Context

안드로이드 레퍼런스의 설명만으로 정리가 되어 버린다.

Interface to global information about an application environment.
This is an abstract class whose implementation is provided by the Android system. It allows access to application-specific resources and classes, as well as up-calls for application-level operations such as launching activities, broadcasting and receiving intents, etc.

왜 진작 찾아 보지 않았는지.. Activity든 Service든 Context를 간접적으로 상속받고 있다.