Learning Objective: Let’s Create a Login Screen and on submit button click move to next Screen.
class MyLoginPage extends StatefulWidget {
const MyLoginPage({super.key, required this.title});
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
State<MyLoginPage> createState() => _MyLoginPageState();
}
class _MyLoginPageState extends State<MyLoginPage> {
String _url = "";
void _loginvalidate() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
//_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also a layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextFormField(
decoration: const InputDecoration(
border: UnderlineInputBorder(),
labelText: 'Enter your username',
),
),
TextFormField(
obscureText: true,
decoration: const InputDecoration(
labelText: 'Password',
),
),
TextButton(
style: ButtonStyle(
foregroundColor: MaterialStateProperty.all<Color>(Colors.blue),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const MyHomePage(title: "Welcome")),
);
},
child: Text('Submit'),
)
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: null,
tooltip: 'Increment',
child: const Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
My Input TextBox Code
TextFormField(
decoration: const InputDecoration(
border: UnderlineInputBorder(),
labelText: 'Enter your username',
),
),My Password Text Input Code
TextFormField(
obscureText: true,
decoration: const InputDecoration(
labelText: 'Password',
),
),Button with Button Click (Navigator)
TextButton(
style: ButtonStyle(
foregroundColor: MaterialStateProperty.all<Color>(Colors.blue),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const MyHomePage(title: "Welcome")),
);
},
child: Text('Submit'),
)