Xamarin.AndroidX.CameraExtensions: ProcessCameraProvider must implement ICameraProvider

[VladislavAntonyuk]

Android framework version

net9.0-android

Affected platform version

.NET 9

Description

ProcessCameraProvider must implement ICameraProvider: https://developer.android.com/reference/androidx/camera/lifecycle/ProcessCameraProvider

Steps to Reproduce

async Task<CameraSelector> EnableModes(CameraInfo selectedCamera)
	{
		var cameraFutureCts = new TaskCompletionSource();
		var cameraSelector = selectedCamera.CameraSelector ?? throw new CameraException($"Unable to retrieve {nameof(CameraSelector)}");
		var cameraProviderFuture = ProcessCameraProvider.GetInstance(context) ?? throw new CameraException($"Unable to retrieve {nameof(ProcessCameraProvider)}");
		cameraProviderFuture.AddListener(new Runnable(() =>
		{
			var cameraProviderInstance = cameraProviderFuture.Get();
			if (cameraProviderInstance is not AndroidX.Camera.Core.ICameraProvider androidCameraProvider) // this is true, but must be false
			{
				cameraFutureCts.SetResult();
				return;
			}

			var extensionsManagerFuture = ExtensionsManager.GetInstanceAsync(context, androidCameraProvider);
			extensionsManagerFuture.AddListener(new Runnable(() =>
			{
				var extensionsManager = (ExtensionsManager)extensionsManagerFuture.Get()!;
				if (extensionsManager.IsExtensionAvailable(cameraSelector, extensionMode))
				{
					cameraSelector = extensionsManager.GetExtensionEnabledCameraSelector(cameraSelector, extensionMode);
				}

				cameraFutureCts.SetResult();
			}), ContextCompat.GetMainExecutor(context));
		}), ContextCompat.GetMainExecutor(context));

		await cameraFutureCts.Task;
		return cameraSelector;
	}

Did you find any workaround?

No response

Relevant log output

[jonathanpeppers]

So, are you saying the ICameraProvider type is missing?

Can you share what NuGet it is from and what namespace it's expected to be in? Thanks!

[VladislavAntonyuk]

Thank you for your fast reply. Both types are exist. The problem is in inheritance:

Currently:

ProcessCameraProvider : Java.Object

Should be:

ProcessCameraProvider : Java.Object, ICameraProvider.

So the problem appears when you try to use Xamarin.CameraX.CameraExtensions.

ExtensionsManager.GetInstanceAsync second parameter is ICameraProvider. According to the android docs it must be ProcessCameraProvider.

[VladislavAntonyuk]

Thank you for your fast reply. Both types are exist. The problem is in inheritance:

Currently:

ProcessCameraProvider : Java.Object

Should be:

ProcessCameraProvider : Java.Object, ICameraProvider.

So the problem appears when you try to use Xamarin.CameraX.CameraExtensions.

ExtensionsManager.GetInstanceAsync second parameter is ICameraProvider. According to the android docs it must be ProcessCameraProvider.

[jonathanpeppers]

Did this problem start happening with the recent update:

• https://www.nuget.org/packages/Xamarin.AndroidX.Camera.Extensions/1.4.2.2

Or is the problem also there for older versions?

[VladislavAntonyuk]

It is the problem of the previous versions as well.

[jonathanpeppers]

There is likely a build warning in the current binding; that's preventing this from being bound to C# as expected.

[VladislavAntonyuk]

You can reproduce the issue from this PR in EnableModes method: https://github.com/CommunityToolkit/Maui/pull/2710/files

I would like to remove this check and pass cameraProvider directly to ExtensionManager:

if (cameraProviderInstance is not AndroidX.Camera.Core.ICameraProvider androidCameraProvider) // this is true, but must be false
			{
				cameraFutureCts.SetResult();
				return;
			}

[moljac]

Morn

this might be the issue

<remove-node
        path="/api/package[@name='androidx.camera.extensions.internal.sessionprocessor']"
        />

https://github.com/dotnet/android-libraries/blob/main/source/androidx.camera/camera-extensions/Transforms/Metadata.xml#L15C5-L17C11

It is internal, but who knows. Needs deeper investigation.

[VladislavAntonyuk]

@jonathanpeppers , @moljac I have found a workaround using JavaCast:

var cameraProviderInstance = cameraProviderFuture.Get().JavaCast<AndroidX.Camera.Core.ICameraProvider>();