How to extend the Adapter? For example, set RecyclerView.Adapter.getItemId()

[xiaolongyuan]

RecyclerView.Adapter.getItemId()

        /**
         * Return the stable ID for the item at <code>position</code>. If {@link #hasStableIds()}
         * would return false this method should return {@link #NO_ID}. The default implementation
         * of this method returns {@link #NO_ID}.
         *
         * @param position Adapter position to query
         * @return the stable ID of the item at position
         */
        public long getItemId(int position) {
            return NO_ID;
        }

RecyclerMultiAdapter.getItemId is not extensible

 @Override
    public long getItemId(int position) {
        return position;
    }