Android ViewPager sharedpreferences
http://www.cnblogs.com/dwinter/archive/2012/02/27/AndroidViewPager%E5%A4%9A%E9%A1%B5%E9%9D%A2%E6%BB%91%E5%8A%A8%E5%88%87%E6%8D%A2%E4%BB%A5%E5%8F%8A%E5%8A%A8%E7%94%BB%E6%95%88%E6%9E%9C.html
http://blog.csdn.net/alangdangjia/article/details/9054921
https://www.baidu.com/s?ie=utf-8&f=3&rsv_bp=0&rsv_idx=1&tn=baidu&wd=sharedpreferences&rsv_pq=ecce325a0000045d&rsv_t=0cf5eo0KJr39grC11juHDVR1e7sj6G%2FcvTMXkkd1SGsNjJw7AdcbaskMOCo&rsv_enter=1&rsv_sug3=8&rsv_sug1=7&rsv_sug2=1&prefixsug=shared&rsp=0&inputT=7923&rsv_sug4=8632