如何在使用带有底部导航组件的片段管理器时更改片段工具栏的标签

问：

我有 3 个片段和 1 个活动。, , ,MainActivityCameraFragmentHomeFragmentHistoryFragment

我只想保存所有状态，以便每当用户访问它时，它都不会再次重新创建。HistoryFragment

无论如何，我找到了最常见的解决方案fragmentManager

这是我所有的代码，

MainActivity.kt（主活动.kt）

    class MainActivity : AppCompatActivity() {
    
         private val historyFragment = HistoryFragment()
         private val homeFragment = HomeFragment()
         private val cameraFragment = CameraFragment()
         private val fragmentManager = supportFragmentManager
    
    
         override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
    
         val ft = fragmentManager.beginTransaction()
                   ft.add(R.id.fragmentContainerView, historyFragment, Constants.TAG_HISTORY)
                     .hide(historyFragment)
                     .add(R.id.fragmentContainerView, homeFragment, Constants.TAG_HOME)
    
         cameraViewModel.activeFragment = if (hasPermission()) {
                     //camera
                     ft.add(R.id.fragmentContainerView, cameraFragment, Constants.TAG_CAMERA)
                     ft.hide(homeFragment)
    
                     cameraFragment
             } else {
                     //home
                     homeFragment
                    }
         ft.commit()

         val navHostFragment =
            supportFragmentManager.findFragmentById(R.id.fragmentContainerView) as NavHostFragment
         val navController = navHostFragment.findNavController()
         binding.bottomNav.setupWithNavController(navController)

         binding.bottomNav.setOnItemSelectedListener { item ->
             when (item.itemId) {
                 R.id.historyFragment -> {

                 when (cameraViewModel.activeFragment) {
                    is HomeFragment -> fragmentManager.beginTransaction().hide(cameraViewModel.activeFragment).show(historyFragment).commit()
                 }
         
                cameraViewModel.activeFragment = historyFragment
                item.isChecked = true
                true
            }
            
    }
}

历史片段.kt

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

        binding = FragmentHistoryBinding.inflate(inflater, container, false)

        // tool bar
        (activity as AppCompatActivity).setSupportActionBar(binding.toolBarHistory)

        val appBarConfiguration = AppBarConfiguration(
            setOf(R.id.historyFragment, R.id.homeFragment, R.id.cameraFragment)
        )

        NavigationUI.setupActionBarWithNavController(requireActivity() as AppCompatActivity, findNavController(), appBarConfiguration)

        return binding.root
    }
}

fragment_history.xml中的工具栏

<androidx.appcompat.widget.Toolbar
            android:id="@+id/tool_bar_history"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"/>

问题是当我打开应用程序时，运行然后它显示，当我单击底部导航中的历史项时，它被隐藏并显示，但标题栏中的标签是主页而不是历史记录MainActivityhomeFragmenthomeFragmenthistoryFragment

我使用了 Logcat，并且在调用时检测到：在 historyFragment 中，我获取了 homeFragment 的 idnavController.currentDestination?.id

我希望你能给我这个或任何其他保存片段的方法，没有错误 提前致谢