Registration confusion Android GCM

Question

I am trying to migrate to GCM in Android, C2DM now being deprecated. The registration process described here is different from registration describ

Answer 1

GCMRegistrar is just a helper that does the leg work described in the first page.

You can see the class here. android-sdk\extras\google\gcm\gcmclient\src\com\google\android\gcm.