public static async Task CreateUserActivityAsync(UserActivityData activityData, IAdaptiveCard adaptiveCard)
        {
            var activity = await activityData.ToUserActivity();

            activity.VisualElements.Content = adaptiveCard;
            //Save
            await SaveAsync(activity);
        }
        public static async Task AddSampleUserActivity()
        {
            var activityId  = nameof(SchemeActivationSamplePage);
            var displayText = "PIANTE E FIORI";
            var description = $"Torna alle schede botaniche '{Package.Current.DisplayName}' at {DateTime.Now.ToShortTimeString()}";
            var imageUrl    = "ms-appx:///Assets/lotus_1600.png";
            //var imageUrl = "http://adaptivecards.io/content/cats/2.png";

            var activityData = new UserActivityData(activityId, CreateActivationDataSample(), displayText, Colors.DarkRed);
            var adaptiveCard = CreateAdaptiveCardSample(displayText, description, imageUrl);

            await UserActivityService.CreateUserActivityAsync(activityData, adaptiveCard);
        }
        public static async Task CreateUserActivityAsync(UserActivityData activityData)
        {
            UserActivityChannel channel      = UserActivityChannel.GetDefault();
            UserActivity        userActivity = await channel.GetOrCreateUserActivityAsync("HomePagePage");

            // Populate required properties
            userActivity.VisualElements.DisplayText = "Home Page";
            userActivity.ActivationUri = new Uri("pf-app://HomePagePage");

            //Save
            await userActivity.SaveAsync(); //save the new metadata

            // Dispose of any current UserActivitySession, and create a new one.
            _currentActivity?.Dispose();
            _currentActivity = userActivity.CreateSession();



            // Cleanup any content assigned earlier
            //activity.VisualElements.Content = null;
            // await SaveAsync(activity);
        }