欧洲版Android版的NumberFormatException？ [英] NumberFormatException on European Versions of Android?

问题描述

我有一个应用程序启动时运行以下两行代码：

I have an app which runs the following two lines of code upon starting:

DecimalFormat decim = new DecimalFormat("#.00");
return Double.parseDouble(decim.format(totalNumberOfCredits));

当我在美式手机上启动应用程序时，价值 decim。格式（totalNumberOfCredits）是 .00 。

When I start the app on my American phone, the value of decim.format(totalNumberOfCredits) is .00.

然而，在我的Google Play开发者控制台中，我有十几次崩溃，其中的所有内容如下所示：

However, in my Google Play Developer Console, I have a dozen crashes, all of which look like this:

Caused by: java.lang.NumberFormatException: Invalid double: ",00"
at java.lang.StringToReal.invalidReal(StringToReal.java:63)
at java.lang.StringToReal.parseDouble(StringToReal.java:269)
at java.lang.Double.parseDouble(Double.java:295)

DecimalFormat是否真的可以在欧洲手机上生成小数的逗号版本？

Is it really possible that DecimalFormat is producing a comma version of the decimal on European phones?

推荐答案

DecimalFormat真的可以在欧洲手机上生成小数的逗号版本吗？

Is it really possible that DecimalFormat is producing a comma version of the decimal on European phones?

$ b $是的，绝对的。这就是要完成，毕竟：

使用给定的模式和默认语言环境的符号创建一个DecimalFormat。当国际化不是主要关注时，这是获取DecimalFormat的一种方便的方法。

Creates a DecimalFormat using the given pattern and the symbols for the default locale. This is a convenient way to obtain a DecimalFormat when internationalization is not the main concern.

要获取给定语言环境的标准格式，请使用NumberFormat上的工厂方法，例如getNumberInstance 。这些工厂将为给定的区域设置返回最合适的NumberFormat子类。

To obtain standard formats for a given locale, use the factory methods on NumberFormat such as getNumberInstance. These factories will return the most appropriate sub-class of NumberFormat for a given locale.

请注意，这不是一个欧洲版Android - 这只是在默认语言环境使用，作为小数分隔符的上下文中使用Android的问题。

Note that this isn't a matter of a "European version of Android" - it's just a matter of using Android in a context where the default locale uses , as the decimal separator.

如果要使用特定区域设置的符号，但使用特定模式，可以使用：

If you want to use the symbols for a particular locale, but using a specific pattern, you could use:

DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(Locale.US);
DecimalFormat format = new DecimalFormat("#.00", symbols);

说完了，你一直都不清楚你在做什么 - 你为什么要格式化然后解析一个数字？当您不需要它们时，几乎总是避免使用字符串转换。为什么不直接转换？ （我们不知道什么 totalNumberOfCredits 是没有帮助的。）

Having said that, it's not at all clear what you're trying to do in the first place - why would you format and then parse a number? You should almost always avoid string conversions when you don't really need them. Why not just convert it directly? (We don't know what totalNumberOfCredits is, which doesn't help.)

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