Question

可扩展的列表视图是正确的，但在再次调用时它不会刷新。旧的项目再次出现在可扩展列表视图中。这是我的适配器类。如何在expab = ndable listview中刷新项目？

MyAdapter.class

public class MyAdapter extends BaseExpandableListAdapter {
 private Context _context;
    private static List<String> _listDataHeader; // header titles
    // child data in format of header title, child title
    private static  HashMap<String, List<String>> _listDataChild;

    public MyAdapter(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;
    }

}

Answer 1

将此方法添加到MyAdapter并使用它：

public void setNewItems(List<String> listDataHeader,HashMap<String, List<String>> listChildData) {
    this._listDataHeader = listDataHeader;
    this._listDataChild = listChildData;
    notifyDataSetChanged();
 }

Answer 2

listView.invalidateViews()也可以在这里提供帮助

Answer 3

您应该在适配器外调用此功能以满足您的需要。在主要课程中，您可以在onClick或onExpand之后调用此作品。

adapter.notifyDataSetChanged();

应该这样做。

Answer 4

需要在适配器内完成

假设从标题单击项目之后，然后在项目单击侦听器内部，我们需要刷新可扩展列表。只需使用键从子哈希图中清除该项目，然后从标题数组列表中清除项目，然后通知数据集已更改。

childList.remove(parentList.get(groupPosition));
parentList.remove(parentList.get(groupPosition));
notifyDataSetChanged();

刷新可扩展列表视图

4 个答案: