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Flutter Tutorial Day 2

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'),
            )
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