title: Use group in ConstraintLayout to listen for click events on multiple views
body: <p>Basically I'd like to attach a single OnClickListener to multiple views inside a ConstraintLayout.</p>
  
  <p>Before migrating to the ConstraintLayout the views where inside one layout onto which I could add a listener. Now they are on the same layer with other views right under the ConstraintLayout.</p>
  
  <p>I tried adding the views to a <code>android.support.constraint.Group</code> and added a OnClickListener to it programmatically.</p>
  
  <pre><code>group.setOnClickListener {
      Log.d("OnClick", "groupClickListener triggered")
  }
  </code></pre>
  
  <p>However this does not seem to work as of the ConstraintLayout version <code>1.1.0-beta2</code></p>
  
  <p>Have I done something wrong, is there a way to achieve this behaviour or do I need to attach the listener to each of the single views? </p>