Android application

Lifecycle. Defines an object that has an Android Lifecycle . LifecycleRegistry. An implementation of Lifecycle that can handle multiple observers.

Android service is a component that is used to perform operations on the background such as playing music, handle network transactions, interacting content providers etc. It doesn’t has any UI (user interface). The service runs in the background indefinitely even if application is destroyed .

There are seven methods that manage the life cycle of an Android application: onCreate() onStart() onResume()