flutter: GlobalKey error when using Drawer-CodePudding

I`m new to flutter.

After login, the screen goes dark and the following error occurs when moving to the my HomePage.　How can I solve this problem?

The following assertion was thrown while finalizing the widget tree: Multiple widgets used the same GlobalKey. The key [LabeledGlobalKey#c6bc9] was used by multiple widgets. The parents of those widgets were:

HomePage(state: _HomePageState#8437e)
HomePage(state: _HomePageState#f49a2) A GlobalKey can only be specified on one widget at a time in the widget tree.

This is my HomePage

class HomePage extends StatefulWidget {
  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  String uid = FirebaseAuth.instance.currentUser!.uid;

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: _willPopCallback,
      child: Scaffold(
        key: _scaffoldKey,
        endDrawer: Drawer(
          child: ListView(
            children: [
              ...
            ],
          ),
        ),
        appBar: AppBar(
          automaticallyImplyLeading: false,
          actions: [
            IconButton(
                onPressed: () {
                  showProfileDialog(context, uid: uid);
                },
                icon: const Icon(Icons.account_circle, size: 30)),
            IconButton(
              onPressed: () {
                _scaffoldKey.currentState!.openEndDrawer();
              },
              icon: const Icon(
                Icons.dehaze_sharp,
                size: 30,
              ),
            ),
            const SizedBox(width: 10)
          ],
        ),
        body: Center(
          child: 
           ...   
          ),
        ),
      ),
    );
  }
}

Future<bool> _willPopCallback() async {
  return true;
}

GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

CodePudding user response：

you can access to key

 Scaffold.of(context).openDrawer();

and this will work without create GlobalKey

CodePudding user response：

It means that the key still holds the state of the old widget. Try resetting the global key in dispose of HomePageState class.