title: Set default menuItem for BottomNavigationView
body: <p>How can i set the default <code>MenuItem</code> for the official <code>BottomNavigationView</code> (com.android.support:design:25.0.1)?</p>
  
  <p>If I call programmatically <code>menuItem.setCheckable(true).setChecked(true)</code> the zoom effect is not performed and the <code>BottomNavigationView</code> shows like this:</p>
  
  <p><a href="https://i.stack.imgur.com/xnt4Z.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xnt4Z.png" alt="BottomNavigationView"></a></p>