function will be run in the UI thread, while the fetch happens in a
 background thread. This ensures that the UI does not freeze while the fetch happens.
 <p/>
 For example, this sample code fetches all objects of class <code>"MyClass"</code>. It calls a
 different function depending on whether the fetch succeeded or not.
 <p/>
 <pre>
 ParseQuery&lt;ParseObject&gt; query = ParseQuery.getQuery(&quot;MyClass&quot;);
 query.findInBackground(new FindCallback&lt;ParseObject&gt;() {
   public void done(List&lt;Pa