title: Why are some views located inside the legacy tab in Android Studio 3.1 and what replaces them?
body: <p>I've updated my Android Studio to 3.1 stable channel. I've noticed that "All" tabs in palette window are removed and "Legacy" tab is introduced. That tab contains the following:</p>
  
  <p><a href="https://i.stack.imgur.com/KPUFU.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/KPUFU.jpg" alt="The new Legacy tab in AndroidStudio that contains GridLayout, ListView, TabHost, RelativeLayout and GridView"></a></p>
  
  <ul>
  <li>ListView</li>
  <li>TabHost</li>
  <li>RelativeLayout</li>
  <li>GridView</li>
  </ul>
  
  <p>I didn't mention the <code>GridLayout</code> because it's a downloadable dependency rather than a View from the Android APIs.</p>
  
  <p>Which new Views have replaced the views mentioned above?</p>
  
  <p>I know <code>ConstraintLayout</code> replaces <code>RelativeLayout</code>, but what replaces the <code>ListView</code>, the <code>GridView</code> or the <code>TabHost</code>? I want to be up-to-date.</p>