从 Firebase 颤振中检索数据时出错

Question

我已完成 Google 登录选项，但无法检索注册的 Google 帐户的详细信息。

这是我的代码：

凭证参数有问题，下面是我的问题截图

Future<String> signInWithGoogle() async {
  String name;
  String email;
  String imageUrl;
  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;


//  final FirebaseUser userDetails =
//  (await _auth.signInWithCredential(credential)).user;
//// Add the following lines after getting the user
//// Checking if email and name is null
//  assert(userDetails.email != null);
//  assert(userDetails.displayName != null);
//  assert(userDetails.photoUrl != null);
//  name = userDetails.displayName;
//  email = userDetails.email;
//  imageUrl = userDetails.photoUrl;
//// Only taking the first part of the name, i.e., First Name
//  if (name.contains(" ")) {
//    name = name.substring(0, name.indexOf(" "));
//  }


  final GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
  final GoogleSignInAuthentication googleSignInAuthentication =
  await googleSignInAccount.authentication;

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

  final AuthResult authResult = await _auth.signInWithCredential(credential);
  final FirebaseUser user = authResult.user;

  assert(!user.isAnonymous);
  assert(await user.getIdToken() != null);

  final FirebaseUser currentUser = await _auth.currentUser();
  assert(user.uid == currentUser.uid);

  return 'signInWithGoogle succeeded: $user';
}

Answer 1

你代码中的变量credentials是未定义的，应该是这样的：

Future<FirebaseUser> _handleSignIn() async {
  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;
}

首先获取credentials，然后将变量作为参数添加到signinwithcredential

---

尝试以下方法：

Future<String> signInWithGoogle() async {
  String name;
  String email;
  String imageUrl;

//  final FirebaseUser userDetails =
//  (await _auth.signInWithCredential(credential)).user;
//// Add the following lines after getting the user
//// Checking if email and name is null
//  assert(userDetails.email != null);
//  assert(userDetails.displayName != null);
//  assert(userDetails.photoUrl != null);
//  name = userDetails.displayName;
//  email = userDetails.email;
//  imageUrl = userDetails.photoUrl;
//// Only taking the first part of the name, i.e., First Name
//  if (name.contains(" ")) {
//    name = name.substring(0, name.indexOf(" "));
//  }


  final GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
  final GoogleSignInAuthentication googleSignInAuthentication =
  await googleSignInAccount.authentication;

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

  final AuthResult authResult = await _auth.signInWithCredential(credential);
  final FirebaseUser user = authResult.user;

  assert(!user.isAnonymous);
  assert(await user.getIdToken() != null);

  final FirebaseUser currentUser = await _auth.currentUser();
  assert(user.uid == currentUser.uid);

  return 'signInWithGoogle succeeded: $user';
}