NoteListActivity.kt

        val adapter = NotesPagedListAdapter {
            launchNoteDetailActivity(this@NoteListActivity, it.noteId)
        }
        viewModel.notes.observe(this, Observer {
            it?.let { adapter.submitList(it) }
        })
        note_list_recyclerview.layoutManager = LinearLayoutManager(this).apply {
            orientation = LinearLayoutManager.VERTICAL
        }
        note_list_recyclerview.adapter = adapter
        val itemTouchHelper = ItemTouchHelper(SwipeToDeleteHandler(this) {
            it.note?.let { viewModel.deleteNote(it) }
            adapter.notifyItemRemoved(it.adapterPosition)
        })
        itemTouchHelper.attachToRecyclerView(note_list_recyclerview)