如何在Android上动态更改NavigationUI组件中的默认选项卡

在我的应用程序中，我想显示底部选项卡，当单击这些选项卡时，会显示一个片段。 为此，我使用BottomNavigationView和NavigationUI组件来显示片段

我的XML代码：

但始终显示默认选项卡的项目0

我希望写入条件并选中一个值，然后使用该值设置此NavigationUi和BottomNavigationView的默认选项卡

我该怎么做？

在图中，您可以定义startDestination。 比如：

    val navHostFragment = supportFragmentManager.findFragmentById(R.id.homePage_fragmentNavHost) as NavHostFragment
    val graphInflater = navHostFragment.navController.navInflater
    val navGraph = graphInflater.inflate(R.navigation.home_navigator)
    navGraph.startDestination = R.id.nav_xxxxx
    navController.graph = navGraph
            

    findViewById<BottomNavigationView>(R.id.homePage_bottomNavBar)
        .setupWithNavController(navController)

在图中，您可以定义startDestination。 比如：

    val navHostFragment = supportFragmentManager.findFragmentById(R.id.homePage_fragmentNavHost) as NavHostFragment
    val graphInflater = navHostFragment.navController.navInflater
    val navGraph = graphInflater.inflate(R.navigation.home_navigator)
    navGraph.startDestination = R.id.nav_xxxxx
    navController.graph = navGraph
            

    findViewById<BottomNavigationView>(R.id.homePage_bottomNavBar)
        .setupWithNavController(navController)

    val navHostFragment = supportFragmentManager.findFragmentById(R.id.homePage_fragmentNavHost) as NavHostFragment
    val graphInflater = navHostFragment.navController.navInflater
    val navGraph = graphInflater.inflate(R.navigation.home_navigator)
    navGraph.startDestination = R.id.nav_xxxxx
    navController.graph = navGraph
            

    findViewById<BottomNavigationView>(R.id.homePage_bottomNavBar)
        .setupWithNavController(navController)