试图在android工作室中用另一个片段替换一个片段(Kotlin)

Question

我正在尝试创建一个OnClickListener，它可以更改NavController内部的片段，但按下按钮时却没有任何结果。这是我到目前为止的代码：

主要活动：

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，这段代码没有给出错误，只是似乎不起作用，我在过去的几个小时里一直在论坛上搜索。任何想法都会很棒！

Answer 1

我想您缺少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()
})