fancy button animation scales when pressed, tilts based on finger movement

gistfile1.txt

b.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                float touchPositionX = motionEvent.getX();
                float touchPositionY = motionEvent.getY();
                float touchNormalX = touchPositionX / b.getWidth()-.5f;
                float touchNormalY = touchPositionY / b.getHeight()-.5f;
                touchNormalX = Math.max(Math.min(touchNormalX, .5f), -.5f);
                touchNormalY = Math.max(Math.min(touchNormalY, .5f), -.5f);
                switch(motionEvent.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        b.animate().scaleX(.9f).scaleY(.9f).setDuration(300).rotationY(touchNormalX * 20).rotationX(-touchNormalY * 20).start();
                        break;
                    case MotionEvent.ACTION_MOVE:
                        b.animate().rotationY(touchNormalX * 20).rotationX(-touchNormalY * 20).setDuration(0).start();
                        break;
                    case MotionEvent.ACTION_OUTSIDE:

                        break;
                    case MotionEvent.ACTION_UP:
                        b.animate().scaleX(1).scaleY(1).setDuration(300).rotationX(0).rotationY(0).start();
                        break;
                }

                return false;
            }
        });