此页面中的语法错误未定义命名参数“ accessToken”

如何解决此页面中的语法错误未定义命名参数“ accessToken”

该页面有什么错误，我不知道如何解决？此页面中的语法错误-

未定义命名参数“ accessToken”。尝试更正名称到现有命名参数的名称，或定义一个命名名为'accessToken'.dartundefined_named_parameter的参数。

在此页行号中显示此类型的错误：-'190'

 if(result.status == FacebookLoginStatus.loggedIn) {
            final AuthCredential credential = FacebookAuthProvider.getCredential(
              accessToken: result.accessToken.token,);

main.dart

import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter_facebook_login/flutter_facebook_login.dart';
import 'package:google_sign_in/google_sign_in.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,),home: MyHomePage(title: 'Firebase Authentication.'),);
   }
  }

 class MyHomePage extends StatefulWidget {
 MyHomePage({Key key,this.title}) : super(key: key);

 final String title;

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

class _MyHomePageState extends State<MyHomePage> {

 final emailTextController = TextEditingController();
 final passwordTextController = TextEditingController();

 @override
 void dispose() {
  emailTextController.dispose();
  passwordTextController.dispose();
  super.dispose();
 }

 @override
 Widget build(BuildContext context) {
 return Scaffold(
   appBar: AppBar(
     backgroundColor: Colors.green,title: Text(
         widget.title,body: Center(
    child: Column(
      mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
        SizedBox(
          width: 360,child: TextFormField(
            validator: (input) {
              if(input.isEmpty) {
                return 'Please type an email';
              }
            },decoration: InputDecoration(
                labelText: 'Email'
            ),controller: emailTextController,SizedBox(
          width: 360,child: TextFormField(
            obscureText: true,validator: (input) {
              if(input.isEmpty) {
                return 'Please type an password';
              }
            },decoration: InputDecoration(
                labelText: 'Password'
            ),controller: passwordTextController,SizedBox(height: 20),child: RaisedButton(
            child: Row(
              children: <Widget>[
                Icon(Icons.mail,size: 30),Text(
                  '  Sign up with Email',style: TextStyle(fontSize: 28),],textColor: Colors.white,color: Colors.red[400],padding: EdgeInsets.all(10),onPressed: () {
              signUpWithMail();
            },child: RaisedButton(
            child: Row(
              children: <Widget>[
                Icon(Icons.thumb_up,Text(
                  '  Sign up with Facebook',color: Colors.blue[900],onPressed: () {},//   signUpWithFacebook();
            // },child: RaisedButton(
            child: Row(
              children: <Widget>[
                Icon(Icons.toys,Text(
                  '  Sign up with Google',textColor: Colors.black,color: Colors.white,onPressed: () {
              _googleSignUp();
            },);
  }

 Future<void> _googleSignUp() async {
 try {
  final GoogleSignIn _googleSignIn = GoogleSignIn(
    scopes: [
      'email'
    ],);
  final FirebaseAuth _auth = FirebaseAuth.instance;

  final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
  final GoogleSignInAuthentication googleAuth = await googleUser.authentication;

  final AuthCredential credential = GoogleAuthProvider.getCredential(
    accessToken: googleAuth.accessToken,idToken: googleAuth.idToken,);

  final FirebaseUser user = (await _auth.signInWithCredential(credential)).user;
  print("signed in " + user.displayName);

   return user;
  }catch (e) {
   print(e.message);
  }
 }

Future<void> signUpWithFacebook() async{
try {
  var facebookLogin = new FacebookLogin();
  var result = await facebookLogin.logIn(['email']);

  if(result.status == FacebookLoginStatus.loggedIn) {
    final AuthCredential credential = FacebookAuthProvider.getCredential(
      accessToken: result.accessToken.token,);
    final FirebaseUser user = (await FirebaseAuth.instance.signInWithCredential(credential)).user;
    print('signed in ' + user.displayName);
     return user;
   }
  }catch (e) {
    print(e.message);
  }
}

Future<void> signUpWithMail() async {
 try {
  await FirebaseAuth.instance.createUserWithEmailAndPassword(
      email: emailTextController.text,password: passwordTextController.text
  );
  showDialog(
      context: context,builder: (context) {
        return AlertDialog(
          content: Text('Success sign up'),);
    }
  );
 }catch(e) {
   print(e.message);
   showDialog(
      context: context,builder: (context) {
        return AlertDialog(
          content: Text(e.message),);
      }
    );
   }

  }
}

pubspec.yaml

name: ProLogin
description: A new Flutter project.

# The following line prevents the package from being accidentally published to
# pub.dev using `pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots,like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number,respectively.
# In Android,build-name is used as versionName while build-number used as 
versionCode.
# Read more about Android versioning at 
https://developer.android.com/studio/publish/versioning
# In iOS,build-name is used as CFBundleShortVersionString while build-number 
used as CFBundleVersion.
# Read more about iOS versioning at
#

https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html 版本：1.0.0 + 1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.3
  form_field_validator: ^1.0.1
  firebase_auth: ^0.18.0+1
  cloud_firestore: "^0.14.0+2"
  firebase_core: "0.5.0"
  flutter_widgets: ^0.1.12
  google_sign_in: ^4.5.3
  flutter_facebook_login: ^3.0.0

dev_dependencies:
  flutter_test:
    sdk: flutter

# For information on the generic Dart part of this file,see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application,so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application,add an assets section,like this:
  assets:
      - assets/signin.png/
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants",see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies,see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application,add a fonts section here,# in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name,and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,# see https://flutter.dev/custom-fonts/#from-packages

此页面中的语法错误未定义命名参数“ accessToken”

如何解决此页面中的语法错误未定义命名参数“ accessToken”

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