http://www.runoob.com/w3cnote/android-tutorial-handler-message.html
https://blog.csdn.net/lowprofile_coding/article/details/72496065
https://blog.csdn.net/lowprofile_coding/article/details/72580044
https://www.cnblogs.com/fuck1/p/5513412.html
原文：https://www.cnblogs.com/eustoma/p/10197686.html