Android应用程序注册广播接收器registerReceiver

MainActivity调用registerReceiver函数来注册广播接收器：

public class MainActivity extends Activity implements OnClickListener {
......

@Override
public void onResume() {
super.onResume();

IntentFilter counterActionFilter = new IntentFilter(CounterService.BROADCAST_COUNTER_ACTION);
registerReceiver(counterActionReceiver, counterActionFilter);
}

......

}MainActivity在onResume函数里，通过其父类ContextWrapper的registerReceiver函数注册了一个BroadcastReceiver实例counterActionReceiver，并且通过IntentFilter实例counterActionFilter告诉ActivityManagerService，它要订阅的广播是CounterService.BROADCAST_COUNTER_ACTION类型的，这样，ActivityManagerService在收到CounterService.BROADCAST_COUNTER_ACTION类型的广播时，就会分发给counterActionReceiver实例的onReceive函数。

参考：

http://blog.csdn.net/luoshengyang/article/details/6737352