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Roadmap to becoming a developer in 2022
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developer-roadmap/src/data/roadmaps/android/content/103-app-components/103-broadcast-receiver.md

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Broadcast Receiver

Broadcast Receivers in Android are components that respond to system-wide broadcast announcements. They can be registered to respond to a specific type of broadcasts or implement a user-defined broadcast. While you can initiate a broadcast from your app, they are generally used for receiving system notifications or communicating with other applications. However, keep in mind that they cannot display a user interface, but they can start activities if necessary, which do have a user interface. A BroadcastReceiver class must override the onReceive() method where each message is received as an Intent object parameter.