깨달음 (2016.12.30)

• View.getContext(): Returns the context the view is currently running in. Usually the currently active Activity.

• 현재 액티비티

• Activity.getApplicationContext(): Returns the context for the entire application (the process all the Activities are running inside of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, not just the current Activity.

• 전체 애플리케이션, 생명주기에 관련되어있을때 씀.

• ContextWrapper.getBaseContext(): If you need access to a Context from within another context, you use a ContextWrapper. The Context referred to from inside that ContextWrapper is accessed via getBaseContext().

• 다른 컨텍스트에서 접근할때 컨텍스트래퍼 씀.

@Module	Used on classes which contains methods annotated with @Provides.
@Provides	Can be used on methods in classes annotated with @Module and is used for methods which provides objects for dependencies injection.
@Singleton	Single instance of this provided object is created and shared.
@Component	Used on an interface. This interface is used by Dagger 2 to generate code which uses the modules to fulfill the requested dependencies.