RecentsAnimation.java revision ddf62975798eff2a68422d075441a4bfcf1cd6b4 
1/*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.am;
18
19import static android.app.ActivityManager.StackId.INVALID_STACK_ID;
20import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
21import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
22import static android.content.Intent.FLAG_ACTIVITY_NO_ANIMATION;
23import static android.os.Trace.TRACE_TAG_ACTIVITY_MANAGER;
24import static android.view.WindowManager.TRANSIT_NONE;
25import static com.android.server.am.ActivityStackSupervisor.PRESERVE_WINDOWS;
26
27import android.app.ActivityOptions;
28import android.content.ComponentName;
29import android.content.Intent;
30import android.os.Handler;
31import android.os.RemoteException;
32import android.os.Trace;
33import android.util.Slog;
34import android.view.IRecentsAnimationRunner;
35import com.android.server.wm.RecentsAnimationController.RecentsAnimationCallbacks;
36import com.android.server.wm.WindowManagerService;
37
38/**
39 * Manages the recents animation, including the reordering of the stacks for the transition and
40 * cleanup. See {@link com.android.server.wm.RecentsAnimationController}.
41 */
42class RecentsAnimation implements RecentsAnimationCallbacks {
43    private static final String TAG = RecentsAnimation.class.getSimpleName();
44
45    private static final int RECENTS_ANIMATION_TIMEOUT = 10 * 1000;
46
47    private final ActivityManagerService mService;
48    private final ActivityStackSupervisor mStackSupervisor;
49    private final ActivityStartController mActivityStartController;
50    private final WindowManagerService mWindowManager;
51    private final UserController mUserController;
52    private final Handler mHandler;
53
54    private final Runnable mCancelAnimationRunnable;
55
56    // The stack to restore the home stack behind when the animation is finished
57    private ActivityStack mRestoreHomeBehindStack;
58
59    RecentsAnimation(ActivityManagerService am, ActivityStackSupervisor stackSupervisor,
60            ActivityStartController activityStartController, WindowManagerService wm,
61            UserController userController) {
62        mService = am;
63        mStackSupervisor = stackSupervisor;
64        mActivityStartController = activityStartController;
65        mHandler = new Handler(mStackSupervisor.mLooper);
66        mWindowManager = wm;
67        mUserController = userController;
68
69        mCancelAnimationRunnable = () -> {
70            // The caller has not finished the animation in a predefined amount of time, so
71            // force-cancel the animation
72            mWindowManager.cancelRecentsAnimation();
73        };
74    }
75
76    void startRecentsActivity(Intent intent, IRecentsAnimationRunner recentsAnimationRunner,
77            ComponentName recentsComponent, int recentsUid) {
78        Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER, "RecentsAnimation#startRecentsActivity");
79
80        if (!mWindowManager.canStartRecentsAnimation()) {
81            notifyAnimationCancelBeforeStart(recentsAnimationRunner);
82            return;
83        }
84
85        // If the existing home activity is already on top, then cancel
86        ActivityRecord homeActivity = mStackSupervisor.getHomeActivity();
87        final boolean hasExistingHomeActivity = homeActivity != null;
88        if (hasExistingHomeActivity) {
89            final ActivityDisplay display = homeActivity.getDisplay();
90            mRestoreHomeBehindStack = display.getStackAboveHome();
91            if (mRestoreHomeBehindStack == null) {
92                notifyAnimationCancelBeforeStart(recentsAnimationRunner);
93                return;
94            }
95        }
96
97        mWindowManager.deferSurfaceLayout();
98        try {
99
100            final ActivityDisplay display;
101            if (hasExistingHomeActivity) {
102                // Move the home activity into place for the animation if it is not already top most
103                display = homeActivity.getDisplay();
104                display.moveHomeStackBehindBottomMostVisibleStack();
105            } else {
106                // No home activity
107                final ActivityOptions opts = ActivityOptions.makeBasic();
108                opts.setLaunchActivityType(ACTIVITY_TYPE_HOME);
109                opts.setAvoidMoveToFront();
110                intent.addFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_NO_ANIMATION);
111
112                mActivityStartController
113                        .obtainStarter(intent, "startRecentsActivity_noHomeActivity")
114                        .setCallingUid(recentsUid)
115                        .setCallingPackage(recentsComponent.getPackageName())
116                        .setActivityOptions(SafeActivityOptions.fromBundle(opts.toBundle()))
117                        .setMayWait(mUserController.getCurrentUserId())
118                        .execute();
119                mWindowManager.prepareAppTransition(TRANSIT_NONE, false);
120
121                homeActivity = mStackSupervisor.getHomeActivity();
122                display = homeActivity.getDisplay();
123
124                // TODO: Maybe wait for app to draw in this particular case?
125            }
126
127            // Mark the home activity as launch-behind to bump its visibility for the
128            // duration of the gesture that is driven by the recents component
129            homeActivity.mLaunchTaskBehind = true;
130
131            // Post a timeout for the animation. This needs to happen before initializing the
132            // recents animation on the WM side since we may decide to cancel the animation there
133            mHandler.postDelayed(mCancelAnimationRunnable, RECENTS_ANIMATION_TIMEOUT);
134
135            // Fetch all the surface controls and pass them to the client to get the animation
136            // started
137            mWindowManager.initializeRecentsAnimation(recentsAnimationRunner, this,
138                    display.mDisplayId);
139
140            // If we updated the launch-behind state, update the visibility of the activities after
141            // we fetch the visible tasks to be controlled by the animation
142            mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, PRESERVE_WINDOWS);
143        } finally {
144            mWindowManager.continueSurfaceLayout();
145            Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);
146        }
147    }
148
149    @Override
150    public void onAnimationFinished(boolean moveHomeToTop) {
151        mHandler.removeCallbacks(mCancelAnimationRunnable);
152        synchronized (mService) {
153            if (mWindowManager.getRecentsAnimationController() == null) return;
154
155            mWindowManager.inSurfaceTransaction(() -> {
156                Trace.traceBegin(TRACE_TAG_ACTIVITY_MANAGER,
157                        "RecentsAnimation#onAnimationFinished_inSurfaceTransaction");
158                mWindowManager.deferSurfaceLayout();
159                try {
160                    mWindowManager.cleanupRecentsAnimation();
161
162                    // Move the home stack to the front
163                    final ActivityRecord homeActivity = mStackSupervisor.getHomeActivity();
164                    if (homeActivity == null) {
165                        return;
166                    }
167
168                    // Restore the launched-behind state
169                    homeActivity.mLaunchTaskBehind = false;
170
171                    if (moveHomeToTop) {
172                        // Bring the home stack to the front
173                        final ActivityStack homeStack = homeActivity.getStack();
174                        mStackSupervisor.mNoAnimActivities.add(homeActivity);
175                        homeStack.moveToFront("RecentsAnimation.onAnimationFinished()");
176                    } else {
177                        // Restore the home stack to its previous position
178                        final ActivityDisplay display = homeActivity.getDisplay();
179                        display.moveHomeStackBehindStack(mRestoreHomeBehindStack);
180                    }
181
182                    mWindowManager.prepareAppTransition(TRANSIT_NONE, false);
183                    mStackSupervisor.ensureActivitiesVisibleLocked(null, 0, false);
184                    mStackSupervisor.resumeFocusedStackTopActivityLocked();
185
186                    // No reason to wait for the pausing activity in this case, as the hiding of
187                    // surfaces needs to be done immediately.
188                    mWindowManager.executeAppTransition();
189                } finally {
190                    mWindowManager.continueSurfaceLayout();
191                    Trace.traceEnd(TRACE_TAG_ACTIVITY_MANAGER);
192                }
193            });
194        }
195    }
196
197    /**
198     * Called only when the animation should be canceled prior to starting.
199     */
200    private void notifyAnimationCancelBeforeStart(IRecentsAnimationRunner recentsAnimationRunner) {
201        try {
202            recentsAnimationRunner.onAnimationCanceled();
203        } catch (RemoteException e) {
204            Slog.e(TAG, "Failed to cancel recents animation before start", e);
205        }
206    }
207}
208