@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_progress, container, false);
    }
Provide default implementation to return a simple view.  Subclasses
can override to replace with their own layout.  If doing so, the
returned view hierarchy <em>must</em> have a progress container  whose id
is {@link com.devspark.progressfragment.R.id#progress_container R.id.progress_container}, content container whose id
is {@link com.devspark.progressfragment.R.id#content_container R.id.content_container} and can optionally
have a sibling view id {@link android.R.id#empty android.R.id.empty}
that is to be shown when the content is empty.
<p/>
<p>If you are overriding this method with your own custom content,
consider including the standard layout {@link com.devspark.progressfragment.R.layout#fragment_progress}
in your layout file, so that you continue to retain all of the standard
behavior of SherlockProgressFragment. In particular, this is currently the only
way to have the built-in indeterminant progress state be shown.
sherlockprogressfragment/src/com/devspark/progressfragment/SherlockProgressFragment.java