我有两个片段--第一个片段是课程列表，第二个片段是课程的详细信息。我想从片段1的滚动状态保存回收器视图的状态，但是当我从片段2返回到片段1（带列表）时，列表会滚动到顶部。我的RecyclerView依赖版本是1.2.1，我使用的是：

courseAdapter.stateRestorationPolicy = RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY

但它并不能按预期工作。视频：https://drive.google.com/file/d/1StvDdrFTezO6LJmrQU5vLrrpF_PHdr28/view?usp=sharing
课程片段：

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

    override fun onStart() {
        super.onStart()
        courseId = arguments?.getInt(COURSE_ID, -1) ?: -1
        fetchCourse()
    }

    private fun fetchCourse() {
        courseId?.let {
            showLoadingAnimation()
            sharedCourseViewModel.fetchCourse(it)
        }
    }
...
    private fun initializeView() {
        binding.recyclerView.layoutManager = LinearLayoutManager(context)
        binding.errorLayout.tryAgainBtn.setOnClickListener {
            fetchCourse()
        }
    }
...
    private fun initializeViewModel() = with(binding) {
        showLoadingAnimation()

        sharedCourseViewModel.getCourse().observe(viewLifecycleOwner) { course ->
            if (course?.id == courseId) {
                hideLoadingAnimation()
                if (course == null) {
                    recyclerView.gone()
                    errorLayout.root.visible()
                }
                val courseAdapter = initAdapter
                courseAdapter.stateRestorationPolicy = RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY
                course?.let {
                    (activity as ElearningActivity).setToolbarTitle(course.title)
                    courseAdapter.setItems(course.sections)
                    recyclerView.adapter = courseAdapter
                    loadingInterfaceManager.hideError(errorLayout.root, recyclerView)
                }
            }
        }
    ...
    }

    private fun initAdapter(): CourseAdapter { 
        return CourseAdapter { 
            (activity as BaseChildActivity).navigateToFragment(CourseLessonFragment(), true)
        } 
    }

片段_课程.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/lessons_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:animateLayoutChanges="true"
    android:fitsSystemWindows="true">

    <include
        android:id="@+id/error_layout"
        layout="@layout/error_try_again_layout"
        android:visibility="gone"/>

    <include
        android:id="@+id/loading_layout"
        layout="@layout/loading_layout"
        android:visibility="gone"/>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingVertical="12dp"
        android:background="@color/white"
        android:visibility="gone"/>
</RelativeLayout>