Android passes the firebase auth object to another activity to exit

I log in to the user in the main activity, but I want to log out of the user in another activity through the button. However, I can't pass the firebaseauth object to other activities

Putparcel and putserializable don't work because I can't control the class itself. Sharing preferences only accept the original type. Should I get a new instance in the new activity and log off the user in the new activity? Even if I get a new instance, will the user's state be preserved?

This is the code

mAuth = FirebaseAuth.getInstance();
        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
                    Toast.makeText(getApplicationContext(), "You are logged in!!!",
                            Toast.LENGTH_SHORT).show();
                    Intent intent = new Intent(MainActivity.this, CameraActivity.class);

                    startActivity(intent);
                } else {
                    // User is signed out
                    Log.d(TAG, "onAuthStateChanged:signed_out");
                }

            }
        };

resolvent:

Firebase auth is a singleton class. You can get an instance of firebase auth from anywhere in the application

You just need to add

 mAuth=FirebaseAuth.getInstance();
  // Firebase sign out
  mAuth.signOut();

Or a simple way

.FirebaseAuth.getInstance()signOut();