firebase - 某些代码可以帮助我吗？ Google登录Firebase(Flutter)

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当我选择要用于登录的帐户时，它将失败。我对出现的问题感到困惑，我逐步遵循了本教程。这段代码除外:

    final AuthCredential credential = GoogleAuthProvider.getCredential(
      accessToken: googleSignInAuthentication.accessToken,
      idToken: googleSignInAuthentication.idToken,
    );
    FirebaseUser firebaseUser = await firebaseAuth.signInWithCredential(credential);

因为signInWithGoogle无法正常工作。

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'home_everything.dart';

class login extends StatefulWidget {
  @override
  _loginState createState() => _loginState();
}

class _loginState extends State<login> {
  final GoogleSignIn googleSignIn = new GoogleSignIn();
  final FirebaseAuth firebaseAuth = FirebaseAuth.instance;
  SharedPreferences preferences;
  bool loading = false;
  bool isLogedin = false;

  @override
  void initState(){
    super.initState();
    isSignedIn();
  }

  void isSignedIn() async{
    setState(() {
      loading = true;
    });

    preferences = await SharedPreferences.getInstance();
    isLogedin = await googleSignIn.isSignedIn();
    if(isLogedin){
      Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => SongHome()));
    }

    setState(() {
      loading = false;
    });
  }
  Future handleSignIn() async{
    preferences = await SharedPreferences.getInstance();

    setState(() {
      loading = true;
    });

    GoogleSignInAccount googleUser = await googleSignIn.signIn();
    GoogleSignInAuthentication googleSignInAuthentication = await googleUser.authentication;
    final AuthCredential credential = GoogleAuthProvider.getCredential(
      accessToken: googleSignInAuthentication.accessToken,
      idToken: googleSignInAuthentication.idToken,
    );
    FirebaseUser firebaseUser = await firebaseAuth.signInWithCredential(credential);

    if(firebaseUser != null) {
      final QuerySnapshot result = await Firestore.instance.collection("users")
          .where("id", isEqualTo: firebaseUser.uid)
          .getDocuments();
      final List<DocumentSnapshot> documents = result.documents;
      if (documents.length == 0) {
// insert the user into out collection
        Firestore.instance.collection("users")
            .document(firebaseUser.uid)
            .setData({
          "id": firebaseUser.uid,
          "username": firebaseUser.displayName,
          "profilePicture": firebaseUser.photoUrl
        });
        await preferences.setString("id", firebaseUser.uid);
        await preferences.setString("username", firebaseUser.displayName);
        await preferences.setString("photoUrl", firebaseUser.displayName);
      } else {
        await preferences.setString("id", documents[0]['id']);
        await preferences.setString("username", documents[0]['username']);
        await preferences.setString("photoUrl", documents[0]['photoUrl']);
      }
      Fluttertoast.showToast(msg: "Logged In");
      setState(() {
        loading = false;
      });
      Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => SongHome()));
    }else{
      Fluttertoast.showToast(msg: "Login failed : (");
    }
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        centerTitle: true,
        title: new Text("Login", style: TextStyle(color: Colors.redAccent),),
        elevation: 0.5,
      ),
      body: Stack(
        children: <Widget>[
          Center(
            child: FlatButton(onPressed: (){
              handleSignIn();
            },
            child: Text("Sign In"),),
          ),
          Visibility(
            visible: loading ?? true,
            child: Container(
              color: Colors.white.withOpacity(0.7),
              child: CircularProgressIndicator(
                valueColor: AlwaysStoppedAnimation(Colors.red),
              ),
            ),
          )
        ],
      ),
    );
  }
}

这是错误日志:

E/flutter (15402): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null)

最佳答案

试试这个，

 FirebaseUser firebaseUser = await firebaseAuth.signInWithCredential(credential).user;

关于firebase - 某些代码可以帮助我吗？ Google登录Firebase(Flutter)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59185510/

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Answer 1

试试这个，

 FirebaseUser firebaseUser = await firebaseAuth.signInWithCredential(credential).user;