title: How to save RecyclerView's scroll position using RecyclerView.State?
body: <p>I have a question about Android's <a href="http://developer.android.com/reference/android/support/v7/widget/RecyclerView.State.html">RecyclerView.State</a>.</p>
  
  <p>I am using a RecyclerView, how could I use and bind it with RecyclerView.State?</p>
  
  <p>My purpose is to <strong>save the RecyclerView's scroll position</strong>.</p>