InstanceID and Regid GCM

Question

as i read, the gcm.register () function is deprecated. and I can use InstanceID.getToken () instead ...

I use it as described here, but every time I run the application, I get a new RegID (instance id).

here as i registered:

        @Override
        protected String doInBackground(Object[] voids) {
            String msg = "";

            if (gcm == null) {
                gcm = GoogleCloudMessaging.getInstance(MyApp.getContext());
            }
            InstanceID instanceID = InstanceID.getInstance(context1);
            EntryActivity. regid = null;
            try {

                EntryActivity.regid = instanceID.getToken(ConstantsGCM.senderID_ProjectID, GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
                Log.d("REG---", "========================>>>- regid= " + EntryActivity.regid);

            } catch (IOException e) {
                e.printStackTrace();
            }

            if (EntryActivity.regid != null)
                try {
                    storeRegistrationId(context1, EntryActivity.regid);
                } catch (PackageManager.NameNotFoundException e) {
                    e.printStackTrace();
                }
            Log.d("REG---", "- " + msg + "regid= " + EntryActivity.regid);
            return msg;
        }

and then I sent "regid" to my server and saved it to the database. So far, each of them worked fine, but when I send a message to the server via GCM (gcm.send (...);) and call the "from" field of the message (on the server side), I get a different regID, and each time when I restart the application and submit, I get a new regID (for each change regId has changed).

RegID, , , .