Is it possible to inheritace the SpeechRecognizer class in Xamarin?

Question

I have trying to inheritance the SpeechRecognizer class using following code

public class TestSpeechRecognizer : SpeechRecognizer  
    {  
          
        public TestSpeechRecognizer(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)  
        {  
  
        }  
        public override JniPeerMembers JniPeerMembers => base.JniPeerMembers;  
  
        protected override IntPtr ThresholdClass => base.ThresholdClass;  
  
        protected override Type ThresholdType => base.ThresholdType;  
  
        public override void Cancel()  
        {  
            base.Cancel();  
        }  
  
        public override void Destroy()  
        {  
            base.Destroy();  
        }  
  
        public override bool Equals(object obj)  
        {  
            return base.Equals(obj);  
        }  
  
        public override bool Equals(Java.Lang.Object obj)  
        {  
            return base.Equals(obj);  
        }  
  
        public override int GetHashCode()  
        {  
            return base.GetHashCode();  
        }  
  
        public override void SetRecognitionListener(IRecognitionListener listener)  
        {  
            base.SetRecognitionListener(listener);  
        }  
  
        public override void StartListening(Intent recognizerIntent)  
        {  
            base.StartListening(recognizerIntent);  
        }  
  
        public override void StopListening()  
        {  
            base.StopListening();  
        }  
  
        public override string ToString()  
        {  
            return base.ToString();  
        }  
  
        protected override Java.Lang.Object Clone()  
        {  
            return base.Clone();  
        }  
  
        protected override void Dispose(bool disposing)  
        {  
            base.Dispose(disposing);  
        }  
  
        protected override void JavaFinalize()  
        {  
            base.JavaFinalize();  
        }  
    }  

But I am getting following error on build.
error: SpeechRecognizer() has private access in SpeechRecognizer
public class CarrierSpeechRecognizer

Please help me

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Is it possible to inheritace the SpeechRecognizer class in Xamarin

No, we cannot create a class to extend the SpeechRecognizer class. When creating the custom class, it requires to add the constructor method like below:

   public class TestSpeechRecognizer : SpeechRecognizer  
   {  
       protected TestSpeechRecognizer(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)  
       {  
       }  
   }  

In above code, we can see that the constructor will call the SpeechRecognizer's constructor method. Xamarin.Android is only a layer of wrapper for Android native libraries. In native Android's source code, SpeechRecognizer class only privdes the private constructor method which cannot be accessed just like the error describes.

   //the part source code of the SpeechRecognizer class  
     
   private SpeechRecognizer(final Context context, final ComponentName serviceComponent)  
   {  
       mContext = context;  
       mServiceComponent = serviceComponent;  
   }  

Best Regards,

Jarvan Zhang

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