Refactor resetTaskIfNeededLocked for tasks. (e3a74d5d) · Commits · e / os / android_frameworks_base

services/java/com/android/server/am/ActivityStack.java

+338 −2

Original line number	Diff line number	Diff line
		@@ -2219,7 +2219,7 @@ final class ActivityStack {
		* Perform a reset of the given task, if needed as part of launching it.
		* Returns the new HistoryRecord at the top of the task.
		*/
		private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
		/* private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
		ActivityRecord newActivity) {
		mLastHistoryModifier = "resetTaskIfNeededLocked";

		@@ -2563,6 +2563,342 @@ final class ActivityStack {
		}
		return taskTop;
		}
		*/
		/**
		* Helper method for #resetTaskIfNeededLocked.
		* We are inside of the task being reset... we'll either finish this activity, push it out
		* for another task, or leave it as-is.
		* @param task The task containing the Activity (taskTop) that might be reset.
		* @param forceReset
		* @return An ActivityOptions that needs to be processed.
		*/
		private final ActivityOptions resetTargetTaskIfNeededLocked(TaskRecord task,
		boolean forceReset) {
		ActivityOptions topOptions = null;

		int replyChainEnd = -1;
		boolean canMoveOptions = true;

		// We only do this for activities that are not the root of the task (since if we finish
		// the root, we may no longer have the task!).
		final ArrayList<ActivityRecord> activities = task.mActivities;
		final int numActivities = activities.size();
		for (int i = numActivities - 1; i > 0; --i ) {
		ActivityRecord target = activities.get(i);

		final int flags = target.info.flags;
		final boolean finishOnTaskLaunch =
		(flags & ActivityInfo.FLAG_FINISH_ON_TASK_LAUNCH) != 0;
		final boolean allowTaskReparenting =
		(flags & ActivityInfo.FLAG_ALLOW_TASK_REPARENTING) != 0;
		final boolean clearWhenTaskReset =
		(target.intent.getFlags() & Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0;

		if (!finishOnTaskLaunch
		&& !clearWhenTaskReset
		&& target.resultTo != null) {
		// If this activity is sending a reply to a previous
		// activity, we can't do anything with it now until
		// we reach the start of the reply chain.
		// XXX note that we are assuming the result is always
		// to the previous activity, which is almost always
		// the case but we really shouldn't count on.
		if (replyChainEnd < 0) {
		replyChainEnd = i;
		}
		} else if (!finishOnTaskLaunch
		&& !clearWhenTaskReset
		&& allowTaskReparenting
		&& target.taskAffinity != null
		&& !target.taskAffinity.equals(task.affinity)) {
		// If this activity has an affinity for another
		// task, then we need to move it out of here. We will
		// move it as far out of the way as possible, to the
		// bottom of the activity stack. This also keeps it
		// correctly ordered with any activities we previously
		// moved.
		TaskRecord bottomTask = mTaskHistory.get(0);
		ActivityRecord p = bottomTask.mActivities.get(0);
		if (target.taskAffinity != null
		&& target.taskAffinity.equals(p.task.affinity)) {
		// If the activity currently at the bottom has the
		// same task affinity as the one we are moving,
		// then merge it into the same task.
		if (VALIDATE_TASK_REPLACE) Slog.w(TAG,
		"resetTaskFoundIntended: would reparenting " + target + " to bottom " + p.task);
		target.setTask(p.task, p.thumbHolder, false);
		if (DEBUG_TASKS) Slog.v(TAG, "Start pushing activity " + target
		+ " out to bottom task " + p.task);
		} else {
		do {
		mService.mCurTask++;
		if (mService.mCurTask <= 0) {
		mService.mCurTask = 1;
		}
		} while (mTaskIdToTaskRecord.get(mService.mCurTask) != null);
		target.setTask(createTaskRecord(mService.mCurTask, target.info, null, false),
		null, false);
		target.task.affinityIntent = target.intent;
		if (DEBUG_TASKS) Slog.v(TAG, "Start pushing activity " + target
		+ " out to new task " + target.task);
		}

		final TaskRecord targetTask = target.task;
		final int targetTaskId = targetTask.taskId;
		mService.mWindowManager.setAppGroupId(target.appToken, targetTaskId);

		ThumbnailHolder curThumbHolder = target.thumbHolder;
		boolean gotOptions = !canMoveOptions;

		final int start = replyChainEnd < 0 ? i : replyChainEnd;
		for (int srcPos = start; srcPos >= i; --srcPos) {
		p = activities.get(srcPos);
		if (p.finishing) {
		continue;
		}

		curThumbHolder = p.thumbHolder;
		canMoveOptions = false;
		if (!gotOptions && topOptions == null) {
		topOptions = p.takeOptionsLocked();
		if (topOptions != null) {
		gotOptions = true;
		}
		}
		if (DEBUG_ADD_REMOVE) Slog.i(TAG, "Removing activity " + p + " from task="
		+ task + " adding to task=" + targetTask,
		new RuntimeException("here").fillInStackTrace());
		if (DEBUG_TASKS) Slog.v(TAG, "Pushing next activity " + p
		+ " out to target's task " + target.task);
		p.setTask(targetTask, curThumbHolder, false);
		targetTask.addActivityAtBottom(p);
		mHistory.remove(p);
		mHistory.add(0, p);
		mService.mWindowManager.setAppGroupId(p.appToken, targetTaskId);
		}

		mService.mWindowManager.moveTaskToBottom(targetTaskId);
		if (VALIDATE_TOKENS) {
		validateAppTokensLocked();
		}

		replyChainEnd = -1;
		} else if (forceReset \|\| finishOnTaskLaunch \|\| clearWhenTaskReset) {
		// If the activity should just be removed -- either
		// because it asks for it, or the task should be
		// cleared -- then finish it and anything that is
		// part of its reply chain.
		int end;
		if (clearWhenTaskReset) {
		// In this case, we want to finish this activity
		// and everything above it, so be sneaky and pretend
		// like these are all in the reply chain.
		end = numActivities - 1;
		} else if (replyChainEnd < 0) {
		end = i;
		} else {
		end = replyChainEnd;
		}
		ActivityRecord p = null;
		boolean gotOptions = !canMoveOptions;
		for (int srcPos = i; srcPos <= end; srcPos++) {
		p = activities.get(srcPos);
		if (p.finishing) {
		continue;
		}
		canMoveOptions = false;
		if (!gotOptions && topOptions == null) {
		topOptions = p.takeOptionsLocked();
		if (topOptions != null) {
		gotOptions = true;
		}
		}
		if (DEBUG_TASKS \|\| VALIDATE_TASK_REPLACE) Slog.w(TAG,
		"resetTaskIntendedTask: would call finishActivity on " + p);
		if (finishActivityLocked(p, -1, Activity.RESULT_CANCELED, null, "reset",
		false)) {
		end--;
		srcPos--;
		}
		}
		replyChainEnd = -1;
		} else {
		// If we were in the middle of a chain, well the
		// activity that started it all doesn't want anything
		// special, so leave it all as-is.
		replyChainEnd = -1;
		}
		}

		return topOptions;
		}

		/**
		* Helper method for #resetTaskIfNeededLocked. Processes all of the activities in a given
		* TaskRecord looking for an affinity with the task of resetTaskIfNeededLocked.taskTop.
		* @param affinityTask The task we are looking for an affinity to.
		* @param task Task that resetTaskIfNeededLocked.taskTop belongs to.
		* @param topTaskIsHigher True if #task has already been processed by resetTaskIfNeededLocked.
		* @param forceReset Flag passed in to resetTaskIfNeededLocked.
		*/
		private final void resetAffinityTaskIfNeededLocked(TaskRecord affinityTask, TaskRecord task,
		boolean topTaskIsHigher, boolean forceReset
		, ActivityRecord taskTop
		) {
		int replyChainEnd = -1;
		final int taskId = task.taskId;
		final String taskAffinity = task.affinity;

		final ArrayList<ActivityRecord> activities = affinityTask.mActivities;
		final int numActivities = activities.size();
		// Do not operate on the root Activity.
		for (int i = numActivities - 1; i > 0; --i) {
		ActivityRecord target = activities.get(i);

		final int flags = target.info.flags;
		boolean finishOnTaskLaunch = (flags & ActivityInfo.FLAG_FINISH_ON_TASK_LAUNCH) != 0;
		boolean allowTaskReparenting = (flags & ActivityInfo.FLAG_ALLOW_TASK_REPARENTING) != 0;

		if (target.resultTo != null) {
		// If this activity is sending a reply to a previous
		// activity, we can't do anything with it now until
		// we reach the start of the reply chain.
		// XXX note that we are assuming the result is always
		// to the previous activity, which is almost always
		// the case but we really shouldn't count on.
		if (replyChainEnd < 0) {
		replyChainEnd = i;
		}
		} else if (topTaskIsHigher
		&& allowTaskReparenting
		&& taskAffinity != null
		&& taskAffinity.equals(target.taskAffinity)) {
		// This activity has an affinity for our task. Either remove it if we are
		// clearing or move it over to our task. Note that
		// we currently punt on the case where we are resetting a
		// task that is not at the top but who has activities above
		// with an affinity to it... this is really not a normal
		// case, and we will need to later pull that task to the front
		// and usually at that point we will do the reset and pick
		// up those remaining activities. (This only happens if
		// someone starts an activity in a new task from an activity
		// in a task that is not currently on top.)
		if (forceReset \|\| finishOnTaskLaunch) {
		final int start = replyChainEnd >= 0 ? replyChainEnd : i;
		if (DEBUG_TASKS) Slog.v(TAG, "Finishing task at index " + start + " to " + i);
		for (int srcPos = start; srcPos >= i; --srcPos) {
		final ActivityRecord p = activities.get(srcPos);
		if (p.finishing) {
		continue;
		}
		if (VALIDATE_TASK_REPLACE) Slog.w(TAG,
		"resetAffinityTaskIfNeededLocked: calling finishActivity on " + p);
		finishActivityLocked(p, -1, Activity.RESULT_CANCELED, null, "reset",
		false);
		}
		} else {
		int taskTopI = mHistory.indexOf(taskTop);
		final int end = replyChainEnd >= 0 ? replyChainEnd : i;
		if (DEBUG_TASKS) Slog.v(TAG, "Reparenting task at index " + i + " to " + end);
		for (int srcPos = i; srcPos <= end; ++srcPos) {
		final ActivityRecord p = activities.get(srcPos);
		if (p.finishing) {
		continue;
		}
		p.setTask(task, null, false);
		task.addActivityToTop(p);

		mHistory.remove(p);
		mHistory.add(taskTopI--, p);

		if (DEBUG_ADD_REMOVE) Slog.i(TAG, "Removing and adding activity " + p
		+ " to stack at " + task,
		new RuntimeException("here").fillInStackTrace());
		if (DEBUG_TASKS) Slog.v(TAG, "Pulling activity " + p + " from " + srcPos
		+ " in to resetting task " + task);
		mService.mWindowManager.setAppGroupId(p.appToken, taskId);
		}
		mService.mWindowManager.moveTaskToTop(taskId);
		if (VALIDATE_TOKENS) {
		validateAppTokensLocked();
		}
		if (VALIDATE_TASK_REPLACE) {
		verifyActivityRecords(false);
		}

		// Now we've moved it in to place... but what if this is
		// a singleTop activity and we have put it on top of another
		// instance of the same activity? Then we drop the instance
		// below so it remains singleTop.
		if (target.info.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP) {
		ArrayList<ActivityRecord> taskActivities = task.mActivities;
		boolean found = false;
		int targetNdx = taskActivities.indexOf(target);
		if (targetNdx > 0) {
		ActivityRecord p = taskActivities.get(targetNdx - 1);
		if (p.intent.getComponent().equals(target.intent.getComponent())) {
		if (finishActivityLocked(p, -1, Activity.RESULT_CANCELED, null,
		"replace", false)) {
		taskTopI--;
		}
		}
		}
		}
		}

		replyChainEnd = -1;
		}
		}
		}

		private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
		ActivityRecord newActivity) {
		boolean forceReset =
		(newActivity.info.flags & ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0;
		if (ACTIVITY_INACTIVE_RESET_TIME > 0
		&& taskTop.task.getInactiveDuration() > ACTIVITY_INACTIVE_RESET_TIME) {
		if ((newActivity.info.flags & ActivityInfo.FLAG_ALWAYS_RETAIN_TASK_STATE) == 0) {
		forceReset = true;
		}
		}

		final TaskRecord task = taskTop.task;

		/** False until we evaluate the TaskRecord associated with taskTop. Switches to true
		* for remaining tasks. Used for later tasks to reparent to task. */
		boolean taskFound = false;

		/** If ActivityOptions are moved out and need to be aborted or moved to taskTop. */
		ActivityOptions topOptions = null;

		for (int i = mTaskHistory.size() - 1; i >= 0; --i) {
		final TaskRecord targetTask = mTaskHistory.get(i);

		if (targetTask == task) {
		topOptions = resetTargetTaskIfNeededLocked(task, forceReset);
		taskFound = true;
		} else {
		resetAffinityTaskIfNeededLocked(targetTask, task, taskFound, forceReset, taskTop);
		}
		}

		taskTop = task.getTopActivity();
		if (topOptions != null) {
		// If we got some ActivityOptions from an activity on top that
		// was removed from the task, propagate them to the new real top.
		if (taskTop != null) {
		if (VALIDATE_TASK_REPLACE) Slog.w(TAG,
		"newResetTaskIfNeededLocked: would call updateOptionsLocked " + topOptions);
		taskTop.updateOptionsLocked(topOptions);
		} else {
		if (VALIDATE_TASK_REPLACE) Slog.w(TAG,
		"newResetTaskIfNeededLocked: would call " + topOptions + " abort");
		topOptions.abort();
		}
		}

		return taskTop;
		}

		/**
		* Perform clear operation as requested by