How to Ignore Palm Finger Event on Samsung Galaxy 3

I have several buttons in an android app that play a tone when pressed and stop playing when the button is released. I am using code as below to implement this

  private OnTouchListener dialTouch = new OnTouchListener() 
  {
    public boolean onTouch(View v, MotionEvent event)
    {
         if ( event.getAction() == MotionEvent.ACTION_DOWN) 
            {   
                 //play tone
            }
            else  if ( event.getAction() == MotionEvent.ACTION_UP) 
            {
                    // stop tone
            }
     }
  }

      

        
        
        
      

    

However, on Samsung Galaxy 3, the swipe-to-finger function, such as when taking a picture, triggers these MotionEvent.ACTION_DOWN. Is there a way to ignore the finger swipe event in the code, but still it is possible to generate a tone on a button click.

thank