Android 中 Listview 项的总和

Question

我有显示在图像中的列表视图。但现在我想要金额列双值的总和并显示在 ListView 下方的 One TextView 中。那么如何执行这个操作。

适配器代码：

 public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.simple_casehistory, null);
            holder = new ViewHolder();
            holder.qty = (TextView) convertView.findViewById(R.id.cqty);
            holder.rate = (TextView) convertView.findViewById(R.id.crate);
            holder.amount = (TextView) convertView.findViewById(R.id.camount);  

holder.qty.setText(dataItems.get(position).GetQtyName()); 

     holder.rate.setText(dataItems.get(position).GetRateName());
        holder.amount.setText(dataItems.get(position).GetAmountName());               


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


        return convertView;
    }
    static class ViewHolder{
        TextView qty;
        TextView rate;
        TextView amount;

    }

Answer 1

试试这个示例代码：

public double getTotal(ArrayList<YourItem> list){

    double total=0.0;
    for(int i=0;i<list.size();i++){
        total=total+Double.parseDouble(list.get(i).getAmount());
    }
    return total;
}