i've read in google cloud messaging documentation gcm key unique per device , per application. if uninstall , reinstall application key same, ie, key calculated based on device , application identifiers or key change?
no, key (called registration id) may change after uninstall , re-install app.
the following scenario cause id change :
- un-install app
- send gcm message device several times, until gcm server realizes app uninstalled device
- re-install app
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