Firebase 身份验证和数据库 [英] Firebase Auth and Database

问题描述

我对 Firebase 有疑问，我是新手.我想在登录时返回用户名，但该名称在数据库中，我只想返回名称，当然，与身份验证中找到的电子邮件一致，该电子邮件也在数据库中.我的想法是将数据库中的电子邮件与身份验证进行比较，如果是真的，请给我名称.但我不知道如何开发它.解决方案?谢谢

I have a question with Firebase, I'm new to this. I would like to return the user's name when I login, but that name is in Database and I would like to return only the name, of course, coinciding with the email found in the authentication, which is also in the Database. The idea I have is to compare the email from the database with the Auth and if it is true, give me the name. But I would not know how to develop it. Solutions? Thank you

推荐答案

为了实现这一点，您需要使用如下所示的模型类:

In order to achieve this, you need to use a model class that looks like this:

public class UserModel implements Serializable {
    private String userEmail;
    private String userName;

    public UserModel() {}

    public UserModel(String userEmail, String userName) {
        this.userEmail = userEmail;
        this.userName = userName;
    }

    public String getUserEmail() {return userEmail;}
    public String getUserName() {return userName;}
}

要实际添加用户，请使用以下代码:

To actually add a user, please use the following code:

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
UserModel userModel = new UserModel("john@email,com", "John");
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("users");
usersRef.child(uid).setValue(userModel);

您的数据库结构将如下所示:

Your database structure will look like this:

Firebase-root
   |
   --- users
         |
         --- uid
              |
              --- userEmail: "john@email,com"
              |
              --- userName: "John"

此外，要取回userName，请使用以下代码:

Furthermore, to get back the userName, please use the following code:

DatabaseReference uidRef = usersRef.child(uid);
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        if(dataSnapshot.exists()) {
            String userName = dataSnapshot.child("userName").getValue(String.class);
            nombre.setText(userName);
            Log.d("TAG", userName);
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage());
    }
};
uidRef.addListenerForSingleValueEvent(eventListener);

如果您有兴趣，我还在我的一个教程中逐步解释了使用 Google 和 Firebase.

If you are interested, I have also exaplained in one of my tutorials step by step, the entire authentication process using Google and Firebase.

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