android - 从登录 Activity 中忘记了 firebase 的密码

Question

查看文档，我刚刚发现:

FirebaseAuth auth = FirebaseAuth.getInstance();
String emailAddress = "user@example.com";

auth.sendPasswordResetEmail(emailAddress)
        .addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    Log.d(TAG, "Email sent.");
                }
            }
        });

我有一个问题，因为我需要在登录 Activity 中实现忘记密码功能，其中 FirebaseAuth 为空，因为用户未登录，那么我该如何解决？

Answer 1

FirebaseAuth.getInstance() 方法永远不会返回 null，因此您的代码可以正常工作。

如果用户未登录，FirebaseAuth.getInstance().getCurrentUser() 方法将返回 null。

来自Android Firebase Authentication getting started documentation :

Declare an instance of FirebaseAuth

private FirebaseAuth mAuth;

In the onCreate() method, initialize the FirebaseAuth instance.

mAuth = FirebaseAuth.getInstance();

When initializing your Activity, check to see if the user is currently signed in.

@Override
public void onStart() {
    super.onStart();
    // Check if user is signed in (non-null) and update UI accordingly.
    FirebaseUser currentUser = mAuth.getCurrentUser();
    updateUI(currentUser);
}

您问题中的代码来自 send a password reset section :

You can send a password reset email to a user with the sendPasswordResetEmail method. For example:

FirebaseAuth auth = FirebaseAuth.getInstance();
String emailAddress = "user@example.com";

auth.sendPasswordResetEmail(emailAddress)
        .addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    Log.d(TAG, "Email sent.");
                }
            }
        });

这里指定了emailAddress变量，因为用户没有登录。