1 /* 2 * Copyright (C) 2020 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 17 package com.android.launcher3; 18 19 import com.android.systemui.shared.system.RemoteAnimationTargetCompat; 20 21 import java.lang.ref.WeakReference; 22 23 /** 24 * This class is needed to wrap any animation runner that is a part of the 25 * RemoteAnimationDefinition: 26 * - Launcher creates a new instance of the LauncherAppTransitionManagerImpl whenever it is 27 * created, which in turn registers a new definition 28 * - When the definition is registered, window manager retains a strong binder reference to the 29 * runner passed in 30 * - If the Launcher activity is recreated, the new definition registered will replace the old 31 * reference in the system's activity record, but until the system server is GC'd, the binder 32 * reference will still exist, which references the runner in the Launcher process, which 33 * references the (old) Launcher activity through this class 34 * 35 * Instead we make the runner provided to the definition static only holding a weak reference to 36 * the runner implementation. When this animation manager is destroyed, we remove the Launcher 37 * reference to the runner, leaving only the weak ref from the runner. 38 */ 39 public class WrappedLauncherAnimationRunner<R extends WrappedAnimationRunnerImpl> 40 extends LauncherAnimationRunner { 41 private WeakReference<R> mImpl; 42 WrappedLauncherAnimationRunner(R animationRunnerImpl, boolean startAtFrontOfQueue)43 public WrappedLauncherAnimationRunner(R animationRunnerImpl, boolean startAtFrontOfQueue) { 44 super(animationRunnerImpl.getHandler(), startAtFrontOfQueue); 45 mImpl = new WeakReference<>(animationRunnerImpl); 46 } 47 48 @Override onCreateAnimation(RemoteAnimationTargetCompat[] appTargets, RemoteAnimationTargetCompat[] wallpaperTargets, AnimationResult result)49 public void onCreateAnimation(RemoteAnimationTargetCompat[] appTargets, 50 RemoteAnimationTargetCompat[] wallpaperTargets, AnimationResult result) { 51 R animationRunnerImpl = mImpl.get(); 52 if (animationRunnerImpl != null) { 53 animationRunnerImpl.onCreateAnimation(appTargets, wallpaperTargets, result); 54 } 55 } 56 } 57