title: Focus lost on refresh in recyclerview
body: <p>guys I am developing android TV app so I used recyclerview horizontally and vertically and I used a method to refresh adapter of vertical recyclerview by using adapter.notifyDataSetChanged() but I am getting one problem.
  1. It's focus is being gone and on press any D-pad key it is not working only right key is working 
  2. I used adapter.notifyItemRangeChanged(0, categoryDataList.size()) but I have still one problem that it's focus is going on first element of layout otherwise last of layout.
  So Please help me as soon as possible.
  Thanks in advance.</p>