简单的界面设计，通过XML作为记账的主要文件，通过读取XML获取商品的价格，并直接根据物品添加，获得总计的商品价格话费，还是有一定的参考价值的-Simple interface design, through XML as the primary accounting documents, obtained by reading the XML commodity prices, and directly under the item to add, for a total price of t