private Image[] _images;
        private Image[] _previewImages;
        private ImageSource[] _imageSources;

 public ShowRoomPage()
        {
            InitializeComponent();

            Loading(true);

            /Other stuff leightweight


            //var scheduler = TaskScheduler.FromCurrentSynchronizationContext();
            Task.Factory.StartNew(() =>
            {
                Thread.Sleep(5000);
                int count = InitializeImages();

                return count;
            }).ContinueWith(r =>
            {
                Device.BeginInvokeOnMainThread(async () =>
                {
                    if (r.Result == GlobalSettings.ImageCount)
                        ButtonsGrid.ColumnDefinitions[1].Width = 0;
                    else
                        ButtonsGrid.ColumnDefinitions[1].Width = GridLength.Star;

                    for (int i = 0; i < r.Result; i++)
                    {
                        ImagesGrid.Children.Add(_previewImages[i]);
                        ImagesStackLayout.Children.Add(_images[i]);
                    }
                    await ShowWallpaperInPreview();

                    await Loading(false);
                });
            });
        }

private int InitializeImages()
        {
            int lastImageIndex = GlobalSettings.ImageCount - GlobalSettings.PremiumCount + GlobalSettings.Unlocked;

            _images = new Image[lastImageIndex];
            _previewImages = new Image[lastImageIndex];
            _imageSources = new ImageSource[lastImageIndex];

            //Foreach not premium wallpaper image
            for (int i = 0; i < lastImageIndex; i++)
            {
                //Create the path
                var path = "Wallpaper.Images.Wallpapers.W" + i + ".jpg";

                //Create images
                _imageSources[i] = ImageSource.FromResource(path);
                _images[i] = new Image()
                {
                    Source = _imageSources[i],
                    Scale = 0.95,
                    Opacity = 0.75
                };
                _previewImages[i] = new Image()
                {
                    Source = _imageSources[i],
                    Opacity = 0
                };

                //Event when user taps on the image
                int index = i;
                var tgr = new TapGestureRecognizer();
                tgr.Tapped += async (sender, args) =>
                {
                    if (!_canInteract)
                        return;

                    _canInteract = false;

                    //Show the image in the preview
                    _selectedImage = index;
                    await ShowWallpaperInPreview();

                    _canInteract = true;
                };

                _images[i].GestureRecognizers.Add(tgr);
            }

            return lastImageIndex;
        }

private async Task Loading(bool value)
        {
            if (value)
            {
                //Hide the view
                _canInteract = false;
                MainGrid.IsVisible = false;
                MainActivityIndicator.IsRunning = true;
            }
            else
            {
                //Fade in the view
                MainActivityIndicator.IsRunning = false;
                MainGrid.Opacity = 0;
                MainGrid.IsVisible = true;
                await MainGrid.FadeTo(1, 800);
                _canInteract = true;
            }
        }

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Wallpaper.ShowRoomPage"
             xmlns:ads="clr-namespace:Wallpaper.Controls;assembly=Wallpaper"
             Title="Wallpapers">
    <ContentPage.Content>
        <Grid BackgroundColor="{StaticResource BackgroundColor}">
            <!--Activity Indicator-->
            <ActivityIndicator x:Name="MainActivityIndicator" HorizontalOptions="Center" VerticalOptions="Center" WidthRequest="45" HeightRequest="45" Color="{StaticResource SecondAccentColor}"/>

            <Grid x:Name="MainGrid">
                <Grid.RowDefinitions>
                    <RowDefinition Height="35"/>
                    <RowDefinition Height="21"/>
                    <RowDefinition Height="4*"/>
                    <RowDefinition Height="21"/>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="10"/>
                    <RowDefinition Height="40"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>

                <!--Preview image-->
                <Grid x:Name="ImagesGrid" Grid.Row="2">
                    <Image x:Name="PreviewImage"/>
                </Grid>

                <!--All images-->
                <ScrollView Grid.Row="4" Orientation="Horizontal" HorizontalScrollBarVisibility="Never">
                    <StackLayout x:Name="ImagesStackLayout" Spacing="10" Orientation="Horizontal"/>
                </ScrollView>
            </Grid>
        </Grid>
    </ContentPage.Content>
</ContentPage>