在RecyclerView中点击item时，如何更改Alpha值？

// 在RecyclerView的Adapter中为每个item设置点击事件监听器
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<Item> itemList;
    private OnItemClickListener listener;

    public interface OnItemClickListener {
        void onItemClick(int position);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    // ViewHolder类和其他必要的方法省略...

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {
        // 设置item的点击事件监听器
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (listener != null) {
                    listener.onItemClick(position);
                }
            }
        });
    }
}

MyAdapter adapter = new MyAdapter(itemList);
adapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {
    @Override
    public void onItemClick(int position) {
        // 获取被点击的item的View
        View clickedView = recyclerView.getLayoutManager().findViewByPosition(position);
        // 设置Alpha值
        clickedView.setAlpha(0.5f);
    }
});
recyclerView.setAdapter(adapter);