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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；
使用registerReceiver注册BroadcastReceiver
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原文地址：http://www.cnblogs.com/baorantHome/p/5839168.html
