Android AlarmManager实现定时循环后台任务

/**
 * 一个定时任务
 */

public class AlarmService extends Service {

  /**
   * 每1分钟更新一次数据
   */
  private static final int ONE_Miniute=60*1000;
  private static final int PENDING_REQUEST=0;

  public AlarmService() {
  }

  /**
   * 调用Service都会执行到该方法
   */
  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {

    //这里模拟后台操作
    new Thread(new Runnable() {
      @Override
      public void run() {
        Log.e("wj","循环执行了，哈哈."+ System.currentTimeMillis());
      }
    }).start();

    //通过AlarmManager定时启动广播
    AlarmManager alarmManager= (AlarmManager) getSystemService(ALARM_SERVICE);
    long triggerAtTime=SystemClock.elapsedRealtime()+ONE_Miniute;//从开机到现在的毫秒书（手机睡眠(sleep)的时间也包括在内
    Intent i=new Intent(this, AlarmReceive.class);
    PendingIntent pIntent=PendingIntent.getBroadcast(this,PENDING_REQUEST,i,PENDING_REQUEST);
    alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,triggerAtTime,pIntent);

    return super.onStartCommand(intent, flags, startId);
  }

  @Override
  public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
  }
}

public class AlarmReceive extends BroadcastReceiver{
  @Override
  public void onReceive(Context context, Intent intent) {
    //循环启动Service
    Intent i = new Intent(context, AlarmService.class);
    context.startService(i);
  }
}

public void startService(View view){
    Intent intent=new Intent(this, AlarmService.class);
    startService(intent);
  }

<service
  android:name=".service.AlarmService"
  android:enabled="true"
  android:exported="true"/>
<receiver android:name=".receive.AlarmReceive"/>