如何在ExpandableListView中单击父项时加载子项

// 创建ExpandableListView和适配器
ExpandableListView expandableListView = findViewById(R.id.expandableListView);
ExpandableListAdapter adapter = new ExpandableListAdapter();

// 准备数据
List<String> parentItems = new ArrayList<>();
Map<String, List<String>> childItems = new HashMap<>();

parentItems.add("父项1");
parentItems.add("父项2");

List<String> child1 = new ArrayList<>();
child1.add("子项1-1");
child1.add("子项1-2");

List<String> child2 = new ArrayList<>();
child2.add("子项2-1");
child2.add("子项2-2");

childItems.put(parentItems.get(0), child1);
childItems.put(parentItems.get(1), child2);

// 设置适配器
adapter.setParentItems(parentItems);
adapter.setChildItems(childItems);
expandableListView.setAdapter(adapter);

// 设置点击事件监听器
expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
    @Override
    public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
        // 处理父项点击事件
        List<String> childData = childItems.get(parentItems.get(groupPosition));
        if (childData != null) {
            // 更新适配器
            adapter.setChildData(childData);
            adapter.notifyDataSetChanged();
        }
        return false;
    }
});