ContentResolver for Xamarin.Forms

We often face some challenges when working with Xamarin.Forms.
In a similar instance, I faced one when trying to read Contacts. I found myself in a fix because the data that I had received for an Image was basically a URI with type content://

The data retrieved from the Contact for a Thumbnail was something like this:
content://com.android.contacts/contacts/29059/photo

Obviously, Xamarin.Forms is fully equipped to deal with any sort of ImageSource that comes in its ways, except something that is directly a platform specific.

In order to render this, I went ahead with DependencyServices.
Here’s my implementation for this:

IContentImageService.cs
public interface IContentImageService
{
    Stream GetImageUri(string contentUri);
}
ContentResolverMethods.cs
[assembly: Xamarin.Forms.Dependency(typeof(ContentResolverMethods))]
namespace YourNamespace.Droid.Dependencies
{
    public class ContentResolverMethods : IContentImageService
    {
        public Stream GetImageUri(string contentUri)
        {
            var uri = Android.Net.Uri.Parse(contentUri);
            return Android.App.Application.Context.ContentResolver.OpenInputStream(uri);
        }
    }
}

Now in order to use this, you can always invoke the method implemented in Android using DependencyServices from within the Xamarin.Forms Project which is either a .NetStandard, Shared or a PCL based project

var stream = DependencyService.Get<IContentImageService>().GetImageUri(imageUri);
return ImageSource.FromStream(() => stream);

Happy Coding!

Anubhav Ranjan

Software Engineer II at Microsoft

Anubhav is a Program Freak who loves coding and is currently working as a Software Engineer II in Xamarin Team at Microsoft. He is very passionate about Coding and loves developing Mobile Apps. At present, he helps C# Developers in taking their code across platforms. Also, pretty much interested in the latest ongoing trend which is Bots and AI. Currently working on Microsoft Bot Framework as well.
He is an active member of the BDotnet(Bangalore .NET) User Group and Speaker/Member of XHackers - A Community for Cross-Platform App Development.

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