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 CellBroadcastAlertWakeLock()29 private CellBroadcastAlertWakeLock() {} 30 acquireCpuWakeLock(Context context)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 releaseCpuLock()46 static void releaseCpuLock() { 47 if (sCpuWakeLock != null) { 48 sCpuWakeLock.release(); 49 sCpuWakeLock = null; 50 } 51 } 52 } 53