Help initializing ServiceConnection

public class GeolocationService extends Service {

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

    //Client methods
    public int getLatitude() { return getLat(); }    
    public int getLongitude() { return getLng(); }
}

public class MainActivity extends Activity {
  int latitude;
  int longitude;
  private boolean mBound = false;

  private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mBound = true;
        }
        @Override
        public void onServiceDisconnected(ComponentName name) {
            mBound = false;
        }
    };

  @Override
  public void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);

    Button updateLocationButton = (Button) findViewById(R.id.update_button);
    updateLocationButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v){

      }
    });
  }

  @Override
    public void onStart() {
        super.onStart();
        Intent intent = new Intent(this, GeolocationService.class);
        bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
    }

  @Override
    public void onStop() {
        super.onStop();
        if (mBound) {
            unbindService(serviceConnection);
            mBound = false;
        }
    }

}