为什么数据绑定到RecyclerView中的前几项之前？

如何解决为什么数据绑定到RecyclerView中的前几项之前？

我正在尝试使用https://www.themoviedb.org/ API中的电视节目填充水平的回收站视图。

在我的片段中，我观察到了来自API的实时数据的更改，当更改时，我更新了回收者视图适配器。数据已更新，但是当我在设备上测试数据时，前几个列表项（在屏幕上可见可见）不会显示标题。只有在我向右滚动（以查看屏外项）然后向后滚动后，第一项才会以标题进行更新。

片段

class TelevisionSeriesFragment : Fragment() {

    private lateinit var binding: FragmentTelevisionSeriesBinding

    // lazily initialize the view model so that it's created the first time it is used
    private val viewModel: TelevisionSeriesViewModel by lazy {
        ViewModelProvider(this).get(TelevisionSeriesViewModel::class.java)
    }

    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View? {

        binding = DataBindingUtil.inflate(inflater,R.layout.fragment_television_series,container,false)

        // Allows Data Binding to Observe LiveData with the lifecycle of this Fragment
        binding.lifecycleOwner = this

        binding.viewModel = viewModel

        configureRecyclerViews()
        configureLiveDataObservers()

        return binding.root
    }

    private fun configureRecyclerViews() {
        binding.rvAiringToday.adapter = RVAdapter(viewModel.tvAiringToday.value)
    }

    private fun configureLiveDataObservers() {
        viewModel.tvAiringToday.observe(viewLifecycleOwner,Observer { tvShowList ->
            (binding.rvAiringToday.adapter as RVAdapter).updateData(tvShowList)
        })
    }
}

片段XML

<?xml version="1.0" encoding="utf-8"?>
<layout 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"
xmlns:bind="http://schemas.android.com/apk/res-auto">

<data>
    <variable
        name="viewModel"
        type="io.github.fabiantauriello.moviecatalog.viewmodels.TelevisionSeriesViewModel" />
</data>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ui.TelevisionSeriesFragment"
    android:id="@+id/linearLayout">

    <TextView
        android:id="@+id/tvLatest"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Latest"
        android:textSize="30sp"
        tools:layout_conversion_absoluteHeight="40dp"
        tools:layout_editor_absoluteY="0dp"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_conversion_absoluteWidth="84dp" />

    <include
        android:id="@+id/latest"
        layout="@layout/list_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        bind:title="@{viewModel.tvLatest.title}"
        tools:layout_conversion_absoluteHeight="80dp"
        tools:layout_editor_absoluteY="40dp"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_conversion_absoluteWidth="32dp" />

    <TextView
        android:id="@+id/tvAiringToday"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Airing Today"
        android:textSize="30sp"
        tools:layout_conversion_absoluteHeight="40dp"
        tools:layout_editor_absoluteY="120dp"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_conversion_absoluteWidth="166dp" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvAiringToday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        tools:layout_conversion_absoluteHeight="80dp"
        tools:layout_conversion_absoluteWidth="411dp"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="161dp"
        tools:listitem="@layout/list_item" />

</LinearLayout>

</layout>

列表项XML

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<data>
    <variable
        name="title"
        type="String" />
</data>

<com.google.android.material.card.MaterialCardView
    android:id="@+id/card"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:contentDescription="content description"
            android:scaleType="centerCrop"
            app:srcCompat="@drawable/ic_tv" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="16dp">

            <!-- Title,secondary and supporting text -->
            <TextView
                android:id="@+id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@{title}"
                android:textAppearance="?attr/textAppearanceHeadline6"
                android:textSize="18sp" />

        </LinearLayout>

    </LinearLayout>

</com.google.android.material.card.MaterialCardView>

</layout>

适配器

class RVAdapter(
    private var tvShows: List<TelevisionShow>?
) : RecyclerView.Adapter<RVAdapter.RVHolder>() {

    class RVHolder(
        val binding: ListItemBinding
    ) : RecyclerView.ViewHolder(binding.root)

    // creates view holder
    override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): RVHolder {
        val binding = DataBindingUtil.inflate<ListItemBinding>(
            LayoutInflater.from(parent.context),R.layout.list_item,parent,false
        )
        return RVHolder(binding)
    }

    // binds data to view holder
    override fun onBindViewHolder(holder: RVHolder,position: Int) {
        holder.binding.title.text = tvShows?.get(position)?.title
    }

    override fun getItemCount() = tvShows?.size ?: 0

    fun updateData(newTvShows: List<TelevisionShow>) {
        tvShows = newTvShows
    }
}

Viewmodel

class TelevisionSeriesViewModel : ViewModel() {

    private val LOG_TAG = this::class.simpleName

    private val repository = Repository()

    private val _tvLatest = repository.tvLatest
    val tvLatest: LiveData<TelevisionShow>
        get() = _tvLatest

    private val _tvAiringToday = repository.tvAiringToday
    val tvAiringToday: LiveData<List<TelevisionShow>>
        get() = _tvAiringToday

    init {
        repository.fetchTvData()
    }

}

请帮助：）