A broadcast receiver is implemented as a subclass of BroadcastReceiver and each broadcast is delivered as an Intent object.
一个broadcast receiver通过继承broadcastreceiver类来实现，每个broadcast被作为一个Intent对象发布。
A broadcast receiver is implemented as a subclass of BroadcastReceiver and each broadcast is delivered as an Intent object.
一个broadcast receiver通过继承broadcastreceiver类来实现，每个broadcast被作为一个Intent对象发布。
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