1/*
2 * Copyright (C) 2013 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.ActivityManager;
20import android.content.Context;
21import android.os.Handler;
22import android.os.Message;
23import android.os.SystemClock;
24import android.util.Slog;
25import android.view.WindowManager;
26import android.widget.Toast;
27
28import com.android.internal.R;
29
30/**
31 *  Helper to manage showing/hiding a image to notify them that they are entering
32 *  or exiting lock-to-app mode.
33 */
34public class LockTaskNotify {
35    private static final String TAG = "LockTaskNotify";
36    private static final long SHOW_TOAST_MINIMUM_INTERVAL = 1000;
37
38    private final Context mContext;
39    private final H mHandler;
40    private Toast mLastToast;
41    private long mLastShowToastTime;
42
43    public LockTaskNotify(Context context) {
44        mContext = context;
45        mHandler = new H();
46    }
47
48    public void showToast(int lockTaskModeState) {
49        mHandler.obtainMessage(H.SHOW_TOAST, lockTaskModeState, 0 /* Not used */).sendToTarget();
50    }
51
52    public void handleShowToast(int lockTaskModeState) {
53        String text = null;
54        if (lockTaskModeState == ActivityManager.LOCK_TASK_MODE_LOCKED) {
55            text = mContext.getString(R.string.lock_to_app_toast_locked);
56        } else if (lockTaskModeState == ActivityManager.LOCK_TASK_MODE_PINNED) {
57            text = mContext.getString(R.string.lock_to_app_toast);
58        }
59        if (text == null) {
60            return;
61        }
62        long showToastTime = SystemClock.elapsedRealtime();
63        if ((showToastTime - mLastShowToastTime) < SHOW_TOAST_MINIMUM_INTERVAL) {
64            Slog.i(TAG, "Ignore toast since it is requested in very short interval.");
65            return;
66        }
67        if (mLastToast != null) {
68            mLastToast.cancel();
69        }
70        mLastToast = makeAllUserToastAndShow(text);
71        mLastShowToastTime = showToastTime;
72    }
73
74    public void show(boolean starting) {
75        int showString = R.string.lock_to_app_exit;
76        if (starting) {
77            showString = R.string.lock_to_app_start;
78        }
79        makeAllUserToastAndShow(mContext.getString(showString));
80    }
81
82    private Toast makeAllUserToastAndShow(String text) {
83        Toast toast = Toast.makeText(mContext, text, Toast.LENGTH_LONG);
84        toast.getWindowParams().privateFlags |=
85                WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
86        toast.show();
87        return toast;
88    }
89
90    private final class H extends Handler {
91        private static final int SHOW_TOAST = 3;
92
93        @Override
94        public void handleMessage(Message msg) {
95            switch(msg.what) {
96                case SHOW_TOAST:
97                    handleShowToast(msg.arg1);
98                    break;
99            }
100        }
101    }
102}
103