小编Mar*_* S.的帖子

我有这个屏幕（代码如下），我想在上面打开一个抽屉。每当我点击按钮时，我都会得到以下回报：

class _BarberListState extends State<BarberList> {
  final TextStyle dropdownMenuItem =
  TextStyle(color: Colors.black, fontSize: 18);
  final GlobalKey<ScaffoldState> _key = GlobalKey<ScaffoldState>();
  final primary = Color(0xFF63736B);
  final secondary = Color(0xFF0C0E0B);
  final green = Color(0xFF79FF00);
  final Color active = Colors.grey.shade800;
  final Color divider = Colors.grey.shade600;

  final String image = 'https://cdn.pixabay.com/photo/2017/01/13/01/22/rocket-1976107_960_720.png';


  final List<Map> barberLists = [
    {
      "name": "Barbearia do Laender",
      "location": "Rua Paraná, 184 - Cidade de Deus",
      "type": "De 09h ás 18h - Seg. à Sex.",
      "phone": "(37) 99122-3338",
      "logoText":
      "https://cdn.pixabay.com/photo/2017/01/13/01/22/rocket-1976107_960_720.png",
      "description":
      "Barbaria …