How can I pass data from a TextFieldInput to another Page with Provider

Question

I want to pass the Data (String) from a TextField to a second Page with Provider after I clicked the Button.

Here is my code

Answer 1

Update your name_provider class

class NameProvider extends ChangeNotifier {
  String _name = "";

  String get getName => _name;

  saveName(String name) {
    _name = name;
    notifyListeners();
  }
}

The name variable was made private to avoid getting wrong result while calling the function.

Now this edit was made to main.dart file

class _MyHomePageState extends State<MyHomePage> {
  String name = "";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Padding(
        padding: const EdgeInsets.all(20),
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'Please enter your name',
              ),
              TextField(
                onSubmitted: (value) {
                  setState(() {
Provider.of<NameProvider>(context).saveName(value);
                  });
                },
                onChanged: (value) {
                  setState(() {
                    name = value;
                  });
                },
              ),
              Text("Name: $name"),
              TextButton(
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (context) => const SecondPage(),
                    ),
                  );
                },
                child: const Text("To Second Page"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Now getting name in SecondPage:

class SecondPage extends StatelessWidget {
  const SecondPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Second Page"),
      ),
      body: Padding(
        padding: const EdgeInsets.all(20),
        child: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: const [
              Text(
                "Name:",
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
              ),
              Text(
                
                Provider.of<NameProvider>(context).getName,
                style: TextStyle(fontSize: 32),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

If there is some sort of expected string but got... error, replace getName with '${Provider.of<NameProvider>(context).getName}'

Let us know if this solution works