Hi me again about GCM.
I tested APP42 api for GCM , and found there is a need for backend support for this. details as below.
A installed app with GCM, app42 server with username A and device id recode.
A uninstalled it withou logout.
B reinstalled it, but B won't know A's user name and device id. So B cannot delete A's record from server.
So server will have both A's and B's record, whenever a message to A or B, B will be noticfied.
I think solution should be on the server somehow detected if two different device id is the same device and delete the previous one, there is little thing can be done at user side.
Please let me know, thanks.