1/*
2 * Copyright (C) 2011 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.cellbroadcastreceiver;
18
19import android.content.Context;
20import android.os.PowerManager;
21
22/**
23 * Hold a wakelock while showing the alert dialog and playing sound.
24 */
25class CellBroadcastAlertWakeLock {
26
27    private static PowerManager.WakeLock sCpuWakeLock;
28
29    private CellBroadcastAlertWakeLock() {}
30
31    static void acquireCpuWakeLock(Context context) {
32        if (sCpuWakeLock != null) {
33            return;
34        }
35
36        PowerManager pm =
37                (PowerManager) context.getSystemService(Context.POWER_SERVICE);
38
39        sCpuWakeLock = pm.newWakeLock(
40                PowerManager.PARTIAL_WAKE_LOCK |
41                PowerManager.ACQUIRE_CAUSES_WAKEUP |
42                PowerManager.ON_AFTER_RELEASE, "CellBroadcastAlertWakeLock");
43        sCpuWakeLock.acquire();
44    }
45
46    static void releaseCpuLock() {
47        if (sCpuWakeLock != null) {
48            sCpuWakeLock.release();
49            sCpuWakeLock = null;
50        }
51    }
52}
53