Osm地图osmdroid下载离线地图，第三方瓦片地图

final MapTileProviderBasic tileProvider = new MapTileProviderBasic(getContext().getApplicationContext()); 若是要自定义瓦片数据源，新建一个类实现ITileSource，替换下面这句便可javascript final ITileSource tileSource = new XYTileSou

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