今天接到一个波兰的客户说有个APP在英文状态下一切运行正常，但是当系统语言切换到波兰语言的时候，程序奔溃了。好吧，又是我来维护。

    好吧，先把系统语言切换到波兰语，切换到波兰语的方法查看文章

我的Android进阶之旅------>Android【设置】-【语言和输入法】-【语言】列表中找到相应语言所对应的列表项  

地址：http://blog.csdn.net/ouyang_peng/article/details/50209789

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报错如下：

D/AndroidRuntime( 9067): Shutting down VM
E/AndroidRuntime( 9067): FATAL EXCEPTION: main
E/AndroidRuntime( 9067): Process: com.runbo.outdoormeter, PID: 9067
E/AndroidRuntime( 9067): java.lang.NumberFormatException: Invalid float: "1019,35"
E/AndroidRuntime( 9067):        at java.lang.StringToReal.invalidReal(StringToReal.java:63)
E/AndroidRuntime( 9067):        at java.lang.StringToReal.initialParse(StringToReal.java:164)
E/AndroidRuntime( 9067):        at java.lang.StringToReal.parseFloat(StringToReal.java:323)
E/AndroidRuntime( 9067):        at java.lang.Float.parseFloat(Float.java:306)
E/AndroidRuntime( 9067):        at java.lang.Float.valueOf(Float.java:343)
E/AndroidRuntime( 9067):        at com.runbo.outdoormeter.service.DataService.onSensorChanged(DataService.java:66)
E/AndroidRuntime( 9067):        at android.hardware.SystemSensorManager$SensorEventQueue.dispatchSensorEvent(SystemSensorManager.java:405)
E/AndroidRuntime( 9067):        at android.os.MessageQueue.nativePollOnce(Native Method)
E/AndroidRuntime( 9067):        at android.os.MessageQueue.next(MessageQueue.java:148)
E/AndroidRuntime( 9067):        at android.os.Looper.loop(Looper.java:151)
E/AndroidRuntime( 9067):        at android.app.ActivityThread.main(ActivityThread.java:5637)
E/AndroidRuntime( 9067):        at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 9067):        at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime( 9067):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
E/AndroidRuntime( 9067):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

LocationApplication.dangxia_qiya=event.values[0];
Log.i("sensor","senser is running  1.....");
float a1=LocationApplication.dangxia_qiya;
String aa1=String.format("%.2f",a1);
Log.i("sensor","a1="+a1);
Log.i("sensor","aa1="+aa1);
LocationApplication.dangxia_qiya=Float.valueOf(aa1);

C:\Documents and Settings\Administrator>adb logcat -s sensor
--------- beginning of system
--------- beginning of main
I/sensor  ( 8175): senser is running  1.....
I/sensor  ( 8175): a1=1019.00757
I/sensor  ( 8175): aa1=1019,01

这说明，得到的a1参数是正常的，只是通过String.format方法转换后，就变成了1019,01。坑爹啊！将系统语言切换为英文，再打印下日志，如下：

C:\Documents and Settings\Administrator>adb logcat -s sensor
--------- beginning of system
--------- beginning of main
I/sensor  ( 8648): senser is running  1.....
I/sensor  ( 8648): a1=1019.01685
I/sensor  ( 8648): aa1=1019.02

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       好吧，看了代码后，感觉用String.format来格式化浮点型数字真心不给力。这个保留小数点后两位的问题还是用其他方法来解决吧。将代码改成下面代码后一切正常。

LocationApplication.dangxia_qiya=event.values[0];
Log.i("sensor","senser is running  1.....");
float a1=LocationApplication.dangxia_qiya;
//String aa1=String.format("%.2f",a1);
//Log.i("sensor","a1="+a1);
//Log.i("sensor","aa1="+aa1);
//LocationApplication.dangxia_qiya=	Float.valueOf(aa1);
float  aa1   =  (float)(Math.round(a1*100))/100;
Log.i("sensor","a1="+a1);
Log.i("sensor","aa1="+aa1);
LocationApplication.dangxia_qiya=aa1;

不知道String.format()这样的错误，是不是java设计时候的一个缺陷呢？