title: Android layout with different items on landscape and on portrait
body: <p>I have main.xml in res/layout-land and in res/layout. There's a grid of 12 icons, 3 by 4 (width, height, respectively). If the user rotates to landscape, I want to display them with a ViewPager of 3 by 2, and 3 by 2 in two pages. So in the res/layout there's a grid of 12 items and in the res/layout-land there's a ViewPager, to which I need to give a PagerAdapter.</p>
  
  <p>My question is: under the assumption I'm working with configChanges="orientation", how do I do that? Or more specifically, Where for example do I give the ViewPager its PagerAdapter?</p>