Android:西类牙语:解析浮点值时出现问题:应用程序崩溃

Question

Android:西类牙语:解析浮点值时出现问题:应用程序崩溃脚步:

1.在应用程序中将语言设置为西类牙语

2.将一些浮点值格式化为一位小数

3.将格式化值再次解析为float

应用程序崩溃。

示例代码如下:

如果您对此有任何想法，请提供帮助。

 TextView textView = null;
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            textView = (TextView) findViewById(R.id.textview);
            float value = 3.456789f;
            setLocale("es", this);//Set App language as Spanish
            String parsedString = String.format("%.1f", value); // format the float value to single precision 
            float parsedValueFloat = Float.parseFloat(parsedString); // parse the value again to float.(APP Crashesh here)
            textView.setText(parsedValueFloat+"");
    }

        public static void setLocale(String languageCode, Context ctx) {
            Locale locale = new Locale(languageCode);
            Locale.setDefault(locale);
            Configuration config = new Configuration();
            config.locale = locale;
            ctx.getResources().updateConfiguration(config,
                    ctx.getResources().getDisplayMetrics());
        }

崩溃日志如下:

 01-06 20:41:00.265: E/AndroidRuntime(3153): java.lang.RuntimeException: Unable to start      activity ComponentInfo{com.example.testcanvas/com.example.testcanvas.MainActivity}: java.lang.NumberFormatException: Invalid float: "3,5"
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread.access$700(ActivityThread.java:159)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.os.Handler.dispatchMessage(Handler.java:99)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.os.Looper.loop(Looper.java:137)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread.main(ActivityThread.java:5419)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at java.lang.reflect.Method.invokeNative(Native Method)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at java.lang.reflect.Method.invoke(Method.java:525)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at dalvik.system.NativeStart.main(Native Method)
            01-06 20:41:00.265: E/AndroidRuntime(3153): Caused by: java.lang.NumberFormatException: Invalid float: "3,5"
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at java.lang.StringToReal.invalidReal(StringToReal.java:63)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at java.lang.StringToReal.parseFloat(StringToReal.java:310)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at java.lang.Float.parseFloat(Float.java:300)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at com.example.testcanvas.MainActivity.onCreate(MainActivity.java:31)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.Activity.performCreate(Activity.java:5372)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
            01-06 20:41:00.265: E/AndroidRuntime(3153):     ... 11 more

Answer 1

发生这种情况是因为 float / double 到字符串的本地化输出，在这种情况下(以及许多其他语言——您已经注意到西类牙语、意大利语、俄语，还有法语和其他语言)使用逗号而不是句号:

3,5

代替

3.5

因为 Float.parse() 需要一个“en”区域设置格式的字符串，所以方法是使用 NumberFormat类，as per this answer :

NumberFormat nf = NumberFormat.getInstance(Locale.forLanguageTag("es"));
Number parsedNumber = nf.parse(parsedString);
float parsedValueFloat = parsedNumber.floatValue();