how to MODIFY a constraint layout programmatically?

Question

Ive got a view like below :

Answer 1

Disclaimer: I haven't used this specific functionality. This is just my interpretation on how I would try to do it.

I think that what you need is ConstraintSet. After obtaining it, you could modify it and apply it again. This is a relevant example from this article.

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    val constraintSet1 = ConstraintSet()
    constraintSet1.clone(constraintLayout)
    val constraintSet2 = ConstraintSet()
    constraintSet2.clone(constraintLayout)
    constraintSet2.centerVertically(R.id.image, 0)

    var changed = false
    findViewById(R.id.button).setOnClickListener {
        TransitionManager.beginDelayedTransition(constraintLayout)
        val constraint = if (changed) constraintSet1 else constraintSet2
        constraint.applyTo(constraintLayout)
        changed = !changed
    }
}