将片段重定向到另一个片段

Question

我正在研究很多关于 Kotlin 的知识，并且我有一个项目要完成。所以，我有一些碎片和一个 Activity。左侧菜单中的所有操作都有效，好的。但是在 CalendarioFragment 中，我需要在用户按下按钮时重定向到另一个片段。现在，我不知道该怎么做。我正在使用 Nav Graph，两者都启用了 navhost。

<?xml version="1.0" encoding="utf-8"?>
<navigation 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"
    android:id="@+id/nav_graph">

    <fragment
        android:id="@+id/calendarioFragment"
        android:name="com.example.aprimorandoconhecimentoss.ui.calendario.CalendarioFragment"
        android:label="fragment_calendario"
        tools:layout="@layout/fragment_calendario"
        app:defaultNavHost="true"
        app:navGraph="@navigation/mobile_navigation">
        <action
            android:id="@+id/action_calendarioFragment_to_pdfFragment"
            app:destination="@id/pdfFragment"
            app:launchSingleTop="false" />
    </fragment>
    <fragment
        android:id="@+id/pdfFragment"
        android:name="com.example.aprimorandoconhecimentoss.ui.pdf.PdfFragment"
        android:label="fragment_pdf"
        tools:layout="@layout/fragment_pdf"
        app:defaultNavHost="true"
        app:navGraph="@navigation/mobile_navigation"/>
</navigation>

我的主要Activity:

class MainActivity : AppCompatActivity() {
    
        private lateinit var appBarConfiguration: AppBarConfiguration
        private lateinit var binding: ActivityMainBinding
        private lateinit var pdftela: FragmentPdfBinding
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
    
            val navHostFragment =
                supportFragmentManager.findFragmentById(R.id.calendarioFragment) as NavHostFragment
            val navCont = navHostFragment.navController
    
            binding = ActivityMainBinding.inflate(layoutInflater)
            setContentView(binding.root)
    
            setSupportActionBar(binding.appBarMain.toolbar)
    
            val drawerLayout: DrawerLayout = binding.drawerLayout
            val navView: NavigationView = binding.navView
            val navController = findNavController(R.id.nav_host_fragment_content_main)
    
    
            // Passing each menu ID as a set of Ids because each
            // menu should be considered as top level destinations.
            appBarConfiguration = AppBarConfiguration(
                setOf(
                    R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_calendario_academico
                ), drawerLayout
            )
            setupActionBarWithNavController(navController, appBarConfiguration)
            navView.setupWithNavController(navController)
    
    
        }
    
        override fun onSupportNavigateUp(): Boolean {
            val navController = findNavController(R.id.nav_host_fragment_content_main)
            return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
        }
    }

我尝试将 supportFragmentManager 放在 MainActivity 上，但这样一来，应用程序就会在初始化时崩溃。有没有办法从本地 Fragment 重定向到另一个 Fragment？

class CalendarioFragment : Fragment() {
        
    private var _binding: FragmentCalendarioBinding? = null

    // This property is only valid between onCreateView and
    // onDestroyView.
    private val binding get() = _binding!!
    var navc = NavController

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        val v: View = inflater.inflate(R.layout.fragment_calendario, container, false)



        val listener = view?.setOnClickListener { view ->
            when (view?.id)  {
                R.id.botao_view1->{

                }
            }


        }

        return v
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }

Answer 1

主要活动

var fragment: Fragment? = null

  fragment = CalendarioFragment()
       

        if (fragment != null) {
                val transaction = supportFragmentManager.beginTransaction()
                transaction.replace(R.id.calendarioFragment, fragment)
                transaction.commit()
        }

Answer 2

如果您将一个片段重定向到另一个片段而不破坏前一个片段，请使用这行代码：-

   findNavController.navigate((R.id.calendarioFragment)Yourfragment id in navigation graph)

将片段重定向到另一个片段

Redirect a Fragment to another Fragment

android

kotlin

android-fragments

mobile