android保活,有效的代码保活

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需要APP暗屏情况下进行后台执行一些任务,但是google现在为了优化手机的体验,以及流畅性,做了很多的限制,电量优化,休眠模式,以及进入深度睡眠状态,进入深入休眠状态系统会根据黑白名单的应用进行管理,杀掉非白名单的后台进程以及网络请求;Android系统的优化是守护后台进程造成了很大困扰,线程之间守护已经是不在可靠,使用wakelock耗电过大也会是系统杀掉应用进程。下面就对我们的经历说说守护进程的。

1,从官网上可以看出google为了系统更加流畅以及优化内存,Google做了很大的处理,在手机暗屏或者睡眠状态就停止后台运行;若要保持service的常驻,需要做一些前端的活动,Notification重要属性:notification.flags = Notification.FLAG_NO_CLEAR|Notification.FLAG_ONGOING_EVENT;然后startForeground(setClass().hashCode(), notification);使得服务能挂在通知栏。

2,通过wakelock占用CPU,若一直占用CPU的话,当然这是比较耗电的,要是耗电太高的话系统会直接回收,杀死程序进程。

我是使用定时器唤醒cpu 后台服务将接收到定时任务执行未完成的任务:下面是我实现的代码

在mainfest中注册

关键代码定时任务:

publicvoidstartAlarm(Context context){      
Intent intent =newIntent(context, WakeCPUAlarmReceiver.class);      
alarmIntent = PendingIntent.getBroadcast(context,0, intent,0);      
alarmMgr = (AlarmManager) context .getSystemService(Context.ALARM_SERVICE);//    alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,//          1000, alarmIntent);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {   
     alarmMgr.setExactAndAllowWhileIdle(       
       AlarmManager.ELAPSED_REALTIME_WAKEUP,        
      SystemClock.elapsedRealtime() + chekcTime, alarmIntent);    
  }else if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {  
      alarmMgr.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP,              SystemClock.elapsedRealtime() + chekcTime, alarmIntent);    
  }else{      
  alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,             
 SystemClock.elapsedRealtime() + chekcTime, alarmIntent);    
  }     
 FileLogUtil.e(TAG ,"startAlarm 设置定时任务");  }

接收到定时任务:

publicclassWakeCPUAlarmReceiverextendsWakefulBroadcastReceiver{
privateAlarmManageralarmMgr;
privatePendingIntentalarmIntent;
privatefinallong chekcTime =30*1000;    
public static boolean isCheckFlag =false;
privatestaticStringTAG=WakeCPUAlarmReceiver.class.getSimpleName();
@Override
public void onReceive(Contextcontext,Intentintent) {
// TODO Auto-generated method stub
Intentservice =newIntent(context,WakecpuIntentService.class);
FileLogUtil.e(TAG,"onReceive 接收定时任务");          
startWakefulService(context, service);  
}

在service中执行需要执行的任务:

public class WakecpuIntentService extends IntentService{
private static String TAG=WakecpuIntentService.class.getSimpleName() +" :";
private NotificationManager mNotificationManager;
private PowerManager.WakeLockwl;
NotificationCompat.Builderbuilder;  
public WakecpuIntentService() {
super("WakecpuIntentService");
// TODO Auto-generated constructor stub
}
@Override
protected void onHandleIntent(Intentintent) {
// TODO Auto-generated method stubBundle
extras = intent.getExtras();
FileLogUtil.e(TAG,"Service接收到WakeLock定时任务。");
PollService.startService(getApplicationContext());
FileLogUtil.e(TAG,"Service接收到WakeLock定时任务在定时任务中启动轮询Service。");
// Do the work that requires your app to keep the CPU running.
// Release the wake lock provided by the WakefulBroadcastReceiver.
//checkScreenOff();
WakeCPUAlarmReceiver.completeWakefulIntent(intent);//释放wake
WakeCPUAlarmReceiver.setCheckFlag(false);
WakeCPUAlarmReceivermAlarmReceiver =newWakeCPUAlarmReceiver();      
mAlarmReceiver.startAlarm(WakecpuIntentService.this);
FileLogUtil.e(TAG,"Service释放wakelock后设置定时任务。");  
    }
}

service在后台也能够打印log 保持一直执行,最重要的是不耗电也不会卡机的问题。欢迎大家一起讨论学习。 关注公众号获取更多干货 android保活,有效的代码保活

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