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 17package com.android.server.am; 18 19import android.app.AlertDialog; 20import android.app.Service; 21import android.content.ActivityNotFoundException; 22import android.content.Context; 23import android.content.DialogInterface; 24import android.content.Intent; 25import android.content.res.Resources; 26import android.os.Handler; 27import android.os.Message; 28import android.util.Slog; 29import android.view.LayoutInflater; 30import android.view.View; 31import android.view.WindowManager; 32import android.widget.TextView; 33 34import com.android.internal.R; 35 36/** 37 * Dialog to show when a user switch it about to happen. The intent is to snapshot the screen 38 * immediately after the dialog shows so that the user is informed that something is happening 39 * in the background rather than just freeze the screen and not know if the user-switch affordance 40 * was being handled. 41 */ 42final class UserSwitchingDialog extends AlertDialog { 43 private static final String TAG = "ActivityManagerUserSwitchingDialog"; 44 45 private static final int MSG_START_USER = 1; 46 47 private final ActivityManagerService mService; 48 private final int mUserId; 49 50 public UserSwitchingDialog(ActivityManagerService service, Context context, 51 int userId, String userName, boolean aboveSystem) { 52 super(context); 53 54 mService = service; 55 mUserId = userId; 56 57 // Set up the dialog contents 58 setCancelable(false); 59 Resources res = getContext().getResources(); 60 // Custom view due to alignment and font size requirements 61 View view = LayoutInflater.from(getContext()).inflate(R.layout.user_switching_dialog, null); 62 ((TextView) view.findViewById(R.id.message)).setText( 63 res.getString(com.android.internal.R.string.user_switching_message, userName)); 64 setView(view); 65 66 if (aboveSystem) { 67 getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR); 68 } 69 WindowManager.LayoutParams attrs = getWindow().getAttributes(); 70 attrs.privateFlags = WindowManager.LayoutParams.PRIVATE_FLAG_SYSTEM_ERROR | 71 WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS; 72 getWindow().setAttributes(attrs); 73 } 74 75 @Override 76 public void show() { 77 super.show(); 78 // TODO: Instead of just an arbitrary delay, wait for a signal that the window was fully 79 // displayed by the window manager 80 mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_START_USER), 250); 81 } 82 83 private final Handler mHandler = new Handler() { 84 public void handleMessage(Message msg) { 85 switch (msg.what) { 86 case MSG_START_USER: 87 mService.startUserInForeground(mUserId, UserSwitchingDialog.this); 88 break; 89 } 90 } 91 }; 92} 93