我有一个应用程序，其中每个页面/内容都是一个片段，在此之上，我有一个应用程序菜单栏片段，其中包含用于导航页面（片段）的按钮。我的问题是，如果我多次按下应用栏的同一个按钮，并且在我按下默认的手机后退按钮（左箭头）后，它不会立即返回到之前的页面，但它会在每次按下同一个按钮时导航相同的片段，导致留在同一个页面上。
我按了10次“收藏夹”页面的导航键，如果我想回到主页，我必须按10次“后退”按钮。
类MainActivity：public void run（）{

private val TAG = "MainActivity"
private var currentFragment: Fragment? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    if (savedInstanceState != null) {
        // Ripristina il fragment corrente
        currentFragment = supportFragmentManager.getFragment(savedInstanceState, "currentFragment")
    } else {
        // Crea e visualizza il fragment iniziale
        currentFragment = RecyclerFragment()
        supportFragmentManager.beginTransaction()
            .replace(R.id.container_main, currentFragment!!)
            .commit()
    }

    val fragment = AppbarFragment()
    supportFragmentManager.beginTransaction()
        .replace(R.id.container_appbar, fragment)
        .commit()
}

override fun onSaveInstanceState(outState: Bundle) {
    super.onSaveInstanceState(outState)
    // Salva lo stato del fragment corrente
    if (currentFragment != null) {
        supportFragmentManager.putFragment(outState, "currentFragment", currentFragment!!)
    }
}

}
类AppbarFragment：public void run（）{

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setHasOptionsMenu(true)

}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    inflater.inflate(R.menu.app_bar, menu)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return when (item.itemId) {
        R.id.action_favourites -> {
            val favouritesFragment = FavouritesFragment() // Crea un'istanza del fragment delle preferite
            requireActivity().supportFragmentManager.beginTransaction()
                .replace(R.id.container_main, favouritesFragment) // Sostituisci il fragment corrente con il fragment delle preferite
                .addToBackStack(null) // Aggiungi la transazione alla back stack per consentire il ritorno al fragment precedente
                .commit()
            true
        }
        R.id.action_search -> {
            val searchFragment = SearchFragment() // Crea un'istanza del fragment di ricerca
            requireActivity().supportFragmentManager.beginTransaction()
                .replace(R.id.container_main, searchFragment) // Sostituisci il fragment corrente con il fragment di ricerca
                .addToBackStack(null) // Aggiungi la transazione alla back stack per consentire il ritorno al fragment precedente
                .commit()
            true
        }
        else -> super.onOptionsItemSelected(item)
    }
}

}我是新来的，我不知道是否有一个快速修复，或者也许我只是没有按照预期使用片段功能。