ConstraintLayout transition animations

SearchFragment.kt

    private val transition = AutoTransition().apply {
        duration = 250
        interpolator = AccelerateInterpolator()
    }
    private var cs = ConstraintSet()

    override fun showSearchEngineIcon() {
        cs.clone(searchViewConstraintLayout)
        cs.connect(searchView.id, ConstraintSet.START, searchEngineIconImageView.id, ConstraintSet.END)
        cs.setAlpha(searchEngineIconImageView.id, 1F)
        TransitionManager.beginDelayedTransition(searchViewConstraintLayout, transition)
        cs.applyTo(searchViewConstraintLayout)
    }

    override fun hideSearchEngineIcon() {
        cs.clone(searchViewConstraintLayout)
        cs.connect(searchView.id, ConstraintSet.START, ConstraintSet.PARENT_ID, ConstraintSet.START)
        cs.setAlpha(searchEngineIconImageView.id, 0F)
        TransitionManager.beginDelayedTransition(searchViewConstraintLayout, transition)
        cs.applyTo(searchViewConstraintLayout)
    }