CustomView in MapView darstellen

public class LocationMapView extends MapView {
           [...]
    public void setLocationMarker(GeoPoint point) {
            this.getOverlays().clear();
            OverlayItem overlayitem = new OverlayItem(point, "It's me", "I'm Here!");
            Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
            locOverlay = new LocationOverlay(drawable, this.getContext());
            locOverlay.addOverlay(overlayitem);
            this.getOverlays().add(locOverlay);
            this.getController().animateTo(point);
            this.getController().setCenter(point);
    }
}

public class LocationOverlay extends ItemizedOverlay {
    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    private Context mContext;
    
    public LocationOverlay(Drawable defaultMarker, Context context) {
        super(boundCenterBottom(defaultMarker));
        mContext = context;
    }

    @Override
    protected boolean onTap(int index) {
        OverlayItem item = mOverlays.get(index);
        AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
        dialog.setTitle(item.getTitle());
        dialog.setMessage(item.getSnippet());
        dialog.show();
        return true;
    }

    @Override
    protected OverlayItem createItem(int idx) {
        return mOverlays.get(idx);
    }

    @Override
    public int size() {
        return mOverlays.size();
    }

    public void addOverlay(OverlayItem overlay) {
        mOverlays.add(overlay);
        populate();
    }
}