title: How to get root ViewGroup from a layout that was set using setContentView?
body: <p>I cannot seem to find a way to get this ViewGroup. Not sure if there are any standard ways to get ViewGroups.</p>
  
  <p>What I want to accomplish is to dynamically add a full screen overlay view to any Layout at run time, and in order to do this, I always need to get the root ViewGroup.  Is this the right way to do this?</p>