LayerGoogleSat.java

package org.pyneo.tabulae.map;

import java.net.MalformedURLException;
import java.net.URL;
import org.mapsforge.core.model.Tile;
import org.mapsforge.map.android.graphics.AndroidGraphicFactory;
import org.mapsforge.map.android.view.MapView;
import org.mapsforge.map.layer.download.TileDownloadLayer;
import org.mapsforge.map.layer.download.tilesource.OnlineTileSource;
import org.pyneo.tabulae.Tabulae;

/**
 * Google satellite based layer
 */
class LayerGoogleSat extends LayerBase {
	static final String ID = "google_sat";
	static final String strGalileo = "Galileo";

	LayerGoogleSat(Tabulae activity, MapView mapView) {
		super(activity, mapView, true);
		tileLayer = new TileDownloadLayer(tileCache, mapView.getModel().mapViewPosition,
				new Source(), AndroidGraphicFactory.INSTANCE);
		mapView.getLayerManager().getLayers().add(0, tileLayer);
		setVisible(false);
	}

	String getId() {
		return ID;
	}

	byte getZoomLevelMax() {
		return (byte) 18;
	}

	static class Source extends OnlineTileSource {
		Source() {
			super(new String[]{"khms%d.google.com",}, 80);
			setAlpha(false);
			setBaseUrl("/kh/v=140");
			setExtension("png");
			setName(ID);
			setParallelRequestsLimit(8);
			setProtocol("http");
			setTileSize(256);
			setZoomLevelMax(getZoomLevelMax());
			setZoomLevelMin(getZoomLevelMin());
		}

		@Override
		public URL getTileUrl(Tile tile) throws MalformedURLException {
			int servernum = (tile.tileX + 2 * tile.tileY) % 4;
			return new URL(getProtocol(), String.format(getHostName(), servernum), port, getBaseUrl() +
					"&hl=" + "en" +
					"&src=" + "app" +
					"&x=" + tile.tileX +
					"&y=" + tile.tileY +
					"&z=" + tile.zoomLevel +
					"&scale=" + true +
					"&s=" + strGalileo.substring(0, (tile.tileX * 3 + tile.tileY) % 8)
			);
		}
	}
}