title: RecyclerView ScrollY always 0
body: <p>I have a RecyclerView inside a fragment. I need to be notified of scroll changes, so I added a callback to the <code>ScrollChange</code> event (which corresponds to the <code>SetOnScrollChangeListener</code> in classical Android API):</p>
  
  <pre><code>private void RecyclerViewScrollChange(object sender, View.ScrollChangeEventArgs e)
  {
      int deltaY = e.ScrollY - e.OldScrollY;
  }
  </code></pre>
  
  <p>The problem is that deltaY is always zero, because both ScrollY and OldScrollY are always zero. I am using vertical linear layout in the recycler view's layout manager, so the vertical dimension ought to be updated. What can cause this problem?</p>