keyboard IME 직접만들기~ 유용한 unicode 랑 관련 android api 모음

https://developer.android.com/guide/topics/text/creating-input-method.html

https://developer.android.com/reference/android/view/inputmethod/InputConnection.html#getSelectedText(int)

http://unicode-table.com/en/3134/

https://developer.android.com/reference/android/view/MotionEvent.html#getActionMasked()

http://hanpsy.tistory.com/2

http://mwultong.blogspot.com/2008/02/16-2-10-8-hex-calc.html