Kotlin RecyclerView.Adapter - credits to Fernando Cejas

KotlinRecycler.kt

class MyAdapter : RecyclerView.Adapter<ViewHolder>() {
    var data: List<MyClass> by Delegates.observable(emptyList()) {
            _, _, _ -> notifyDataSetChanged()
    }

    internal var clickListener: (MyClass) -> Unit = { }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
        ViewHolder(parent.inflate(R.layout.data_row))

    override fun getItemCount() = data.size

    override fun onBindViewHolder(viewHolder: ViewHolder, position: Int) =
        viewHolder.bind(data[position], clickListener)

    class ViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
        fun bind(item: MyClass, clickListener: (MyClass) -> Unit) {
            // do all the view bindings and set the listener
            itemView.setOnClickListener { clickListener(item) }
        }

    }
}

MyExtensions.kt

fun ViewGroup.inflate(@LayoutRes layoutRes: Int): View =
        LayoutInflater.from(context).inflate(layoutRes, this, false)

MyFragment.kt

private fun initializeView() {
    // set layout manager here or in the layout xml
    myRecyclerView.adapter = myAdapter
    myAdapter.clickListener = { data ->
        // do something with data
        // like change something or navigate
    }
}

private fun renderData(items: List<MyClass>?) {
    myAdapter.data = items.orEmpty()
}