private void OnRewardedVideoLoadedEvent(string adUnitId)
    {
        List <MoPubBase.Reward> availableRewards = MoPubAndroid.GetAvailableRewards(adUnitId);

        this._demoGUI.AdLoaded(adUnitId);
        this._demoGUI.LoadAvailableRewards(adUnitId, availableRewards);
    }