OSMDroid离线地图：Android设备上空白地图的异常“无法读取SD卡上的目录”

Question

       MapView mapView = new MapView(this, 256); //constructor
       mapView.setClickable(true);
       mapView.setBuiltInZoomControls(true);
       setContentView(mapView); //displaying the MapView
       mapView.setTileSource(TileSourceFactory.MAPQUESTOSM);
       mapView.getController().setZoom(15); 
       mapView.getController().setCenter(new GeoPoint(mLat, mLon));
       mapView.setUseDataConnection(true); 
       mapView.setMultiTouchControls(true);

I have made an offline map with Atlas creator using OSMDroid MapQuest

I have placed zip file inside Sdcard inside "osmdroid" folder.

But

When i run my android application there is excetion that

**fail to read directory

and showing "blank map" on my android device

Please please help.

Answer 1

If you're using Lollipop, you cannot read from any arbitrary directory from the SDCard. You have to do one of these:

• Request for permission through SAF to read from any directory on the sdcard : How to use the new SD card access API presented for Android 5.0 (Lollipop)?
• Write to your app specific folder on the sdcard by calling context.getExternalFilesDirs and choosing the sdcard path that is returned.