docs: @Override
  	public void mapTileRequestFailed(final MapTileRequestState pState) {
  
  		if (mTileNotFoundImage!=null) {
  			putTileIntoCache(pState.getMapTile(), mTileNotFoundImage, ExpirableBitmapDrawable.NOT_FOUND);
  			for (final Handler handler : mTileRequestCompleteHandlers) {
  				if (handler != null) {
  					handler.sendEmptyMessage(MAPTILE_SUCCESS_ID);
  				}
  			}
  		} else {
  			for (final Handler handler : mTileRequestCompleteHandlers) {
  				if (handler != null) {
  					handler.sendEmptyMessage(MAPTILE_FAIL_ID);
  				}
  			}
  		}
  		if (Configuration.getInstance().isDebugTileProviders()) {
  			Log.d(IMapView.LOGTAG,"MapTileProviderBase.mapTileRequestFailed(): " + MapTileIndex.toString(pState.getMapTile()));
  		}
  	}