试图在 android studio (Kotlin) 中用另一个 Fragment 替换一个 Fragment

Question

我正在尝试创建一个 OnClickListener 来更改 NavController 内部的片段，并且在按下按钮时我一直没有发生任何事情。到目前为止，这是我的代码：

主活动：

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)



        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val navView: BottomNavigationView = binding.navView

        val navController = findNavController(R.id.nav_host_fragment_activity_main)
        
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.navigation_check_in, R.id.navigation_dashboard, R.id.navigation_new_emp
            )
        )
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)
 }

CheckInFragment：

 override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)


        binding.newEmpBtn.setOnClickListener(View.OnClickListener {
            requireActivity().supportFragmentManager.commit {
                replace(R.id.nav_host_fragment_activity_main, NewEmpFragment().newInstance())
                setReorderingAllowed(true)
                addToBackStack(null)
            }
        })

    }

目前，此代码没有给出错误，它似乎无法正常工作，过去几个小时我一直在论坛中搜索。任何想法都会很棒！

Answer 1

我认为您缺少beginTransaction()。你可以试试这个。

    binding.newEmpBtn.setOnClickListener(View.OnClickListener {
       val fragmentManager = parentFragmentManager
       val fragmentTransaction: FragmentTransaction = fragmentManager.beginTransaction()
       fragmentTransaction.replace(
           R.id.nav_host_fragment_activity_main,
           NewEmpFragment()
       )
       fragmentTransaction.addToBackStack(null)
       fragmentTransaction.commit()
    })