1 /*
2  * Copyright (C) 2012 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 
17 package com.android.cellbroadcastreceiver;
18 
19 import android.content.Context;
20 import android.os.PowerManager;
21 import android.util.Log;
22 
23 /**
24  * Hold a wakelock that can be acquired in the CellBroadcastAlertService and
25  * released in the CellBroadcastAlertFullScreen Activity.
26  */
27 class CellBroadcastAlertWakeLock {
28     private static final String TAG = "CellBroadcastAlertWakeLock";
29 
30     private static PowerManager.WakeLock sCpuWakeLock;
31 
CellBroadcastAlertWakeLock()32     private CellBroadcastAlertWakeLock() {}
33 
acquireScreenCpuWakeLock(Context context)34     static void acquireScreenCpuWakeLock(Context context) {
35         if (sCpuWakeLock != null) {
36             return;
37         }
38         PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
39         sCpuWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK
40                 | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, TAG);
41         sCpuWakeLock.acquire();
42         Log.d(TAG, "acquired screen + CPU wake lock");
43     }
44 
releaseCpuLock()45     static void releaseCpuLock() {
46         if (sCpuWakeLock != null) {
47             sCpuWakeLock.release();
48             sCpuWakeLock = null;
49             Log.d(TAG, "released screen + CPU wake lock");
50         }
51     }
52 }
53