android - How to set onBackButton listener to an activity

Question

I have a Class A which runs activity via startActivityForResult by passing Intent to it. In other class, lets say B I get this Intent and recreate activity by it. How can I listen events for that activity, e.g. activity which was started for result is running and user pressed "back" button so I want to do some action. How can I do this? Thank you on advance.

Activity in which i recreate instance of object is not derived from Activity class. It is just ACTIVITY. So I have only object. is there any way to do such stuff with instance of class but not a class?

Answer 1

You should override the method : onBackPressed() of the Activity class.