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android broadcast 优先级 https://blog.csdn.net/ritterliu/article/details/17025183 https://yangguangfu.iteye.com/blog/1063732 https://www.cnblogs.com/youjun/archive/2012/03/21/2410644.html
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https://www.vogella.com/tutorials/AndroidNotifications/article.html
- https://ke.qq.com/cgi-bin/courseDetail?course_id=63896#
- https://pnmooc.ke.qq.com/
- https://www.imooc.com/view/345
- https://blog.csdn.net/fjseryi/article/details/12677803
- https://www.javaworld.com/article/2077322/core-java/core-java-sockets-programming-in-java-a-tutorial.html