如何修复，复选框未选中使用代码自定义适配器的微调？

public class CustomAdapter extends ArrayAdapter<Item> {
    private ArrayList<Item> itemList;

    public CustomAdapter(Context context, ArrayList<Item> itemList) {
        super(context, 0, itemList);
        this.itemList = itemList;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
        }

        Item currentItem = itemList.get(position);

        CheckBox checkBox = convertView.findViewById(R.id.checkbox);
        checkBox.setOnCheckedChangeListener(null); // 清除之前的监听器

        checkBox.setChecked(currentItem.isSelected());
        checkBox.setTag(position); // 设置唯一标识符

        checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int pos = (int) buttonView.getTag(); // 获取唯一标识符
                itemList.get(pos).setSelected(isChecked); // 更新数据源中的状态
            }
        });

        return convertView;
    }
}