13:调用startActivityUnchecked方法
private int startActivityUnchecked(final ActivityRecord r, ActivityRecord sourceRecord,
IVoiceInteractionSession voiceSession, IVoiceInteractor voiceInteractor,
int startFlags, boolean doResume, ActivityOptions options, TaskRecord inTask,
ActivityRecord[] outActivity) {
setInitialState(r, options, inTask, doResume, startFlags, sourceRecord, voiceSession,
voiceInteractor);
computeLaunchingTaskFlags();
computeSourceStack();
mIntent.setFlags(mLaunchFlags);
ActivityRecord reusedActivity = getReusableIntentActivity();
int preferredWindowingMode = WINDOWING_MODE_UNDEFINED;
int preferredLaunchDisplayId = DEFAULT_DISPLAY;
if (mOptions != null) {
preferredWindowingMode = mOptions.getLaunchWindowingMode();
preferredLaunchDisplayId = mOptions.getLaunchDisplayId();
}
// windowing mode and preferred launch display values from {@link LaunchParams} take
// priority over those specified in {@link ActivityOptions}.
if (!mLaunchParams.isEmpty()) {
if (mLaunchParams.hasPreferredDisplay()) {
preferredLaunchDisplayId = mLaunchParams.mPreferredDisplayId;
}
if (mLaunchParams.hasWindowingMode()) {
preferredWindowingMode = mLaunchParams.mWindowingMode;
}
}
if (reusedActivity != null) {
// When the flags NEW_TASK and CLEAR_TASK are set, then the task gets reused but
// still needs to be a lock task mode violation since the task gets cleared out and
// the device would otherwise leave the locked task.
if (mService.getLockTaskController().isLockTaskModeViolation(reusedActivity.getTask(),
(mLaunchFlags & (FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK))
== (FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK))) {
Slog.e(TAG, "startActivityUnchecked: Attempt to violate Lock Task Mode");
return START_RETURN_LOCK_TASK_MODE_VIOLATION;
}
// True if we are clearing top and resetting of a standard (default) launch mode
// ({@code LAUNCH_MULTIPLE}) activity. The existing activity will be finished.
final boolean clearTopAndResetStandardLaunchMode =
(mLaunchFlags & (FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_RESET_TASK_IF_NEEDED))
== (FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
&& mLaunchMode == LAUNCH_MULTIPLE;
// If mStartActivity does not have a task associated with it, associate it with the
// reused activity's task. Do not do so if we're clearing top and resetting for a
// standard launchMode activity.
if (mStartActivity.getTask() == null && !clearTopAndResetStandardLaunchMode) {
mStartActivity.setTask(reusedActivity.getTask());
}
if (reusedActivity.getTask().intent == null) {
// This task was started because of movement of the activity based on affinity...
// Now that we are actually launching it, we can assign the base intent.
reusedActivity.getTask().setIntent(mStartActivity);
}
// This code path leads to delivering a new intent, we want to make sure we schedule it
// as the first operation, in case the activity will be resumed as a result of later
// operations.
if ((mLaunchFlags & FLAG_ACTIVITY_CLEAR_TOP) != 0
|| isDocumentLaunchesIntoExisting(mLaunchFlags)
|| isLaunchModeOneOf(LAUNCH_SINGLE_INSTANCE, LAUNCH_SINGLE_TASK)) {
final TaskRecord task = reusedActivity.getTask();
// In this situation we want to remove all activities from the task up to the one
// being started. In most cases this means we are resetting the task to its initial
// state.
final ActivityRecord top = task.performClearTaskForReuseLocked(mStartActivity,
mLaunchFlags);
// The above code can remove {@code reusedActivity} from the task, leading to the
// the {@code ActivityRecord} removing its reference to the {@code TaskRecord}. The
// task reference is needed in the call below to
// {@link setTargetStackAndMoveToFrontIfNeeded}.
if (reusedActivity.getTask() == null) {
reusedActivity.setTask(task);
}
if (top != null) {
if (top.frontOfTask) {
// Activity aliases may mean we use different intents for the top activity,
// so make sure the task now has the identity of the new intent.
top.getTask().setIntent(mStartActivity);
}
deliverNewIntent(top);
}
}
mSupervisor.sendPowerHintForLaunchStartIfNeeded(false /* forceSend */, reusedActivity);
reusedActivity = setTargetStackAndMoveToFrontIfNeeded(reusedActivity);
final ActivityRecord outResult =
outActivity != null && outActivity.length > 0 ? outActivity[0] : null;
// When there is a reused activity and the current result is a trampoline activity,
// set the reused activity as the result.
if (outResult != null && (outResult.finishing || outResult.noDisplay)) {
outActivity[0] = reusedActivity;
}
if ((mStartFlags & START_FLAG_ONLY_IF_NEEDED) != 0) {
// We don't need to start a new activity, and the client said not to do anything
// if that is the case, so this is it! And for paranoia, make sure we have
// correctly resumed the top activity.
resumeTargetStackIfNeeded();
return START_RETURN_INTENT_TO_CALLER;
}
if (reusedActivity != null) {
setTaskFromIntentActivity(reusedActivity);
if (!mAddingToTask && mReuseTask == null) {
// We didn't do anything... but it was needed (a.k.a., client don't use that
// intent!) And for paranoia, make sure we have correctly resumed the top activity.
resumeTargetStackIfNeeded();
if (outActivity != null && outActivity.length > 0) {
outActivity[0] = reusedActivity;
}
return mMovedToFront ? START_TASK_TO_FRONT : START_DELIVERED_TO_TOP;
}
}
}
if (mStartActivity.packageName == null) {
final ActivityStack sourceStack = mStartActivity.resultTo != null
? mStartActivity.resultTo.getStack() : null;
if (sourceStack != null) {
sourceStack.sendActivityResultLocked(-1 /* callingUid */, mStartActivity.resultTo,
mStartActivity.resultWho, mStartActivity.requestCode, RESULT_CANCELED,
null /* data */);
}
ActivityOptions.abort(mOptions);
return START_CLASS_NOT_FOUND;
}
// If the activity being launched is the same as the one currently at the top, then
// we need to check if it should only be launched once.
final ActivityStack topStack = mSupervisor.mFocusedStack;
final ActivityRecord topFocused = topStack.getTopActivity();
final ActivityRecord top = topStack.topRunningNonDelayedActivityLocked(mNotTop);
final boolean dontStart = top != null && mStartActivity.resultTo == null
&& top.realActivity.equals(mStartActivity.realActivity)
&& top.userId == mStartActivity.userId
&& top.app != null && top.app.thread != null
&& ((mLaunchFlags & FLAG_ACTIVITY_SINGLE_TOP) != 0
|| isLaunchModeOneOf(LAUNCH_SINGLE_TOP, LAUNCH_SINGLE_TASK));
if (dontStart) {
// For paranoia, make sure we have correctly resumed the top activity.
topStack.mLastPausedActivity = null;
if (mDoResume) {
mSupervisor.resumeFocusedStackTopActivityLocked();
}
ActivityOptions.abort(mOptions);
if ((mStartFlags & START_FLAG_ONLY_IF_NEEDED) != 0) {
// We don't need to start a new activity, and the client said not to do
// anything if that is the case, so this is it!
return START_RETURN_INTENT_TO_CALLER;
}
deliverNewIntent(top);
// Don't use mStartActivity.task to show the toast. We're not starting a new activity
// but reusing 'top'. Fields in mStartActivity may not be fully initialized.
mSupervisor.handleNonResizableTaskIfNeeded(top.getTask(), preferredWindowingMode,
preferredLaunchDisplayId, topStack);
return START_DELIVERED_TO_TOP;
}
boolean newTask = false;
final TaskRecord taskToAffiliate = (mLaunchTaskBehind && mSourceRecord != null)
? mSourceRecord.getTask() : null;
// Should this be considered a new task?
int result = START_SUCCESS;
if (mStartActivity.resultTo == null && mInTask == null && !mAddingToTask
&& (mLaunchFlags & FLAG_ACTIVITY_NEW_TASK) != 0) {
newTask = true;
result = setTaskFromReuseOrCreateNewTask(taskToAffiliate, topStack);
} else if (mSourceRecord != null) {
result = setTaskFromSourceRecord();
} else if (mInTask != null) {
result = setTaskFromInTask();
} else {
// This not being started from an existing activity, and not part of a new task...
// just put it in the top task, though these days this case should never happen.
setTaskToCurrentTopOrCreateNewTask();
}
if (result != START_SUCCESS) {
return result;
}
mService.grantUriPermissionFromIntentLocked(mCallingUid, mStartActivity.packageName,
mIntent, mStartActivity.getUriPermissionsLocked(), mStartActivity.userId);
mService.grantEphemeralAccessLocked(mStartActivity.userId, mIntent,
mStartActivity.appInfo.uid, UserHandle.getAppId(mCallingUid));
if (newTask) {
EventLog.writeEvent(EventLogTags.AM_CREATE_TASK, mStartActivity.userId,
mStartActivity.getTask().taskId);
}
ActivityStack.logStartActivity(
EventLogTags.AM_CREATE_ACTIVITY, mStartActivity, mStartActivity.getTask());
mTargetStack.mLastPausedActivity = null;
mSupervisor.sendPowerHintForLaunchStartIfNeeded(false /* forceSend */, mStartActivity);
mTargetStack.startActivityLocked(mStartActivity, topFocused, newTask, mKeepCurTransition,
mOptions);
if (mDoResume) {
final ActivityRecord topTaskActivity =
mStartActivity.getTask().topRunningActivityLocked();
if (!mTargetStack.isFocusable()
|| (topTaskActivity != null && topTaskActivity.mTaskOverlay
&& mStartActivity != topTaskActivity)) {
// If the activity is not focusable, we can't resume it, but still would like to
// make sure it becomes visible as it starts (this will also trigger entry
// animation). An example of this are PIP activities.
// Also, we don't want to resume activities in a task that currently has an overlay
// as the starting activity just needs to be in the visible paused state until the
// over is removed.
mTargetStack.ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
// Go ahead and tell window manager to execute app transition for this activity
// since the app transition will not be triggered through the resume channel.
mService.mWindowManager.executeAppTransition();
} else {
// If the target stack was not previously focusable (previous top running activity
// on that stack was not visible) then any prior calls to move the stack to the
// will not update the focused stack. If starting the new activity now allows the
// task stack to be focusable, then ensure that we now update the focused stack
// accordingly.
if (mTargetStack.isFocusable() && !mSupervisor.isFocusedStack(mTargetStack)) {
mTargetStack.moveToFront("startActivityUnchecked");
}
mSupervisor.resumeFocusedStackTopActivityLocked(mTargetStack, mStartActivity,
mOptions);
}
} else if (mStartActivity != null) {
mSupervisor.mRecentTasks.add(mStartActivity.getTask());
}
mSupervisor.updateUserStackLocked(mStartActivity.userId, mTargetStack);
mSupervisor.handleNonResizableTaskIfNeeded(mStartActivity.getTask(), preferredWindowingMode,
preferredLaunchDisplayId, mTargetStack);
return START_SUCCESS;
14:mTargetStack.startActivityLocked
void startActivityLocked(ActivityRecord r, ActivityRecord focusedTopActivity,
boolean newTask, boolean keepCurTransition, ActivityOptions options) {
TaskRecord rTask = r.getTask();
final int taskId = rTask.taskId;
// mLaunchTaskBehind tasks get placed at the back of the task stack.
if (!r.mLaunchTaskBehind && (taskForIdLocked(taskId) == null || newTask)) {
// Last activity in task had been removed or ActivityManagerService is reusing task.
// Insert or replace.
// Might not even be in.
insertTaskAtTop(rTask, r);
}
TaskRecord task = null;
if (!newTask) {
// If starting in an existing task, find where that is...
boolean startIt = true;
for (int taskNdx = mTaskHistory.size() - 1; taskNdx >= 0; --taskNdx) {
task = mTaskHistory.get(taskNdx);
if (task.getTopActivity() == null) {
// All activities in task are finishing.
continue;
}
if (task == rTask) {
// Here it is! Now, if this is not yet visible to the
// user, then just add it without starting; it will
// get started when the user navigates back to it.
if (!startIt) {
if (DEBUG_ADD_REMOVE) Slog.i(TAG, "Adding activity " + r + " to task "
+ task, new RuntimeException("here").fillInStackTrace());
r.createWindowContainer();
ActivityOptions.abort(options);
return;
}
break;
} else if (task.numFullscreen > 0) {
startIt = false;
}
}
}
// Place a new activity at top of stack, so it is next to interact with the user.
// If we are not placing the new activity frontmost, we do not want to deliver the
// onUserLeaving callback to the actual frontmost activity
final TaskRecord activityTask = r.getTask();
if (task == activityTask && mTaskHistory.indexOf(task) != (mTaskHistory.size() - 1)) {
mStackSupervisor.mUserLeaving = false;
if (DEBUG_USER_LEAVING) Slog.v(TAG_USER_LEAVING,
"startActivity() behind front, mUserLeaving=false");
}
task = activityTask;
// Slot the activity into the history stack and proceed
if (DEBUG_ADD_REMOVE) Slog.i(TAG, "Adding activity " + r + " to stack to task " + task,
new RuntimeException("here").fillInStackTrace());
// TODO: Need to investigate if it is okay for the controller to already be created by the
// time we get to this point. I think it is, but need to double check.
// Use test in b/34179495 to trace the call path.
if (r.getWindowContainerController() == null) {
r.createWindowContainer();
}
task.setFrontOfTask();
if (!isHomeOrRecentsStack() || numActivities() > 0) {
if (DEBUG_TRANSITION) Slog.v(TAG_TRANSITION,
"Prepare open transition: starting " + r);
if ((r.intent.getFlags() & Intent.FLAG_ACTIVITY_NO_ANIMATION) != 0) {
mWindowManager.prepareAppTransition(TRANSIT_NONE, keepCurTransition);
mStackSupervisor.mNoAnimActivities.add(r);
} else {
int transit = TRANSIT_ACTIVITY_OPEN;
if (newTask) {
if (r.mLaunchTaskBehind) {
transit = TRANSIT_TASK_OPEN_BEHIND;
} else {
// If a new task is being launched, then mark the existing top activity as
// supporting picture-in-picture while pausing only if the starting activity
// would not be considered an overlay on top of the current activity
// (eg. not fullscreen, or the assistant)
if (canEnterPipOnTaskSwitch(focusedTopActivity,
null /* toFrontTask */, r, options)) {
focusedTopActivity.supportsEnterPipOnTaskSwitch = true;
}
transit = TRANSIT_TASK_OPEN;
}
}
mWindowManager.prepareAppTransition(transit, keepCurTransition);
mStackSupervisor.mNoAnimActivities.remove(r);
}
boolean doShow = true;
if (newTask) {
// Even though this activity is starting fresh, we still need
// to reset it to make sure we apply affinities to move any
// existing activities from other tasks in to it.
// If the caller has requested that the target task be
// reset, then do so.
if ((r.intent.getFlags() & Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED) != 0) {
resetTaskIfNeededLocked(r, r);
doShow = topRunningNonDelayedActivityLocked(null) == r;
}
} else if (options != null && options.getAnimationType()
== ActivityOptions.ANIM_SCENE_TRANSITION) {
doShow = false;
}
if (r.mLaunchTaskBehind) {
// Don't do a starting window for mLaunchTaskBehind. More importantly make sure we
// tell WindowManager that r is visible even though it is at the back of the stack.
r.setVisibility(true);
ensureActivitiesVisibleLocked(null, 0, !PRESERVE_WINDOWS);
} else if (SHOW_APP_STARTING_PREVIEW && doShow) {
// Figure out if we are transitioning from another activity that is
// "has the same starting icon" as the next one. This allows the
// window manager to keep the previous window it had previously
// created, if it still had one.
TaskRecord prevTask = r.getTask();
ActivityRecord prev = prevTask.topRunningActivityWithStartingWindowLocked();
if (prev != null) {
// We don't want to reuse the previous starting preview if:
// (1) The current activity is in a different task.
if (prev.getTask() != prevTask) {
prev = null;
}
// (2) The current activity is already displayed.
else if (prev.nowVisible) {
prev = null;
}
}
r.showStartingWindow(prev, newTask, isTaskSwitch(r, focusedTopActivity));
}
} else {
// If this is the first activity, don't do any fancy animations,
// because there is nothing for it to animate on top of.
ActivityOptions.abort(options);
}
16:prepareAppTransition
boolean prepareAppTransitionLocked(@TransitionType int transit, boolean alwaysKeepCurrent,
@TransitionFlags int flags, boolean forceOverride) {
if (DEBUG_APP_TRANSITIONS) Slog.v(TAG, "Prepare app transition:"
+ " transit=" + appTransitionToString(transit)
+ " " + this
+ " alwaysKeepCurrent=" + alwaysKeepCurrent
+ " Callers=" + Debug.getCallers(3));
//计算切换动画的类型:task_open,activity_open等
final boolean allowSetCrashing = !isKeyguardTransit(mNextAppTransition)
&& transit == TRANSIT_CRASHING_ACTIVITY_CLOSE;
if (forceOverride || isKeyguardTransit(transit) || !isTransitionSet()
|| mNextAppTransition == TRANSIT_NONE || allowSetCrashing) {
setAppTransition(transit, flags);
}
// We never want to change from a Keyguard transit to a non-Keyguard transit, as our logic
// relies on the fact that we always execute a Keyguard transition after preparing one. We
// also don't want to change away from a crashing transition.
else if (!alwaysKeepCurrent && !isKeyguardTransit(mNextAppTransition)
&& mNextAppTransition != TRANSIT_CRASHING_ACTIVITY_CLOSE) {
if (transit == TRANSIT_TASK_OPEN && isTransitionEqual(TRANSIT_TASK_CLOSE)) {
// Opening a new task always supersedes a close for the anim.
setAppTransition(transit, flags);
} else if (transit == TRANSIT_ACTIVITY_OPEN
&& isTransitionEqual(TRANSIT_ACTIVITY_CLOSE)) {
// Opening a new activity always supersedes a close for the anim.
setAppTransition(transit, flags);
} else if (isTaskTransit(transit) && isActivityTransit(mNextAppTransition)) {
// Task animations always supersede activity animations, because if we have both, it
// usually means that activity transition were just trampoline activities.
setAppTransition(transit, flags);
}
}
boolean prepared = prepare();
if (isTransitionSet()) {
mService.mH.removeMessages(H.APP_TRANSITION_TIMEOUT);
mService.mH.sendEmptyMessageDelayed(H.APP_TRANSITION_TIMEOUT, APP_TRANSITION_TIMEOUT_MS);//切换动画必须在5s之内完成
}
return prepared;
17：mSupervisor.resumeFocusedStackTopActivityLocked
boolean resumeFocusedStackTopActivityLocked(
ActivityStack targetStack, ActivityRecord target, ActivityOptions targetOptions) {
if (!readyToResume()) {
return false;
}
//将要启动的activity置于栈顶
if (targetStack != null && isFocusedStack(targetStack)) {
return targetStack.resumeTopActivityUncheckedLocked(target, targetOptions);
}
final ActivityRecord r = mFocusedStack.topRunningActivityLocked();
if (r == null || !r.isState(RESUMED)) {
mFocusedStack.resumeTopActivityUncheckedLocked(null, null);
} else if (r.isState(RESUMED)) {
// Kick off any lingering app transitions form the MoveTaskToFront operation.
mFocusedStack.executeAppTransition(targetOptions);
}
return false;
18：resumeTopActivityUncheckedLocked
boolean resumeTopActivityUncheckedLocked(ActivityRecord prev, ActivityOptions options) {
if (mStackSupervisor.inResumeTopActivity) {
// Don't even start recursing.
return false;
}
boolean result = false;
try {
// Protect against recursion.
mStackSupervisor.inResumeTopActivity = true;
result = resumeTopActivityInnerLocked(prev, options);
// When resuming the top activity, it may be necessary to pause the top activity (for
// example, returning to the lock screen. We suppress the normal pause logic in
// {@link #resumeTopActivityUncheckedLocked}, since the top activity is resumed at the
// end. We call the {@link ActivityStackSupervisor#checkReadyForSleepLocked} again here
// to ensure any necessary pause logic occurs. In the case where the Activity will be
// shown regardless of the lock screen, the call to
// {@link ActivityStackSupervisor#checkReadyForSleepLocked} is skipped.
final ActivityRecord next = topRunningActivityLocked(true /* focusableOnly */);
if (next == null || !next.canTurnScreenOn()) {
checkReadyForSleep();
}
} finally {
mStackSupervisor.inResumeTopActivity = false;
}
return result;
19:resumeTopActivityInnerLocked
private boolean resumeTopActivityInnerLocked(ActivityRecord prev, ActivityOptions options) {
if (!mService.mBooting && !mService.mBooted) {
// Not ready yet!
return false;
}
// Find the next top-most activity to resume in this stack that is not finishing and is
// focusable. If it is not focusable, we will fall into the case below to resume the
// top activity in the next focusable task.
final ActivityRecord next = topRunningActivityLocked(true /* focusableOnly */);
final boolean hasRunningActivity = next != null;
// TODO: Maybe this entire condition can get removed?
if (hasRunningActivity && !isAttached()) {
return false;
}
mStackSupervisor.cancelInitializingActivities();
// Remember how we'll process this pause/resume situation, and ensure
// that the state is reset however we wind up proceeding.
boolean userLeaving = mStackSupervisor.mUserLeaving;
mStackSupervisor.mUserLeaving = false;
if (!hasRunningActivity) {
// There are no activities left in the stack, let's look somewhere else.
return resumeTopActivityInNextFocusableStack(prev, options, "noMoreActivities");
}
next.delayedResume = false;
// If the top activity is the resumed one, nothing to do.
if (mResumedActivity == next && next.isState(RESUMED)
&& mStackSupervisor.allResumedActivitiesComplete()) {
// Make sure we have executed any pending transitions, since there
// should be nothing left to do at this point.
executeAppTransition(options);
if (DEBUG_STATES) Slog.d(TAG_STATES,
"resumeTopActivityLocked: Top activity resumed " + next);
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return false;
}
// If we are sleeping, and there is no resumed activity, and the top
// activity is paused, well that is the state we want.
if (shouldSleepOrShutDownActivities()
&& mLastPausedActivity == next
&& mStackSupervisor.allPausedActivitiesComplete()) {
// Make sure we have executed any pending transitions, since there
// should be nothing left to do at this point.
executeAppTransition(options);
if (DEBUG_STATES) Slog.d(TAG_STATES,
"resumeTopActivityLocked: Going to sleep and all paused");
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return false;
}
// Make sure that the user who owns this activity is started. If not,
// we will just leave it as is because someone should be bringing
// another user's activities to the top of the stack.
if (!mService.mUserController.hasStartedUserState(next.userId)) {
Slog.w(TAG, "Skipping resume of top activity " + next
+ ": user " + next.userId + " is stopped");
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return false;
}
// The activity may be waiting for stop, but that is no longer
// appropriate for it.
mStackSupervisor.mStoppingActivities.remove(next);
mStackSupervisor.mGoingToSleepActivities.remove(next);
next.sleeping = false;
mStackSupervisor.mActivitiesWaitingForVisibleActivity.remove(next);
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH, "Resuming " + next);
// If we are currently pausing an activity, then don't do anything until that is done.
if (!mStackSupervisor.allPausedActivitiesComplete()) {
if (DEBUG_SWITCH || DEBUG_PAUSE || DEBUG_STATES) Slog.v(TAG_PAUSE,
"resumeTopActivityLocked: Skip resume: some activity pausing.");
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return false;
}
mStackSupervisor.setLaunchSource(next.info.applicationInfo.uid);
boolean lastResumedCanPip = false;
ActivityRecord lastResumed = null;
final ActivityStack lastFocusedStack = mStackSupervisor.getLastStack();
if (lastFocusedStack != null && lastFocusedStack != this) {
// So, why aren't we using prev here??? See the param comment on the method. prev doesn't
// represent the last resumed activity. However, the last focus stack does if it isn't null.
lastResumed = lastFocusedStack.mResumedActivity;
if (userLeaving && inMultiWindowMode() && lastFocusedStack.shouldBeVisible(next)) {
// The user isn't leaving if this stack is the multi-window mode and the last
// focused stack should still be visible.
if(DEBUG_USER_LEAVING) Slog.i(TAG_USER_LEAVING, "Overriding userLeaving to false"
+ " next=" + next + " lastResumed=" + lastResumed);
userLeaving = false;
}
lastResumedCanPip = lastResumed != null && lastResumed.checkEnterPictureInPictureState(
"resumeTopActivity", userLeaving /* beforeStopping */);
}
// If the flag RESUME_WHILE_PAUSING is set, then continue to schedule the previous activity
// to be paused, while at the same time resuming the new resume activity only if the
// previous activity can't go into Pip since we want to give Pip activities a chance to
// enter Pip before resuming the next activity.
final boolean resumeWhilePausing = (next.info.flags & FLAG_RESUME_WHILE_PAUSING) != 0
&& !lastResumedCanPip;
boolean pausing = mStackSupervisor.pauseBackStacks(userLeaving, next, false);
if (mResumedActivity != null) {
if (DEBUG_STATES) Slog.d(TAG_STATES,
"resumeTopActivityLocked: Pausing " + mResumedActivity);
pausing |= startPausingLocked(userLeaving, false, next, false);
}
if (pausing && !resumeWhilePausing) {
if (DEBUG_SWITCH || DEBUG_STATES) Slog.v(TAG_STATES,
"resumeTopActivityLocked: Skip resume: need to start pausing");
// At this point we want to put the upcoming activity's process
// at the top of the LRU list, since we know we will be needing it
// very soon and it would be a waste to let it get killed if it
// happens to be sitting towards the end.
if (next.app != null && next.app.thread != null) {
mService.updateLruProcessLocked(next.app, true, null);
}
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
if (lastResumed != null) {
lastResumed.setWillCloseOrEnterPip(true);
}
return true;
} else if (mResumedActivity == next && next.isState(RESUMED)
&& mStackSupervisor.allResumedActivitiesComplete()) {
// It is possible for the activity to be resumed when we paused back stacks above if the
// next activity doesn't have to wait for pause to complete.
// So, nothing else to-do except:
// Make sure we have executed any pending transitions, since there
// should be nothing left to do at this point.
executeAppTransition(options);
if (DEBUG_STATES) Slog.d(TAG_STATES,
"resumeTopActivityLocked: Top activity resumed (dontWaitForPause) " + next);
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return true;
}
// If the most recent activity was noHistory but was only stopped rather
// than stopped+finished because the device went to sleep, we need to make
// sure to finish it as we're making a new activity topmost.
if (shouldSleepActivities() && mLastNoHistoryActivity != null &&
!mLastNoHistoryActivity.finishing) {
if (DEBUG_STATES) Slog.d(TAG_STATES,
"no-history finish of " + mLastNoHistoryActivity + " on new resume");
requestFinishActivityLocked(mLastNoHistoryActivity.appToken, Activity.RESULT_CANCELED,
null, "resume-no-history", false);
mLastNoHistoryActivity = null;
}
if (prev != null && prev != next) {
if (!mStackSupervisor.mActivitiesWaitingForVisibleActivity.contains(prev)
&& next != null && !next.nowVisible) {
mStackSupervisor.mActivitiesWaitingForVisibleActivity.add(prev);
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH,
"Resuming top, waiting visible to hide: " + prev);
} else {
// The next activity is already visible, so hide the previous
// activity's windows right now so we can show the new one ASAP.
// We only do this if the previous is finishing, which should mean
// it is on top of the one being resumed so hiding it quickly
// is good. Otherwise, we want to do the normal route of allowing
// the resumed activity to be shown so we can decide if the
// previous should actually be hidden depending on whether the
// new one is found to be full-screen or not.
if (prev.finishing) {
prev.setVisibility(false);
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH,
"Not waiting for visible to hide: " + prev + ", waitingVisible="
+ mStackSupervisor.mActivitiesWaitingForVisibleActivity.contains(prev)
+ ", nowVisible=" + next.nowVisible);
} else {
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH,
"Previous already visible but still waiting to hide: " + prev
+ ", waitingVisible="
+ mStackSupervisor.mActivitiesWaitingForVisibleActivity.contains(prev)
+ ", nowVisible=" + next.nowVisible);
}
}
}
// Launching this app's activity, make sure the app is no longer
// considered stopped.
try {
AppGlobals.getPackageManager().setPackageStoppedState(
next.packageName, false, next.userId); /* TODO: Verify if correct userid */
} catch (RemoteException e1) {
} catch (IllegalArgumentException e) {
Slog.w(TAG, "Failed trying to unstop package "
+ next.packageName + ": " + e);
}
// We are starting up the next activity, so tell the window manager
// that the previous one will be hidden soon. This way it can know
// to ignore it when computing the desired screen orientation.
boolean anim = true;
if (prev != null) {
if (prev.finishing) {
if (DEBUG_TRANSITION) Slog.v(TAG_TRANSITION,
"Prepare close transition: prev=" + prev);
if (mStackSupervisor.mNoAnimActivities.contains(prev)) {
anim = false;
mWindowManager.prepareAppTransition(TRANSIT_NONE, false);
} else {
mWindowManager.prepareAppTransition(prev.getTask() == next.getTask()
? TRANSIT_ACTIVITY_CLOSE
: TRANSIT_TASK_CLOSE, false);
}
prev.setVisibility(false);
} else {
if (DEBUG_TRANSITION) Slog.v(TAG_TRANSITION,
"Prepare open transition: prev=" + prev);
if (mStackSupervisor.mNoAnimActivities.contains(next)) {
anim = false;
mWindowManager.prepareAppTransition(TRANSIT_NONE, false);
} else {
mWindowManager.prepareAppTransition(prev.getTask() == next.getTask()
? TRANSIT_ACTIVITY_OPEN
: next.mLaunchTaskBehind
? TRANSIT_TASK_OPEN_BEHIND
: TRANSIT_TASK_OPEN, false);
}
}
} else {
if (DEBUG_TRANSITION) Slog.v(TAG_TRANSITION, "Prepare open transition: no previous");
if (mStackSupervisor.mNoAnimActivities.contains(next)) {
anim = false;
mWindowManager.prepareAppTransition(TRANSIT_NONE, false);
} else {
mWindowManager.prepareAppTransition(TRANSIT_ACTIVITY_OPEN, false);
}
}
if (anim) {
next.applyOptionsLocked();
} else {
next.clearOptionsLocked();
}
mStackSupervisor.mNoAnimActivities.clear();
ActivityStack lastStack = mStackSupervisor.getLastStack();
if (next.app != null && next.app.thread != null) {
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH, "Resume running: " + next
+ " stopped=" + next.stopped + " visible=" + next.visible);
// If the previous activity is translucent, force a visibility update of
// the next activity, so that it's added to WM's opening app list, and
// transition animation can be set up properly.
// For example, pressing Home button with a translucent activity in focus.
// Launcher is already visible in this case. If we don't add it to opening
// apps, maybeUpdateTransitToWallpaper() will fail to identify this as a
// TRANSIT_WALLPAPER_OPEN animation, and run some funny animation.
final boolean lastActivityTranslucent = lastStack != null
&& (lastStack.inMultiWindowMode()
|| (lastStack.mLastPausedActivity != null
&& !lastStack.mLastPausedActivity.fullscreen));
// The contained logic must be synchronized, since we are both changing the visibility
// and updating the {@link Configuration}. {@link ActivityRecord#setVisibility} will
// ultimately cause the client code to schedule a layout. Since layouts retrieve the
// current {@link Configuration}, we must ensure that the below code updates it before
// the layout can occur.
synchronized(mWindowManager.getWindowManagerLock()) {
// This activity is now becoming visible.
if (!next.visible || next.stopped || lastActivityTranslucent) {
next.setVisibility(true);
}
// schedule launch ticks to collect information about slow apps.
next.startLaunchTickingLocked();
ActivityRecord lastResumedActivity =
lastStack == null ? null :lastStack.mResumedActivity;
final ActivityState lastState = next.getState();
mService.updateCpuStats();
if (DEBUG_STATES) Slog.v(TAG_STATES, "Moving to RESUMED: " + next
+ " (in existing)");
next.setState(RESUMED, "resumeTopActivityInnerLocked");
mService.updateLruProcessLocked(next.app, true, null);
updateLRUListLocked(next);
mService.updateOomAdjLocked();
// Have the window manager re-evaluate the orientation of
// the screen based on the new activity order.
boolean notUpdated = true;
if (mStackSupervisor.isFocusedStack(this)) {
// We have special rotation behavior when here is some active activity that
// requests specific orientation or Keyguard is locked. Make sure all activity
// visibilities are set correctly as well as the transition is updated if needed
// to get the correct rotation behavior. Otherwise the following call to update
// the orientation may cause incorrect configurations delivered to client as a
// result of invisible window resize.
// TODO: Remove this once visibilities are set correctly immediately when
// starting an activity.
notUpdated = !mStackSupervisor.ensureVisibilityAndConfig(next, mDisplayId,
true /* markFrozenIfConfigChanged */, false /* deferResume */);
}
if (notUpdated) {
// The configuration update wasn't able to keep the existing
// instance of the activity, and instead started a new one.
// We should be all done, but let's just make sure our activity
// is still at the top and schedule another run if something
// weird happened.
ActivityRecord nextNext = topRunningActivityLocked();
if (DEBUG_SWITCH || DEBUG_STATES) Slog.i(TAG_STATES,
"Activity config changed during resume: " + next
+ ", new next: " + nextNext);
if (nextNext != next) {
// Do over!
mStackSupervisor.scheduleResumeTopActivities();
}
if (!next.visible || next.stopped) {
next.setVisibility(true);
}
next.completeResumeLocked();
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return true;
}
try {
final ClientTransaction transaction = ClientTransaction.obtain(next.app.thread,
next.appToken);
// Deliver all pending results.
ArrayList<ResultInfo> a = next.results;
if (a != null) {
final int N = a.size();
if (!next.finishing && N > 0) {
if (DEBUG_RESULTS) Slog.v(TAG_RESULTS,
"Delivering results to " + next + ": " + a);
transaction.addCallback(ActivityResultItem.obtain(a));
}
}
if (next.newIntents != null) {
transaction.addCallback(NewIntentItem.obtain(next.newIntents,
false /* andPause */));
}
// Well the app will no longer be stopped.
// Clear app token stopped state in window manager if needed.
next.notifyAppResumed(next.stopped);
EventLog.writeEvent(EventLogTags.AM_RESUME_ACTIVITY, next.userId,
System.identityHashCode(next), next.getTask().taskId,
next.shortComponentName);
next.sleeping = false;
mService.getAppWarningsLocked().onResumeActivity(next);
mService.showAskCompatModeDialogLocked(next);
next.app.pendingUiClean = true;
next.app.forceProcessStateUpTo(mService.mTopProcessState);
next.clearOptionsLocked();
transaction.setLifecycleStateRequest(
ResumeActivityItem.obtain(next.app.repProcState,
mService.isNextTransitionForward()));
mService.getLifecycleManager().scheduleTransaction(transaction);
if (DEBUG_STATES) Slog.d(TAG_STATES, "resumeTopActivityLocked: Resumed "
+ next);
} catch (Exception e) {
// Whoops, need to restart this activity!
if (DEBUG_STATES) Slog.v(TAG_STATES, "Resume failed; resetting state to "
+ lastState + ": " + next);
next.setState(lastState, "resumeTopActivityInnerLocked");
// lastResumedActivity being non-null implies there is a lastStack present.
if (lastResumedActivity != null) {
lastResumedActivity.setState(RESUMED, "resumeTopActivityInnerLocked");
}
Slog.i(TAG, "Restarting because process died: " + next);
if (!next.hasBeenLaunched) {
next.hasBeenLaunched = true;
} else if (SHOW_APP_STARTING_PREVIEW && lastStack != null
&& lastStack.isTopStackOnDisplay()) {
next.showStartingWindow(null /* prev */, false /* newTask */,
false /* taskSwitch */);
}
mStackSupervisor.startSpecificActivityLocked(next, true, false);
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return true;
}
}
try {
next.completeResumeLocked();
} catch (Exception e) {
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return true;
}
} else {
// Whoops, need to restart this activity!
if (!next.hasBeenLaunched) {
next.hasBeenLaunched = true;
} else {
if (SHOW_APP_STARTING_PREVIEW) {
next.showStartingWindow(null /* prev */, false /* newTask */,
false /* taskSwich */);
}
if (DEBUG_SWITCH) Slog.v(TAG_SWITCH, "Restarting: " + next);
}
if (DEBUG_STATES) Slog.d(TAG_STATES, "resumeTopActivityLocked: Restarting " + next);
mStackSupervisor.startSpecificActivityLocked(next, true, true);
}
if (DEBUG_STACK) mStackSupervisor.validateTopActivitiesLocked();
return true;
调用next.setVisibility(true);将要启动的activity设为可见状态，更新lru和oom_adj值
20:调用next.setVisibility(true)
void setVisibility(boolean visible) {
mWindowContainerController.setVisibility(visible, mDeferHidingClient);
mStackSupervisor.getActivityMetricsLogger().notifyVisibilityChanged(this);
}
21:mWindowContainerController的setVisibility方法
mWindowContainerController为AppWindowContainerController类型
public void setVisibility(boolean visible, boolean deferHidingClient) {
synchronized(mWindowMap) {
if (mContainer == null) {
Slog.w(TAG_WM, "Attempted to set visibility of non-existing app token: "
+ mToken);
return;
}
final AppWindowToken wtoken = mContainer;
if (!visible && wtoken.hiddenRequested) {
if (!deferHidingClient && wtoken.mDeferHidingClient) {
// We previously deferred telling the client to hide itself when visibility was
// initially set to false. Now we would like it to hide, so go ahead and set it.
wtoken.mDeferHidingClient = deferHidingClient;
wtoken.setClientHidden(true);
}
return;
}
mService.mOpeningApps.remove(wtoken);
mService.mClosingApps.remove(wtoken);
wtoken.waitingToShow = false;
wtoken.hiddenRequested = !visible;
wtoken.mDeferHidingClient = deferHidingClient;
if (!visible) {
wtoken.removeDeadWindows();
} else {
if (!mService.mAppTransition.isTransitionSet()
&& mService.mAppTransition.isReady()) {
mService.mOpeningApps.add(wtoken);
}
wtoken.startingMoved = false;
if (wtoken.isHidden() || wtoken.mAppStopped) {
wtoken.clearAllDrawn();
// If the app was already visible, don't reset the waitingToShow state.
if (wtoken.isHidden()) {
wtoken.waitingToShow = true;
}
}
wtoken.setClientHidden(false);
wtoken.requestUpdateWallpaperIfNeeded();
wtoken.mAppStopped = false;
mContainer.transferStartingWindowFromHiddenAboveTokenIfNeeded();
}
if (wtoken.okToAnimate() && mService.mAppTransition.isTransitionSet()) {
wtoken.inPendingTransaction = true;
if (visible) {
mService.mOpeningApps.add(wtoken);
wtoken.mEnteringAnimation = true;
} else {
mService.mClosingApps.add(wtoken);
wtoken.mEnteringAnimation = false;
}
if (mService.mAppTransition.getAppTransition()
== WindowManager.TRANSIT_TASK_OPEN_BEHIND) {
// We're launchingBehind, add the launching activity to mOpeningApps.
final WindowState win =
mService.getDefaultDisplayContentLocked().findFocusedWindow();
if (win != null) {
final AppWindowToken focusedToken = win.mAppToken;
if (focusedToken != null) {
if (DEBUG_APP_TRANSITIONS) Slog.d(TAG_WM, "TRANSIT_TASK_OPEN_BEHIND, "
+ " adding " + focusedToken + " to mOpeningApps");
// Force animation to be loaded.
focusedToken.setHidden(true);
mService.mOpeningApps.add(focusedToken);
}
}
}
return;
}
wtoken.setVisibility(null, visible, TRANSIT_UNSET, true, wtoken.mVoiceInteraction);
wtoken.updateReportedVisibilityLocked();
}
}
22:调用mtoken的setVisibility方法
mtoken为AppWindowToken对象，是应用程序窗口在wms端的描述
boolean setVisibility(WindowManager.LayoutParams lp,
boolean visible, int transit, boolean performLayout, boolean isVoiceInteraction) {
boolean delayed = false;
inPendingTransaction = false;
mHiddenSetFromTransferredStartingWindow = false;
boolean visibilityChanged = false;
if (isHidden() == visible || (isHidden() && mIsExiting) || (visible && waitingForReplacement())) {
final AccessibilityController accessibilityController = mService.mAccessibilityController;
boolean changed = false;
boolean runningAppAnimation = false;
if (transit != WindowManager.TRANSIT_UNSET) {
if (applyAnimationLocked(lp, transit, visible, isVoiceInteraction)) {
delayed = runningAppAnimation = true;
}
final WindowState window = findMainWindow();
//TODO (multidisplay): Magnification is supported only for the default display.
if (window != null && accessibilityController != null
&& getDisplayContent().getDisplayId() == DEFAULT_DISPLAY) {
accessibilityController.onAppWindowTransitionLocked(window, transit);
}
changed = true;
}
final int windowsCount = mChildren.size();
for (int i = 0; i < windowsCount; i++) {
final WindowState win = mChildren.get(i);
changed |= win.onAppVisibilityChanged(visible, runningAppAnimation);
}
setHidden(!visible);
hiddenRequested = !visible;
visibilityChanged = true;
if (!visible) {
stopFreezingScreen(true, true);
} else {
if (startingWindow != null && !startingWindow.isDrawnLw()) {
startingWindow.mPolicyVisibility = false;
startingWindow.mPolicyVisibilityAfterAnim = false;
}
forAllWindows(mService::makeWindowFreezingScreenIfNeededLocked, true);
}
if (DEBUG_APP_TRANSITIONS) Slog.v(TAG_WM, "setVisibility: " + this
+ ": hidden=" + isHidden() + " hiddenRequested=" + hiddenRequested);
if (changed) {
mService.mInputMonitor.setUpdateInputWindowsNeededLw();
if (performLayout) {
mService.updateFocusedWindowLocked(UPDATE_FOCUS_WILL_PLACE_SURFACES,
false /*updateInputWindows*/);
mService.mWindowPlacerLocked.performSurfacePlacement();
}
mService.mInputMonitor.updateInputWindowsLw(false /*force*/);
}
}
if (isReallyAnimating()) {
delayed = true;
} else {
onAnimationFinished();
}
for (int i = mChildren.size() - 1; i >= 0 && !delayed; i--) {
if ((mChildren.get(i)).isSelfOrChildAnimating()) {
delayed = true;
}
}
if (visibilityChanged) {
if (visible && !delayed) {
mEnteringAnimation = true;
mService.mActivityManagerAppTransitionNotifier.onAppTransitionFinishedLocked(token);
}
if (visible || !isReallyAnimating()) {
setClientHidden(!visible);
}
if (!mService.mClosingApps.contains(this) && !mService.mOpeningApps.contains(this)) {
mService.getDefaultDisplayContentLocked().getDockedDividerController()
.notifyAppVisibilityChanged();
mService.mTaskSnapshotController.notifyAppVisibilityChanged(this, visible);
}
if (isHidden() && !delayed && !mService.mAppTransition.isTransitionSet()) {
SurfaceControl.openTransaction();
for (int i = mChildren.size() - 1; i >= 0; i--) {
mChildren.get(i).mWinAnimator.hide("immediately hidden");
}
SurfaceControl.closeTransaction();
}
}
return delayed;
23:applyAnimationLocked
boolean applyAnimationLocked(WindowManager.LayoutParams lp, int transit, boolean enter,
boolean isVoiceInteraction) {
if (mService.mDisableTransitionAnimation || !shouldAnimate(transit)) {
if (DEBUG_APP_TRANSITIONS || DEBUG_ANIM) {
Slog.v(TAG_WM, "applyAnimation: transition animation is disabled or skipped."
+ " atoken=" + this);
}
cancelAnimation();
return false;
}
// Only apply an animation if the display isn't frozen. If it is frozen, there is no reason
// to animate and it can cause strange artifacts when we unfreeze the display if some
// different animation is running.
Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "AWT#applyAnimationLocked");
if (okToAnimate()) {
final AnimationAdapter adapter;
final TaskStack stack = getStack();
mTmpPoint.set(0, 0);
mTmpRect.setEmpty();
if (stack != null) {
stack.getRelativePosition(mTmpPoint);
stack.getBounds(mTmpRect);
mTmpRect.offsetTo(0, 0);
}
// Delaying animation start isn't compatible with remote animations at all.
if (mService.mAppTransition.getRemoteAnimationController() != null
&& !mSurfaceAnimator.isAnimationStartDelayed()) {
adapter = mService.mAppTransition.getRemoteAnimationController()
.createAnimationAdapter(this, mTmpPoint, mTmpRect);
} else {
final Animation a = loadAnimation(lp, transit, enter, isVoiceInteraction);
if (a != null) {
adapter = new LocalAnimationAdapter(
new WindowAnimationSpec(a, mTmpPoint, mTmpRect,
mService.mAppTransition.canSkipFirstFrame(),
mService.mAppTransition.getAppStackClipMode(),
true /* isAppAnimation */),
mService.mSurfaceAnimationRunner);
if (a.getZAdjustment() == Animation.ZORDER_TOP) {
mNeedsZBoost = true;
}
mTransit = transit;
mTransitFlags = mService.mAppTransition.getTransitFlags();
} else {
adapter = null;
}
}
if (adapter != null) {
startAnimation(getPendingTransaction(), adapter, !isVisible());
if (adapter.getShowWallpaper()) {
mDisplayContent.pendingLayoutChanges |= FINISH_LAYOUT_REDO_WALLPAPER;
}
}
} else {
cancelAnimation();
}
Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
return isReallyAnimating();
24:loadAnimation
private Animation loadAnimation(WindowManager.LayoutParams lp, int transit, boolean enter,
boolean isVoiceInteraction) {
final DisplayContent displayContent = getTask().getDisplayContent();
final DisplayInfo displayInfo = displayContent.getDisplayInfo();
final int width = displayInfo.appWidth;
final int height = displayInfo.appHeight;
if (DEBUG_APP_TRANSITIONS || DEBUG_ANIM) Slog.v(TAG_WM,
"applyAnimation: atoken=" + this);
// Determine the visible rect to calculate the thumbnail clip
final WindowState win = findMainWindow();
final Rect frame = new Rect(0, 0, width, height);
final Rect displayFrame = new Rect(0, 0,
displayInfo.logicalWidth, displayInfo.logicalHeight);
final Rect insets = new Rect();
final Rect stableInsets = new Rect();
Rect surfaceInsets = null;
final boolean freeform = win != null && win.inFreeformWindowingMode();
if (win != null) {
// Containing frame will usually cover the whole screen, including dialog windows.
// For freeform workspace windows it will not cover the whole screen and it also
// won't exactly match the final freeform window frame (e.g. when overlapping with
// the status bar). In that case we need to use the final frame.
if (freeform) {
frame.set(win.mFrame);
} else if (win.isLetterboxedAppWindow()) {
frame.set(getTask().getBounds());
} else if (win.isDockedResizing()) {
// If we are animating while docked resizing, then use the stack bounds as the
// animation target (which will be different than the task bounds)
frame.set(getTask().getParent().getBounds());
} else {
frame.set(win.mContainingFrame);
}
surfaceInsets = win.getAttrs().surfaceInsets;
// XXX(b/72757033): These are insets relative to the window frame, but we're really
// interested in the insets relative to the frame we chose in the if-blocks above.
insets.set(win.mContentInsets);
stableInsets.set(win.mStableInsets);
}
if (mLaunchTaskBehind) {
// Differentiate the two animations. This one which is briefly on the screen
// gets the !enter animation, and the other activity which remains on the
// screen gets the enter animation. Both appear in the mOpeningApps set.
enter = false;
}
if (DEBUG_APP_TRANSITIONS) Slog.d(TAG_WM, "Loading animation for app transition."
+ " transit=" + AppTransition.appTransitionToString(transit) + " enter=" + enter
+ " frame=" + frame + " insets=" + insets + " surfaceInsets=" + surfaceInsets);
final Configuration displayConfig = displayContent.getConfiguration();
final Animation a = mService.mAppTransition.loadAnimation(lp, transit, enter,
displayConfig.uiMode, displayConfig.orientation, frame, displayFrame, insets,
surfaceInsets, stableInsets, isVoiceInteraction, freeform, getTask().mTaskId);
if (a != null) {
if (DEBUG_ANIM) logWithStack(TAG, "Loaded animation " + a + " for " + this);
final int containingWidth = frame.width();
final int containingHeight = frame.height();
a.initialize(containingWidth, containingHeight, width, height);
a.scaleCurrentDuration(mService.getTransitionAnimationScaleLocked());
}
return a;
通过windowmanagerService调用apptransition的loadAnimation方法
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