question: @ SuppressWarnings ( "unchecked" ) void bindDropDownViewHolder ( ViewHolder viewHolder , int position ) { if ( position < getHeadersCount ( ) ) { onBindHeaderViewHolder ( viewHolder , position ) ; } else if ( position > getFooterStartIndex ( ) ) { onBindFooterViewHolder ( viewHolder , position - getFooterStartIndex ( ) - 1 ) ; } else { onBindDropDownViewHolder ( ( Holder ) viewHolder , position - getHeadersCount ( ) ) ; } }
target:  Internally binds the drop down view holder and takes into account header and footer view holders.