将适配器设置为ExpendableListView类型不匹配

public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    // 实现适配器的相关方法，包括获取分组数、子项数、分组视图、子项视图等

    @Override
    public int getGroupCount() {
        // 返回分组数
        return groupCount;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        // 返回指定分组的子项数
        return childrenCount;
    }

    @Override
    public Object getGroup(int groupPosition) {
        // 返回指定分组的数据对象
        return groupData;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // 返回指定子项的数据对象
        return childData;
    }

    @Override
    public long getGroupId(int groupPosition) {
        // 返回指定分组的ID
        return groupId;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // 返回指定子项的ID
        return childId;
    }

    @Override
    public boolean hasStableIds() {
        // 返回ID是否稳定，一般返回true
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        // 返回分组视图
        return groupView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        // 返回子项视图
        return childView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // 返回子项是否可选，一般返回true
        return true;
    }
}

MyExpandableListAdapter adapter = new MyExpandableListAdapter();
ExpendableListView listView = findViewById(R.id.expendableListView);
listView.setAdapter(adapter);