因此，我在片段A中有一个GoogleMap，每当我从底部导航栏中选择片段B并再次选择片段A时，Map会重新初始化。然而，如果我通过回按返回片段A，则mapview会恢复到先前的状态。

private fun setupBottomNavigationBar() {
    val navHostFragment = supportFragmentManager.findFragmentById(R.id.navigationContainer) as NavHostFragment
    navHostFragment.navController.setGraph(R.navigation.main_graph)
    NavigationUI.setupWithNavController(binding.bottomNavigationBar, navHostFragment.navController)

    binding.bottomNavigationBar.setOnItemReselectedListener {
        // Do nothing to ignore the reselection
    }
}

字符串
片段事务由NavigationWeb本身处理。

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_graph"
app:startDestination="@id/home_graph">

<include app:graph="@navigation/home_graph"/>
<include app:graph="@navigation/captain_portal_graph"/>
<include app:graph="@navigation/accounts_graph"/>

</navigation>

型
我的fragments扩展了这个BaseFragment：

abstract class BaseFragment<TViewBinding : ViewDataBinding> : Fragment() {

private var innerBinding: TViewBinding? = null
protected val binding: TViewBinding get() = innerBinding ?: throw IllegalStateException("Trying to access the binding outside of the lifecycle.")

abstract val layoutId: Int

protected val baseActivity: BaseActivity<*>
    get() = activity as BaseActivity<*>

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    innerBinding = DataBindingUtil.inflate(inflater, layoutId, container, false)
    return binding.root
}

override fun onStart() {
    super.onStart()
    setupActionBar()
}

override fun onDestroyView() {
    super.onDestroyView()
    innerBinding = null
}

型
这个来自Google的官方sample正在按预期工作，我想实现相同的行为，我做错了什么？