NumberFormatException - 如果机器人 [英] NumberFormatException - Android

问题描述

我已经上传了我今天的Andr​​oid应用程序市场，我接受了4个错误关于 NumberFormatException异常，Double.parseDouble 和 Double.valueOf 。

I've uploaded my Android app to the Market today, and I received 4 errors regarding NumberFormatException,Double.parseDouble and Double.valueOf.

下面是我的logcat在开发者控制台中看到：

Here's the Logcat I see in the Developer Console:

java.lang.RuntimeException: Unable to start activity ComponentInfo{can.you.drive/can.you.drive.do_drive}: java.lang.NumberFormatException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1816)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
at android.app.ActivityThread.access$1500(ActivityThread.java:132)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4196)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NumberFormatException
at org.apache.harmony.luni.util.FloatingPointParser.parseDblImpl(Native Method)
at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:283)
at java.lang.Double.parseDouble(Double.java:318)
at java.lang.Double.valueOf(Double.java:356)
at can.you.drive.dont_drive.roundTwoDecimals(dont_drive.java:132)
at can.you.drive.do_drive.onCreate(do_drive.java:125)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1780)

下面是其中的错误（根据日志）发生作用 -

Here's the function in which the error occurs(according to the Log) -

public static double roundTwoDecimals(double d) {
    DecimalFormat twoDForm = new DecimalFormat("#.###");
return Double.valueOf(twoDForm.format(d));
}

我知道 D 加倍。

此外，该工作正常在我的手机（Nexus S的运行2.3.4）。我是从其他用户得到的错误。这就是为什么我真的不能调试。

Also, this works fine on my phone(Nexus S running 2.3.4). I'm getting the error from other users. That's why I can't really debug it.

我真的不知道我的这个原因在某些手机上。

I really don't know what my cause this on some phones.

推荐答案

我会说这是要做本地化，以。不是在小数点分隔符发生错误的平台。你为什么不使用四舍五入的更便宜的方法是什么？

I'd say it's got to do with localization, with . not being the decimal separator in the platforms where the error occurs. Why don't you use a less expensive method of rounding?

public double round(double d, int nDecimals)
{
    for(int i=0; i<nDecimals; ++i) d *= 10d;
    d=Math.round(d);
    for(int i=0; i<nDecimals; ++i) d /= 10d;
    return d;
}

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