CODEWITHSUNDEEP
androidpush-notificationgoogle-cloud-messaging
Robin Macharg
Robin Macharg

Reputation: 1848

When sending a push notification to multiple Android devices how can I detect which specific device(s) have had the app uninstalled?

Google Cloud Messaging (GCM) allows the sending of a push notification to multiple devices in a single request. In the event that a user has uninstalled the app I receive a NotRegistered error response. How can I tell which of the multiple devices has had the app removed (and thereby unregister them and not send them any more notifications)?

Should I play safe and simply send one message per device (treating the multiple device-option as an all-user broadcast) or do alternatives exist?

Upvotes: 1

Views: 632

Answers (1)

Dr O
Dr O

Reputation: 111

If you are sending push notifications to more than one device (registration_ids) in a single request then your best bet is to use the JSON interface as opposed to the plain-text interface. The JSON interface will respond with an object showing the number of successes and failures along with a list of results objects for each device you sent a push notification to.

Unfortunately, the example in the documentation here: http://developer.android.com/google/gcm/http.html shows an incorrect format.

Here is an example response:

{
  "multicast_id":123456,
  "success":1,
  "failure":1,
  "canonical_ids":0,
  "results":[
    {"message_id":"0:abcde"},
    {"error":"NotRegistered"}
  ]
}

You can first check the number of failures and, if there failures, iterate through the list of results. The number of elements in results will be the same as the number of push messages you sent and the order is the same as the registation_ids specified in the request. You can now find the errors and tally which devices are NotRegistered or are even an InvalidRegistration; both meaning that the registation_id is no longer valid and your server should stop sending it push notifications.

Upvotes: 1

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