FlutterTute

Firstly add google_sign_in dependencies in your pubspac.yaml file   Then add internet permission in your androidManifest.xml file Then write your code in main.dart import 'package:flutter/material.dart' ; import 'package:google_sign_in/google_sign_in.dart' ; GoogleSignIn _googleSignIn = GoogleSignIn(scopes: [ 'profile' , 'email' ]); void main() => runApp(MaterialApp(   debugShowCheckedModeBanner: false ,   title: 'Google Sign in' ,   home: SignInDemo(), )); class SignInDemo extends StatefulWidget {   @override   _SignInDemoState createState() => _SignInDemoState(); } class _SignInDemoState extends State<SignInDemo> {   GoogleSignInAccount _currentUser;   @override   void initState() {     super .initState();     _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account){       setState(() {       ...