code: @Override
  	public void mapTileRequestExpiredTile(MapTileRequestState pState, Drawable pDrawable) {
  		putTileIntoCache(pState.getMapTile(), pDrawable, ExpirableBitmapDrawable.getState(pDrawable));
  
  		// tell our caller we've finished and it should update its view
  		for (final Handler handler : mTileRequestCompleteHandlers) {
  			if (handler != null) {
  				handler.sendEmptyMessage(MAPTILE_SUCCESS_ID);
  			}
  		}
  
  		if (Configuration.getInstance().isDebugTileProviders()) {
  			Log.d(IMapView.LOGTAG,"MapTileProviderBase.mapTileRequestExpiredTile(): " + MapTileIndex.toString(pState.getMapTile()));
  		}
  	}
docs: Called by implementation class methods indicating that they have produced an expired result
  that can be used but better results may be delivered later. The tile is added to the cache,
  and a MAPTILE_SUCCESS_ID message is sent.
  
  @param pState
  the map tile request state object
  @param pDrawable
  the Drawable of the map tile