Play a sound from aar plugin

Hello boys.

I’m trying to develop an aar plugin for Unity writen in Java. Calling funcions from Unity work perfecly, so the plugin looks good.

I have the theorical aar folder structure and inside “res/raw/” there is a sound. Plugin builds good calling to that resource and makes a build failed when the sound name is different. But once compiled in the mobile i get a resource not found exception inside Java about that sound.

Any idea?

Thanks in advance.

Plugin code.

package com.nraboy.testplugin;
import android.content.Context;
import android.widget.Toast;
import android.media.MediaPlayer;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
public class ToastExample {
 
    private Context context;
    private static ToastExample instance;

    private MediaPlayer mp = null;
    public ToastExample() {
        this.instance = this;
    }
    public static ToastExample instance() {
        if(instance == null) {
            instance = new ToastExample();
        }
        return instance;
    }
    public void setContext(Context context) {
        this.context = context;
    }
    public void showMessage(String message) {
        Toast.makeText(this.context, message, Toast.LENGTH_SHORT).show();
    }
 
    public void playSound(String message) {   
        Toast.makeText(this.context, message, Toast.LENGTH_SHORT).show();
              
            try
            {
                mp = MediaPlayer.create(this.context, R.raw.sonar_slow); 
                mp.start();
            }
            catch (Exception e)
            {
                Toast.makeText(this.context, "ERROR: "+e, Toast.LENGTH_SHORT).show();
            }

    }
}

And the error:

After days of several attemps I’m not able to find a solution. Looks lime sounds are not being included in the res folder when i do “ant jar” to build the jar, even if they inside “bin\classes\com\nraboy\testplugin\R$raw.class”

On the opposite he png files work well.

Not sure what i’m doing wrong, maybe it is not possible. Any idea?