Android BroadcastReceiver Explained: How It Works

The Android BroadcastReceiver transmission mechanism is a form of inter-component communication within the Android system, used to pass messages and data between different components. When a broadcast event occurs, the system sends this event to all registered BroadcastReceivers with the corresponding broadcast filter, enabling communication between different components.

A BroadcastReceiver can be registered by declaring it in the AndroidManifest.xml file or dynamically through the Context.registerReceiver() method. When a broadcast event occurs, the system will choose the appropriate BroadcastReceiver to handle it based on the Intent category and filter matching rules.

Through the use of the BroadcastReceiver transmission mechanism, different components can trigger and respond to events, achieving decoupling and communication between components. Common use cases include listening and handling system broadcast events, passing messages within an application, and communicating messages between different applications.