Android中ListView的下拉刷新
http://hi.baidu.com/glzlaohuai/item/931a293c957de6677d034b23
http://blog.csdn.net/nono_love_lilith/article/details/7100845
http://www.cnblogs.com/xiaoran1129/archive/2012/07/04/2576221.html
http://download.csdn.net/download/glzlaohuai/3893930
http://blog.csdn.net/linghu_java/article/details/6884276
http://code.google.com/p/pull-to-refresh-view/
http://blog.csdn.net/timchen6824/article/details/6852752
http://dengyin2000.iteye.com/blog/1187823
http://linglong117.blog.163.com/blog/static/277145472012112812812378/
https://github.com/johannilsson/android-pulltorefresh