A kotlin extension to set numbers in textview one by one

TextView.showCountIncrementAnimation.kt

fun TextView.showCountIncrementAnimation(from: Int? = 0, to: Int?) {
    var duration: Long? = null
    val animator = ValueAnimator()
    animator.setObjectValues(from, to)// here you set the range, from 0 to "count" value
    animator.addUpdateListener { animation -> this.text = animation.animatedValue.toString() }
    duration = when (to) {
        in 0..4 -> 200
        in 5..10 -> 1000
        in 11..50 -> 3000
        else -> 2000
    }
    animator.duration = duration
    animator.start()
}