Destroy Android apps

I developed a working application

I have used some static variables and set application level variables. My problem is that even after setting () on each activity, the application will be displayed in run mode

After closing the application, when I start the application after a period of time, it will set the last change

How can I sabotage my application?

resolvent:

I think the correct answer is "you shouldn't"

It doesn't matter if your app is still running after users stop using it. Android will kill it if necessary

Your app probably doesn't even have an exit button