Android导航架构组件-获取当前可见片段

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

        // 获取当前目的地
        val currentDestination = navController.currentDestination
        Log.d("Navigation", "Current Destination: ${currentDestination?.id}")

        // 获取当前可见的Fragment
        val currentFragment = navHostFragment.childFragmentManager.fragments.firstOrNull { it.isVisible }
        Log.d("Navigation", "Current Fragment: ${currentFragment?.javaClass.simpleName}")
    }
}