title: Retrieve a Fragment from a ViewPager
body: <p>I'm using a <code>ViewPager</code> together with a <code>FragmentStatePagerAdapter</code> to host three different fragments:</p>
  
  <ul>
  <li>[Fragment1]</li>
  <li>[Fragment2]</li>
  <li>[Fragment3]</li>
  </ul>
  
  <p>When I want to get <code>Fragment1</code> from the <code>ViewPager</code> in the <code>FragmentActivity</code>. </p>
  
  <p>What is the problem, and how do I fix it?</p>