如何用动画平滑地填充进度条

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();

Answer 2

A super cute way of doing it on kotlin. based on @ajay-jg 's answer

fun ProgressBar.smoothProgress(percent: Int){
    val animation = ObjectAnimator.ofInt(this, "progress", percent)
    animation.duration = 400
    animation.interpolator = DecelerateInterpolator()
    animation.start()
}

progressbar.smoothProgress(80)