title: Getting height of a page
body: <p>I've got a page that has an action bar and a layout that takes the rest of the page. I'd like to know the height of the rest of the page - that's SCREEN_HEIGHT - STATUS_BAR_HEIGHT - ACTION_BAR_HEIGHT.</p>
  
  <p>I can get SCREEN_HEIGHT via platform.screen.mainScreen.heightDIPs.</p>
  
  <p>How can I get the height of the STATUS_BAR and ACTION_BAR.</p>
  
  <p>When I try to do a height or getMeasuredHeight(), I get 0.</p>