안드로이드 다른 app 실행시키기 (android launch another application)

http://the-earth.tistory.com/entry/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-%EB%8B%A4%EB%A5%B8-%EC%95%B1-%EC%8B%A4%ED%96%89-%EC%8B%9C%ED%82%A4%EA%B8%B0


http://dodo4989.tistory.com/522