StatusBarNotification getActiveNotification(int notificationId) {
        for (StatusBarNotification statusBarNotification : getActiveNotifications()) {
            if (statusBarNotification.getId() == notificationId) {
                return statusBarNotification;
            }
        }

        return null;
    }
Returns the active status bar notification with the specified notificationId.
If there is no active status bar notification, null will be returned.
@param notificationId
src/android/Manager.java