如何在监控信标的同时获取UUID？

我正在使用altbeacon参考应用程序来处理信标 . 当我尝试打印arg0时我得到null我在监视信标时得到null .

@Override
 public void didEnterRegion(Region arg0) {
    // In this example, this class sends a notification to the user 
 whenever a Beacon
    // matching a Region (defined above) are first seen.
    System.out.println(arg0);
    System.out.println(arg0.getUniqueId());
    System.out.println(arg0.getId1());
    Log.d(TAG, "did enter region.");
}

我如何在这里获得UUID？是否有必要在这里调用范围，因为我正在尝试制作前台服务，如果我每次收到一个didEnter事件时都调用测距服务，它不会很重并被android系统杀死 . 我以前尝试这样做并将结果存储在一个集合中，看看该区域是否有新的信标，然后将其添加到那里，但导致服务被杀死 .

Edit: 我尝试了以下方法

@Override
  public void didEnterRegion(Region arg0) {
    if (!haveDetectedBeaconsSinceBoot) {
        Log.d(TAG, "auto launching MainActivity");
        Intent RangingIntent = new Intent(this, Monitoring.class);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
         getApplicationContext().startForegroundService(RangingIntent);
        } else  {
            getApplicationContext().startService(RangingIntent);
        }
        haveDetectedBeaconsSinceBoot = true;
        } else {
        if (monitoringActivity != null) {
            Intent RangingIntent = new Intent(this, Monitoring.class);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {               
         getApplicationContext().startForegroundService(RangingIntent);
            } else  {
                getApplicationContext().startService(RangingIntent);
            }
        }
    }

测距代码

public class Monitoring extends Service implements BeaconConsumer {

        protected static final String TAG = "RangingService";
        private BeaconManager beaconManager = BeaconManager.getInstanceForApplication(this);

        @Nullable
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }

        public void onCreate() {
            super.onCreate();
            System.out.println("********STARTING RANGING*********");
            beaconManager.bind(this);
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            beaconManager.unbind(this);
        }

        @Override
        public void onBeaconServiceConnect() {
            beaconManager.setRangeNotifier(new RangeNotifier()  {
                @Override
                public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
                    if (beacons.size() > 0) {
                        Log.d(TAG, "didRangeBeaconsInRegion called with beacon count:  "+beacons.size());
                        Log.d(TAG, String.valueOf(beacons.iterator().next()));
                        Beacon firstBeacon = beacons.iterator().next();
                    }
                }

            });

            try {
                beaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
            } catch (RemoteException e) {   }
        }
    }

PS：Iam试图在应用程序被杀时获取测距日志