public StickyGridHeadersBaseAdapterWrapper(
     Context context, StickyGridHeadersGridView gridView, StickyGridHeadersBaseAdapter delegate) {
   mContext = context;
   mDelegate = delegate;
   mGridView = gridView;
   delegate.registerDataSetObserver(mDataSetObserver);
 }
 @Override
 public void registerDataSetObserver(DataSetObserver observer) {
   super.registerDataSetObserver(observer);
   mDelegate.registerDataSetObserver(observer);
 }