Question

我在Android中有一个函数，它获取TextView返回的值 totalcost_venue，totalcost_apparel，totalcost_souvenir和totalcost_caterer。

该值转换为double，然后我必须添加这些值。但是当特定TextView没有返回任何值时，我遇到了错误。任何帮助都可以。谢谢！

double totalcost_venue_finalconverted = Double.parseDouble(totalcost_venue.getText().toString());
double totalcost_apparel_finalconverted = Double.parseDouble(totalcost_apparel.getText().toString());
double totalcost_caterer_finalconverted = Double.parseDouble(totalcost_caterer.getText().toString());
double totalcost_souvenir_finalconverted =  Double.parseDouble(totalcost_souvenir.getText().toString());

double total = (totalcost_venue_finalconverted + totalcost_apparel_finalconverted + totalcost_caterer_finalconverted +totalcost_souvenir_finalconverted);

String total_all= Double.toString(total);

totalcost_all.setText(total_all);
String totalcost_final = totalcost_all.getText().toString();

double budget_converted = Double.parseDouble(budget_event);
double totalcost_converted = Double.parseDouble(totalcost_final);

if(budget_converted <= totalcost_converted){
                registerErrorMsg.setText(" Oops!! Already exceeded");

Answer 1

Double.parseDouble()如果收到空值，或者收到文本，可能会抛出异常。

要使用空值解决您的问题，您可以添加以下检查：

double totalcost_venue_finalconverted = 0;

if(!totalcost_venue.getText().toString().equals("")){
    totalcost_venue_finalconverted = Double.parseDouble(totalcost_venue.getText().toString());
}

TextView不会返回任何Android

1 个答案: