord mRecord;
private int mNumPostponed;
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);
}
}
/**
* Contains either an animator or animation. One of these should be null.
*/
private static class AnimationOrAnimator {
public final Animation animation;
public final Animator animator;
AnimationOrAnimator(Animation animation) {
this.animation = animation;
this.animator = null;
if (animation == null) {
throw new IllegalStateException("Animation cannot be null");
}
}
AnimationOrAnimator(Animator animator) {
this.animation = null;
this.animator = animator;
if (animator == null) {
throw new IllegalStateException("Animator cannot be null");
}
}
}
/**
* We must call endViewTransition() before the animation ends or else the parent doesn't
* get nulled out. We use both startViewTransition() and startAnimation() to solve a problem
* with Views remaining in the hierarchy as disappearing children after the view has been
* removed in some edge cases.
*/
private static class EndViewTransitionAnimation extends AnimationSet implements Runnable {
private final ViewGroup mParent;
private final View mChild;
private boolean mEnded;
private boolean mTransitionEnded;
private boolean mAnimating = true;
EndViewTransitionAnimation(@NonNull Animation animation,
@NonNull ViewGroup parent, @NonNull View child) {
super(false);
mParent = parent;
mChild = child;
addAnimation(animation);
// We must call endViewTransition() even if the animation was never run or it
// is interrupted in a way that can't be detected easily (app put in background)
mParent.post(this);
}
@Override
public boolean getTransformation(long currentTime, Transformation t) {
mAnimating = true;
if (mEnded) {
return !mTransitionEnded;
}
boolean more = super.getTransformation(currentTime, t);
if (!more) {
mEnded = true;
OneShotPreDrawListener.add(mParent, this);
}
return true;
}
@Override
public boolean getTransformation(long currentTime, Transformation outTransformation,
float scale) {
mAnimating = true;
if (mEnded) {
return !mTransitionEnded;
}
boolean more = super.getTransformation(currentTime, outTransformation, scale);
if (!more) {
mEnded = true;
OneShotPreDrawListener.add(mParent, this);
}
return true;
}
@Override
public void run() {
if (!mEnded && mAnimating) {
mAnimating = false;
// Called while animating, so we'll check again on next cycle
mParent.post(this);
} else {
mParent.endViewTransition(mChild);
mTransitionEnded = true;
}
}
}
}