http://actionbarsherlock.com/
https://github.com/tjerkw/Android-SlideExpandableListView
http://blog.csdn.net/sunboy_2050/article/details/8882236
http://www.csdn.net/article/2013-05-06/2815145-Android-open-source-projects-two
https://github.com/chrisbanes/Android-PullToRefresh