android - recyclerview - listview adapter

ExpandableListView en Fragment Issue

Question

Estoy tratando de implementar una ListView ampliable en un fragmento. No hay errores que vienen y cuando trato de registrar el resultado tanto de List<String> como de HashMap<String, List<String>> , obtengo los datos reales registrados.

El problema que estoy recibiendo es cuando muestro la Lista desplegable actual en el fragmento. Solo se muestra el primer elemento de la lista y no puedo expandirlo (como se muestra en la captura de pantalla a continuación):

.

Este es el código que estoy usando:

Clase de Fragmento

public static class LineupFragment extends Fragment {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

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

        View rootView = inflater.inflate(R.layout.fragment_lineup, null);

        expListView = (ExpandableListView) rootView.findViewById(R.id.expListView);

        prepareListData();

        listAdapter = new ExpandableListAdapter(getActivity(), listDataHeader, listDataChild);
        expListView.setAdapter(listAdapter);

        Log.i("groups", listDataHeader.toString());
        Log.i("details", listDataChild.toString());

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,int groupPosition, long id) {
                // Toast.makeText(getApplicationContext(),
                // "Group Clicked " + listDataHeader.get(groupPosition),
                // Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                Toast.makeText(getActivity().getApplicationContext(),listDataHeader.get(groupPosition) + " Expanded",Toast.LENGTH_SHORT).show();
            }
        });

        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getActivity().getApplicationContext(),listDataHeader.get(groupPosition) + " Collapsed",Toast.LENGTH_SHORT).show();
            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                Toast.makeText(getActivity().getApplicationContext(),listDataHeader.get(groupPosition) + " : " + listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition), Toast.LENGTH_SHORT).show();
                return false;
            }
        });   
    return rootView;
    }

    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");

        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("The Shawshank Redemption");
        top250.add("The Godfather");
        top250.add("The Godfather: Part II");
        top250.add("Pulp Fiction");
        top250.add("The Good, the Bad and the Ugly");
        top250.add("The Dark Knight");
        top250.add("12 Angry Men");

        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("The Conjuring Despicable Me TurboGrown Ups 2 Red 2 the Wolverine The Conjuring Despicable Me TurboGrown Ups 2 Red 2 the Wolverine");

        List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("2 Guns");
        comingSoon.add("The Smurfs 2");
        comingSoon.add("The Spectacular Now");
        comingSoon.add("The Canyons");
        comingSoon.add("Europa Report");

        listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(1), nowShowing);
        listDataChild.put(listDataHeader.get(2), comingSoon);

    }

**Adapter class**

    public class ExpandableListAdapter extends BaseExpandableListAdapter {

                private Activity _context;
                private List<String> _listDataHeader; // header titles
                // child data in format of header title, child title
                private HashMap<String, List<String>> _listDataChild;

                public ExpandableListAdapter(Activity context, List<String> listDataHeader,
                        HashMap<String, List<String>> listChildData) {
                    this._context = context;
                    this._listDataHeader = listDataHeader;
                    this._listDataChild = listChildData;
                }

                @Override
                public Object getChild(int groupPosition, int childPosititon) {
                    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                            .get(childPosititon);
                }

                @Override
                public long getChildId(int groupPosition, int childPosition) {
                    return childPosition;
                }

                @Override
                public View getChildView(int groupPosition, final int childPosition,
                        boolean isLastChild, View convertView, ViewGroup parent) {

                    final String childText = (String) getChild(groupPosition, childPosition);

                    if (convertView == null) {
                        LayoutInflater infalInflater = (LayoutInflater) this._context
                                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                        convertView = infalInflater.inflate(R.layout.list_item, null);
                    }

                    TextView txtListChild = (TextView) convertView.findViewById(R.id.lblListItem);

                    txtListChild.setText(childText);
                    return convertView;
                }

                @Override
                public int getChildrenCount(int groupPosition) {
                    return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                            .size();
                }

                @Override
                public Object getGroup(int groupPosition) {
                    return this._listDataHeader.get(groupPosition);
                }

                @Override
                public int getGroupCount() {
                    return this._listDataHeader.size();
                }

                @Override
                public long getGroupId(int groupPosition) {
                    return groupPosition;
                }

                @Override
                public View getGroupView(int groupPosition, boolean isExpanded,
                        View convertView, ViewGroup parent) {
                    String headerTitle = (String) getGroup(groupPosition);
                    if (convertView == null) {
                        LayoutInflater infalInflater = (LayoutInflater) this._context
                                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                        convertView = infalInflater.inflate(R.layout.list_group, null);
                    }

                    TextView lblListHeader = (TextView) convertView.findViewById(R.id.lblListHeader);
                    lblListHeader.setTypeface(null, Typeface.BOLD);
                    lblListHeader.setText(headerTitle);

                    return convertView;
                }

                @Override
                public boolean hasStableIds() {
                    return false;
                }

                @Override
                public boolean isChildSelectable(int groupPosition, int childPosition) {
                    return true;
                }
            }
        }

Editar: este es el código del archivo fragment_lineup.xml :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LinearLayout2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_black"
    android:orientation="vertical" >

    <ExpandableListView
        android:id="@+id/expListView"
        android:layout_width="match_parent"
        android:layout_height="310dp"
        android:layout_weight="0.14" >
    </ExpandableListView>

</LinearLayout>

Luego tengo otros dos archivos lavout para un diseño personalizado.

Uno para **list_group.xml** :

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/bg_black"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="52dp"
        android:layout_height="52dp"
        android:orientation="vertical" >

        <ImageView
            android:id="@+id/photo"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:contentDescription="@string/app_name"
            android:fitsSystemWindows="true" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="52dp"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/lblListHeader"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            android:paddingLeft="6dip"
            android:paddingTop="6dip"
            android:textColor="#CC0000"
            android:textSize="20dp"
            android:textStyle="bold"
            tools:ignore="SpUsage" />

    </LinearLayout>

</LinearLayout>

Y el otro para el **list_item.xml** :

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblListItem"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:paddingBottom="5dp"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft"
        android:paddingTop="5dp"
        android:textSize="13sp" />

</LinearLayout>

Tenga en cuenta que necesito usar un fragmento porque esta clase es parte de una aplicación más grande que estoy desarrollando y usa pestañas. Todo el código funciona bien en una actividad.

Estoy sospechando que mi problema está en la clase de adaptador.

Answer 1

Finalmente descubrí cómo se puede hacer esto. Estoy pegando el siguiente código para cualquiera que haya tenido el mismo problema. Siéntase libre de usar:

public static class LineupFragment extends Fragment {

View rootView;
ExpandableListView lv;
private String[] groups;
private String[][] children;


public LineupFragment() {

}

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

    groups = new String[] { "Test Header 1", "Test Header 2", "Test Header 3", "Test Header 4" };

    children = new String [][] {
        { "s simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry''s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum." },
        { "Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of comes from a line in section 1.10.32." },
        { "It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using ''Content here, content here'', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for ''lorem ipsum'' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like)." },
        { "There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don''t look even slightly believable. If you are going to use a passage of Lorem Ipsum, you need to be sure there isn''t anything embarrassing hidden in the middle of text. All the Lorem Ipsum generators on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over 200 Latin words, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always free from repetition, injected humour, or non-characteristic words etc." }
    };
}

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

return rootView;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    lv = (ExpandableListView) view.findViewById(R.id.expListView);
    lv.setAdapter(new ExpandableListAdapter(groups, children));
    lv.setGroupIndicator(null);

}

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private final LayoutInflater inf;
    private String[] groups;
    private String[][] children;

    public ExpandableListAdapter(String[] groups, String[][] children) {
        this.groups = groups;
        this.children = children;
        inf = LayoutInflater.from(getActivity());
    }

    @Override
    public int getGroupCount() {
        return groups.length;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return children[groupPosition].length;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groups[groupPosition];
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return children[groupPosition][childPosition];
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

         ViewHolder holder;
            if (convertView == null) {
                convertView = inf.inflate(R.layout.list_item, parent, false);
                holder = new ViewHolder();

                holder.text = (TextView) convertView.findViewById(R.id.lblListItem);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.text.setText(getChild(groupPosition, childPosition).toString());

            return convertView;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {
            convertView = inf.inflate(R.layout.list_group, parent, false);

            holder = new ViewHolder();
            holder.text = (TextView) convertView.findViewById(R.id.lblListHeader);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.text.setText(getGroup(groupPosition).toString());

        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    private class ViewHolder {
        TextView text;
    }
}

Y así es como se ve ahora el nuevo diseño:

Siéntase libre de usar esto en su código y espero haberlo ayudado de alguna manera :)

Answer 2

La solución de Dev.mi funciona bien. Pero estaba atrapado en un problema similar debido a un error estúpido. Estaba haciendo un diseño poco sofisticado y había utilizado scrollView como padre raíz para ExpandableListView.

ExpandableListView with wrapcontent dentro del diseño lineal es suficiente para que sea desplazable.

Al agregar Vista desplazable hacia afuera, se hizo que ListView expansible se contrajera para mostrar solo un encabezado.

No coloque ExpandableListView dentro de la Vista de desplazamiento