CheckBox in Android Studio how to implement?

Question

Java

Hello. I searched on the site, but I did not get the exact answer. Can you tell me here:
There is an application. There is an additional screen to MainActivity, where there is a login, password and login \ register buttons. Connecting to the database, everything is fine with that. If a person registers, he automatically enters his profile. The issue is that it is not possible to implement checkbox with the server (to put it simply, the user's session is not saved). When you close the application and open it again, the login form crashes again. How to implement a checkbox (remember me) and pass that to the server? If there are any examples, I will be glad to any clarification.