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      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 
     17 package com.android.cellbroadcastreceiver;
     18 
     19 import android.content.Context;
     20 import android.os.PowerManager;
     21 
     22 /**
     23  * Hold a wakelock while showing the alert dialog and playing sound.
     24  */
     25 class 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