1 /* 2 * Copyright (C) 2014 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.server.am; 18 19 import android.app.AlertDialog; 20 import android.content.Context; 21 import android.content.res.Resources; 22 import android.view.LayoutInflater; 23 import android.view.View; 24 import android.view.ViewTreeObserver; 25 import android.view.WindowManager; 26 import android.widget.TextView; 27 28 import com.android.internal.R; 29 30 /** 31 * Dialog to show when a user switch it about to happen. The intent is to snapshot the screen 32 * immediately after the dialog shows so that the user is informed that something is happening 33 * in the background rather than just freeze the screen and not know if the user-switch affordance 34 * was being handled. 35 */ 36 final class UserSwitchingDialog extends AlertDialog 37 implements ViewTreeObserver.OnWindowShownListener { 38 private static final String TAG = "ActivityManagerUserSwitchingDialog"; 39 40 private final ActivityManagerService mService; 41 private final int mUserId; 42 43 public UserSwitchingDialog(ActivityManagerService service, Context context, 44 int userId, String userName, boolean aboveSystem) { 45 super(context); 46 47 mService = service; 48 mUserId = userId; 49 50 // Set up the dialog contents 51 setCancelable(false); 52 Resources res = getContext().getResources(); 53 // Custom view due to alignment and font size requirements 54 View view = LayoutInflater.from(getContext()).inflate(R.layout.user_switching_dialog, null); 55 ((TextView) view.findViewById(R.id.message)).setText( 56 res.getString(com.android.internal.R.string.user_switching_message, userName)); 57 setView(view); 58 59 if (aboveSystem) { 60 getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR); 61 } 62 WindowManager.LayoutParams attrs = getWindow().getAttributes(); 63 attrs.privateFlags = WindowManager.LayoutParams.PRIVATE_FLAG_SYSTEM_ERROR | 64 WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; 65 getWindow().setAttributes(attrs); 66 } 67 68 @Override 69 public void show() { 70 // Slog.v(TAG, "show called"); 71 super.show(); 72 final View decorView = getWindow().getDecorView(); 73 if (decorView != null) { 74 decorView.getViewTreeObserver().addOnWindowShownListener(this); 75 } 76 } 77 78 @Override 79 public void onWindowShown() { 80 // Slog.v(TAG, "onWindowShown called"); 81 mService.startUserInForeground(mUserId, this); 82 final View decorView = getWindow().getDecorView(); 83 if (decorView != null) { 84 decorView.getViewTreeObserver().removeOnWindowShownListener(this); 85 } 86 } 87 } 88