HeartBeat.java

PropertyValuesHolder pvhIncreaseScaleX =
        PropertyValuesHolder.ofFloat("scaleX", 1.0f, 0.8f);
PropertyValuesHolder pvhIncreaseScaleY =
        PropertyValuesHolder.ofFloat("scaleY", 1.0f, 0.8f);
PropertyValuesHolder pvhDecreaseScaleX =
        PropertyValuesHolder.ofFloat("scaleX", 0.8f, 1.0f);
PropertyValuesHolder pvhDecreaseScaleY =
        PropertyValuesHolder.ofFloat("scaleY", 0.8f, 1.0f);

ObjectAnimator heartBeatIncreaseAnimator = ObjectAnimator.ofPropertyValuesHolder(
        mImageView, pvhIncreaseScaleX, pvhIncreaseScaleY
);
heartBeatIncreaseAnimator.setStartDelay(1200);
heartBeatIncreaseAnimator.setDuration(100);
heartBeatIncreaseAnimator.setInterpolator(new AccelerateDecelerateInterpolator());

ObjectAnimator heartBeatDecreaseAnimator = ObjectAnimator.ofPropertyValuesHolder(
        mImageView, pvhDecreaseScaleX, pvhDecreaseScaleY
);
heartBeatDecreaseAnimator.setDuration(100);
heartBeatDecreaseAnimator.setInterpolator(new AccelerateDecelerateInterpolator());

AnimatorSet heartBeatAnimatorSet = new AnimatorSet();
heartBeatAnimatorSet.playSequentially(heartBeatIncreaseAnimator, heartBeatDecreaseAnimator);
heartBeatAnimatorSet.start();