title: How to find percentage of each visible item in recycleview
body: <pre><code>int findFirstVisibleItemPosition();
  int findFirstCompletelyVisibleItemPosition();
  int findLastVisibleItemPosition();
  int findLastCompletelyVisibleItemPosition();
  </code></pre>
  
  <p>All this method is giving which item is visible, but how to find percentage of visible item in Recycleview?</p>
  
  <p>i.e findFirstVisibleItemPosition(); is giving position of first visible item but I want to perform some operation when first is visible more then 50 percentage</p>