How to implement the start of a BroadcastReceiver in an Android application?

There are two main ways to work with BroadcastReceiver in Android:

1. Static registration in the manifest — added to AndroidManifest.xml. Such a receiver will receive broadcast messages even if the app is not running.

<receiver android:name=".MyBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

2. Dynamic registration in code — registered in an activity or service using registerReceiver(). Works only while the app is active.

BroadcastReceiver receiver = new MyBroadcastReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(receiver, filter);

The choice of method depends on the task: for system events that need to be caught always — static registration, for temporary ones — dynamic.