OnGetSeesionFromMediaLibraryService

[pidnee]

Android framework version

net8.0-android

Affected platform version

VS2022

Description

There is a typo in the Medialibrarysession somewhere, its preventing me building a player.

If I use OnGetSeesionFromMediaLibraryService I get no error in my code until I try to build it, then I get Java errors from my C# project. Can someone please fix the typo?

Steps to Reproduce

FIle New Android Project.

Add the usings, then

public override MediaLibrarySession OnGetSessionFromMediaLibraryService(MediaSession.ControllerInfo controllerInfo) gives an error.

public override MediaLibrarySession OnGetSeesionFromMediaLibraryService(MediaSession.ControllerInfo controllerInfo)

Works but does not build.

Did you find any workaround?

No response

Relevant log output

[jonathanpeppers]

I'm guessing the typo is here?

android-libraries/source/androidx.media3/media3-session/Transforms/Metadata.xml

Lines 161 to 166 in 4d4739d

	<attr
	path="/api/package[@name='androidx.media3.session']/class[@name='MediaLibraryService']/method[@name='onGetSession' and count(parameter)=1 and parameter[1][@type='androidx.media3.session.MediaSession.ControllerInfo']]"
	name="managedName"
	>
	OnGetSeesionFromMediaLibraryService
	</attr>

[pidnee]

[jonathanpeppers]

@pidnee can test the pack produced by:

• Fix typo in MediaLibraryService method name: OnGetSeesionFromMediaLibraryService -> OnGetSessionFromMediaLibraryService #1198

Here is a copy of the package, you could rename .zip to .nupkg:

• Xamarin.AndroidX.Media3.Session.1.7.1.1.nupkg.zip

If that works, we can merge & release it.

[pidnee]

@jonathanpeppers After upgrading to .net9 to test I get

I think it needs fixing in the areas in my previous screenshot still?

[jonathanpeppers]

Can you share the .java file the error came from? (and maybe the error text instead of a screenshot)

[pidnee]

So I tried to remove the OnGetSessionFromMediaLibraryService and instead use OnGetSession instead but I always seem to ultimately end up with an error along the lines of

Severity Code Description Project File Line Suppression State
Error (active) CS0534 'AudioService' does not implement inherited abstract member 'MediaLibraryService.OnGetSessionFromMediaLibraryService(MediaSession.ControllerInfo?)'

Since you fixed the OnGetSeesion I can now use the OnGetSession but I get the same error as I originally did. I no longer have the Java errors calling OnGetSession. Just the one above. Seems like the binding in MediaLibraryService has an issue. Asking AI suggests this.

Suggest Specific Areas for Their Investigation:
Based on our debugging, suggest they look at:

The binding definition for MediaLibraryService in their package: How is onGetSession being exposed in the ManagedCallableWrapper or Register attributes within their binding project? There's likely a typo or an incorrect signature specified there that's causing the C# and Java sides to diverge.

The return type mapping for onGetSession: They need to ensure that the binding accurately maps the MediaLibrarySession return type from Java to C#.

The version alignment: Confirm that their MediaLibraryService binding is correctly generated against the exact version of the underlying media3-session.aar or media3-library.aar files.

[jonathanpeppers]

Can you share the .java file the error came from? Or a sample project?

[pidnee]

The Java error came from the package. Not my code.

…

________________________________ From: Jonathan Peppers ***@***.***> Sent: Friday, July 11, 2025 7:24:00 AM To: dotnet/android-libraries ***@***.***> Cc: Paul Hellawell ***@***.***>; Mention ***@***.***> Subject: Re: [dotnet/android-libraries] OnGetSeesionFromMediaLibraryService (Issue #1195) [https://avatars.githubusercontent.com/u/840039?s=20&v=4]jonathanpeppers left a comment (dotnet/android-libraries#1195)<#1195 (comment)> Can you share the .java file the error came from? Or a sample project? — Reply to this email directly, view it on GitHub<#1195 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ABDVYIM7Q5X74DZ26NAZIQL3H3KXBAVCNFSM6AAAAACAWHM6K2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTANJZGE2TENBSGE>. You are receiving this because you were mentioned.Message ID: ***@***.***> Message protected by MailGuard: e-mail anti-virus, anti-spam and content filtering. https://www.mailguard.com.au/mg Report this message as spam<https://console.mailguard.com.au/ras/2aDwd5BNn3/4HPUSy9HKy6WUITyR7F7tH/3.1>

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[jonathanpeppers]

@pidnee if you double-click the error, the file is generated in your obj folder.

[pidnee]

Generated Java.zip

@jonathanpeppers Here are the Java files it generates

[jonathanpeppers]

The error is saying this java method:

public androidx.media3.session.MediaSession onGetSession (androidx.media3.session.MediaSession.ControllerInfo p0)

Needs to return an object compatible with MediaLibrarySession.

It must be caused by these statements:

android-libraries/source/androidx.media3/media3-session/Transforms/Metadata.xml

Lines 56 to 67 in 179d214

	<attr
	path="/api/package[@name='androidx.media3.session']/class[@name='MediaLibraryService']/method[@name='onGetSession' and count(parameter)=1 and parameter[1][@type='androidx.media3.session.MediaSession.ControllerInfo']]"
	name="managedReturn"
	>
	AndroidX.Media3.Session.MediaSession
	</attr>
	<attr
	path="/api/package[@name='androidx.media3.session']/class[@name='MediaLibraryService']/method[@name='onGetSession' and count(parameter)=1 and parameter[1][@type='androidx.media3.session.MediaSession.ControllerInfo']]"
	name="managedOverride"
	>
	override
	</attr>

[jonathanpeppers]

Here is a new package to try:

• Xamarin.AndroidX.Media3.Session.1.7.1.1.nupkg (2).zip

You may need to clear your NuGet cache to try it, as the version number is still 1.7.1.1.

Delete: %userprofile%\.nuget\packages\xamarin.androidx.media3.session\

[pidnee]

@jonathanpeppers The project builds now! However I get an error when I debug.

Could not resolve type with token 0100003f from typeref (expected class 'AndroidX.SavedState.ISavedStateRegistryOwner' in assembly 'Xamarin.AndroidX.SavedState, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null')

I also get the warning NU1608: Detected package version outside of dependency constraint: Xamarin.AndroidX.Lifecycle.Process 2.8.7.4 requires Xamarin.AndroidX.Lifecycle.Runtime (>= 2.8.7.4 && < 2.8.8) but version Xamarin.AndroidX.Lifecycle.Runtime 2.9.1 was resolved.

So I assume I need other packages to be updated to get this working now?