android viewpager + fragment

参考： 

http://blog.csdn.net/harvic880925/article/details/38660861

http://blog.csdn.net/guolin_blog/article/details/26365683

http://blog.csdn.net/singwhatiwanna/article/details/17201587

http://blog.csdn.net/singwhatiwanna/article/details/17201587