CODEWITHSUNDEEP
firebaseflutterdart
giroprotagonist
giroprotagonist

Reputation: 156

flutter: LateInitializationError: Field 'name' has not been initialized

Error: Runner[463:34314] flutter: LateInitializationError: Field 'name' has not been initialized.

I recently updated to using firebase core and nullsafety and made some changes to my code that I don't quite understand, I'm new to programming here. Any way, I've tried reading this similar thread here about it but I still don't quite grasp it. I understand that I am not using name properly in the initstate most likely but that is as much as I understand. Can someone please provide an example code of what's needed to solve for the error below?

2021-04-10 17:59:41.331476-0700 Runner[463:34314] flutter: LateInitializationError: Field 'name' has not been initialized.

class MyService extends StatefulWidget {
  @override
  _MyServiceState createState() => _MyServiceState();
}

class _MyServiceState extends State<MyService> {
  late String name, email;
  Widget currentWidget = BackgroundBetcher();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    findNameAnEmail();
  }

  Future<Null> findNameAnEmail() async {
    await Firebase.initializeApp().then((value) async {
      FirebaseAuth.instance.authStateChanges().listen((event) {
        setState(() {
          name = event!.displayName!;
          email = event.email!;
        });
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: MyStyle().primaryColor,
      ),
      drawer: buildDrawer(),
      body: currentWidget,
    );
  }

  Drawer buildDrawer() {
    return Drawer(
      child: Stack(
        children: [
          Column(
            children: [
              buildUserAccountsDrawerHeader(),
              buildListTileShowCartoonList(),
              buildListTileInformation(),
            ],
          ),
          buildSignOut(),
        ],
      ),
    );
  }

  ListTile buildListTileShowCartoonList() {
    return ListTile(
      leading: Icon(
        Icons.face,
        size: 36,
      ),
      title: Text('Manual Location Update'),
      subtitle: Text('Send a single location update'),
      onTap: () {
        setState(() {
          currentWidget = PageWidget();
        });
        Navigator.pop(context);
      },
    );
  }

  ListTile buildListTileInformation() {
    return ListTile(
      leading: Icon(
        Icons.perm_device_info,
        size: 36,
      ),
      title: Text('Background Location Fetch Log'),
      subtitle: Text('History of recorded locations'),
      onTap: () {
        setState(() {
          currentWidget = BackgroundBetcher();
        });
        Navigator.pop(context);
      },
    );
  }

  UserAccountsDrawerHeader buildUserAccountsDrawerHeader() {
    return UserAccountsDrawerHeader(
      decoration: BoxDecoration(
        image: DecorationImage(
            image: AssetImage('images/wall.jpg'), fit: BoxFit.cover),
      ),
      accountName: MyStyle().titleH3(name),
      accountEmail: MyStyle().titleH3(email),
      currentAccountPicture: Image.asset('images/logo.png'),
    );
  }

  Column buildSignOut() {
    return Column(
      mainAxisAlignment: MainAxisAlignment.end,
      children: [
        ListTile(
          onTap: () async {
            await Firebase.initializeApp().then((value) async {
              await FirebaseAuth.instance.signOut().then((value) =>
                  Navigator.pushNamedAndRemoveUntil(
                      context, '/authen', (route) => false));
            });
          },
          tileColor: MyStyle().darkColor,
          leading: Icon(
            Icons.exit_to_app,
            color: Colors.white,
            size: 36,
          ),
          title: MyStyle().titleH2White('Sign Out'),
          subtitle: MyStyle().titleH3White('Sign Out & Go to Authen'),
        ),
      ],
    );
  }
}

Upvotes: 28

Views: 104901

Answers (7)

Antonin GAVREL
Antonin GAVREL

Reputation: 11219

If you are using a static make sure that it is not already initialized (singleton pattern with nullable variable) or removed the "static" keyword.

Switching from

static late final ScrollController scrollController;

to

 late final ScrollController scrollController;

got rid of my error.

Upvotes: 0

Muzammil Lone
Muzammil Lone

Reputation: 21

As i was facing the same problem i used the Future Builder the snapshot.data cant be null to handle this just use if block (snapshot.data==null) then return container with child cneter Text('Loading') until future completes screen will show loading and then will display dataSolution

Upvotes: 1

Younas
Younas

Reputation: 95

I had the same problem of lateInitializationError I find out to use ? to avoid it. if some one is facing this problem instead of late try ?.

For Example:

Gender? selectedGender;

Upvotes: 3

NirajPhutane
NirajPhutane

Reputation: 1906

For LateInitializationError, Simply use int? count; instead of late int count;

Upvotes: 3

Ojonugwa Jude Ochalifu
Ojonugwa Jude Ochalifu

Reputation: 27237

You should be checking for nullable for the variable name. So, Use:

String? name;

instead of:

late String name

Late means,

I promise I will initialize this variable later

but this promise doesn't mean a thing when using that variable inside the build method.

Upvotes: 59

Hlew
Hlew

Reputation: 7

I'm very new to flutter, but this worked for me.

@override
void initState() {
    // TODO: implement initState
    super.initState();

    findNameAndEmail().whenComplete(() {
        setState(() {});
    });
}

Upvotes: -1

hacker1024
hacker1024

Reputation: 3648

findNameAnEmail is an asynchronous method, so, while it's called in initState, Flutter does not wait for it to complete before build is called. This results in your late fields being accessed before they are set.

In order to wait for a Future to complete before building, consider using FutureBuilder.

Upvotes: 6

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