| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.app; |
| |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| |
| import java.util.List; |
| |
| /** |
| * An observer / callback to create and register by |
| * {@link ActivityManager#registerHomeVisibilityObserver} so that it's triggered when |
| * visibility of home page changes. |
| * TODO: b/144351078 expose as SystemApi |
| * @hide |
| */ |
| public abstract class HomeVisibilityObserver { |
| private Context mContext; |
| private ActivityManager mActivityManager; |
| /** @hide */ |
| IProcessObserver.Stub mObserver; |
| /** @hide */ |
| boolean mIsHomeActivityVisible; |
| |
| /** @hide */ |
| void init(Context context, ActivityManager activityManager) { |
| mContext = context; |
| mActivityManager = activityManager; |
| mIsHomeActivityVisible = isHomeActivityVisible(); |
| } |
| |
| /** |
| * The API that needs implemented and will be triggered when activity on home page changes. |
| */ |
| public abstract void onHomeVisibilityChanged(boolean isHomeActivityVisible); |
| |
| public HomeVisibilityObserver() { |
| mObserver = new IProcessObserver.Stub() { |
| @Override |
| public void onForegroundActivitiesChanged(int pid, int uid, boolean fg) { |
| boolean isHomeActivityVisible = isHomeActivityVisible(); |
| if (mIsHomeActivityVisible != isHomeActivityVisible) { |
| mIsHomeActivityVisible = isHomeActivityVisible; |
| onHomeVisibilityChanged(mIsHomeActivityVisible); |
| } |
| } |
| |
| @Override |
| public void onForegroundServicesChanged(int pid, int uid, int fgServiceTypes) { |
| } |
| |
| @Override |
| public void onProcessDied(int pid, int uid) { |
| } |
| }; |
| } |
| |
| private boolean isHomeActivityVisible() { |
| List<ActivityManager.RunningTaskInfo> tasks = mActivityManager.getRunningTasks(1); |
| if (tasks == null || tasks.isEmpty()) { |
| return false; |
| } |
| |
| String top = tasks.get(0).topActivity.getPackageName(); |
| if (top == null) { |
| return false; |
| } |
| |
| // We can assume that the screen is idle if the home application is in the foreground. |
| final Intent intent = new Intent(Intent.ACTION_MAIN, null); |
| intent.addCategory(Intent.CATEGORY_HOME); |
| |
| ResolveInfo info = mContext.getPackageManager().resolveActivity(intent, |
| PackageManager.MATCH_DEFAULT_ONLY); |
| if (info != null && top.equals(info.activityInfo.packageName)) { |
| return true; |
| } |
| |
| return false; |
| } |
| } |