onBindViewHolder
Implementation of Adapter.onBindViewHolder(RecyclerView.ViewHolder, int) that determines if the list item is a group or a child and calls through to the appropriate implementation of either onBindGroupViewHolder or onBindChildViewHolder.
Parameters
holder
Either the GroupViewHolder or the ChildViewHolder to bind data to
position
The flat position (or index in the list of getVisibleItemCount in the list at which to bind