Use custom image as a maptile using osmdroid mapview

Issue

Does any body know if its possible to use an image as a custom maptile in a mapview using osmdroid? For example, I'd like the user to be able to select an image stored on the phone from my application and then have that image then replace a tile within my mapview.

Has anyone got any pointers or ideas of how this could be done?

Solution

I'm not sure to understand the real need. For just one specific zoom level?

However, 2 directions:

• OSMBonusPack GroundOverlay let you position a bitmap image somewhere on the map. You can adjust its size, rotation, and transparency. It's not replacing tiles, it's drawn above. And it works at all zoom levels.

• You could try to replace a map tile file with your image file, in the osmdroid file system cache. These 2 utility functions will help you to get the exact file path for a given (lat,lon,zoom):

  public Point getMapTileFromCoordinates(final double aLat, final double aLon, final int zoom){
          final int y = (int) Math.floor((1 - Math.log(Math.tan(aLat * Math.PI / 180) + 1 / Math.cos(aLat * Math.PI / 180)) / Math.PI) / 2 * (1 << zoom));
          final int x = (int) Math.floor((aLon + 180) / 360 * (1 << zoom));
          return new Point(x, y);
  }
  
  public File getFileName(ITileSource tileSource, MapTile tile){
          final File file = new File(OpenStreetMapTileProviderConstants.TILE_PATH_BASE,
                          tileSource.getTileRelativeFilenameString(tile) + OpenStreetMapTileProviderConstants.TILE_PATH_EXTENSION);
          return file;
  }
  

Answered By - MKer