Inner class created yet error

// some methods omitted
public class MainActivity extends Activity {
    Boolean isBound = false;
    Messenger mServiceMessenger;
  Messenger mActivityMessenger=new Messenger(new ActivityHandler(this));
    private int latitude;
  private int longitude;

  class ActivityHandler extends Handler{
  private MainActivity mMainActivity;
   public ActivityHandler(MainActivity mainActivity){
    mMainActivity =mainActivity;
    }

  @Override
  public void handleMessage(Message msg){
  latitude=msg.arg1;
  longitude=msg.arg2;
    mMainActivity.setCoordinates(latitude,longitude);
  }
  }


    ServiceConnection mServiceConnection = new ServiceConnection() {
      @Override  
      public void onServiceConnected(ComponentName name, IBinder binder) {
        isBound = true;
        mServiceMessenger=new Messenger(binder);
        Message message=Message.obtain();
        message.replyTo=mActivityMessenger;
        try{
        mServiceMessenger.send(message);
        }
        catch(Exception e){
        e.printStackTrace();
      }
      }

      @Override
      public void onServiceDisconnected(ComponentName name) {
        isBound = false;
      }
    };
}

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

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

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

        }
        catch(Exception e){
        e.printStackTrace();
        }
      }
    }
}

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