я пытаюсь найти свое местоположение на карте Google. Мой код здесь. Я запустил приложение в своем телефоне, но, к сожалению, оно остановилось. Есть идеи о том, в чем может быть проблема? Благодарю.

  public class MainActivity extends Activity implements LocationListener {

    private LatLng loc ;
    private LocationManager locationManager;
    private String provider;

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState){
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

      Criteria criteria = new Criteria();
      provider = locationManager.getBestProvider(criteria, false);
      Location location = locationManager.getLastKnownLocation(provider);

      if (location != null) {
        onLocationChanged(location);
      }

      GoogleMap map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
      map.addMarker(new MarkerOptions().position(loc).title("Istanbul"));
      map.moveCamera(CameraUpdateFactory.newLatLngZoom(loc, 15));
      map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
    }

    @Override
    public void onLocationChanged(Location location) {
        double lat = (double) (location.getLatitude());
        double lng = (double) (location.getLongitude());
        loc = new LatLng(lat,lng);
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    protected void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    @Override
    protected void onPause() {

        super.onPause();
        locationManager.removeUpdates(this);
    }
  }