Add mbtiles tilesource in vtm-android

[hanchao]

Test Code

        MBTileSource tileSource = new MBTileSource();
        tileSource.setFile("/sdcard/mutumapapi/maptest_30c930.mbtiles");
        tileSource.open();
        MapRenderer.setBackgroundColor(0xff777777);
        map.layers().add(new TileGridLayer(map, Color.GRAY, 1.8f, 8));


        BitmapTileLayer bitmapLayer = new BitmapTileLayer(map, tileSource);
        map.layers().add(bitmapLayer);

[hjanetzek]

Hi,
thanks for the patch. I think support for pre-compiled bitmap packages is a good addition - however the implementation could mature a bit before merging into master. Could you add a simple example mbtiles file for testing? I havent looked at the spec yet - I guess there are some more tile coordinate options to be supported.

I've pushed my modifcations to add_mbtiles_tilesources branch.
For formatting there is a IDEA plugin wich can use the provided eclipse-formatter.xml.