我有以下需求-一个列表的垂直RecyclerView，它包含一个TextView和一个列表的子垂直RecyclerView。这些数据来自一个API。问题是内部RV不滚动，也不显示所有项目，只显示前4个左右。理想情况下，我希望子RV显示所有项目。有趣的是，如果我使子RV水平，这个问题就消失了。我可以完全滚动并查看所有项目。
我有以下实现。
母体

class TitlesAdapter(
private val titlesList: List<Title>,
private val articlesList: List<Article>
): RecyclerView.Adapter<TitlesAdapter.Holder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
    val binding = TitlesBinding.inflate(LayoutInflater.from(parent.context),parent,false)
    return TitlesBinding.Holder(binding)
}

override fun onBindViewHolder(holder: Holder, position: Int) {
    val itemRow = categoryList.get(position)
    holder.bindRow(itemRow, articlesList)
}

override fun getItemCount(): Int {
    return categoryList.size
}

class Holder(var binding: TitlesBinding): RecyclerView.ViewHolder(binding.root){

  
    fun bindRow(
        title: Title,
        articles: List<Article>
    ) {
            binding.tvTitleName.text = title.name
        val filteredList = articles.filter { it.category == title.id }

        binding.rvChild.adapter = ChildRVAdapter(filteredList)
        binding.rvChild.layoutManager = LinearLayoutManager(itemView.context)
      
    }
}
}

子RV适配器：

class ChildRVAdapter(private val articleList: List<Article>): RecyclerView.Adapter<ChildRVAdapter.Holder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
    val binding = RowArticleBinding.inflate(LayoutInflater.from(parent.context),parent,false)
    return RowArticleBinding.Holder(binding)
}

override fun onBindViewHolder(holder: Holder, position: Int) {
    val itemRow = articleList.get(position)
    holder.bindRow(itemRow)
}

override fun getItemCount(): Int {
    return articleList.size
}

class Holder(var binding: RowArticleBinding): RecyclerView.ViewHolder(binding.root), View.OnClickListener{

    fun bindRow(
        article: Article
    ) {
        binding.tvTitle.text = article.title
        binding.tvDesc.text = article.description
    }
}
}

父RV的xml如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
    android:id="@+id/tv_title_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="20sp"
    android:textColor="@color/textBlack"
    android:fontFamily="@font/playfair_bold"
    android:layout_marginBottom="18dp"
    android:text="Introduction"/>
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/rv_child"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
</LinearLayout>

以及子RV的XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Introduction from Annabel Karmel"
        android:textColor="@color/textBlack"
        android:textSize="14sp"
        android:fontFamily="@font/montserrat_bold"/>
    <TextView
        android:id="@+id/tv_desc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/dustyGrey"
        android:layout_marginTop="6dp"
        android:textSize="14sp"
        android:fontFamily="@font/montserrat_medium"/>
</LinearLayout>