MAUI error XA4212: implements `Android.Runtime.IJavaObject` but does not inherit `Java.Lang.Object` or `Java.Lang.Throwable`

Question

I'm trying to implement speech recognition for my MAUI app with Android.speech. I'm following this article. At step to set recognition listener, I had to creat a class RecognitionListener inheriting IRecognitionListener, implemented those functions within and passed RecognitionListener variable into SpeechRecognizier.SetRecognitionListener. However I came across this error:

error XA4212: Type AndroidSpeech.RecognitionListener implements Android.Runtime.IJavaObject but does not inherit Java.Lang.Object or Java.Lang.Throwable. This is not supported.

Please help me!

P/S: I can use other speech recognition API like Azure or Google, which require internet to authenticate subscription. But I want to try this out as an offline speech recognition library.