aktuelle Position bestimmten GPS

public class GPS extends MapActivity implements LocationListener {
    
    TextView myLoc = null;
    MapView myMap = null;
    double lat = 0;
    double lng = 0;
    GeoPoint geoPoint = null;
    MapController mapController = null;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        myLoc = (TextView)findViewById(R.id.Ausgabe);
        
        myLoc.setText("Lat: " + lat + " Long: " + lng);
        
        myMap = (MapView) findViewById(R.id.myMap);
        geoPoint = new GeoPoint((int) lat * 1000000, (int) lng * 1000000);
        myMap.setSatellite(false);
        
        //Getting the MapController
        mapController = myMap.getController();
        mapController.setCenter(geoPoint);
        mapController.setZoom(15);
        
        //get Overlay
        MyLocationOverlay myLocationOverlay = new MyLocationOverlay();
        List<Overlay> list = myMap.getOverlays();
        list.add(myLocationOverlay);
        
        //Adding zoom controls
        myMap.setBuiltInZoomControls(true);
        myMap.displayZoomControls(true);
        
        LocationManager locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500l, 0, this);
        
        
    }

    @Override
    public void onLocationChanged(Location location) {
        if(location != null) {
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            
            myLoc.setText("Lat: " + lat + " Long: " + lng);
             
            geoPoint = new GeoPoint((int) lat * 1000000, (int) lng * 1000000);
            mapController.animateTo(geoPoint);
                
            Context context = getApplicationContext();
            CharSequence text = "Lat: " + lat + " Long: " + lng;
             
            Toast toast = Toast.makeText(context, text, 5);
            toast.show();
        }
        
    }

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

    @Override
    public void onProviderEnabled(String arg0) {
    }

    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        // TODO Auto-generated method stub
    }
    
    protected class MyLocationOverlay extends com.google.android.maps.Overlay {
        
        @Override
        public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
            Paint paint = new Paint();
            
            super.draw(canvas, mapView, shadow);
            // Converts lat/lng-Point to OUR coordinates on the screen.
            Point myScreenCoords = new Point();
            mapView.getProjection().toPixels(geoPoint, myScreenCoords);
            
            paint.setStrokeWidth(1);
            paint.setARGB(255, 255, 255, 255);
            paint.setStyle(Paint.Style.STROKE);
            
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.marker);
            
            canvas.drawBitmap(bmp, myScreenCoords.x, myScreenCoords.y, paint);
            canvas.drawText("Das bist du ...", myScreenCoords.x, myScreenCoords.y, paint);
            return true;
        }
    }

    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }
}