在Android中，当parent处于折叠状态时，如何更改可展开列表视图子视图？

public class ExpandableListAdapter extends BaseExpandableListAdapter {
    // 数据源
    private List<String> groups;
    private Map<String, List<String>> children;
    private LayoutInflater inflater;

    public ExpandableListAdapter(Context context, List<String> groups, Map<String, List<String>> children) {
        inflater = LayoutInflater.from(context);
        this.groups = groups;
        this.children = children;
    }

    // 其他方法的实现...

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = inflater.inflate(R.layout.child_item_layout, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.childTextView = convertView.findViewById(R.id.childTextView);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        // 根据parent的折叠状态，改变子项的内容或布局
        if (isGroupExpanded(groupPosition)) {
            viewHolder.childTextView.setText(children.get(groups.get(groupPosition)).get(childPosition));
        } else {
            viewHolder.childTextView.setText("子项内容隐藏");
        }

        return convertView;
    }

    private static class ViewHolder {
        TextView childTextView;
    }
}