title: Import facebook sdk android 4, class errors
body: <p>I need to import facebook android sdk 4 (the lastest version) on eclipse, but i have some problems.
  In fact some SDK classe can't found the sequent classes</p>
  
  <ul>
  <li>AppLink</li>
  <li>Continuation</li>
  <li>Task</li>
  <li>AppLinkResolver</li>
  </ul>
  
  <p>what's wrong?</p>