android에서 상하문Context의 의미

안드로이드 개발에서 Context라는 종류를 자주 사용하는데 원본 코드는 다음과 같다. 상하문은 응용 환경을 얻을 수 있는 인터페이스이고 Context를 통해 프로젝트의 작업 속성을 얻을 수 있다.

/**
 * 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.
 */
public abstract class Context {
    /**
     * File creation mode: the default mode, where the created file can only
     * be accessed by the calling application (or all applications sharing the
     * same user ID).
     * @see #MODE_WORLD_READABLE
     * @see #MODE_WORLD_WRITEABLE
     */