Android德语环境下处理小数点时兼容异常处理

 public class Demo{
   private DecimalFormat decimalFormat = new DecimalFormat("0.0000");
    private void handlerScore() {
        String format = decimalFormat.format(23.23232332);
        getScore(format);
    }

    private float getScore(String score) {
        float result = Float.parseFloat(score);
        Log.d(TAG, "getScore: =" + result);
        return result;
    }
 }

在中文环境下运行正常，但是在德语环境下运行crash，crash信息如下：

 Caused by: java.lang.NumberFormatException: For input string: "23,2323"
                                                     	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
                                                     	at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122)
                                                     	at java.lang.Float.parseFloat(Float.java:451)
                                                     	at com.xiaoma.testc.MainActivity.getScore(MainActivity.java:39)
                                                     	at com.xiaoma.testc.MainActivity.handlerScore(MainActivity.java:33)

分析：
是因为DecimalFormat处理小数位数时变更为23,2323； 中间的【.】变成了【,】，导致了Float.parseFloat(**)报错

解决方案：

  private void handlerScore() {
        String format = decimalFormat.format(23.23232332);
        getScore(format);
    }

    private float getScore(String score) {
        float result;
        try {
            result = Float.parseFloat(score);
        } catch (NumberFormatException exception) {
            String newResult = score.replace(",", ".");
            result = getScore(newResult);
        }
        Log.d(TAG, "getScore: =" + result);
        return result;
    }

其他方案
由于我的项目里返回的值23.23232332是第三方返回的，所以让第三方修改小数位数； 这个可以根据项目调整；

总结
对于掉用系统Api还是需要关注api相关说明，防治潜在的问题。

1、Float做parseFloat(**)处理时抛出异常

package java.lang;
public final class Float extends Number implements Comparable<Float> {

    /**
     * Returns a new {@code float} initialized to the value
     * represented by the specified {@code String}, as performed
     * by the {@code valueOf} method of class {@code Float}.
     *
     * @param  s the string to be parsed.
     * @return the {@code float} value represented by the string
     *         argument.
     * @throws NullPointerException  if the string is null
     * @throws NumberFormatException if the string does not contain a
     *               parsable {@code float}.
     * @see    java.lang.Float#valueOf(String)
     * @since 1.2
     */
    public static float parseFloat(String s) throws NumberFormatException {
        return FloatingDecimal.parseFloat(s);
    }
}

2、Geocoder根据经纬度获取地址列表时是耗时操作

package android.location;
public final class Geocoder {
    /**
     * Returns an array of Addresses that attempt to describe the area immediately surrounding the
     * given latitude and longitude. The returned addresses should be localized for the locale
     * provided to this class's constructor. Results may be obtained by means of a network lookup
     * and this method may take some time to return, and so should not be called on the main thread.
     *
     * Warning: Geocoding services may provide no guarantees on
     * availability or accuracy. Results are a best guess, and are not guaranteed to be meaningful
     * or correct. Do NOT use this API for any safety-critical or regulatory compliance
     * purposes.
     *
     * @param latitude the latitude a point for the search
     * @param longitude the longitude a point for the search
     * @param maxResults max number of addresses to return. Smaller numbers (1 to 5) are recommended
     *
     * @return a list of Address objects. Returns null or empty list if no matches were
     * found or there is no backend service available.
     *
     * @throws IllegalArgumentException if latitude is
     * less than -90 or greater than 90
     * @throws IllegalArgumentException if longitude is
     * less than -180 or greater than 180
     * @throws IOException if the network is unavailable or any other
     * I/O problem occurs
     */
    public List<Address> getFromLocation(double latitude, double longitude, int maxResults)
            throws IOException {
        Preconditions.checkArgumentInRange(latitude, -90.0, 90.0, "latitude");
        Preconditions.checkArgumentInRange(longitude, -180.0, 180.0, "longitude");

        try {
            GeocodeListener listener = new GeocodeListener();
            mService.getFromLocation(latitude, longitude, maxResults, mParams, listener);
            return listener.getResults();
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }
}