Is there a point in collecting registration tokens when using only the GCM Topics?
问题 I'm currently implementing Google Cloud Messaging into my app. Basically my app has categories and I need my users to be notifed about recurring events in those categories. I decided to use GCM Topics as a simple way to notify all the users subscribed to a specific category (I will have about 200-300 topics). My question is : Since I don't plan on notifying a single user but instead all users subcribed to a specific topic, is there a point in collecting the registration tokens on my server ?