How to fill progress bar smoothly with animation

Question

I have implemented the progress bar with fill animation, but I would like to have a animation effect like a train and which would fill fast to a particular point and then a bit slow brake in the speed till the end point. My current animation implementation is:

ObjectAnimator animation = ObjectAnimator.ofInt(pbOption, "progress", percent);
animation.setDuration(1250);
animation.setInterpolator(new AccelerateInterpolator());
animation.start();

Answer 1

Change AccelerateInterpolator() to DecelerateInterpolator(). Here the rate of change starts out quickly and and then decelerates.

   ObjectAnimator animation = ObjectAnimator.ofInt(pbOption, "progress", percent);
            animation.setDuration(1250);
            animation.setInterpolator(new DecelerateInterpolator());
            animation.start();