[안드로이드] context 설명 (링크)

https://possiblemobile.com/2013/06/context/

https://rejrecords.wordpress.com/2015/07/23/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C%EC%97%90%EC%84%9C-context%EB%9E%80-%EB%AC%B4%EC%97%87%EC%9D%BC%EA%B9%8C/

http://stackoverflow.com/questions/10347184/difference-and-when-to-use-getapplication-getapplicationcontext-getbasecon

http://arabiannight.tistory.com/entry/272