Android中判断字符是否为中文、韩文、日文

我们经常需要在程序中判断一个字符是否为CJK（Chinese、Japanese、Korean）语言的字符。

例如，在Contacts里面程序需要判断联系人姓名的所属语言。

今天为大家介绍一种NameSplitter中使用的判断字符所属语言的方法。

以判断字符是否为中文为例。

首先，通过guessFullNameStyle函数来判断字符所属语言(使用UnicodeBlock来判断)；

    public static int guessFullNameStyle(String name) {

        if (name == null) {

            return FullNameStyle.UNDEFINED;

        }



        int nameStyle = FullNameStyle.UNDEFINED;

        int length = name.length();

        int offset = 0;

        while (offset < length) {

            int codePoint = Character.codePointAt(name, offset);

            if (Character.isLetter(codePoint)) {

                UnicodeBlock unicodeBlock = UnicodeBlock.of(codePoint);



                if (!isLatinUnicodeBlock(unicodeBlock)) {



                    if (isCJKUnicodeBlock(unicodeBlock)) {

                        // We don't know if this is Chinese, Japanese or Korean -

                        // trying to figure out by looking at other characters in the name

                        return guessCJKNameStyle(name, offset + Character.charCount(codePoint));

                    }



                    if (isJapanesePhoneticUnicodeBlock(unicodeBlock)) {

                        return FullNameStyle.JAPANESE;

                    }



                    if (isKoreanUnicodeBlock(unicodeBlock)) {

                        return FullNameStyle.KOREAN;

                    }

                }

                nameStyle = FullNameStyle.WESTERN;

            }

            offset += Character.charCount(codePoint);

        }

        return nameStyle;

    }

 

    private static int guessCJKNameStyle(String name, int offset) {

        int length = name.length();

        while (offset < length) {

            int codePoint = Character.codePointAt(name, offset);

            if (Character.isLetter(codePoint)) {

                UnicodeBlock unicodeBlock = UnicodeBlock.of(codePoint);

                if (isJapanesePhoneticUnicodeBlock(unicodeBlock)) {

                    return FullNameStyle.JAPANESE;

                }

                if (isKoreanUnicodeBlock(unicodeBlock)) {

                    return FullNameStyle.KOREAN;

                }

            }

            offset += Character.charCount(codePoint);

        }



        return FullNameStyle.CJK;

    }

 

其次，如果获得的结果是CJK，那么我们还要进一步判断到底是Chinese还是Japanese还是Korean

    /**

     * If the supplied name style is undefined, returns a default based on the

     * language, otherwise returns the supplied name style itself.

     * 

     * @param nameStyle See {@link FullNameStyle}.

     */

    public static int getAdjustedFullNameStyle(int nameStyle) {

        String mLanguage = Locale.getDefault().getLanguage().toLowerCase();

        if (nameStyle == FullNameStyle.UNDEFINED) {

            if (JAPANESE_LANGUAGE.equals(mLanguage)) {

                return FullNameStyle.JAPANESE;

            } else if (KOREAN_LANGUAGE.equals(mLanguage)) {

                return FullNameStyle.KOREAN;

            } else if (CHINESE_LANGUAGE.equals(mLanguage)) {

                return FullNameStyle.CHINESE;

            } else {

                return FullNameStyle.WESTERN;

            }

        } else if (nameStyle == FullNameStyle.CJK) {

            if (JAPANESE_LANGUAGE.equals(mLanguage)) {

                return FullNameStyle.JAPANESE;

            } else if (KOREAN_LANGUAGE.equals(mLanguage)) {

                return FullNameStyle.KOREAN;

            } else {

                return FullNameStyle.CHINESE;

            }

        }

        return nameStyle;

    }

恩，大致就是这样。我用Eclipse写了一个小Demo，希望能帮到大家~

附源码链接:

http://pan.baidu.com/s/1gdorERh