Klasa fragmentu który wyświetla text

class DisplayingFragment : Fragment() {
    private lateinit var  model: MessageViewModel


    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        model.getTextData().observe(this, Observer { message ->
            textViewDisplaying.text = message
        })


        return inflater.inflate(R.layout.fragment_displaing, container, false)
    }


    override fun onAttach(context: Context?) {
        super.onAttach(context)

        model = ViewModelProviders.of(this.activity!!).get(MessageViewModel::class.java)
    }
}