ListFragment 仅在带有 ExpandableListadpater 的片段视图中显示第一项

Posted 2023-05-07

【中文标题】ListFragment 仅在带有 ExpandableListadpater 的片段视图中显示第一项

【英文标题】：ListFragment only showing first item in Fragment View with ExpandableListadpater

【发布时间】：2021-03-21 17:42:06

【问题描述】：

我有一个包含父项和子项的片段。但是可展开列表只显示父列表中的第一项

问题是列表视图只显示第一个项目。它包含 3 个项目，所以列表视图应该显示 3 个列表。我错过了什么吗？非常感谢。

我的片段是

    public class FragmentChapters extends ListFragment 
    
        ExpandableListAdapter listAdapter;
        ExpandableListView expListView;
        List<String> listDataHeader;
        HashMap<String, List<String>> listDataChild;
        View view;
        Context context;
        public FragmentChapters() 
        
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
            view = inflater.inflate(R.layout.fragment_chapters, container, false);
    
            return view;
        
    
        @Override
        public void onActivityCreated(@Nullable Bundle savedInstanceState) 
            super.onActivityCreated(savedInstanceState);
            expListView = (ExpandableListView) getListView();
    
            prepareListData();
            context=getActivity();
            listAdapter = new ExpandableListAdapter(context, listDataHeader, listDataChild);
    
            // setting list adapter
            expListView.setAdapter(listAdapter);

  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");
        nowShowing.add("Despicable Me 2");
        nowShowing.add("Turbo");
        nowShowing.add("Grown Ups 2");
        nowShowing.add("Red 2");
        nowShowing.add("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);
    

我的可扩展 lisAdpter 是

[public class ExpandableListAdapter extends BaseExpandableListAdapter 

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

    public ExpandableListAdapter(Context 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;
    

我的输出显示此屏幕。片段中仅列出一项。 [1]：https://i.stack.imgur.com/cUiQC.jpg

【参考方案1】：

一切都很好，数据实际上正在加载到可展开的列表视图中。问题在于布局。如果您为展开式列表视图提供固定高度，您可以看到数据。调整用于将片段替换到活动中的视图的父布局（或 NestedScrollView）的高度。