使用registerReceiver注册BroadcastReceiver

public Intent registerReceiver (BroadcastReceiver receiver, IntentFilter filter) :
注册一个BroadcaseReceiver在主activity线程中运行，这个receiver只能够被主application线程中匹配filter的Intent唤醒执行；

unregisterReceiver(receiver)：注销receiver；
 
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原文地址：https://www.cnblogs.com/baorantHome/p/5839168.html