View.OnKeyListener
|_____onKey(View v, int keyCode, KeyEvent event)
|_____onTouch(View v, MotionEvent event)
View
|____Override__________onKeyDown(int, KeyEvent) 继承自KeyEvent.Callback
|_____________________onTouchEvent(MotionEvent)
第一种是EventListener
第二种是Override回调函数
原文：http://www.cnblogs.com/daishuguang/p/3718928.html