这是一个AndroidBroadcastReceiver测试程序，从中读者可以学习到如何使用一般、有序、异步广播。及编写自定义的ＭyBroadcast文件。-This is a AndroidBroadcastReceiver test program, from which readers can learn how to use normal, orderly, and asynchronous broadcast. And write custom MyBroadcast file.