Osm地圖osmdroid下載離線地圖，第三方瓦片地圖

final MapTileProviderBasic tileProvider = new MapTileProviderBasic(getContext().getApplicationContext()); 若是要自定義瓦片數據源，新建一個類實現ITileSource，替換下面這句便可javascript final ITileSource tileSource = new XYTileSou

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