Xamarin.Forms ImageCell binding to a local file - xamarin.forms

Question

I'm using data binding in a ListView to bind a list of ImageCells. The image is a file stored locally on the device as app data.
On Windows, using an absolute or relative path to the file does not work, I have to convert it to a file:// URI. Unfortunately, on Android, the file:// URI doesn't work, and it needs to be a path.
I'm currently working around the issue by using a different value in the view model depending on the target platform. Is there a better solution than this:
if (Device.OS == TargetPlatform.Windows) {
result.uri = new Uri(uri).AbsoluteUri;
}
Xaml:
<ListView.ItemTemplate>
<DataTemplate>
<ImageCell ImageSource="{Binding Uri}"
Text="{Binding Name}">
</ImageCell>
</DataTemplate>
</ListView.ItemTemplate>
The type of Uri is string, do I need to use a UriImageSource instead?

Answer 1

I solved it by creating converter and dependency service.
Xaml
<ContentPage.Content>
<StackLayout VerticalOptions="FillAndExpand" Padding="5,20,5,0" >
<ListView x:Name="list" ItemsSource="{Binding MyList}">
<ListView.ItemTemplate>
<DataTemplate>
<ImageCell Text="{Binding Name}" ImageSource="{Binding ImagePath, Converter={StaticResource AndroidImageInvert}}">
</ImageCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
Converter
public class ByteImageConverter : IValueConverter
{
public object Convert(object value, Type targetType,
object parameter, CultureInfo culture)
{
string fileName = value as string;
return ImageSource.FromStream(() => new MemoryStream(DependencyService.Get<IWRDependencyService>().GetImageBytes(fileName)));
}
public object ConvertBack(object value, Type targetType,
object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Dependency Service
public byte[] GetImageBytes(string fileName)
{
fileName = fileName.Replace(".jpg", "").Replace(".png", "");
var resId = Forms.Context.Resources.GetIdentifier(
fileName.ToLower(), "drawable", Forms.Context.PackageName);
var icon = BitmapFactory.DecodeResource(Forms.Context.Resources, resId);
var ms = new MemoryStream();
icon.Compress(Bitmap.CompressFormat.Png, 0, ms);
byte[] bitmapData = ms.ToArray();
return bitmapData;
}