android - Android中的广播接收器有什么用？

Question

谁能说出 BroadcastReceiver 的用途并在 Android 中举个例子？

有人可以使用 BroadcastReceiver 给出时区更改示例吗？

Answer 1

我认为 android 开发者文档解释得很好:

A broadcast receiver is a component that does nothing but receive and react to broadcast announcements. Many broadcasts originate in system code — for example, announcements that the timezone has changed, that the battery is low, that a picture has been taken, or that the user changed a language preference. Applications can also initiate broadcasts — for example, to let other applications know that some data has been downloaded to the device and is available for them to use.

(参见 developer.android.com)

在您的 Android 系统上，广播用作通知工具。顾名思义，它们通过您的整个系统进行广播。使用广播接收器，您可以捕获这些广播通知。