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 32 private CellBroadcastAlertWakeLock() {} 33 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 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
