Make a ProgressBar update smoothly

The Interpolator has to be attached to an animation and this will work only on Honeycomb or higher:

if(android.os.Build.VERSION.SDK_INT >= 11){
    // will update the "progress" propriety of seekbar until it reaches progress
    ObjectAnimator animation = ObjectAnimator.ofInt(seekbar, "progress", progress); 
    animation.setDuration(500); // 0.5 second
    animation.setInterpolator(new DecelerateInterpolator());
    seekbar.setProgress(progress); // no animation on Gingerbread or lower

If your minimum SDK is Gingerbread or lower, add:

// or 

to your function/class.

I used a DecelerateInterpolator, but this is optional and there are others possibilities.

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