如何隐藏某些片段中的底部导航栏

Question

我有一个带有导航图的活动和一个带有 2 个菜单项的底部导航栏。我的问题是我的底部导航栏出现在任何地方，detailFragment，aboutFragment，signInFragment等等。

        val navController = this.findNavController(R.id.myNavHostFragment)
        val appBarConfiguration = AppBarConfiguration.Builder(
            R.id.contactsFragment,
            R.id.profileFragment
        ).build()
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration)
        val navView: BottomNavigationView = findViewById(R.id.nav_view)
        NavigationUI.setupWithNavController(navView, navController)

如何将其限制为仅显示在菜单项的 2 个片段上？

这就是我解决它的方式

    navController.addOnDestinationChangedListener{ _, nd: NavDestination, _->
        if(nd.id == R.id.contactsFragment || nd.id == R.id.profileFragment){
            navView.visibility = View.VISIBLE
        }else{
            navView.visibility = View.GONE
        }

Answer 1

对于应该可见的片段

navView.visibility = View.VISIBLE

不应显示的位置

navView.visibility = View.GONE

Answer 2

您是否正在尝试从当前片段(即主活动或父活动(中隐藏底部导航视图。嗯，就是这么简单。只需转到您不需要底部导航视图的片段，然后在 CreateView 上粘贴以下代码。

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    val view = requireActivity().findViewById<BottomNavigationView>(R.id.nav_view)
    val fab = requireActivity().findViewById<FloatingActionButton>(R.id.fab)
    view.visibility = View.GONE
    fab.visibility = View.GONE
}