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import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Login(),
    );
  }
}

class Login extends StatefulWidget {
  LoginState createState() => LoginState();
}

class LoginState extends State<Login> {
  GlobalKey<ScaffoldState> scaffold = GlobalKey();

  final _formKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        key: scaffold,
        appBar: AppBar(
          title: Center(
            child: Text('Login Screen'),
          ),
        ),
        drawer: Drawer(),
        body: Form(
          key: _formKey,
          child: ListView(children: [
            Container(
                alignment: Alignment.center,
                child: TextFormField(
                  decoration: InputDecoration(labelText: 'Enter the Username'),
                )),
            Container(
                alignment: Alignment.center,
                child: TextFormField(
                  validator: (value) {
                    if (value == null) {
                      return null;
                    }
                    if (value.length < 8) {
                      return "Password length should be 8";
                    }
                  },
                  decoration: InputDecoration(labelText: 'Enter the Password'),
                )),
           ]),
        ));
  }
}