Save all images in ListView - windows-phone-8

Question

I am loading a bunch of images from Vk.com in a ListView.I'd like to be able to download/save all images in any list to the phone's gallery, either in a simple event or by default. How would I go about this?
This is the XAML.
<Page.BottomAppBar>
<CommandBar>
<AppBarButton FontSize="15" FontFamily="Times New Roman" Icon="Back" Label="Albums" Click="AppBarButton_Click"/>
</CommandBar>
</Page.BottomAppBar>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="50"></RowDefinition>
<RowDefinition Height="*"> </RowDefinition>
</Grid.RowDefinitions>
<TextBlock x:Name="MyTextBlock" FontSize="35" HorizontalAlignment="Center"></TextBlock>
<ListView Grid.Row="1"
ItemsSource="{Binding}"
SelectionMode="None"
IsItemClickEnabled="False"
>
<ListView.ItemTemplate>
<DataTemplate>
<Image Stretch="UniformToFill" Source="{Binding image_final}"
AutomationProperties.Name="{Binding Title}"
Width="Auto"
Height="Auto"
></Image>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>

Answer 1

You've tagged this as WP8 and WP8.1. The code below is for 8, however shouldn't take too much work for 8.1.
You can download and save an image to the users gallery like this:
using Microsoft.Xna.Framework.Media;
using System.Windows.Media.Imaging;
using System.IO;
WebClient client = new WebClient();
client.OpenReadCompleted += (s, ev) =>
{
var streamResourceInfo = new StreamResourceInfo(ev.Result, null);
BitmapImage bitmap = new BitmapImage();
bitmap.SetSource(streamResourceInfo.Stream);
WriteableBitmap bmp = new WriteableBitmap(bitmap);
MediaLibrary library = new MediaLibrary();
using (MemoryStream stream = new MemoryStream())
{
Extensions.SaveJpeg(bmp, stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100);
library.SavePicture("imagename.jpg", stream.ToArray());
}
MessageBox.Show("The picture has been saved to your Pictures Hub", "Success!", MessageBoxButton.OK);
};
client.OpenReadAsync(new Uri("http://example.com/imageurl.jpg"));
Obviously put the correct image URL in the last line. And optionally replace "imagename.jpg" with the real name of the image.

Answer 2

This link really explains everything: saving images, and organizing them into folders. Definitely worth a read.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/769c9a6c-961c-47ea-bddf-a381db932289/saving-an-image-from-the-web-to-the-saved-pictures-folder-in-windows-phone-81-rt-c?forum=wpdevelop
Explanation:
//Create a storage folder in the Pictures Library:
StorageFolder AppFolder = await KnownFolders.PicturesLibrary.CreateFolderAsync("XYZ", CreationCollisionOption.OpenIfExists);
//Naming and storing the file:
var uri = imageuri; //image uri
var filename = Path.GetFileName(uri.LocalPath); //designates file name
var thumbnail = RandomAccessStreamReference.CreateFromUri(uri);
var remoteFile = await StorageFile.CreateStreamedFileFromUriAsync(filename, uri, thumbnail);
await remoteFile.CopyAsync(albumname, filename, NameCollisionOption.FailIfExists); //Fail if argument filename is a string by which a file is already saved.
I hope this helps.