android UI进阶之用ViewPager实现欢迎引导页面http://blog.csdn.net/notice520/article/details/7454568
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android 按两次返回键退出 http://blog.csdn.net/ganlijianstyle/article/details/7937015
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http://www.androiduipatterns.com/2011/10/free-android-ui-library-component.html
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https://github.com/johannilsson/android-pulltorefresh
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https://github.com/pakerfeldt/android-viewflow
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Creating a Multi Select List Preference http://mjsoftwaretechnique.blogspot.com/2013/04/creating-multi-select-list-preference.html
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http://blog.csdn.net/wjky2014/article/details/8425202
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[Android实例] viewflow实现类似淘宝，网易新闻的横幅banner，可循环自动播放
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http://blog.csdn.net/sam_zhang1984/article/details/8079955