这就是说，不要从运行在后台的意图接收器（Intent Receiver）或服务（Service）中调用startActivity()，这样做会打断任何当前运行的应用程序，就会使用户很不舒服。
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Broadcast Intent Receiver 广播意图接收者 ; 接收广播通知
The integrity intent indicates the need for assurance that a message was not tampered with or altered during transmission between a sender and receiver.
完整性意图指示需要确保消息在发送方和接收方之间进行传输时未被篡改或修改。
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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