How can I retrieve the email for Firebase authentication in an Android app?

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To retrieve the email for Firebase authentication in an Android app, you can use the following code:

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
    String email = user.getEmail();
    // Use the email string here
}

This code first gets the current Firebase user, and then checks if the user is not null. If the user is not null, it retrieves the email of the user using the getEmail() method and stores it in a string variable. You can then use the email string as needed.