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