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logged
  ? Text(
      'The user is logged!',
      style: TextStyle(
        color: Colors.blue,
      ),
    )
  : Text(
      'The user is not logged!',
      style: TextStyle(

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logged ? RaisedButton(
  child: Text('Logout'),
  color: Colors.red[300],
  onPressed: () async {
    try {
      await _auth.signOut();
      setState(() {
        logged = false;
      });
    } catch (e) {

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logged ? Container() : RaisedButton(
  child: Text('Login'),
  color: Colors.blue[300],
  onPressed: () async {
    try {
      _user = await _auth.signInWithEmailAndPassword(
        email: '[email protected]',
        password: 'password',
      );
      setState(() {

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@override
void initState() {
  super.initState();
  _auth.currentUser().then((response) {
    print(response.uid);
    if (response.uid != null) {
      setState(() {
        logged = true;
      });
    }

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class _MyHomePageState extends State<MyHomePage> {
  bool logged = false;

  FirebaseUser user;
  final FirebaseAuth _auth = FirebaseAuth.instance;
  
  [...]
}

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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

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import 'package:flutter/material.dart';

class ViewB extends StatelessWidget {

  final String message;

  ViewB({Key key, this.message}) : super(key: key);

  @override
  Widget build(BuildContext context) {

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child: RaisedButton(
  onPressed: () => Navigator.pushNamed(context, '/view_b', arguments: {
        'message': 'Hello User 😄',
      }),
  color: Colors.green,
  child: Text(
    'Goto View B',
    style: TextStyle(
      color: Colors.white,
    ),

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import 'package:flutter/material.dart';

class ViewB extends StatelessWidget {

  final String message;

  ViewB({Key key, this.message}) : super(key: key);

  @override
  Widget build(BuildContext context) {

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onPressed: () => Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) => ViewB(
      message: 'Hello User :)',
    ),
  ),
),