How to save and check whether a user exists in the application

Question

Hello today added FireBase auth to the application and I have a question. As when you exit the application, the account is saved and the next entrance to the program is not the login window, but the profile window

like so firebase.auth().onAuthStateChanged(функция, принимающая объект пользователя и обновляющая информацию о нём в приложении)
you would write that for android, but it’s not clear ... Under the android, you can get the current user like this: FirebaseAuth.getInstance().getCurrentUser();

How to save and check whether a user exists in the application

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