如果用户使用电子邮件和密码注册，则可以选择更新 displayName 和 photoUrl 用户.

If a user signed up using email and password, there is an option to update displayName and photoUrl of the user.

// Suppose currentUser is the logged in FirebaseUser

currentUser.updateProfile(
  UserUpdateInfo(
    displayName: 'name',
    photoUrl: '...',
  ),
),

如果从未执行过此操作，则 displayName 和 photoUrl 将返回 null

If this was never done displayName and photoUrl will return null

由于您在 users 集合中有数据，因此您将必须从该 document 中访问该数据，就像您访问其中的任何其他 document 消防站.

Since you have data in users collection you'll have to access that data from that document just like u access any other document in firestore.

一种更好的方法是在注册期间接受 displayName ，这样您就可以更新该用户的 displayName :

A better approach would be to accept displayName during sign up so that u can update displayName of that user:

FirebaseAuth.instance.createUserWithEmailAndPassword(
  email: 'an email',
  password: 'a password',
).then((newUser) {
  newUser.updateProfile(
    UserUpdateInfo(
      displayName: 'name',
    ),
  );
});

现在，您可以直接使用 currentUser.displayName 进行访问.

Now u can access using currentUser.displayName directly.