如何从ArrayList添加价格

Question

ArrayList<ProductModel> products = new ArrayList<>();

我需要将某些食品的进餐价格和进餐数量相乘，得出总计。

所以，这是我的代码。请帮帮我

double totalPrices = Double.parseDouble(productModel.getMealprice()) + Double.parseDouble(productModel.getMealqty());

            for (int i = 0; i < products.size(); i++) {

                    totalPrices += products.get(i);
            }

            tv_totalamount.setText("Total Amount to be Paid : " + totalPrices + "");

Answer 1

一些小技巧可以解决您的问题。

double totalPrices = Double.parseDouble(productModel.getMealprice()) + Double.parseDouble(productModel.getMealqty());

                for (int i = 0; i < products.size(); i++) {

                        totalPrices += products.get(i).getPrice();
                }

                tv_totalamount.setText("Total Amount to be Paid : " + totalPrices + "");