如何使用RecyclerView显示空视图？

// 1. 创建RecyclerView布局
<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

// 2. 创建空视图布局
<TextView
    android:id="@+id/emptyView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="No data available"
    android:gravity="center"
    android:visibility="gone" />

// 3. 创建Adapter
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<DataItem> dataList;
    private Context context;

    public MyAdapter(List<DataItem> dataList, Context context) {
        this.dataList = dataList;
        this.context = context;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        if (dataList.isEmpty() && position == 0) {
            // 绑定空视图
            holder.itemView.setVisibility(View.GONE);
            holder.emptyView.setVisibility(View.VISIBLE);
        } else {
            // 绑定数据项视图
            DataItem item = dataList.get(position);
            holder.itemView.setVisibility(View.VISIBLE);
            holder.emptyView.setVisibility(View.GONE);
            // 设置数据项视图的内容
            holder.textView.setText(item.getText());
        }
    }

    @Override
    public int getItemCount() {
        if (dataList.isEmpty()) {
            return 1; // 只有一个空视图
        } else {
            return dataList.size();
        }
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView textView;
        public TextView emptyView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
            emptyView = itemView.findViewById(R.id.emptyView);
        }
    }
}

// 4. 在Activity或Fragment中设置LayoutManager和Adapter
RecyclerView recyclerView = findViewById(R.id.recyclerView);
TextView emptyView = findViewById(R.id.emptyView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
MyAdapter adapter = new MyAdapter(dataList, this);
recyclerView.setAdapter(adapter);

// 5. 控制空视图的显示与隐藏
if (dataList.isEmpty()) {
    recyclerView.setVisibility(View.GONE);
    emptyView.setVisibility(View.VISIBLE);
} else {
    recyclerView.setVisibility(View.VISIBLE);
    emptyView.setVisibility(View.GONE);
}