nav_test_1_4

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      initialRoute: SplashPage.routeName,
      routes: {
        SplashPage.routeName: (context) => SplashPage(),
        HomePage.routeName: (context) => HomePage(),
        LoginPage.routeName: (context) => LoginPage(),
        RegistryPage.routeName: (context) => RegistryPage(),
        ThirdPage.routeName: (context) => ThirdPage(),
      },
    );
  }
}

class SplashPage extends StatelessWidget {
  static const routeName = "splash";
  final String title;

  SplashPage({
    Key key,
    this.title,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Splash"),
        centerTitle: true,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            FlatButton(
              color: Colors.red,
              splashColor: Colors.green,
              onPressed: () {
                Navigator.pushReplacementNamed(
                  context,
                  LoginPage.routeName,
                );
              },
              child: Text("LoginPage"),
            ),
            FlatButton(
              color: Colors.red,
              splashColor: Colors.green,
              onPressed: () {
                Navigator.pushReplacementNamed(
                  context,
                  HomePage.routeName,
                );
              },
              child: Text("HomePage"),
            ),
          ],
        ),
      ),
    );
  }
}

class LoginPage extends StatelessWidget {
  static const routeName = "login";

  final String title;

  LoginPage({
    Key key,
    this.title,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => Navigator.of(context).pop(),
        ),
        title: Text("Login"),
        centerTitle: true,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            FlatButton(
              color: Colors.red,
              splashColor: Colors.green,
              onPressed: () {
                Navigator.pushNamed(
                  context,
                  RegistryPage.routeName,
                );
              },
              child: Text("RegistryPage"),
            ),
            FlatButton(
              color: Colors.red,
              splashColor: Colors.green,
              onPressed: () {
                Navigator.pushNamed(
                  context,
                  HomePage.routeName,
                );
              },
              child: Text("HomePage"),
            ),
          ],
        ),
      ),
    );
  }
}

class RegistryPage extends StatelessWidget {
  static const routeName = "registry";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => Navigator.of(context).pop(),
        ),
        title: Text("Registry"),
        centerTitle: true,
      ),
      body: Center(
        child: FlatButton(
          color: Colors.red,
          splashColor: Colors.green,
          onPressed: () {
            Navigator.pushNamedAndRemoveUntil(
              context,
              LoginPage.routeName,
              (Route<dynamic> route) => false,
            );
          },
          child: Text("LoginPage"),
        ),
      ),
    );
  }
}

class HomePage extends StatefulWidget {
  static const routeName = "home";

  final String title;

  HomePage({
    Key key,
    this.title,
  }) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int _index = 0;
  List<Widget> _pages = [
    FirstPage(),
    SecondPage(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _pages.elementAt(_index),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: _index,
        items: [
          BottomNavigationBarItem(
            icon: Icon(
              Icons.home,
            ),
            label: "First",
          ),
          BottomNavigationBarItem(
            icon: Icon(
              Icons.account_circle_outlined,
            ),
            label: "Second",
          ),
        ],
        onTap: (index) {
          setState(() {
            _index = index;
          });
        },

      ),
    );
  }
}

class FirstPage extends StatelessWidget {
  static const routeName = "first";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("First page"),
        centerTitle: true,
      ),
      body: Center(
        child: FlatButton(
          color: Colors.red,
          splashColor: Colors.green,
          onPressed: () {
            Navigator.pushNamedAndRemoveUntil(
              context,
              LoginPage.routeName,
              (Route<dynamic> route) => false,
            );
          },
          child: Text("LoginPage"),
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  static const routeName = "second";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Second page"),
        centerTitle: true,
      ),
      body: Center(
        child: FlatButton(
          color: Colors.red,
          splashColor: Colors.green,
          onPressed: () {
            Navigator.pushNamed(
              context,
              ThirdPage.routeName,
            );
          },
          child: Text("Third page"),
        ),
      ),
    );
  }
}

class ThirdPage extends StatelessWidget {
  static const routeName = "third";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
          icon: Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => Navigator.of(context).pop(),
        ),
        title: Text("Third page"),
        centerTitle: true,
      ),
      body: Center(
        child: FlatButton(
          color: Colors.red,
          splashColor: Colors.green,
          onPressed: () {
            Navigator.pushNamedAndRemoveUntil(
              context,
              LoginPage.routeName,
              (Route<dynamic> route) => false,
            );
          },
          child: Text("LoginPage"),
        ),
      ),
    );
  }
}