Fragment Issue中的ExpandableListView

我正在尝试在一个片段中实现Expandable listView。有未来没有任何错误，当我尝试从两个日志的输出List<String>和HashMap<String, List<String>>，我得到的实际数据记录。

我遇到的问题是当我在片段中显示实际的Expandable Listview时。仅显示列表的第一项，我无法展开它（如下面的屏幕截图所示）：

。

这是我正在使用的代码：

片段类

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;
                }
            }
        }

编辑：这是fragment_lineup.xml文件的代码：

<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>

然后，我还有另外两个用于自定义布局的lavout文件。

一个为**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>

另一个用于**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>

请注意，我需要使用一个片段，因为此类是我正在开发的较大应用程序的一部分，并使用选项卡。整个代码在一个活动中运行良好。

我怀疑我的问题出在适配器类中。