ExpandableStackView

ExpandableStackView.kt

val views = mutableListOf<View>()

for (i in 0 until adapter.count) {

    val view = adapter.getView(i, null, this)
    val cardView = view.findViewById<CardView>(R.id.cardContainer)
    view.id = View.generateViewId()

    startSet.constrainHeight(view.id, ConstraintSet.WRAP_CONTENT)
    endSet.constrainHeight(view.id, ConstraintSet.WRAP_CONTENT)

    connectViewToParent(startSet, view)
    connectViewToParent(endSet, view)

    if (i == 0) {
        startSet.connect(
            view.id,
            ConstraintSet.TOP,
            ConstraintSet.PARENT_ID,
            ConstraintSet.TOP
        )
        endSet.connect(
             view.id,
             ConstraintSet.TOP,
             ConstraintSet.PARENT_ID,
             ConstraintSet.TOP
        )
    } else {
        views[i - 1].let {
            boundTwoViewEnd(endSet, it, view)
            if (i == adapter.count - 1) {
                endSet.connect(
                    view.id,
                    ConstraintSet.BOTTOM,
                    ConstraintSet.PARENT_ID,
                    ConstraintSet.BOTTOM,
                    fromDpToPx(16).toInt()
                )
            }

            boundTwoViewStart(
                startSet, it, view,
                if (i < 3)
                    fromDpToPx(8).toInt()
                else
                    0
            )
        }
    }
    views.add(view)
}