android kotlin tablayout child tab ViewGroup.MarginLayoutParams setMargins, setPadding with padding dp to px

val slidingTabStrip = tabs.getChildAt(0) as ViewGroup
for (i in 0 until slidingTabStrip.childCount - 1) {
    val v = slidingTabStrip.getChildAt(i)
    val p = v.getLayoutParams() as ViewGroup.MarginLayoutParams
    p.setMargins(0, 0, 0, 0)

    val scale = resources.displayMetrics.density
    var pxl = resources.getDimensionPixelSize(R.dimen.gap1)
    val padding_in_dp = 3    val padding_in_px = (padding_in_dp * scale + 0.5f).toInt()
    v.setPadding(pxl, pxl, pxl, pxl)
}