OnTouchListener will not be triggered

Question

I set a breakpoint at one of the lines but it seems that it never stops at the break point, and I assume based on that that it simply wasn't triggered, here is the code:

final ImageView imageViewRoomButton = (ImageView) findViewById(R.id.imageView9);

final GestureDetector gdt = new GestureDetector(new GestureListener());

imageViewRoomButton.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(final View view, final MotionEvent event) {
            gdt.onTouchEvent(event);
            return true;
        }
    });


private class GestureListener extends GestureDetector.SimpleOnGestureListener {

    @Override
    public boolean onDown(MotionEvent event) {



        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Toast toast1 = Toast.makeText(getApplicationContext(), "you just swiped up", Toast.LENGTH_LONG);
        toast1.show();

        if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
            return true; // Right to left
        }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
            return true; // Left to right
        }

        if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {


            return true; // Bottom to top
        }  else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
            return true; // Top to bottom
        }
        return true;
    }
}

I placed breakpoints in both onFling, onDown and onTouch, nothing happens.

Any suggestions?