Recyclerview 未显示匹配父级

Question

XML：

<androidx.recyclerview.widget.RecyclerView
   android:visibility="visible"
   android:id="@+id/itemshowRecylerview"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:listitem="@layout/singleitemforrecylerview"/>

Java 代码：

itemshowRecylerview.setLayoutManager(new LinearLayoutManager(MainActivity.this));
        itemshowRecylerview.setHasFixedSize(true);

查看者代码：

 @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.singleitemforrecylerview, null,false);
        return new ItemDetailsAdapter.ViewHolder(view);
    }

Answer 1

您需要更改自定义适配器类，在 inflate 方法中传递 parent 而不是 null

@NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.singleitemforrecylerview, parent,false);
        return new ItemDetailsAdapter.ViewHolder(view);
    }

Answer 2

您已经在 RecyclerView 中使用了这种类型的 RecyclerView 设置方向和 layoutManager，工作代码如下所示。

  <androidx.recyclerview.widget.RecyclerView
                        android:id="@+id/recyclerView"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:orientation="vertical"
           app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
                        app:spanCount="1">
                    </androidx.recyclerview.widget.RecyclerView>

       recyclerView.setAdapter(yourAdapter);