title: How to know focus element in recyclerview fullscreen
body: <p>I've set a recyclerview that works fine. I want to know when some element have the focus in the screen. My recyclerview display every item to fullscreen. Is possible to know, in the viewholder or in some place, what's the item that have the focus?</p>
  <p>My problem is that I have a countdown in every item. And I only want that the countdown start when the item has the focus.</p>