使用导航组件在不同的图形之间导航

dependencies {
    def nav_version = "2.5.3" // 请使用最新版本
    implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
    implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
}

<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nav_graph"
    app:startDestination="@id/homeFragment">

    <fragment
        android:id="@+id/homeFragment"
        android:name="com.example.app.HomeFragment"
        tools:layout="@layout/fragment_home" />
    <fragment
        android:id="@+id/detailFragment"
        android:name="com.example.app.DetailFragment"
        tools:layout="@layout/fragment_detail" />
</navigation>

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/nav_host_fragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:navGraph="@navigation/nav_graph"
    app:defaultNavHost="true" />

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
        val navController = navHostFragment.navController

        // 可选：设置ActionBar与导航控制器关联
        setupActionBarWithNavController(navController)
    }

    override fun onSupportNavigateUp(): Boolean {
        val navController = findNavController(R.id.nav_host_fragment)
        return navController.navigateUp() || super.onSupportNavigateUp()
    }
}

navController.navigate(R.id.detailFragment)

<fragment
    android:id="@+id/homeFragment"
    android:name="com.example.app.HomeFragment"
    tools:layout="@layout/fragment_home">
    <action
        android:id="@+id/action_homeFragment_to_detailFragment"
        app:destination="@id/detailFragment" />
</fragment>

navController.navigate(R.id.action_homeFragment_to_detailFragment)

navController.navigate(R.id.action_homeFragment_to_detailFragment) ?: return

navController.navigate(R.id.detailFragment) {
    navController.graph.startDestinationRoute?.let { route ->
        popUpTo(route) {
            saveState = true
        }
    }
    launchSingleTop = true
}