Anonymous Authentication

The name clearly states that the application allows users to access the application's features by providing a temporary anonymous identity. We need to enable anonymous login in the Firebase console. Next, the anonymousSignIn method calls the signInAnonymously() method of the FirebaseAuth instance:

public void anonymousSignIn() {
    FirebaseAuth.signInAnonymously()
            .addOnCompleteListener(this,
                    new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            if (!task.isSuccessful()) {
                                Toast.makeText(AnonAuthActivity.this,
                                        "Authentication failed. "
                                                + task.getException(),
                                        Toast.LENGTH_SHORT).show();
                            } else {
                                softButton.setText("Create an Account");
                                buttonMode = CREATE_MODE;
                            }
                        }
                    });
}