[Media3] Attempting to create ExoPlayer instance crashes

[tipa]

Android framework version

net9.0-android

Affected platform version

.NET 9

Description

The code throw an exception when trying to create an instance of ExoPlayer

System.ArgumentException: Could not determine Java type corresponding to AndroidX.Media3.ExoPlayer.IExoPlayerInvoker, Xamarin.AndroidX.Media3.ExoPlayer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null. (Parameter 'targetType')

Steps to Reproduce

var builder = new AndroidX.Media3.ExoPlayer.ExoPlayerBuilder(this);
var player = builder.Build();

Example project:
media3.zip

Given other developers seem to already be using the media3 bindings, I wonder if I am doing anything wrong...?

Did you find any workaround?

No response

Relevant log output

No response

[bmaluijb]

I have the exact same issue. I've tried many variations, including a clean MAUI project running .NET 9 (full version, not pre-release).

[moljac]

Repro Exception

System.ArgumentException: Could not determine Java type corresponding to `AndroidX.Media3.ExoPlayer.IExoPlayerInvoker, Xamarin.AndroidX.Media3.ExoPlayer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null`. (Parameter 'targetType')
   at Java.Interop.TypeManager.CreateInstance(IntPtr handle, JniHandleOwnership transfer, Type targetType) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Java.Interop/TypeManager.cs:line 323
   at Java.Lang.Object.GetObject(IntPtr handle, JniHandleOwnership transfer, Type type) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Java.Lang/Object.cs:line 302
   at Java.Lang.Object._GetObject[IExoPlayer](IntPtr handle, JniHandleOwnership transfer) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Java.Lang/Object.cs:line 288
   at Java.Lang.Object.GetObject[IExoPlayer](IntPtr handle, JniHandleOwnership transfer) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Java.Lang/Object.cs:line 280
   at AndroidX.Media3.ExoPlayer.ExoPlayerBuilder.Build() in D:\a\_work\1\s\generated\androidx.media3.media3-exoplayer\obj\Release\net8.0-android\generated\src\AndroidX.Media3.ExoPlayer.IExoPlayer.cs:line 749
   at media3.MainActivity.OnCreate(Bundle savedInstanceState) in /Users/moljac/Downloads/1036/media3/MainActivity.cs:line 16
   at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net9.0/android-35/mcw/Android.App.Activity.cs:line 3196
   at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(_JniMarshal_PPL_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 121

[ne0rrmatrix]

Here is an example of how to use media 3 with Maui. CommunityToolkit/Maui#2076

var Player = new ExoPlayerBuilder(Platform.AppContext).Build() ?? throw new InvalidOperationException("Player cannot be null");

Above is how you create an new instance of the player

[bmaluijb]

@ne0rrmatrix Have you tested this with .NET 9? I cannot get it working, just get the exception.

[ne0rrmatrix]

I have tested against dotnet 8 over the last few months. I am currently unable to test using either dotnet 8 or 9 and can't provide any feedback. After updating to dotnet 9 I cannot build anything. Once I get my mac's and pc's working with new dotnet I will see if any changes are needed.

[moljac]

Let me create repro sample for both net9.0 and net8.0, so we can narrow it down.

[moljac]

Archive.zip

Repro:

dotnet build net8.0/media3/media3.csproj -t:run -f:net8.0-android

OK!

dotnet build net9.0/media3/media3.csproj -t:run -f:net9.0-android

Crashes!!!

[ne0rrmatrix]

SDK version needs to be set for dotnet 9.
Example:

{
   "sdk": 
   {
       "version": "9.0.100",
       "rollForward": "patch"
   },
   "msbuild-sdks": 
   {
       "MSBuild.Sdk.Extras": "3.0.44",
       "Microsoft.Build.Traversal": "4.1.0",
       "Microsoft.Build.NoTargets": "3.7.56",
       "Xamarin.Legacy.Sdk": "0.2.0-alpha4"
   }
}

Sample builds fine in Debug or Release mode when using current 9.0 version of dotnet from VS 2022 install.

edit: Sample build fine but does crash when app loads.

[moljac]

Sample builds fine in Debug or Release mode when using current 9.0 version of dotnet from VS 2022 install.

Yes. Builds fine, but crashes during running.

[jonpryor]

I believe that this was broken by: 35f41dc

What I don't understand is why this wasn't caught by existing unit tests, e.g.

android/tests/Mono.Android-Tests/Java.Interop/JavaObjectExtensionsTests.cs

Line 38 in 70948d5

var c = JavaObjectExtensions.JavaCast<Java.Lang.IComparable> (o);

[moljac]

@ne0rrmatrix

Does your app crash during running [loading]?

Just to be certain

[ne0rrmatrix]

App crashes after launching activity. It also only crashes when exoplayer build() instruction is executed

[ne0rrmatrix]

To be specific it crashes only when executing Build(). If I run

var player = new ExoplayerBuilder(); // App does not crash. Return type is `ExoplayerBuilder`
player.Build(); // App crashes on this line. Return type is `IExoPlayer`

[moljac]

@ne0rrmatrix

Thanks a lot. Did you use repro sample provided in this issue?

Just asking, so other can use it for debugging.

thx

[ne0rrmatrix]

Yes I tried the sample app. It has exact same behavior. I also tested by modifying it like above to try and test if ExoPlayerBuilder was working. It is working for that class. It is only the Build() method that causes the crash.