Фрагмент связи с деятельностью

Question

У меня вопрос, я создаю приложение для изучения Kotlin, но у меня есть ошибка, и я не могу найти решение.

Я объясняю свою проблему:

IЯ создал проект только с одним действием, в этом упражнении у меня есть bottomNavigationView для изменения моего экрана.Каждый элемент BottomNavigation создает новый фрагмент.

В одном из них (PeopleFragment) я создал viewPager с двумя экранами.На первом экране (OffertionFragment) у меня есть просмотрщик.Я хотел бы щелкнуть по элементу моего recyclerView и заменить его новым фрагментом (выбор будет сделан позже).

Для проверки введите код здесь

Я предоставляю в ваше распоряжение мой код:

class HomeActivity : AppCompatActivity(), SuggestionFragment.suggestionListener {
    val manager = supportFragmentManager
    private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.navigation_search -> {
                startFragment(SearchFragment())
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_favorite -> {
                startFragment(FavoriteFragment())
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_people -> {
                startFragment(PeopleFragment())
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_user -> {
                startFragment(UserFragment())
                return@OnNavigationItemSelectedListener true
            }
        }
        false
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)
        startFragment(SearchFragment())
        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
        val suggestionFragment = SuggestionFragment()
        suggestionFragment.listener = this
    }
    override fun onClick() {
        Log.i("test","log for a test")
        manager.beginTransaction()
                .replace(R.id.fragment_container, SearchFragment())
    }
    fun startFragment(view: Fragment){
        val transaction = manager.beginTransaction()
        val fragment = view
        transaction.replace(R.id.fragment_container, fragment)
        transaction.addToBackStack(null)
        transaction.commit()
    }
}

class PeopleFragment : Fragment(), View.OnClickListener {

    lateinit var adapter: ViewPagerAdapter

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_people, container, false)

    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        val manager = childFragmentManager

        adapter = ViewPagerAdapter(manager)
        adapter.addFragments(SuggestionFragment(), "Suggestion")
        adapter.addFragments(ActivitiesFragment(),"Activités")

        viewPager.adapter = adapter

        tabs.setupWithViewPager(viewPager)
    }

    override fun onClick(v: View?) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }
}

class SuggestionFragment : Fragment(), View.OnClickListener {
    interface suggestionListener {
        fun onClick()
    }
    var listener: suggestionListener? = null

    lateinit var activities: MutableList<Activity> // declaration de la var notes de type liste mutable (car le contenu peut changer)
     lateinit var adapter: ActivityAdapter

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_sugg, container, false)
    }
    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        val manager = childFragmentManager
        activities = mutableListOf<Activity>() // initialisation de la var notes en un tableau mutable de type Note
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))
        activities.add(Activity("Note 1", "45€", "18/20"))

        adapter = ActivityAdapter(activities, this)
        suggestion_recyclerView.layoutManager = LinearLayoutManager(context)
        suggestion_recyclerView.adapter = adapter
    }

    override fun onClick(v: View?) {
        //Log.i("test","sisi")
        listener?.onClick()
    }
}

Надеюсь, вы найдете ответ.