subscribing and unsubcribing to/from many topics dynamically?

[thomasdola]

first of all thanks for this awesome library. from what i got from your readme => i can only call GMCManager.getInstance(this).subscribeTopic("Gospel"); from onDeviceRegisted. but i have a case where the user can follow and unfollow many music genres withing a single activity. =>when the user click follow -> say: Gospel, HipHop => i have to call GCMManager.getInstance(this).subscribeTopic("Gospel"); and the same function for for the HipHop Genre. =>Same process applies to unfollowing the generes. So how can i do that? And how will i know onDeviceRegistered() has been called?