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 */ 16package com.android.quickstep; 17 18import android.annotation.TargetApi; 19import android.content.Context; 20import android.content.Intent; 21import android.os.Build; 22import android.os.Bundle; 23import android.os.Handler; 24 25import com.android.launcher3.MainThreadExecutor; 26import com.android.quickstep.ActivityControlHelper.ActivityInitListener; 27import com.android.quickstep.util.RemoteAnimationProvider; 28 29import java.lang.ref.WeakReference; 30import java.util.function.BiPredicate; 31 32/** 33 * Utility class to track create/destroy for RecentsActivity 34 */ 35@TargetApi(Build.VERSION_CODES.P) 36public class RecentsActivityTracker implements ActivityInitListener { 37 38 private static WeakReference<RecentsActivity> sCurrentActivity = new WeakReference<>(null); 39 private static final Scheduler sScheduler = new Scheduler(); 40 41 private final BiPredicate<RecentsActivity, Boolean> mOnInitListener; 42 43 public RecentsActivityTracker(BiPredicate<RecentsActivity, Boolean> onInitListener) { 44 mOnInitListener = onInitListener; 45 } 46 47 @Override 48 public void register() { 49 sScheduler.schedule(this); 50 } 51 52 @Override 53 public void unregister() { 54 sScheduler.clearReference(this); 55 } 56 57 private boolean init(RecentsActivity activity, boolean visible) { 58 return mOnInitListener.test(activity, visible); 59 } 60 61 public static RecentsActivity getCurrentActivity() { 62 return sCurrentActivity.get(); 63 } 64 65 @Override 66 public void registerAndStartActivity(Intent intent, RemoteAnimationProvider animProvider, 67 Context context, Handler handler, long duration) { 68 register(); 69 70 Bundle options = animProvider.toActivityOptions(handler, duration).toBundle(); 71 context.startActivity(intent, options); 72 } 73 74 public static void onRecentsActivityCreate(RecentsActivity activity) { 75 sCurrentActivity = new WeakReference<>(activity); 76 sScheduler.initIfPending(activity, false); 77 } 78 79 80 public static void onRecentsActivityNewIntent(RecentsActivity activity) { 81 sScheduler.initIfPending(activity, activity.isStarted()); 82 } 83 84 public static void onRecentsActivityDestroy(RecentsActivity activity) { 85 if (sCurrentActivity.get() == activity) { 86 sCurrentActivity.clear(); 87 } 88 } 89 90 91 private static class Scheduler implements Runnable { 92 93 private WeakReference<RecentsActivityTracker> mPendingTracker = new WeakReference<>(null); 94 private MainThreadExecutor mMainThreadExecutor; 95 96 public synchronized void schedule(RecentsActivityTracker tracker) { 97 mPendingTracker = new WeakReference<>(tracker); 98 if (mMainThreadExecutor == null) { 99 mMainThreadExecutor = new MainThreadExecutor(); 100 } 101 mMainThreadExecutor.execute(this); 102 } 103 104 @Override 105 public void run() { 106 RecentsActivity activity = sCurrentActivity.get(); 107 if (activity != null) { 108 initIfPending(activity, activity.isStarted()); 109 } 110 } 111 112 public synchronized boolean initIfPending(RecentsActivity activity, boolean alreadyOnHome) { 113 RecentsActivityTracker tracker = mPendingTracker.get(); 114 if (tracker != null) { 115 if (!tracker.init(activity, alreadyOnHome)) { 116 mPendingTracker.clear(); 117 } 118 return true; 119 } 120 return false; 121 } 122 123 public synchronized boolean clearReference(RecentsActivityTracker tracker) { 124 if (mPendingTracker.get() == tracker) { 125 mPendingTracker.clear(); 126 return true; 127 } 128 return false; 129 } 130 } 131} 132