title: FirebaseUI RecyclerView how to add an element to a defined position
body: <p>Following my recent visit to Firestore I try to use Firebase-UI's RecyclerView but I cannot find a way to add a new element to a certain position.</p>
  
  <p>Here's how I did with a basic RecyclerView:</p>
  
  <pre><code>mDataset.add(position,elenmet);
  mAdapter.notifyItemInserted(position);
  mAdapter.notifyDataSetChanged();
  </code></pre>
  
  <p>I found this method <code>mRecyclerView.addView(view, position);</code> but I do not have a view, only of my element which is an object of the same type as the others.</p>