在Flutter中保存登录Google时出错 [英] Getting error while saving sign in google in Flutter
本文介绍了在Flutter中保存登录Google时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在学习firebase身份验证和google登录.在这里，我准备了一个应用程序，将在其中进行google登录并保存登录数据，直到用户注销帐户为止.但是我遇到了错误，请解决此问题，我无法在任何地方找到它.
I am learning firebase auth and google sign in. Here, I have prepared an app in which I will do google sign in and save the sign-in data till users sign out the account. But I am getting an error please solve this I am not able to find it anywhere.
import 'package:CovidTracker/Auth/authentication.dart';
import 'package:CovidTracker/Auth/chatRoom.dart';
import 'package:CovidTracker/constraints.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
class SignInScreen extends StatefulWidget {
@override
_SignInScreenState createState() => _SignInScreenState();
}
Constraints color = new Constraints();
class _SignInScreenState extends State<SignInScreen> {
@override
Widget build(BuildContext context) {
return FutureBuilder<User>(
future: FirebaseAuth.instance.currentUser,
builder: (context, snapshot) {
if (snapshot.hasData) {
User user = snapshot.data;
return ChatRoom(uid: user.uid);
} else {
return Column(
children: [
SizedBox(
height: 30.0,
),
Container(
height: 180,
width: MediaQuery.of(context).size.width - 30,
decoration: new BoxDecoration(
color: color.cardActiveBg,
borderRadius: new BorderRadius.all(Radius.circular(30.0)),
),
child: Row(
children: [
Image.asset(
'assets/images/chat.png',
height: 170.0,
),
Padding(
padding: const EdgeInsets.only(top: 30.0, left: 15.0),
child: Column(
children: [
Text(
'SignIn',
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: 'Poppins',
fontSize: 28.0),
),
Text(
'To Chat',
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: 'Poppins',
fontSize: 30.0),
),
],
),
),
],
),
),
SizedBox(
height: 20.0,
),
Center(
child: Image.asset(
'assets/images/googleLogo.png',
height: 100.0,
),
),
SizedBox(
height: 20.0,
),
InkWell(
onTap: () => googleSignInAcc().whenComplete(() async {
User user = await FirebaseAuth.instance.currentUser;
Navigator.of(context).pushReplacement(MaterialPageRoute(
builder: (_) => ChatRoom(uid: user.uid)));
}),
child: Container(
width: MediaQuery.of(context).size.width / 1.3,
height: 60.0,
decoration: new BoxDecoration(
borderRadius: new BorderRadius.circular(50.0),
color: color.primary),
child: Row(
children: [
SizedBox(
width: 20.0,
),
Image.asset(
'assets/images/googleLogo.png',
height: 45.0,
),
SizedBox(
width: 20.0,
),
Text(
'Sign in with Google',
style: new TextStyle(
fontSize: 17.0,
fontWeight: FontWeight.bold,
),
),
],
),
),
),
],
);
}
},
);
}
}
但是我在此行中遇到错误
future: FirebaseAuth.instance.currentUser,
是说
The argument type 'User' can't be assigned to the parameter type 'Future<User>'.
Google登录代码在这里
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:google_sign_in/google_sign_in.dart';
FirebaseAuth auth = FirebaseAuth.instance;
final googleSignIn = GoogleSignIn();
//error handling dialog box
showErrorDialog(BuildContext context, String err) {
FocusScope.of(context).requestFocus(new FocusNode());
return showDialog(
context: context,
child: AlertDialog(
title: Text(
"Error Occured",
),
content: Text(err),
actions: [
OutlineButton(
child: Text("OK"),
onPressed: () => Navigator.pop(context),
),
],
),
);
}
Future<bool> googleSignInAcc() async {
GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
if (googleSignInAccount != null) {
GoogleSignInAuthentication googleSignInAuthentication =
await googleSignInAccount.authentication;
AuthCredential credential = GoogleAuthProvider.credential(
idToken: googleSignInAuthentication.idToken,
accessToken: googleSignInAuthentication.accessToken);
UserCredential result = await auth.signInWithCredential(credential);
User user = await auth.currentUser;
print(user.uid);
return Future.value(true);
}
}
Future<bool> signOutUser() async {
User user = await auth.currentUser;
await googleSignIn.disconnect();
return Future.value(true);
}
希望这足以解释问题.请解决这个问题，我被困住了，解决问题的唯一方法就是通过你们.希望您能帮助学习这个新手.非常感谢(:)
Hope this is enough to explain the question. Please solve this I am stuck and the only way to get it solved is through you guys. Hope you will help to learn this newbie. Thank You So Much(:)
推荐答案
当我编写未来的构造函数时.我总是使用AsyncSnapshot类.
When I program a future constructor. I always use an AsyncSnapshot class.
在您的代码中:
builder: (context, snapshot) {
if (snapshot.hasData) {
User user = snapshot.data;
尝试:
builder: (context, AsyncSnaphot<User> snapshot) {
if (snapshot.hasData) {
User user = snapshot.data;
这篇关于在Flutter中保存登录Google时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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