AlarmAlertWakeLock.java revision df77f79bbf931894d91cd0d8334f204ff67e903a 
1/*
2 * Copyright (C) 2008 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.deskclock;
18
19import android.content.Context;
20import android.os.PowerManager;
21
22/**
23 * Hold a wakelock that can be acquired in the AlarmReceiver and
24 * released in the AlarmAlert activity
25 */
26class AlarmAlertWakeLock {
27
28    private static PowerManager.WakeLock sCpuWakeLock;
29
30    static PowerManager.WakeLock createPartialWakeLock(Context context) {
31        PowerManager pm =
32                (PowerManager) context.getSystemService(Context.POWER_SERVICE);
33        return pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, Log.LOGTAG);
34    }
35
36    static void acquireCpuWakeLock(Context context) {
37        if (sCpuWakeLock != null) {
38            return;
39        }
40
41        sCpuWakeLock = createPartialWakeLock(context);
42        sCpuWakeLock.acquire();
43    }
44
45    static void releaseCpuLock() {
46        if (sCpuWakeLock != null) {
47            sCpuWakeLock.release();
48            sCpuWakeLock = null;
49        }
50    }
51}
52