在ExpandableListView中获取ID或子元素的名称

Question

我有一个类别和项目（每个项目都属于类别）的ExpandableListView。 现在，我只想获取列表中单击项的ID或名称，并将其显示在Toast消息中。 但是当我单击一个项目时，什么也没有发生，没有吐司。

这是我的ExpandableListView适配器（相关部分）：

public class Expandable_ListView_Adapter extends BaseExpandableListAdapter {

LayoutInflater inflater;
ArrayList<Category> arr_categories;
Context context;

public Expandable_ListView_Adapter(Context context, ArrayList<Category> categories)
{
    inflater = LayoutInflater.from(context);
    arr_categories = categories;
    this.context=context;
}


@Override
public Object getChild(int groupPosition, int childPosition) {
    return arr_categories.get(groupPosition).getCategory_items().get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {

    Category category = arr_categories.get(groupPosition);
    int category_id = category.getCategory_id();

    return category_id;
}

@Override
public long getChildId(int groupPosition, int childPosition) {

    Category category = arr_categories.get(groupPosition);
    Base_Item base_item = category.getCategory_items().get(childPosition);
    int id = base_item.getItem_id();

    Toast.makeText(context, "Category: "+category.getCategory_name() + ", \nItem: "+base_item.getItem_name()
            + "\nID: "+id,
            Toast.LENGTH_SHORT).show();

    return id;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {

    final Category category = arr_categories.get(groupPosition);

    convertView = inflater.inflate(R.layout.row_category, parent, false);
    ((TextView)convertView.findViewById(R.id.tv_category_name)).setText(category.getCategory_name());

    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {

    final Category category = arr_categories.get(groupPosition);
    final Base_Item base_item = category.getCategory_items().get(childPosition);

    convertView = inflater.inflate(R.layout.row_base_item, parent, false);
    ((TextView)convertView.findViewById(R.id.tv_base_item_name)).setText(base_item.getItem_name());

    return convertView;
}

这是我的片段中的代码：

public class Fragment_Master_List extends Fragment {

Task_DB_Manager manager;
Expandable_ListView_Adapter adapter;
ArrayList<Category> arr_all_categories;
ExpandableListView master_lv;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_master_list, container, false);

    master_lv = (ExpandableListView) view.findViewById(R.id.elv_master_list);

    manager = new Task_DB_Manager(getActivity());
    arr_all_categories = manager.get_all_categories();
    adapter = new Expandable_ListView_Adapter(getActivity(), arr_all_categories);
    master_lv.setAdapter(adapter);

    master_lv.setOnChildClickListener(new OnChildClickListener() {
        @Override
        public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id) {
            Toast.makeText(getActivity(), "Item: "+arr_all_categories.get(groupPosition).getCategory_items().get(childPosition).getItem_name().toString(), Toast.LENGTH_SHORT).show();
            //Toast.makeText(getActivity(), "Item id: "+adapter.getChildId(groupPosition, childPosition), Toast.LENGTH_SHORT).show();
            return false;
        }
    });
    return view;
}

}

当我单击一个项目（孩子）时，怎么不吐司？如何解决？ 谢谢！

Answer 1

经过研究后，我找到了解决方案！ 我不得不更改此自动创建的方法（我认为这是不相关的），以返回true而不是false：

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}