1 /* 2 * Copyright (C) 2019 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 package android.app.stubs; 17 18 import static android.view.Gravity.LEFT; 19 import static android.view.Gravity.TOP; 20 import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; 21 import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; 22 import static android.view.WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH; 23 import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY; 24 25 import android.app.Service; 26 import android.content.Context; 27 import android.content.Intent; 28 import android.graphics.Color; 29 import android.graphics.Point; 30 import android.hardware.display.DisplayManager; 31 import android.os.IBinder; 32 import android.view.Display; 33 import android.view.View; 34 import android.view.WindowManager; 35 import android.widget.TextView; 36 37 import com.android.compatibility.common.util.UserHelper; 38 39 public class LocalAlertService extends Service { 40 public static final String COMMAND_SHOW_ALERT = "show"; 41 public static final String COMMAND_HIDE_ALERT = "hide"; 42 43 private static View mAlertWindow = null; 44 45 private final UserHelper mUserHelper = new UserHelper(); 46 47 @Override onStartCommand(Intent intent, int flags, int startId)48 public int onStartCommand(Intent intent, int flags, int startId) { 49 String action = intent.getAction(); 50 51 if (COMMAND_SHOW_ALERT.equals(action)) { 52 mAlertWindow = showAlertWindow(getPackageName()); 53 } else if (COMMAND_HIDE_ALERT.equals(action)) { 54 hideAlertWindow(mAlertWindow); 55 mAlertWindow = null; 56 stopSelf(); 57 } 58 return START_NOT_STICKY; 59 } 60 61 @Override onBind(Intent intent)62 public IBinder onBind(Intent intent) { 63 return null; 64 } 65 showAlertWindow(String windowName)66 private View showAlertWindow(String windowName) { 67 final Point size = new Point(); 68 final WindowManager wm = mUserHelper.isVisibleBackgroundUser() 69 ? getContextForSaw(this).getSystemService(WindowManager.class) 70 : getSystemService(WindowManager.class); 71 wm.getDefaultDisplay().getSize(size); 72 73 WindowManager.LayoutParams params = new WindowManager.LayoutParams( 74 TYPE_APPLICATION_OVERLAY, FLAG_NOT_FOCUSABLE | FLAG_WATCH_OUTSIDE_TOUCH | 75 FLAG_NOT_TOUCHABLE); 76 params.width = size.x / 3; 77 params.height = size.y / 3; 78 params.gravity = TOP | LEFT; 79 params.setTitle(windowName); 80 81 final TextView view = new TextView(this); 82 view.setText(windowName); 83 view.setBackgroundColor(Color.RED); 84 wm.addView(view, params); 85 return view; 86 } 87 hideAlertWindow(View window)88 private void hideAlertWindow(View window) { 89 final WindowManager wm = getSystemService(WindowManager.class); 90 wm.removeViewImmediate(window); 91 } 92 getContextForSaw(Context context)93 private Context getContextForSaw(Context context) { 94 final DisplayManager displayManager = context.getSystemService(DisplayManager.class); 95 final Display display = displayManager.getDisplay(mUserHelper.getMainDisplayId()); 96 final Context displayContext = context.createDisplayContext(display); 97 return displayContext.createWindowContext(TYPE_APPLICATION_OVERLAY, null); 98 } 99 } 100