title: the ShareActionProvider doesn't work
body: <p>i create a menu with a menuitem that works with ShareActionProvider</p>
  
  <p>it works well.
  but if the menuitem does not shown as an action,when the menuitem is clicked,it does nothing.</p>
  
  <p>and so i wrote like this</p>
  
  <pre><code>onOptionItemSelected(...){
      if(item.getitemid()==r.id.mi_share){
            item.getactionprovider.onperformaction();
      }
  }
  </code></pre>
  
  <p>i thought it would work. but it does nothing.
  i found the method onPerformAction in ShareActionProvider does nothing ,just return false;</p>
  
  <p>so what should i do?</p>