private async Task <ListResultBase> GetMoreActivities(String request)
        {
            if (ActivitiesLoading)
            {
                return(null);
            }

            ActivitiesLoading = true;

            var result = await _topic.GetActivitiesAsync(LoginUser.Current.Token, request, true);

            ActivitiesLoading = false;

            if (result.Result == null)
            {
                ToasteIndicator.Instance.Show(String.Empty, result.Error.Message, null, 3);

                return(null);
            }

            return(result);
        }