Anim heart beat

ImageView iv = (ImageView) findViewById(R.id.my_imageview);

ObjectAnimator scaleDown = ObjectAnimator.ofPropertyValuesHolder(
                    iv,
                    PropertyValuesHolder.ofFloat("scaleX", 1.2f),
                    PropertyValuesHolder.ofFloat("scaleY", 1.2f));
scaleDown.setDuration(310);

scaleDown.setRepeatCount(ObjectAnimator.INFINITE);
scaleDown.setRepeatMode(ObjectAnimator.REVERSE);

scaleDown.start();