title: Is there an existing method that listens for a RecyclerView item change?
body: <p>Let's say I have a <code>RecyclerView</code>, and when it loads data from the databse, I want to do something. I'd imagine it like this:</p>
  
  <pre><code>recyclerView.setOnUpdateListener(new OnUpdateListener() {
              @Override
              public void onChanged() {
                  //I do whatever I want
              }
          };
  </code></pre>
  
  <hr>
  
  <p><strong>What I've seen:</strong></p>
  
  <p>I've seen <a href="https://stackoverflow.com/questions/27633654/recyclerview-listen-to-item-added">this</a> link but the question isn't too clear; and neither is the answer as it doesn't explain what's it doing. And it's pretty old.</p>
  
  <p>I've seen <a href="https://stackoverflow.com/questions/34175381/implement-load-more-listener-in-expandable-recyclerview">this</a> but it isn't answered yet.</p>
  
  <hr>
  
  <p><strong>Why?</strong></p>
  
  <p>Because I am loading data from the Database, and I want to show a progress circle while it's loading, and dismiss it when data shows.</p>
  
  <p><strong>Note:</strong> I am using a <code>FirebaseRecyclerAdapter</code>.</p>