Android多线程安全：
https://blog.csdn.net/SenchunHuang/article/details/88052196
Runnable和Thread的区别：
https://www.jianshu.com/p/9c9a11092f26
多线程同步：
https://www.jianshu.com/p/6f98f03430eb
主线程
https://www.jianshu.com/p/35825340f4e5
Handler
https://blog.csdn.net/songzi1228/article/details/82835982
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