title: How to use FirebaseRecyclerAdapter under AndroidX?
body: <p>How to use FirebaseRecyclerAdapter under AndroidX?</p>
  
  <pre><code>private FirebaseRecyclerAdapter&lt;Game, GameViewHolder&gt; mAdapter;
  </code></pre>
  
  <p>gives an error:</p>
  
  <blockquote>
    <p>Type parameter 'com.name.name.viewholder.GameViewHolder' is not within
    its bound; should extend
    'android.support.v7.widget.recyclerview.viewholder'</p>
  </blockquote>
  
  <p>xml:</p>
  
  <pre><code>&lt;androidx.recyclerview.widget.RecyclerView
          android:id="@+id/games_list"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:clipToPadding="false"
          android:padding="5dp"
          android:scrollbars="vertical"
          tools:listitem="@layout/item_favorite" /&gt;
  </code></pre>