title: setRetainInstance fragment with UI Android
body: <p>Ok, I created a <code>Fragment</code> with some UI (couple textboxes and stuff) and I used <code>setRetainInstance</code> since Im running an <code>AsyncTask</code> to query a server (<em>request can only be sent once</em>) and I need the result of the <code>AsyncTask</code>. So my question is:
  Is it wrong to retain the whole fragment with the UI? I saw couple examples where people use an extra <code>Fragment</code> to use the <code>setRetainInstance</code> but.. is there anything wrong not using that extra one??
  If there is an issue with using the <code>setRetainInstance</code> why is that? Couldn't find any info in the documentation regarding this.</p>