onTouchEvent not working in android

@Override
 public boolean onTouchEvent(MotionEvent event) {
  // TODO Auto-generated method stub


  switch(event.getAction()){
  case MotionEvent.ACTION_DOWN:
  case MotionEvent.ACTION_MOVE:
   float x = event.getX();
   float y = event.getY();

   Toast.makeText(this, "Touched@" + x + " : " + y, Toast.LENGTH_LONG).show();
  // ((AndroidDetechTouchActivity)getContext()).updateMsg("Touched@" + x + " : " + y);
   break;
  case MotionEvent.ACTION_UP:
 //  ((AndroidDetechTouchActivity)getContext()).updateMsg("");
   break;
  }

  return true;
 }