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fun onCreate() {
    // Step 1
    constraintLayout = LayoutInflater.from(this)
        .inflate(R.layout.empty_constraint_layout, constraintLayout, false)
    titleView = LayoutInflater.from(this)
        .inflate(R.layout.title_view, constraintLayout, false)

    // Step 2
    constraintLayout.addView(titleView)
    setContentView(constraintLayout)

worker8

fun onCreate() {
    // Step 1
    constraintLayout = LayoutInflater.from(this)
        .inflate(R.layout.empty_constraint_layout, constraintLayout, false)
    titleView = LayoutInflater.from(this)
        .inflate(R.layout.title_view, constraintLayout, false)

    // Step 2
    constraintLayout.addView(titleView)

worker8

// ... onCreate()
    // Step 1
    val numberOfTitles = 4
    val titleViewList = mutableListOf()

    for (index in 0 until numberOfTitles) {
        val titleView = LayoutInflater.from(this)
            .inflate(R.layout.title_view, constraintLayout, false)
        titleView.id = View.generateViewId()
        titleViewList.add(titleView)

worker8

// ... onCreate()
    // Step 1
    val contentView = LayoutInflater.from(this)
        .inflate(R.layout.content_view, constraintLayout, false)

worker8

// ... onCreate()
    // Step 2
    titleViewList.forEach { titleView ->
        constraintLayout.addView(titleView)
    }
    constraintLayout.addView(contentView)

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// ... onCreate()
   // Step 3
   val set = ConstraintSet()
   set.clone(constraintLayout)

   val tempTitleView1 = titleViewList[0] // obtain from the list

   set.connect(tempTitleView1.id, ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP)
   set.connect(tempTitleView1.id, ConstraintSet.START, ConstraintSet.PARENT_ID, ConstraintSet.START)
   set.connect(tempTitleView1.id, ConstraintSet.END, ConstraintSet.PARENT_ID, ConstraintSet.END)

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   val set = ConstraintSet()
   set.clone(constraintLayout)
   set.clear(titleView4.id, ConstraintSet.TOP)
   set.applyTo(constraintLayout)

worker8

interface AccordianAdapter {
    fun onCreateViewHolderForTitle(parent: ViewGroup): AccordionView.ViewHolder
    fun onCreateViewHolderForContent(parent: ViewGroup): AccordionView.ViewHolder
    fun onBindViewForTitle(viewHolder: AccordionView.ViewHolder, position: Int, arrowDirection: ArrowDirection)
    fun onBindViewForContent(viewHolder: AccordionView.ViewHolder, position: Int)
    fun getItemCount(): Int
}

worker8

class RandomAdapter(val dataArray: List) : AccordionAdapter {
    override fun onCreateViewHolderForTitle(parent: ViewGroup): AccordionView.ViewHolder {
        return TitleViewHolder.create(parent)
    }

    override fun onCreateViewHolderForContent(parent: ViewGroup): AccordionView.ViewHolder {
        return ContentViewHolder.create(parent)
    }

    override fun onBindViewForTitle(viewHolder: AccordionView.ViewHolder, position: Int, arrowDirection: AccordionAdapter.ArrowDirection) {

worker8

    override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
        val action = event.actionMasked
        val currentPoint = Point(event.x.toInt(), event.y.toInt())

        if (action == MotionEvent.ACTION_DOWN) {
            // mark the beginning, when finger touched down
            initialTouchPoint = Point(currentPoint)
        } else if (action == MotionEvent.ACTION_UP) {
            // reset the marking, when finger is lifted up
            initialTouchPoint = Point(0, 0)