如何在MyAdapter的listview中添加广告

public class MyAdapter extends BaseAdapter {
    private List<Object> mData; // 数据源
    private LayoutInflater mInflater; // 布局解析器
    private int mAdPosition; // 广告位置

    public MyAdapter(Context context, List<Object> data, int adPosition) {
        mData = data;
        mInflater = LayoutInflater.from(context);
        mAdPosition = adPosition;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == mAdPosition) {
            return 0; // 广告项类型
        } else {
            return 1; // 普通项类型
        }
    }

    @Override
    public int getViewTypeCount() {
        return 2; // 广告项和普通项共两种类型
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        int viewType = getItemViewType(position);

        if (convertView == null) {
            holder = new ViewHolder();
            switch (viewType) {
                case 0: // 广告项
                    convertView = mInflater.inflate(R.layout.ad_item_layout, parent, false);
                    holder.adTextView = convertView.findViewById(R.id.ad_text_view);
                    break;
                case 1: // 普通项
                    convertView = mInflater.inflate(R.layout.normal_item_layout, parent, false);
                    holder.normalTextView = convertView.findViewById(R.id.normal_text_view);
                    break;
            }
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        switch (viewType) {
            case 0: // 广告项
                // 设置广告内容
                AdItem adItem = (AdItem) mData.get(position);
                holder.adTextView.setText(adItem.getContent());
                // 设置广告点击事件监听器
                holder.adTextView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // 执行广告点击操作
                        // ...
                    }
                });
                break;
            case 1: // 普通项
                // 设置普通项内容
                NormalItem normalItem = (NormalItem) mData.get(position);
                holder.normalTextView.setText(normalItem.getContent());
                // 设置普通项点击事件监听器
                holder.normalTextView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        // 执行普通项点击操作
                        // ...
                    }
                });
                break;
        }

        return convertView;
    }

    private static class ViewHolder {
        TextView adTextView;
        TextView normalTextView;
    }
}