Tutorial - 10 - onClick , setText

http://www.youtube.com/watch?v=hUA_isgpTHI

http://blog.csdn.net/pku_android/article/details/7310877

http://androidbiancheng.blogspot.tw/2011/09/androidonclick-onclick.html

http://urakagi.blogspot.tw/2008/10/textviewsettext.html