Android 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

我得到了3个片段和1个活动.MainActivity、CameraFragment、HomeFragment、HistoryFragment

我只想保存所有HistoryFragment个状态，这样无论何时用户访问它，它都不会再有recreated个状态.

不管怎样，我已经找到了最常见的解决方案

这是我所有的代码，

MainActivity.kt个

    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
            }
            
    }
}

HistoryFragment.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
    }
}

toolbar in fragment_history.xml

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

problem是我打开应用程序时，MainActivity运行，然后它显示homeFragment，当我点击bottom navigation中的history项时，homeFragment显示hide，它显示shows historyFragment，但标题栏not History中有标签Home

我已经使用了logcat，并且我检测到当我调用:navController.currentDestination?.id in historyFragment时，我得到的是homeFragment的id

我希望你能给我解决这个问题的办法，或者任何其他方法，让我save fragment岁的时候不会有虫子 先谢谢你