Could someone please explain me this?

Question

Hello community

I want to create an options menu item onClick listener to my root_preference screen in Android Studio but there are a couple of problems I am facing. I searched long on stackoverflow.com and fall along this answer.

https://stackoverflow.com/a/63731738

As a total beginner since 6 months, I don't understand the following:

MySharedPreferences.clearToken()
What does this do or what is mySharedPreferences?

How I can create an Action and where to put it?
R.id.action_logout

finish()
has an error in my Code. Why?

I am working in a Team of beginners and we all would be very happy if someone could help us with this problem online:

https://github.com/chatbot-devs/chatbot-help

Thank you very much
Julian