geopackage-sdk/src/main/java/mil/nga/geopackage/tiles/UrlTileGenerator.java
private String replaceXYZ(String url, int z, long x, long y) {

        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_z),
                String.valueOf(z));
        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_x),
                String.valueOf(x));
        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_y),
                String.valueOf(y));
        return url;
    }
private String replaceXYZ(String url, int z, long x, long y) {

        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_z),
                String.valueOf(z));
        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_x),
                String.valueOf(x));
        url = url.replaceAll(
                context.getString(R.string.tile_generator_variable_y),
                String.valueOf(y));
        return url;
    }
Replace x, y, and z in the url

@param url
@param z
@param x
@param y
@return