A broadcast receiver is a component that does nothing but receives and reacts to broadcast announcements. Many broadcasts originate in system code; for example, an announcement is made to indicate that the timezone has been changed or the battery power is low, that a picture has been taken, or that the user changed a language preference.
Apps can also initiate broadcasts. For example, an app may want to let other apps know that some data has finished downloading from the network to the device and is now available for them to use.
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