UserSwitchingDialog.java revision 9c79504225f60c72c947220b6aca928f11279e1c 
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.content.Context;
21import android.content.res.Resources;
22import android.view.LayoutInflater;
23import android.view.View;
24import android.view.ViewTreeObserver;
25import android.view.WindowManager;
26import android.widget.TextView;
27
28import 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 */
36final 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