i cant understand the question please tell me the answer for this question please help

// some methods omitted
public class MainActivity extends Activity {
    Boolean isBound = false;
    Messenger mServiceMessenger;
    Messenger mActivityMessenger=new Messenger(new ActivityHandler(this));
    ServiceConnection mServiceConnection = new ServiceConnection() {
      @Override  
      public void onServiceConnected(ComponentName name, IBinder binder) {
        mServiceMessenger=new Messenger(binder);
        Message message=Message.obtain();
        message.replyTo=mActivityMessenger;
        mServiceMessenger.send(message);
      }

      @Override
      public void onServiceDisconnected(ComponentName name) {
        isBound = false;
      }
    };
    public class ActivityHandler extends Handler{
      MainActivity mMainActivity;
      public ActivityHandler(MainActivity mainActivity){
        mMainActivity=mainActivity;
      }

        public void handleMessage(Message msg){
        mMainActivity.setCoordinates(msg.arg1,msg.arg2);
      }
    }
}

// some methods omitted
public class GeolocationService extends Service {
    int mLatitude;
    int mLongitude;
    Messenger mMessenger = new Messenger(new LocationHandler(this));

    @Override
    public IBinder onBind(Intent intent) {
      return mMessenger.getBinder();
    }

   class LocationHandler extends Handler {
     GeolocationService mGeolocationService;
     public LocationHandler(GeolocationService geolocationService){
        mGeolocationService=geolocationService;
     }
      @Override
      public void handleMessage(Message msg) {
        mLatitude = getLatitude();
        mLongitude = getLongitude();
        Message message=Message.obtain();
        message.arg1=mLatitude;
        message.arg2=mLongitude;
        message.replyTo=mGeolocationService.mMessenger;
        msg.replyTo.send(message);
        }
      }
    }
}

  public class Difficulty {
    public static Boolean HARDMODE = false;    
  }