带有 ListTiles 和按钮行的 Flutter 下拉菜单

我正在尝试构建一个自定义下拉菜单，如下所示：

我已经成功地实现了ListTiles and Row of Buttons没有下拉菜单，但我不确定如何将所有内容嵌套在下拉菜单类中。这是我到目前为止所得到的：

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: Drawer(),
      body: SizedBox.expand(
        child: SingleChildScrollView(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              ListTile(
                onTap: () {},
                leading: CircleAvatar(backgroundColor: Colors.primaries[0]),
                title: Text('All Circles'),
              ),
              Divider(color: Colors.grey.shade400, indent: 72.0, height: 1.0),
              ListTile(
                onTap: () {},
                leading: CircleAvatar(backgroundColor: Colors.primaries[1]),
                title: Text('Pickup'),
              ),
              Divider(color: Colors.grey.shade400, indent: 72.0, height: 1.0),
              ListTile(
                onTap: () {},
                leading: CircleAvatar(backgroundColor: Colors.primaries[2]),
                title: Text('Kappa Delta'),
              ),
              Divider(color: Colors.grey.shade400, indent: 72.0, height: 1.0),
              ListTile(
                onTap: () {},
                leading: CircleAvatar(backgroundColor: Colors.primaries[3]),
                title: Text('Ok Boomer'),
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  RaisedButton(
                    child: Text("Join a Circle"),
                    color: Color(0xffb74093),
                    shape: RoundedRectangleBorder(
                      borderRadius: new BorderRadius.circular(18.0),
                      side: BorderSide(color: Colors.red),
                    ),
                  ),
                  RaisedButton(
                    child: Text("Create a Circle"),
                    color: Colors.red,
                    textColor: Colors.white,
                    shape: RoundedRectangleBorder(
                      borderRadius: new BorderRadius.circular(18.0),
                      side: BorderSide(color: Colors.red),
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

我不确定你可以使用ListTile之后items:直接地。 如果您确实运行了上面的代码，则会出现错误。 它需要返回DropdownMenuItem代替ListTile直接地

return DropdownMenuItem<String>(
    value: value,
    child: Row(
    children: <Widget>[
        CircleAvatar(backgroundColor: Colors.primaries[3]),
        Text(value)
    ],
));

我认为上面的代码是相对正确的。