Question

which is the best practice to identify if a registrationId is actually used by the app or not? I would like to remove unused registrationIds from the 3rd party server. I cannot use username to track registrationIds because this avoids the user to use the same username on different devices and I cannot use TelephoneId because this wouldn’t work on tablets.
So what could it be used?

Thanks
Tobia Loschiavo

Answer 1

You have to send a push message to see if the RegistrationID is still in use.

have a look at http://code.google.com/intl/de/android/c2dm/#push

There’s a section for the error code:

Error=[error code]

NotRegistered — The user has uninstalled the application or turned off notifications. Sender should stop sending messages to this device and delete the registration_id. The client needs to re-register with the c2dm servers to receive notifications again.

So you can delete the RegistrationID if you get this NotRegistered Error Code when sending a notification.