以下示例代码 CameraFragment.kt 和 activity_main.xml 来自camera-samples项目。

它使用findNavController(requireactivity(),R.id.fragment_container)找到NavController。

我认为这很复杂，我是否可以始终使用findNavController(mView)查找NavController？就像代码A？

CameraFragment.kt

private fun updateCameraUi() {    
       ...          
       Navigation.findNavController(requireactivity(),R.id.fragment_container).navigate(
              CameraFragmentDirections.actionCameraToGallery(outputDirectory.absolutePath))

}

activity_main.xml

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:keepScreenOn="true"
    tools:context=".Mainactivity">

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

</FrameLayout>

代码A

private lateinit var mView: View 

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


Navigation.findNavController(mView).navigate(
           CameraFragmentDirections.actionCameraToGallery(outputDirectory.absolutePath))