android Handler

http://fariytale.iteye.com/blog/1329186（handler计时）

http://wyk525.iteye.com/blog/1507548（几种计时机制）

http://wenku.baidu.com/view/85b339fa700abb68a982fbbd.html

http://topic.csdn.net/u/20110220/08/3a39c8a1-f6c5-49d8-b956-5ccdd06ca850.html

http://hi.baidu.com/foreverpains/blog/item/b231c9403b35c3039313c683.html

http://www.oschina.net/question/188162_45627

http://code.google.com/p/androidlearn/wiki/handler

http://www.2cto.com/kf/201105/89973.html

http://www.cnblogs.com/xitang/archive/2012/02/07/2341529.html