Android Azure Notification hub unregister

问题:

I'm having a problem with unregistering notification hub from Azure.

I'm using method unregister() like this :

gcm = GoogleCloudMessaging.getInstance(getApplicationContext());

String connectionString = "xxx";
hub = new NotificationHub("xxx", connectionString, getApplicationContext());

try {
    gcm.unregister();
    hub.unregister();
    Log.d("GCM","Unregister");
} catch (IOException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
};

I don't get any exception in this code, but I'm still getting push notification. Any help will be apreciated. Thanks in advance.

回答1:

You shouldn't unregister from GCM.

Why you should rarely unregister

You should only need to unregister in rare cases, such as if you want an app to stop receiving messages, or if you suspect that the registration ID has been compromised. In general, once an app has a registration ID, you shouldn't need to change it.

In particular, you should never unregister your app as a mechanism for logout or for switching between users, for the following reasons:

• A registration ID isn't associated with a particular logged in user. If you unregister and then re-register, GCM may return the same ID or a different ID—there's no guarantee either way.

• Unregistration may take up to 5 minutes to propagate.

• After unregistration, re-registration may again take up to 5 minutes to propagate. During this time messages may be rejected due to the state of being unregistered, and after all this, messages may still go to the wrong user.

More info here: http://developer.android.com/google/gcm/gcm.html#unreg-why

Since you are using Azure Notification Hub, you just need to delete registration from there, not from GCM.

回答2:

In general, just using hub.unregister() will suffice. Alternatively, just call hub.register() with an invalid tag, and it should overwrite the existing registration.

However, I've found that registrations are sometimes duplicated in the Notification Hub (same PNS, different tags/Azure Registration ID), and unregister only removes one of them, so you keep getting notified. Maybe this happens when you reinstall the app, not sure.

Anyway, to solve this you can delete the registration manually (Visual Studio > Server Explorer > Notification Hubs > Select one > Device registrations tab).

回答3:

I think you should use a different Thread to unregister that device. Below way works for me correctly. Please don't forget to keep hub which is used to register device. In below, I generated a HubKeeper class and i kept that hub in HubKeeper class as static. But differently, I have used FCM instead of GCM

 Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {
                try  {
                    if (HubKeeper.hub != null) {
                        HubKeeper.hub.unregister();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
        thread.setPriority(Thread.MIN_PRIORITY);
        thread.start();