Osmdroid 5.6, offline MBTiles

Question

我正在尝试离线使用 MBtiles 与 osmdroid，

我从这里获取了代码示例 https://github.com/osmdroid/osmdroid/blob/master/OpenStreetMapViewer/src/main/java/org/osmdroid/samplefragments/tileproviders/SampleOfflineOnly.java

但是总是显示空地图，我的代码有问题吗？

我的代码是：

public class OSMDroid extends AppCompatActivity {
private MapView mapView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_osmdroid);
mapView = (MapView) findViewById(R.id.map);

String name = "map.mbtiles";
File f = new File(Environment.getExternalStorageDirectory() + "/osmdroid", name);
if (f.exists()) {
try {
//ok found a file we support and have a driver for the format, for this demo, we'll just use the first one
//create the offline tile provider, it will only do offline file archives
//again using the first file
OfflineTileProvider tileProvider = new OfflineTileProvider(new SimpleRegisterReceiver(this),
new File[]{f});
//tell osmdroid to use that provider instead of the default rig which is (asserts, cache, files/archives, online
mapView.setTileProvider(tileProvider);
//this bit enables us to find out what tiles sources are available. note, that this action may take some time to run
//and should be ran asynchronously. we've put it inline for simplicity
String source = "";
IArchiveFile[] archives = tileProvider.getArchives();
if (archives.length > 0) {
//cheating a bit here, get the first archive file and ask for the tile sources names it contains
Set<String> tileSources = archives[0].getTileSources();
//presumably, this would be a great place to tell your users which tiles sources are available
if (!tileSources.isEmpty()) {
//ok good, we found at least one tile source, create a basic file based tile source using that name
//and set it. If we don't set it, osmdroid will attempt to use the default source, which is "MAPNIK",
//which probably won't match your offline tile source, unless it's MAPNIK
source = tileSources.iterator().next();
mapView.setTileSource(FileBasedTileSource.getSource(source));
} else {
mapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
}
} else {
mapView.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE);
}
mapView.setUseDataConnection(false);
mapView.setBuiltInZoomControls(true);
IMapController mapController = mapView.getController();
mapController.setZoom(10);
GeoPoint startPt = new GeoPoint(61.5797,51.5997);
mapController.setCenter(startPt);
mapView.invalidate();
return;
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}

MBTilesFileArchive getTileSources 总是返回空字符串，下面是实现：

public Set<String> getTileSources(){
//the MBTiles spec doesn't store source information in it, so we can't return anything
return Collections.EMPTY_SET;
}

Answer 1

为了制作离线地图，您应该先添加图块。您可以使用Maperitive 应用程序制作地图图块(zip 比 sql 更容易管理(。将 zip 命名为 MapquestOSM。完成后，在手机内存中创建一个文件夹"osmdroid"(直接进入内部存储器或SD卡(，然后将地图图块添加到其中。

XYTileSource 的参数将更改与您创建的地图切片相关。此代码处理有关地图图块本身的所有内容。希望对您有所帮助

mapView.setUseDataConnection(false);
mapView.setTileSource(new XYTileSource("MapquestOSM", 2, 15, 256, ".png", new String[]{}));