Classes such as a BroadcastReceiver define code that will execute when external events trigger them.
诸如broadcastreceiver这样的类定义的代码将在外部事件触发它们时执行。
A broadcast receiver is implemented as a subclass of BroadcastReceiver and each broadcast is delivered as an Intent object.
一个broadcastreceiver通过继承broadcastreceiver类来实现，每个broadcast被作为一个Intent对象发布。
If set, when sending a broadcast only registered receivers will be called — no BroadcastReceiver components will be launched.
如果发送广播时设置了这个标志，那只会调用注册了的接收器——BroadcastReceiver组件不会被启动。
If set, when sending a broadcast only registered receivers will be called — no BroadcastReceiver components will be launched.
如果发送广播时设置了这个标志，那只会调用注册了的接收器——BroadcastReceiver组件不会被启动。
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