NumberFormatException的Andr​​oid上的欧洲版本？

问题描述

我有一个在启动运行code以下两行的应用程序：

  DecimalFormat的decim =新的DecimalFormat（＃00）;
返回Double.parseDouble（decim.format（totalNumberOfCredits））;
 

当我启动应用程序，我的美国手机上，的decim.format值（totalNumberOfCredits）是 .00 。

不过，在我的谷歌Play开发者控制台，我有一打崩溃，所有这一切看起来是这样的：

 产生的原因：java.lang.NumberFormatException：无效的双，00
在java.lang.StringToReal.invalidReal（StringToReal.java:63）
在java.lang.StringToReal.parseDouble（StringToReal.java:269）
在java.lang.Double.parseDouble（Double.java:295）
 

难道真的可能是DecimalFormat的欧洲手机生产小数点逗号的版本？

解决方案

Yes, absolutely. That's what it's meant to do, after all:

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.

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);

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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