How to Identify the Button Pressed During Screen Transition in Android

startActivityForResult(Intent,int) and onActivityResult(Intent,CharSequence). What do you think?

If multiple configuration state retrieval is required, create a class that inherits the application class and
It is easy to implement if you treat it as a global variable that can be viewed from any screen.
Or create a service and let it run in the background. You can also remember the settings when the screen disappears.

If you want to use Intent to transition the screen again from child activity, when calling the parent

Intent==newIntent(getApplicationContext(), xxxx.class);
boolean 
int.putExtra("VALUE1", value1);
int.putExtra("VALUE2", value2);
startActivity(i);

I think it is also possible to pass it as an argument to the screen that starts like above.
The boot side is either onCreate or onResume and getExtra.
The type passed as an argument can be either an integer or a string.