Estoy tratando de encontrar mi ubicación en Google Map. Mi código está aquí. He ejecutado mi aplicación en mi teléfono, pero lamentablemente se detuvo. ¿Alguna idea sobre cuál puede ser el problema? Gracias.

  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);
    }
  }