**************** MainActivity (onCreate) ***************
storiesContainerAdapter = StoriesContainerAdapter(applicationContext)
postsContainerAdapter = PostsContainerAdapter(applicationContext)
recyclerView.apply {
      layoutManager = LinearLayoutManager(applicationContext)
      adapter = MergeAdapter(storiesContainerAdapter, postsContainerAdapter)
}



*************** PostsContainerAdapter *****************
class PostsContainerAdapter(private var context: Context): RecyclerView.Adapter<PostsContainerAdapter.PostsContainerHolder>() {

    lateinit var recyclerView: RecyclerView
    private var config: PagedList.Config
    private var pagedList: PagedList<Post>
    var postAdapter: PostAdapter = PostAdapter(context)

    init {
        val dataSource = MyPositionalDataSource(MainRepository())

        config = PagedList.Config.Builder()
            .setEnablePlaceholders(false)
            .setPageSize(2)
            .build()

        pagedList = PagedList.Builder(dataSource, config)
            .setFetchExecutor(Executors.newSingleThreadExecutor())
            .setNotifyExecutor(MainActivity.MainThreadExecutor())
            .build()

        postAdapter.submitList(pagedList)
    }

    override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
        this.recyclerView = recyclerView
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PostsContainerHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.posts_container, parent, false)
        return PostsContainerHolder(view)
    }

    override fun getItemCount(): Int {
        return 1
    }

    override fun onBindViewHolder(holder: PostsContainerHolder, position: Int) {
        holder.bind()
    }

    inner class PostsContainerHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val recyclerViewPosts: RecyclerView = itemView.recyclerViewPosts
        fun bind(){
            recyclerViewPosts.layoutManager = LinearLayoutManager(context)
            recyclerViewPosts.adapter = postAdapter
        }
    }

}


*********************** posts_container.xml **************************
<?xml version="1.0" encoding="utf-8"?>
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerViewPosts"
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="wrap_content">

</androidx.recyclerview.widget.RecyclerView>