public class BookAuthorsFragment extends Fragment {
    private ProgressBar mProgressBar;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View ret = inflater.inflate(R.layout.book_authors_fragment, container,
                false);

        mProgressBar = (ProgressBar) ret
                .findViewById(R.id.book_authors_fragment_progbar);
        mProgressBar.setVisibility(View.VISIBLE);

        ParseAuthors pa = new ParseAuthors();
        pa.execute();

        return ret;
    }

    private class ParseAuthors extends
            AsyncTask<Void, Void, ArrayList<HashMap<String, String>>> {

        @Override
        protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
            super.onPostExecute(result);

            // Roba

            mProgressBar.setVisibility(View.INVISIBLE);
        }

        @Override
        protected ArrayList<HashMap<String, String>> doInBackground(
                Void... params) {

            // Roba
        }

    }
}