getView is not being called but getCount has items in Listview

Question

I’m having a problem with a Listview that isn’t loading the values. That’s my situation:

I have an application that at a certain point opens a Tabbar with 2 Fragments and inside one of these Fragments I have a Listview that I am trying to popular through a POST request with Volley.

I’m bringing the values correctly through the webservice It brings results (getCount() in the Adapter has values), but it’s not entering getView() so I think that’s why it’s not displaying anything in Listview.

Adapter:

 public class LancarVendaCarrinhoListViewAdapter extends BaseAdapter
 {
    private Context mContext;
    private List<PesquisarProdutoObjetoRetorno> mDataSource;

    public LancarVendaCarrinhoListViewAdapter(Context context, List<PesquisarProdutoObjetoRetorno> items)
    {
        mContext = context;
        mDataSource = items;
    }

    @Override
    public int getCount() {
        return mDataSource.size();
    }

    @Override
    public Object getItem(int position) {
        return mDataSource.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        try
        {
            LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View sView = mInflater.inflate(R.layout.activity_lancarvenda_carrinho_list_view_item, parent, false);

            PesquisarProdutoObjetoRetorno sItem = (PesquisarProdutoObjetoRetorno) getItem(position);

            TextView descricao = (TextView)sView.findViewById(R.id.lancarvenda_carrinho_item_txtdescricao);
            descricao.setText(sItem.getDescricao());

            TextView preco = (TextView)sView.findViewById(R.id.lancarvenda_carrinho_item_txvpreco);
            preco.setText(String.valueOf(sItem.getPreco()));

            EditText quantidade = (EditText)sView.findViewById(R.id.lancarvenda_carrinho_item_etquantidade);
            quantidade.setText("1");

            return sView;
        }
        catch (Exception e)
        {
            e.printStackTrace();
            return null;
        }
    }

    public List<PesquisarProdutoObjetoRetorno> getItemList()
    {
        return mDataSource;
    }

    public void setItemList(List<PesquisarProdutoObjetoRetorno> itemList)
    {
        this.mDataSource = itemList;
    }
}

Fragment:

 public class LancarVendaCarrinhoFragment extends Fragment 
 {
    private ListView fCarrinhoResultado;
    List<PesquisarProdutoObjetoRetorno> sCarrinhoAuxiliar;
    LancarVendaCarrinhoListViewAdapter sAdaptador;

    private PesquisarProdutoRequest sCorpoBusca = new PesquisarProdutoRequest();

    public LancarVendaCarrinhoFragment() {

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LayoutInflater sInflater = getActivity().getLayoutInflater();
        View sView = sInflater.inflate(R.layout.fragment_lancarvenda_carrinho, null);

        fCarrinhoResultado = (ListView) sView.findViewById(R.id.lancarvenda_carrinho_lvwresultado);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Time sData = new Time();
        sData.setToNow();

        sCorpoBusca = new PesquisarProdutoRequest();
        sCorpoBusca.setIdioma("pt-BR");
        sCorpoBusca.setUsaGrade(Variaveis.UsaGrade);
        sCorpoBusca.setFilial(Variaveis.Filial);
        sCorpoBusca.setUFFilial(Variaveis.UFFilial);
        sCorpoBusca.setTipoSistema(Variaveis.TipoSistema);
        sCorpoBusca.setNumeroCaixa(Variaveis.NumeroCaixa);
        sCorpoBusca.setRede(Variaveis.Rede);
        sCorpoBusca.setTabelaTributo((byte) 0);
        sCorpoBusca.setCodigoProduto("0030900939");

        PesquisarProduto();


        return inflater.inflate(R.layout.fragment_lancarvenda_carrinho, container, false);
    }


    private void PesquisarProduto() {
        RequestQueue sQueue = Volley.newRequestQueue(getActivity());
        String sEnderecoBase = "http://www.minha-url";

        sCarrinhoAuxiliar = new ArrayList<>();

        StringRequest sRequest = new StringRequest(Request.Method.POST, sEnderecoBase, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {
                PesquisarProdutoResponse sResultado = new Gson().fromJson((String) response, PesquisarProdutoResponse.class);
                if (sResultado.getCodigoRetorno() == 0) {
                    Variaveis.Carrinho.add(sResultado);

                    try {

                        sCarrinhoAuxiliar.clear();

                        for (int i = 0; i < Variaveis.Carrinho.size(); i++) {
                            PesquisarProdutoObjetoRetorno sItem = Variaveis.Carrinho.get(i).getDadosProduto();
                            sCarrinhoAuxiliar.add(sItem);
                            Variaveis.CarrinhoAuxiliar.add(sItem);
                        }

                        sAdaptador = new LancarVendaCarrinhoListViewAdapter(getActivity(), sCarrinhoAuxiliar);
                        sAdaptador.setItemList(sCarrinhoAuxiliar);
                        fCarrinhoResultado.setAdapter(sAdaptador);

                        sAdaptador.notifyDataSetChanged();


                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                byte[] sBytesResposta = error.networkResponse.data;
                String sTexto = new String(sBytesResposta);
                Mensagem.ExibirAlert(getActivity(), String.valueOf(error.networkResponse.statusCode));
            }
        }) {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> sHeaders = new HashMap<>();
                sHeaders.put("Authorization", "Bearer " + Variaveis.ApiToken);
                return sHeaders;
            }

            @Override
            public byte[] getBody() throws AuthFailureError {
                return new Gson().toJson(sCorpoBusca).getBytes();
            }

            @Override
            public String getBodyContentType() {
                return "application/json";
            }
        };

        sQueue.add(sRequest);
    }
}

Layout of the Fragment

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp">

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/lancarvenda_carrinho_lvwresultado"
        android:orientation="vertical" />

</LinearLayout>

Cell layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <de.hdodenhof.circleimageview.CircleImageView xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/lancarvenda_carrinho_item_imvFoto"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_gravity="center_horizontal"
        android:background="@drawable/circulo_foto2"
        app:border_color="#898989"
        app:border_width="2dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_marginLeft="10dp">

        <TextView
            android:id="@+id/lancarvenda_carrinho_item_txtdescricao"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:text="Relogio Mormaii 2730"
            android:textSize="17dp"
            android:textStyle="bold"
            android:layout_marginRight="8dp"
            android:lines="2"
            android:minLines="2"
            android:singleLine="false"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent">

                <TextView
                    android:id="@+id/lancarvenda_carrinho_item_txvpreco"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignParentLeft="true"
                    android:layout_centerHorizontal="true"
                    android:layout_marginTop="8dp"
                    android:text="R$ 399,89"
                    android:textColor="#1ba39c"
                    android:textSize="19dp"
                    android:layout_marginRight="70dp"/>

                <EditText
                    android:id="@+id/lancarvenda_carrinho_item_etquantidade"
                    android:layout_width="50dp"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:backgroundTint="#9a9b9c"
                    android:hint="0"
                    android:textColor="#2a2d2e"
                    android:layout_marginRight="8dp"/>

            </RelativeLayout>

        </LinearLayout>
    </LinearLayout>

</LinearLayout>

I did a test populating a public variable on another page and then populated any Listview in another Activity and it worked, it goes through getView() and shows the Listview correctly but not in the Fragment being populated in Fragment itself.

Any suggestions? I’ve been searching for days for a solution and nothing..

Answer 1

You are popular with an instance of Listview that is not the one presented in Fragment.

The Listview that is presented in Fragment is in the layout which is created in the onCreateView(), through inflater.inflate(R.layout.fragment_lancarvenda_carrinho, container, false)

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    Time sData = new Time();
    sData.setToNow();

    sCorpoBusca = new PesquisarProdutoRequest();
    .....
    .....
    sCorpoBusca.setCodigoProduto("0030900939");

    PesquisarProduto();

    return inflater.inflate(R.layout.fragment_lancarvenda_carrinho, container, false);
} 

The Listview to which the Adapter was assigned was created in the onCreate()

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    LayoutInflater sInflater = getActivity().getLayoutInflater();
    View sView = sInflater.inflate(R.layout.fragment_lancarvenda_carrinho, null);

    fCarrinhoResultado = (ListView) sView.findViewById(R.id.lancarvenda_carrinho_lvwresultado);
}

Get the Listview reference on onCreateView()

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View sView = inflater.inflate(R.layout.fragment_lancarvenda_carrinho, container, false);

    fCarrinhoResultado = (ListView) sView.findViewById(R.id.lancarvenda_carrinho_lvwresultado);

    Time sData = new Time();
    sData.setToNow();

    sCorpoBusca = new PesquisarProdutoRequest();
    .....
    .....
    sCorpoBusca.setCodigoProduto("0030900939");

    PesquisarProduto();

    return view;
} 

Eliminate the method onCreate().