title: How to convert a GCM Intent Service to Firebase
body: <p>I'm migrating an old app from GCM to FCM and I have converted most things but I get to this service and I'm at a little bit of a loss to how I should proceed--I'm finding nothing in the migration documentation (<a href="https://developers.google.com/cloud-messaging/android/android-migrate-fcm" rel="nofollow noreferrer">https://developers.google.com/cloud-messaging/android/android-migrate-fcm</a>) I see that I'd probably need to change the manifest entry as well (<code>&lt;service android:name=".GCMIntentService" /&gt;</code>). </p>
  
  <p>Here's the old service: </p>
  
  <pre><code>public class GCMIntentService extends GCMBaseIntentService {
  
      public GCMIntentService() {
          super("GCMIntentService");
      }
  
      @Override
      public void onRegistered(Context context, String regId) {...}
  
      @Override
      public void onUnregistered(Context context, String regId) {...}
  
      @Override
      protected void onMessage(Context context, Intent intent) {...}
  
      @Override
      public void onError(Context context, String errorId) {...}
  }
  </code></pre>
  
  <p>Any guidelines are much appreciated.</p>