What's better? notifyDataSetChanged or notifyItemChanged in loop?

Question

So I have an activity with RecyclerView and I want to change TextView of every item in the RecyclerView by pressing button that has

Answer 1

I would definitely call notifyDataSetChanged() if all of the data items ar no longer valid. When you call notifyItemChanged(mPos), it is equivalent to a call to notifyItemRangeChanged(mPos, 1), and every time it is called, requestLayout() is also called. On the other hand, when you call notifyDataSetChanged() or notifyItemRangeChanged(0, mList.size()), there is only one call to requestLayout().

Your question should now be, what is better, a call to notifyDataSetChanged() or notifyItemRangeChanged(0, mList.size())? For that one I don't have an answer.