Unpopulated listview on all tabs on first access

Question

Hello, I have an Android application of an electronic questionnaire. Should be presented the same questionnaire in tabs, are 7 tabs. The application downloads web issues from an XML.

I’m using the Volley library to leak access to the questionnaire. When I lower the questionnaire and do the XML Parsing write to the database and then display in a Listview.

The problem is that the questions do not show up in the first two tabs. They appear from the third. And when accessing the third the questions appear in the first and when accessing the fourth they appear in the second. The others work normally.

The code of the Fragments are these:

public class MainActivity extends FragmentActivity {

//declarações e onCreate...


private void requestQuestionario(){
    String tag_string_req = "req_questionario"; //tag para cancelar o request

    pDialog.setMessage("Carregando Questionário...");
    showDialog();

    StringRequest stringRequest = new StringRequest(Request.Method.GET,
            RequestContract.XMLQuestionarioContract.XML_QUESITIONARIO_URL, new Response.Listener<String>() {

        @Override
        public void onResponse(String s) {
            Log.d(TAG, "Response = " + s);

            //TODO -- Tratar Response
            InputStream xml = new ByteArrayInputStream(s.getBytes());
            try {
                HashMap questionario = XmlParser.parse(xml);
                List<Questao> questoes = (List) questionario.get("questoes");

               //insere questoes no banco....


                QuestionarioCache cache = QuestionarioCache.newInstance();
                cache.setQuestoes(questoes);


                cache.getAdapter(getApplication()).notifyDataSetChanged();


            } catch (XmlPullParserException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (SQLException e){
                e.printStackTrace();
            }

            hideDialog();
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError volleyError) {

           //Carrega as questões existentes no banco....
        }
    });

    requestQueue = RequestManager.getInstance(this).getRequestQueue();

    stringRequest.setTag(tag_string_req);
    requestQueue.add(stringRequest);
}


}

Fragment with a Listview

public class ListaQuestoesActivity extends Fragment {
private static final String TAG = ListaQuestoesActivity.class.getSimpleName();

private View v;
private TextView textView;
private ListView listView;

private QuestionarioCache cache;

private int dia;

// onCreate....

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    v = inflater.inflate(R.layout.fragment_lista_questoes, container, false);

    textView = (TextView) v.findViewById(R.id.txt_dia_qionario);
    textView.setText("Dia " + dia);

    carregarListaQuestoes();

    return v;

}


private void carregarListaQuestoes(){
    listView = (ListView) v.findViewById(R.id.list_questoes);

    cache = QuestionarioCache.newInstance();

    listView.setAdapter(cache.getAdapter(getActivity()));


}
}

When I use a static list it appears in all tabs normally:

String[] list = {"Ola", "Mundo", "Foo", "Bar"};

    ArrayAdapter adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, list);

    listView.setAdapter(adapter);

Someone knows how to fix?