Java Question How to implement OnTouchListener in a costum view?

package com.floor;
import android.content.Context;
import android.view.View;
import android.view.View.OnTouchListener;
import anywheresoftware.b4a.objects.collections.Map;

@BA.Version(1.0F)
@BA.ShortName("Croquis")
@BA.Events(values={"OnTouchListener (Value As Boolean)"})


public class croquis extends ViewWrapper<DrawGrid> implements DesignerCustomView ,OnTouchListener    {
       DrawGrid cv;
       private String eventName;
       private BA ba;

     public void Initialize(BA paramBA, String paramString)
      {
        _initialize(paramBA, null, paramString);
      }
    
      @BA.Hide
      public void _initialize(BA paramBA, Object paramObject, String paramString)
      {
        this.eventName = paramString.toLowerCase(BA.cul);
        this.ba = paramBA;
        this.cv = new DrawGrid(paramBA.context);
        cv.setOnTouchListener(this); //????
       
      }   
        @Override
        public boolean onTouch(View arg0, MotionEvent arg1) {
        //my code
            return true;
        }
         
   
    
public void DesignerCreateView(PanelWrapper paramPanelWrapper, LabelWrapper paramLabelWrapper, final Map paramMap)
      {
        
           this.cv = new DrawGrid(ba.context);
        
         
           paramPanelWrapper.AddView(this.cv, 0, 0,  paramPanelWrapper.getWidth(),       paramPanelWrapper.getHeight());
           paramPanelWrapper.setColor(Colors.Transparent);
      
           }

   
        //rest of code
  

}