broadcast receiver

基本解释

A broadcast receiver is a component that responds to system-wide broadcast announcements.
一個broadcast receiver是響應全系統廣播通知的一個組件。
A broadcast receiver is implemented as a subclass of BroadcastReceiver and each broadcast is delivered as an Intent object.
一個broadcast receiver通過繼承BroadcastReceiver類來實現，每個broadcast被作爲一個Intent對象發佈。
More commonly, though, a broadcast receiver is just a "gateway" to other components and is intended to do a very minimal amount of work.
但是，更常見的情況是，broadcast receiver衹作爲其他組件的“出入口”(gateway)，其本身做的工作非常少。