哪里可以找到默认的android的谷歌地图标记和默认气球代码？

private void addMarker(LatLng position) {
    MarkerOptions markerOptions = new MarkerOptions();
    markerOptions.position(position);
    markerOptions.title("默认标记");
    markerOptions.snippet("这是一个默认的标记");
    mMap.addMarker(markerOptions);
}

private void addInfoWindow(LatLng position) {
    View infoWindowView = getLayoutInflater().inflate(R.layout.info_window_layout, null);
    TextView titleView = infoWindowView.findViewById(R.id.title);
    TextView snippetView = infoWindowView.findViewById(R.id.snippet);
    titleView.setText("默认气球标题");
    snippetView.setText("这是一个默认的气球");
    mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {
        @Override
        public View getInfoWindow(Marker marker) {
            return infoWindowView;
        }
        @Override
        public View getInfoContents(Marker marker) {
            return null;
        }
    });
    mMap.addMarker(new MarkerOptions().position(position).title("默认标记").snippet("这是一个默认的标记"));
}