小编Bur*_*man的帖子

我已经看过这个问题：FragmentContainerView using findNavController关于这个问题。但我仍然无法解决问题。它永远不会打开其他片段。我想也许是因为视图绑定，但我尝试在不使用视图绑定的情况下再次执行此操作。还没开啊

MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    private lateinit var navController: NavController
    private lateinit var navHostFragment: NavHostFragment

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        val view = binding.root
        setContentView(view)

        val navHostFragment =
            supportFragmentManager.findFragmentById(R.id.main_nav_host_fragment) as NavHostFragment
        navController = navHostFragment.navController
        binding.bottomNavigationView.setupWithNavController(navController)
        
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            R.id.home -> {
                navHostFragment.navController.popBackStack()
                return true
            }
        }
        return super.onOptionsItemSelected(item)
    }
}

活动主文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    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" …