Recyclerview 仅显示第一项

Question

我的 recyclerview 仅显示 ArrayList 中的第一个项目，当我调试适配器时，它显示 getItemCount() 为 3，看起来不错，据我所知没有运行错误，请帮助：

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这是我的适配器

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class MyAdapter(private val myDataset: ArrayList<String>) :\n    RecyclerView.Adapter<MyAdapter.Holder>() {\n\n\n    override fun onCreateViewHolder(parent: ViewGroup,\n                                    viewType: Int): Holder {\n\n        val view = LayoutInflater.from(parent.context)\n            .inflate(R.layout.list_item, parent, false)\n\n        return Holder(view)\n    }\n\n\n    override fun onBindViewHolder(holder: Holder, position: Int) {\n        holder.textView?.text = myDataset[position]\n    }\n\n\n    override fun getItemCount() = myDataset.size\n\n\n    class Holder(itemView: View) : RecyclerView.ViewHolder(itemView) {\n        var textView:TextView? = null\n\n        init {\n            textView = itemView.findViewById(R.id.name)\n        }\n\n    }\n\n\n}\n

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这是片段：

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class FragmentList1 : Fragment() {\n\n    var myArrayList: ArrayList <String> = arrayListOf("Fausto", "F\xc3\xa9lix", "Nacho")\n\n\n    override fun onCreateView(\n        inflater: LayoutInflater, container: ViewGroup?,\n        savedInstanceState: Bundle?\n    ): View? {\n        // Inflate the layout for this fragment\n\n        var view = inflater.inflate(R.layout.fragment_list1,\n            container, false)\n\n        var recycler: RecyclerView = view.findViewById(R.id.recyclerView)\n\n        recycler.setHasFixedSize(true)\n        recycler.layoutManager = LinearLayoutManager(context)\n        recycler.adapter = MyAdapter(myArrayList)\n\n        return view\n    }\n

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这是fragment_list1.xml：

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    <?xml version="1.0" encoding="utf-8"?>\n<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"\n    xmlns:app="http://schemas.android.com/apk/res-auto"\n    xmlns:tools="http://schemas.android.com/tools"\n    android:layout_width="match_parent"\n    android:layout_height="match_parent"\n    android:orientation="vertical"\n    tools:context=".FragmentList1">\n\n\n    <androidx.recyclerview.widget.RecyclerView\n        android:id="@+id/recyclerView"\n        android:layout_width="match_parent"\n        android:layout_height="match_parent"\n\n        />\n\n</LinearLayout>\n

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这是list_item.xml：

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    <?xml version="1.0" encoding="utf-8"?>\n<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"\n    xmlns:app="http://schemas.android.com/apk/res-auto"\n    xmlns:tools="http://schemas.android.com/tools"\n    android:layout_width="match_parent"\n    android:layout_height="match_parent"\n    android:orientation="horizontal">\n\n    <TextView\n        android:id="@+id/name"\n        android:layout_width="wrap_content"\n        android:layout_height="wrap_content"\n        android:layout_marginStart="4dp"\n        android:layout_marginLeft="4dp"\n        android:layout_marginTop="28dp"\n        android:text="Aqui va el nombre"\n         />\n\n\n\n</LinearLayout>\n

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还有一个 MainActivity 托管fragment_list1.xml，还有 nav_graph.xml

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Answer 1

改变list_item.xml的LinearLayout属性：

android:layout_height="match_parent"

到：

android:layout_height="wrap_content"

因为第一个项目占用了所有可用空间，并且您看不到其余的项目。