10. 참조 및 계산기 소스
O TableLayout
http://developer.android.com/reference/android/widget/TableLayout.html
O Landscape XML
http://developer.android.com/training/basics/supporting-
devices/screens.html
O onSaveInstanceState
http://sonseungha.tistory.com/268
O AutoResizeTextView
https://github.com/AndroidDeveloperLB/AutoFitTextView
O SoundPool
http://developer.android.com/reference/android/media/SoundPool.html
O 버튼 효과음
http://soundbible.com/suggest.php?q=click&x=0&y=0
O 어플 아이콘
https://www.iconfinder.com
O 계산기 소스 공유(Github)
https://github.com/tadoya/calculator