FeedActivity.kt

class FeedViewModel : ViewModel(), KoinComponent {
    private val repo: PostRepository by inject()

    fun getFeeds(): Observable<PagedList<Post>> = repo.getFeeds()
}

class FeedActivity : BaseActivity() {
    private lateinit var list: RecyclerView
    private val adapter = FeedAdapter()
    private val viewModel by viewModel<FeedViewModel>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        list.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)
        list.adapter = adapter

        viewModel.getFeeds()
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe {
                adapter.submitList(it)
            }.apply { addDisposable(this) }
    }

    class FeedAdapter : PagedListAdapter<Post, RecyclerView.ViewHolder>(PostDiffUtils) {
        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
            // create view holder as same as you do in RecyclerView.Adapter
        }

        override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
            // bind data as same as you do in RecyclerView.Adapter
        }
    }
}