I don’t have any firsthand experience but judging from the API you can just write your own class that implements the Application.ActivityLifecycleCallbacks
interface and register that class on the provided Application
class instance
getApplicaton().registerActivityLifecycleCallbacks(yourCustomClass);
This class will receive the same callbacks as your individual activities. Good luck.
PS. This is API level 14 btw, so it won’t work on older phones.