如何保存谷歌地图在android系统？以及如何使用tileprovider [英] How to save google map in android ?and How to use tileprovider

问题描述

我使用互联网创建一个Android的谷歌地图，但我不知道如何保存谷歌地图在一个Android应用程序。结果
例如：Android地图应用。

I am creating an Android Google map using internet, but I don't know how to save Google map in an Android app.
Example: Android Maps App.

请帮我

推荐答案

从不同的来源你可以蛴螬瓷砖。这是实现TileProvider的您可以与GoogleMap的使用哪个抢GoogleMapTiles

You can grub tiles from different sources. This is implementation of TileProvider which you can use with googleMap which grab GoogleMapTiles

   public class GoogleMapOfflineTileProvider implements TileProvider
    {

        private static final String UPPER_ZOOM_TILE_URL;


        static
        {

            UPPER_ZOOM_TILE_URL = "http://mt0.google.com/vt/lyrs=m&hl=ru&x=%d&y=%d&z=%d&scale=1&s=Galileo";
        }


        private static final String TAG = GoogleMapOfflineTileProvider.class.getName();

        private SQLiteMapDatabase sqLiteMapDatabase;


        public GoogleMapOfflineTileProvider(File file)
        {
            this(file.getAbsolutePath());
        }


        public GoogleMapOfflineTileProvider(String pathToFile)
        {
            sqLiteMapDatabase = new SQLiteMapDatabase();
            sqLiteMapDatabase.setFile(new File(pathToFile));
        }


        @Override
        public Tile getTile(int x, int y, int z)
        {
            Tile tile = NO_TILE;

                if ( sqLiteMapDatabase.existsTile(x, y, z) )
                {
                    tile = new Tile(256, 256, sqLiteMapDatabase.getTile(x, y, z));
                }
                else if ( z < 11 )
                {
                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    getBitmapFromURL(x, y, z).compress(Bitmap.CompressFormat.JPEG, 100, stream);
                    tile = new Tile(256, 256, stream.toByteArray());
                }

            return tile;
        }


    public static Bitmap getBitmapFromURL(int x, int y, int z)
    {
        Log.d(TAG, String.format(UPPER_ZOOM_TILE_URL, x, y, z));
        try
        {
            URL url = new URL(String.format(UPPER_ZOOM_TILE_URL, x, y, z));
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            return BitmapFactory.decodeStream(connection.getInputStream());
        }
        catch (IOException e)
        {
            Log.d(TAG, "exception when retrieving bitmap from internet" + e.toString());
            return null;
        }
    }
}

这样你就可以缓存切片到你的数据库中的x / y和缩放。或者你也可以保存特定区域。而就后重新使用它们。将其设置为谷歌地图使用：

so you can cache tiles into your database by x/y and zoom. Or you can save specific area. And after just reuse them. To set it for google maps use:

tileProvider = new GoogleMapOfflineTileProvider(file);
offlineOverlay = googleMap.addTileOverlay(new TileOverlayOptions().tileProvider(tileProvider).zIndex(3000));

重要提示：您可以根据谷歌的许可协议的移动设备只能暂时用这个类型的缓存

IMPORTANT : you can use this kind of caching only temporarily on mobile devices according google license agreement.

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