EditText内容在Listview中每隔4个列表项重复一次

Question

我正在尝试使用listView制作销售屏幕，其中每个listItem都有一个editText供用户输入特定项目的销售数量。我正在使用Array Adapter生成listView。问题是，当我单击editText（例如，位置1）时，在其中键入内容并向下滚动，每第5个位置（位置5、9、13等）会集中注意力，并且键入的内容会自动重复在那些editTexts中。尝试了很多在线资源，但无法找出我在做什么错！预先感谢您的帮助。

class SalesEntryAdapter extends ArrayAdapter<SalesEntry> {
    List<SalesEntry> mList;
    public SalesEntryAdapter(List<SalesEntry> salesList) {
        super(SalesActivity.this, R.layout.listview_sales_item, salesList);
        this.mList = salesList;
    }

    class ViewHolder {
        TextView tv_itemCode;
        TextView tv_itemDescription;
        TextView tv_priceLot;
        TextView tv_tradePrice;
        TextView tv_discPrice;
        TextView tv_salePrice;
        TextView tv_qtyOnHand;
        TextView tv_lineTotal;
        EditText et_saleQty;
        int position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        LayoutInflater inflater = getLayoutInflater();
        double trade_price, net_price;

        if(convertView == null){ // ensures re-usability of views created runtime
            convertView = inflater.from(getContext()).inflate(R.layout.listview_sales_item, parent, false);
            holder = new ViewHolder();
            holder.tv_itemCode = convertView.findViewById(R.id.tv_itemCode);
            holder.tv_itemDescription = convertView.findViewById(R.id.tv_itemDescription);
            holder.tv_priceLot = convertView.findViewById(R.id.tv_priceLot);
            holder.tv_tradePrice = convertView.findViewById(R.id.tv_tradePrice);
            holder.tv_discPrice = convertView.findViewById(R.id.tv_discPrice);
            holder.tv_salePrice = convertView.findViewById(R.id.tv_salePrice);
            holder.tv_qtyOnHand = convertView.findViewById(R.id.tv_qtyOnHand);
            holder.tv_lineTotal = convertView.findViewById(R.id.tv_lineTotal);
            holder.et_saleQty = convertView.findViewById(R.id.et_saleQty);
            convertView.setTag(holder);

        }
        else{
            holder = (ViewHolder) convertView.getTag();
            //convertView.setTag(holder);
        }


        SalesEntry salesEntry = mList.get(position);

        holder.position = position; // save the position in the ViewHolder
        holder.tv_itemCode.setText(salesEntry.get_item_code());
        holder.tv_itemDescription.setText(salesEntry.get_item_desc());
        holder.tv_priceLot.setText(salesEntry.get_price_lot());
        holder.tv_tradePrice.setText(Double.toString(salesEntry.get_trade_price()));
        holder.tv_discPrice.setText(Double.toString(salesEntry.get_net_price()));
        holder.tv_salePrice.setText(Double.toString(salesEntry.get_net_price()));

        holder.et_saleQty.setText(Integer.toString(salesEntry.get_sale_qty()));

        //holder.et_saleQty.setId(position); // this is to set a reference ID for each EditText

        trade_price = salesEntry.get_trade_price();

        /*
        holder.et_saleQty.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            public void onFocusChange(View v, boolean hasFocus) {
                if (!hasFocus){
                    int position = v.getId();
                    EditText saleQty = (EditText) v;
                    //salesList.get(position).sale_qty = Integer.parseInt(saleQty.getText().toString());
                }
            }
        });
        */
        return convertView;

    }
}