1、前言

http://mt2.google.cn/vt/lyrs=m@225000000&hl=zh-CN&gl=cn&x=420&y=193&z=9&s=Galil

通过图层扩展类的方式加载Google地图的是我们通常获取Google地图的一种方式，根据这种方式我们可以通过拼接地图瓦片Url字符串获取瓦片数据，关于Google瓦片算法的解析网上有很多，以下仅列出博客地址，及具体实现类。

 ：http://blog.csdn.net/hugoandpig/article/details/7719307

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2、Google地图的自定义扩展类

package com.seraph.collect.BaseComp.MapLayer;import java.util.Map;import java.util.concurrent.RejectedExecutionException;import android.util.Log;import com.esri.android.map.TiledServiceLayer;import com.esri.core.geometry.Envelope;import com.esri.core.geometry.Point;import com.esri.core.geometry.SpatialReference;/** *Google地图加载 */public class GoogleMapLayer extends TiledServiceLayer {    private int minLevel = 0;    private int maxLevel = 19;    private String[] subDomains = new String[] { "mt1", "mt2", "mt3" };    private double[] scales = new double[] { 591657527.591555,            295828763.79577702, 147914381.89788899, 73957190.948944002,            36978595.474472001, 18489297.737236001, 9244648.8686180003,            4622324.4343090001, 2311162.217155, 1155581.108577, 577790.554289,            288895.277144, 144447.638572, 72223.819286, 36111.909643,            18055.954822, 9027.9774109999998, 4513.9887049999998, 2256.994353,            1128.4971760000001 };    private double[] resolutions = new double[] { 156543.03392800014,            78271.516963999937, 39135.758482000092, 19567.879240999919,            9783.9396204999593, 4891.9698102499797, 2445.9849051249898,            1222.9924525624949, 611.49622628138, 305.748113140558,            152.874056570411, 76.4370282850732, 38.2185141425366,            19.1092570712683, 9.55462853563415, 4.7773142679493699,            2.3886571339746849, 1.1943285668550503, 0.59716428355981721,            0.29858214164761665 };    private Point origin = new Point(-20037508.342787, 20037508.342787);    private int dpi = 96;    private int tileWidth = 256;    private int tileHeight = 256;    public GoogleMapLayer() {        super(true);        this.init();    }    private void init() {        try {            getServiceExecutor().submit(new Runnable() {                public void run() {                    GoogleMapLayer.this.initLayer();                }            });        } catch (RejectedExecutionException rejectedexecutionexception) {            Log.e("Google Map Layer", "initialization of the layer failed.",                    rejectedexecutionexception);        }    }    protected byte[] getTile(int level, int col, int row) throws Exception {        if (level > maxLevel || level < minLevel)            return new byte[0];        String subDomain = subDomains[(level + col + row) % subDomains.length];　　　　 　　　　　//构建待拼接字符串 　　　　　String _mapType = "m@225000000";        String url = "http://" + subDomain                + ".google.cn/vt/lyrs=" + _mapType + "&hl=zh-CN&gl=CN&src=app&" + "x=" + col + "&" + "y=" + row + "&" + "z=" + level + "&s=Ga";        Map
     
       map = null;        return com.esri.core.internal.io.handler.a.a(url, map);    }    protected void initLayer() {        if (getID() == 0L) {            nativeHandle = create();            changeStatus(com.esri.android.map.event.OnStatusChangedListener.STATUS                    .fromInt(-1000));        } else {            this.setDefaultSpatialReference(SpatialReference.create(102113));            this.setFullExtent(new Envelope(-22041257.773878,                    -32673939.6727517, 22041257.773878, 20851350.0432886));            this.setTileInfo(new TileInfo(origin, scales, resolutions,                    scales.length, dpi, tileWidth, tileHeight));            super.initLayer();        }    }}