java - 为什么 osmdroid 不能在离线模式下工作(多个问题)？

Question

我正在开发 OSMdroid 库，并希望使其离线，所以我使用了此代码

 mMapView.setUseDataConnection(false);

但在这种情况下，除了图形页面之外，它甚至不会显示 map 。但是当我将 boolean 更改为 true 时，它再次开始工作。

So how do i make it work completely offline?

我也在尝试获取poi，所以我有以下代码

 geoPoint= new GeoPoint(37.439974,-119.003906);
 double north = 84;
    double east = -180;
    double south = -84;
    double west = 180;
    boundingBoxE6 = new BoundingBoxE6(north, east, south, west);
    mMapView.setScrollableAreaLimit(boundingBoxE6);
    mMapView.setMultiTouchControls(true);
    Marker marker= new Marker(mMapView,mResourceProxy);
    marker.setPosition(geoPoint);
    mMapView.getOverlays().add(marker);
    poiMarkers = new FolderOverlay(getActivity());
    new connection().execute();
    mMapView.invalidate();


public class connection extends AsyncTask{

    @Override
    protected Object doInBackground(Object[] objects) {
        NominatimPOIProvider poiProvider = new NominatimPOIProvider();
        pois=poiProvider.getPOICloseTo(geoPoint,"atm",50,1000);
        return pois;
    }

    @Override
    protected void onPostExecute(Object o) {
        super.onPostExecute(o);
        mMapView.getOverlays().add(poiMarkers);
        Drawable poiIcon = getResources().getDrawable(R.drawable.marker_poi_default);
        if (o != null) {
            for (POI poi : pois) {
                Marker poiMarker = new Marker(mMapView);
                poiMarker.setTitle(poi.mType);
                poiMarker.setSnippet(poi.mDescription);
                poiMarker.setPosition(poi.mLocation);
                poiMarker.setIcon(poiIcon);
                poiMarkers.add(poiMarker);
            }
        }else{
            Toast.makeText(getActivity(),"null",Toast.LENGTH_SHORT).show();
        }
    }
}

But instead of getting the poi on the given geopint i get it somewhere else and everytime i mean whatever the code i change i don't get the poi in any other places other than that

http://nominatim.openstreetmap.org/search?format=json&q=[atm]&limit=50&bounded=1&viewbox=-1119.003906,1037.439974,880.996094,-962.560026

Is it possible to access poi in offline mode?

Answer 1

至于显示离线图 block ，您确定您已将离线 map 图 block .ZIP文件存储在/mnt/sdcard/osmdroid/(或任何您设备的 SD 卡的路径是，它只需位于此文件夹中名为 osmdroid 的子目录中)？

可以在这里找到对我有帮助的好教程:http://www.haakseth.com/?p=30

如果没有互联网连接来检索图 block ，OSMdroid TileSource 将自动查找此.ZIP 文件。在 OpenStreetMapTileProviderConstants 类中有这样一段代码:

/** Base path for osmdroid files. Zip files are in this folder. */
public static final File OSMDROID_PATH = new File(Environment.getExternalStorageDirectory(),
        "osmdroid");

如您所见，您只需要在 SDcard 文件夹中包含 osmdroid 目录，一切就应该可以正常工作。

如果您还没有 map 图 block .ZIP，请查看 Mobile Atlas Creator用于创建这个。