How do you connect a BroadcastReceiver to receive messages?

There are two methods:

1. Statically in the manifest:

   <application ...>
       <receiver android:name=".MyBroadcastReceiver">
           <intent-filter>
               <action android:name="com.example.MY_ACTION" />
               </intent-filter>
       </receiver>
   </application>
   

   — Created at application startup, even if it is not active. — Less flexible but reliable for system events.

2. Dynamically in code:

   // In an activity or service
   IntentFilter filter = new IntentFilter("com.example.MY_ACTION");
   MyBroadcastReceiver receiver = new MyBroadcastReceiver();
   registerReceiver(receiver, filter);
   
   // Don't forget to unregister when necessary
   // unregisterReceiver(receiver);
   

   — Created and registered at runtime. — More flexible, suitable for in-app events. — Must manually unregister to avoid memory leaks.