This implementation is quite straightforward. We will inflate the XML layout that we defined for the individual articles, and find the views that will be used to display the information:

override fun onCreateViewHolder(parent: ViewGroup,
                                viewType: Int): ViewHolder {
    val layout = LayoutInflater.from(parent.context)
            .inflate(R.layout.article, parent, false) as LinearLayout

    val feed = layout.findViewById<TextView>(R.id.feed)
    val title = layout.findViewById<TextView>(R.id.title)
    val summary = layout.findViewById<TextView>(R.id.summary)

    return ViewHolder(layout, feed, title, summary)
}

Now each time a new ViewHolder is needed, this function will be called.