Yandex Maps Provider for codenameone // tileFor() not working correctly

YandexMapsProvider.java

import com.codename1.maps.*;
import com.codename1.maps.providers.TiledProvider;
import com.codename1.ui.geom.Dimension;

//TODO: fix tileFor() 

public class YandexMapsProvider extends TiledProvider {

    /**
     * @return the tileSize
     */
    public static int getTileSize() {
        return tileSize;
    }

    /**
     * @param aTileSize the tileSize to set
     */
    public static void setTileSize(int aTileSize) {
        tileSize = aTileSize;
    }

    private int type;

    private String language = "en-US";

    private static int tileSize = 450;

    /**
     * This is a regular road map
     */
    public static final int REGULAR = 0;

    /**
     * This is a satellite map
     */
    public static final int SATELLITE = 1;

    /**
     * This is a satellite + road map
     */
    public static final int HYBRID = 2;

    /**
     * Yandex maps provider Constructor
     */
    public YandexMapsProvider() {
        super("https://static-maps.yandex.ru/1.x/?", new Mercator(), new Dimension(tileSize, tileSize));
    }


    /**
     * Sets the map type
     */
    public void setMapType(int type) {
        this.type = type;
    }


    /**
     * {@inheritDoc}
     */
    public int maxZoomLevel() {
        return 17;
    }

    /**
     * {@inheritDoc}
     */
    public String attribution() {
        return "Yandex";
    }

    /**
     * {@inheritDoc}
     */
    public Tile tileFor(BoundingBox bbox) {
        StringBuilder sb = new StringBuilder(_url);
        Coord ne = bbox.getNorthEast();
        Coord c = projection().toWGS84(new Coord(ne.getLatitude() - bbox.latitudeDifference() / 2,
                ne.getLongitude() - bbox.longitudeDifference() / 2, true));

        sb.append("ll=");
        sb.append(c.getLatitude());
        sb.append(",");
        sb.append(c.getLongitude());
        sb.append("&z=" + _zoomLevel);
        sb.append("&size=");
        sb.append(tileSize);
        sb.append(",");
        sb.append(tileSize);

        sb.append("&lang=");
        sb.append(language);

        if (type == REGULAR) {
            sb.append("&l=map");
        } else if (type == SATELLITE) {
            sb.append("&l=sat");
        } else if (type == HYBRID) {
            sb.append("&l=sat,skl");
        }


        return new ProxyHttpTile(tileSize(), bbox, sb.toString());
    }

    /**
     * Defines the language to use for display of labels on map tiles.
     * Note that this parameter is only supported for some country tiles;
     * if the specific language requested is not supported for the tile set,
     * then the default language for that tileset will be used.
     *
     * Should be the form "language_region"
     * language — Two-letter language code. Specified in ISO 639-1 format.
     * region — Two-letter country code. Specified in ISO 3166-1 format. Determines regional settings such as measurement units.
     *
     * Doc: https://tech.yandex.com/maps/doc/staticapi/1.x/dg/concepts/input_params-docpage/
     *
     * @return the language
     */
    public String getLanguage() {
        return language;
    }

    /**
     * Defines the language to use for display of labels on map tiles.
     * Note that this parameter is only supported for some country tiles;
     * if the specific language requested is not supported for the tile set,
     * then the default language for that tileset will be used.
     *
     * Should be the form "language_region"
     * language — Two-letter language code. Specified in ISO 639-1 format.
     * region — Two-letter country code. Specified in ISO 3166-1 format. Determines regional settings such as measurement units.
     *
     * Doc: https://tech.yandex.com/maps/doc/staticapi/1.x/dg/concepts/input_params-docpage/
     *
     * @param language the language to set
     */
    public void setLanguage(String language) {
        this.language = language;
    }


}