register.java

public synchronized static void registerService(Context applicationContext) {
            Intent serviceIntent = new Intent(applicationContext, GcmRegistrationService.class);
            PendingIntent scheduleIntetnt = PendingIntent.getService(GlideApplication.applicationContext, REQUEST_CODE, serviceIntent, PendingIntent.FLAG_UPDATE_CURRENT);
            if (scheduleIntetnt == null) {
                if(DEBUG) {
                    Utils.log(TAG, "no need to schedule again since there is already a PendingIntent in the queue", 1);
                }
                return;
            }
            long now = System.currentTimeMillis();
            long backoff = sharedPrefsManager.incrementGcmBackoff();
            long when = now + backoff;
            am.set(AlarmManager.RTC_WAKEUP, when, scheduleIntetnt);
            Utils.log(TAG, "scheduled intent to run in " + when + " millis", 1);
}