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.os.PowerManager.WakeLock; 22 import android.util.Log; 23 24 /** 25 * Manage wakelocks that are used by Cell broadcast receiver various services. 26 */ 27 class CellBroadcastAlertWakeLock { 28 private static final String TAG = "CellBroadcastAlertWakeLock"; 29 30 private static final long MAX_PARTIAL_WAKELOCK_DURATION = 1000; // 1 sec 31 private static final long MAX_SCREEN_BRIGHT_WAKELOCK_DURATION = 1000 * 60 * 5; // 5 minutes 32 33 private static WakeLock sPartialWakeLock; 34 private static WakeLock sScreenBrightWakeLock; 35 36 private CellBroadcastAlertWakeLock() {} 37 38 static void acquirePartialWakeLock(Context context) { 39 // Make sure we don't acquire the partial lock for more than 1 second. This lock 40 // is currently used to make sure the alert reminder tone and vibration could be played 41 // properly in timely manner. 42 acquirePartialWakeLock(context, MAX_PARTIAL_WAKELOCK_DURATION); 43 } 44 45 static void acquirePartialWakeLock(Context context, long timeout) { 46 if (sPartialWakeLock == null) { 47 PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 48 sPartialWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); 49 } 50 51 if (!sPartialWakeLock.isHeld()) { 52 sPartialWakeLock.acquire(timeout); 53 Log.d(TAG, "acquired partial wakelock"); 54 } 55 } 56 57 static void releasePartialWakeLock() { 58 if (sPartialWakeLock != null && sPartialWakeLock.isHeld()) { 59 sPartialWakeLock.release(); 60 Log.d(TAG, "released partial wakelock"); 61 } 62 } 63 64 static void acquireScreenBrightWakeLock(Context context) { 65 // Make sure we don't acquire the full lock for more than 5 minutes. This lock 66 // is currently used by the main alert tone playing. Normally we hold the lock while 67 // the audio is playing for about 10 ~ 20 seconds. 68 acquireScreenBrightWakeLock(context, MAX_SCREEN_BRIGHT_WAKELOCK_DURATION); 69 } 70 71 static void acquireScreenBrightWakeLock(Context context, long timeout) { 72 if (sScreenBrightWakeLock == null) { 73 PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 74 sScreenBrightWakeLock = pm.newWakeLock( 75 PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ON_AFTER_RELEASE, TAG); 76 } 77 78 if (!sScreenBrightWakeLock.isHeld()) { 79 sScreenBrightWakeLock.acquire(timeout); 80 Log.d(TAG, "acquired screen bright wakelock"); 81 } 82 } 83 84 static void releaseScreenBrightWakeLock() { 85 if (sScreenBrightWakeLock != null && sScreenBrightWakeLock.isHeld()) { 86 sScreenBrightWakeLock.release(); 87 Log.d(TAG, "released screen bright wakelock"); 88 } 89 } 90 } 91
