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Editor's Notes

1. -GCM ?? ???? ?? 1)???????? Registration Id? ?? ????. (????? ?????? ??? ??? ??? GCM ??? PROJECT ID? ??? ??) 2)??? ID? ?? ???. 3)??????? ??? ID? ???(Message Sender)?? ????. 4)???? ???? Registration ID? ????. (???? ??? ? Regsitration ID? ??? ??? ???? ?? registration Id? ??) 5)??? Registration ID? GCM?? ???? apiKey? ?? ???? ??????? ?? ? ??? ????. 6)GCM Server? apiKey? Registration ID? ?? ???? ??????? ????? ?? ?? ????. 7)??? ?? ??? ????? ????.