Medium: Smooth loading

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="loading_animation_start">#9b9b9b</color>
    <color name="loading_animation_end">#d2d2d2</color>
</resources>

ImageView_startLoadingAnimation.kt

fun ImageView.startLoadingAnimation(
    @ColorRes startColorRes: Int,
    @ColorRes endColorRes: Int
) {
    animate(
        ArgbEvaluator(),
        colors[startColorRes],
        colors[endColorRes],
        onConfig = {
            duration = 1000
            repeatMode = ValueAnimator.REVERSE
            repeatCount = ValueAnimator.INFINITE
        },
        onUpdate = this::setBackgroundColor
    ).start()
}