FragmentOne.kt

class FragmentOne: Fragment() {
    @Inject
    lateinit var navEvents: PublishProcessor<NavEvent>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        (context!!.applicationContext as App).di.inject(this)
    }
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View =
            inflater.inflate(R.layout.fragment_one, container, false)

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        button.setOnClickListener {
            navEvents.onNext(NavEvent(NavEvent.Destination.TWO))
        }
    }

}