Instance member 'user' can't be accessed in an initializer

[Alvaro Gonzalez Rico]

Hello, I am trying to pass the user.uid from the NavigationPage to ProfilePage, but I get this error message: "The instance member 'user' can't be accessed in an initializer. Try replacing the reference to the instance member with a different expression". I am using the following code: 

class NavScreen extends StatefulWidget {

  @override

  _NavScreenState createState() => _NavScreenState();

}

class _NavScreenState extends State<NavScreen> {

  final user = FirebaseAuth.instance.currentUser;

  final List<Widget> _screens = [

    ProfileScreen(profileId: user.uid),

  ];

}

Any ideas on a possible solution? Thanks

[Suzuki Tomohiro]

How about “late final List<Widget> ...”?

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[Alvaro Gonzalez Rico]

Hello! With “late final List<Widget> ...” the problem mentioned above gets resolved, but "late" is underlined in red with the following error: "Unexpected text 'late'. Try removing the text."

[Suzuki Tomohiro]

The “late” keyword is available after Dart 2.12 (= Flutter 2.0)

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[Alvaro Gonzalez Rico]

Hello! I have Dart version 2.12.2 and Flutter version 2.0.4. Is the "late" keyword only available with a certain import?

[Alvaro Gonzalez Rico]

Hello! Do you have any recommendations? Thanks

[Suzuki Tomohiro]

I don’t know. Can you search why it doesn't work for you?

The document has it. https://dart.dev/null-safety/understanding-null-safety#lazy-initialization

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[Alvaro Gonzalez Rico]

According to (https://blog.gskinner.com/archives/2021/03/flutter-lazy-instantiation-with-the-late-keyword.html#:~:text=late%20has%20another%20great%20application,is%20referenced%20the%20first%20time.) it does not work for widget parameters. Look at "What about widget parameters?" section at bottom of page. If this is the case, what should I do?

[Suzuki Tomohiro]

Is  _screens a widget parameter now? I saw it wasn’t a parameter in a constructor.

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[Alvaro Gonzalez Rico]

I mean I have not modified anything. The ProfileScreen is still a widget. Maybe the problem is because _screens is a List of Widgets?

late final List<Widget> _screens = [

    ProfileScreen(profileId: user.uid),

  ];

[Suzuki Tomohiro]

Can you try the late keyword example works for you or not?

https://dart.dev/null-safety/understanding-null-safety#lazy-initialization

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[Alvaro Gonzalez Rico]

I will work on it and let you know. Thanks

[Alvaro Gonzalez Rico]

Hello, it has been a while. I have worked on the example from the site you gave me, and the late works still does NOT work. What should I do? Thanks

On Friday, April 30, 2021 at 9:44:59 AM UTC-4 suz...@gmail.com wrote:

[Suzuki Tomohiro]

> still does NOT work

Can you explain why it doesn’t work?

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