我正在使用谷歌地图API V2开发一个
Android应用程序,我必须使用离线图块,我在我的SD卡中拥有整个城市的所有图块(来自png格式的开放街道地图).
我已经尝试使用TileProvider接口,但没有工作.
我怎样才能做到这一点 ？
提前致谢.
我已经尝试使用TileProvider接口,但没有工作.
我怎样才能做到这一点 ？
提前致谢.
解决方法
我修改了一些东西并且有效.这是代码：
CustomMapTileProvider.java
public class CustomMapTileProvider implements TileProvider {
private static final int TILE_WIDTH = 256;
private static final int TILE_HEIGHT = 256;
private static final int BUFFER_SIZE = 16 * 1024;
Override
public Tile getTile(int x,int y,int zoom) {
byte[] image = readTileImage(x,y,zoom);
return image == null ? null : new Tile(TILE_WIDTH,TILE_HEIGHT,image);
}
private byte[] readTileImage(int x,int zoom) {
FileInputStream in = null;
ByteArrayOutputStream buffer = null;
try { in = new FileInputStream(getTileFile(x,zoom));
buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[BUFFER_SIZE];
while ((nRead = in .read(data,BUFFER_SIZE)) != -1) {
buffer.write(data,nRead);
}
buffer.flush();
return buffer.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
} catch (OutOfMemoryError e) {
e.printStackTrace();
return null;
} finally {
if ( in != null)
try { in .close();
} catch (Exception ignored) {}
if (buffer != null)
try {
buffer.close();
} catch (Exception ignored) {}
}
}
private File getTileFile(int x,int zoom) {
File sdcard = Environment.getExternalStorageDirectory();
String tileFile = "/TILES_FOLDER/" + zoom + '/' + x + '/' + y + ".png";
File file = new File(sdcard,tileFile);
return file;
}
}
将TileOverlay添加到您的GoogleMap实例
... map.setMapType(GoogleMap.MAP_TYPE_NONE); TileOverlayOptions tileOverlay = new TileOverlayOptions(); tileOverlay.tileProvider(new CustomMapTileProvider()); map.addTileOverlay(tileOverlay).setZIndex(0); ...
