我正在尝试使用Android上的递归目录搜索将带有文件名的搜索字符串进行匹配。问题在于字符是日语,在某些情况下不匹配。例如,我要匹配文件名开头的搜索字符串是“呼ぶ”。当我从file.getName()打印文件名时,这可以准确反映出来,例如打印到控制台的文件名以“呼ぶ”开头。但是当我对搜索字符串进行匹配时,例如fileName.startwith(“呼ぶ”),不匹配。

事实证明,当我打印要搜索的文件名的子字符串时,第二个字符不同–单词是“呼ふ”而不是“呼ぶ”。如果我提取字节并打印十六进制字符,则最后一个字节偏移1 –大概是“ぶ”和“ふ”之间的差。

这是用于显示差异的代码:

    String name = soundFile.getName();
    String string1 = question.kanji;


    Log.d(TAG, "searching for : s1:" + question.kanji + " + " + question.hiragana + " + " + question.english);
    Log.d(TAG, "name is: " + name);

    Log.d(TAG, "question.kanaji.length(): " + question.kanji.length());
    Log.d(TAG, "question.hiragana.length(): " + question.hiragana.length());


    String compareStart = name.substring(0, string1.length() );

    Log.d(TAG, "string1.length(): " + string1.length());
    Log.d(TAG, "compareStart.length(): " + compareStart.length());

        byte[] nameUTF8 = null;
    byte[] s1UTF8 = null;
    byte[] csUTF8 = null;

    nameUTF8 = name.getBytes();
    s1UTF8 = string1.getBytes();
    csUTF8 = compareStart.getBytes();


    Log.d(TAG, "nameUTF8.length: " + s1UTF8.length);
    Log.d(TAG, "s1UTF8.length: " + s1UTF8.length);
    Log.d(TAG, "csUTF8.length: " + csUTF8.length);

    for (int i = 0; i < s1UTF8.length; i++) {
        Log.d(TAG, "s1UTF8[i]: " + Integer.toString(s1UTF8[i] & 0xff, 16).toUpperCase());
    }

    for (int i = 0; i < csUTF8.length; i++) {
        Log.d(TAG, "csUTF8[i]: " + Integer.toString(csUTF8[i] & 0xff, 16).toUpperCase());
    }

    for (int i = 0; i < nameUTF8.length; i++) {
        Log.d(TAG, "nameUTF8[i]: " + Integer.toString(nameUTF8[i] & 0xff, 16).toUpperCase());
    }


部分输出如下:

D/AnswerView(12078): searching for : s1:呼ぶ + よぶ + to call out,to invite
D/AnswerView(12078): name is: 呼ぶ                                                     よぶ                 to call out,to invite.mp3
D/AnswerView(12078): question.kanaji.length(): 2
D/AnswerView(12078): question.hiragana.length(): 2
D/AnswerView(12078): string1: 呼ぶ
D/AnswerView(12078): compareStart: 呼ふ
D/AnswerView(12078): string1.length(): 2
D/AnswerView(12078): compareStart.length(): 2
D/AnswerView(12078): string1.length(): 2
D/AnswerView(12078): compareStart.length(): 2
D/AnswerView(12078): nameUTF8.length: 6
D/AnswerView(12078): s1UTF8.length: 6
D/AnswerView(12078): csUTF8.length: 6
D/AnswerView(12078): s1UTF8[i]: E5
D/AnswerView(12078): s1UTF8[i]: 91
D/AnswerView(12078): s1UTF8[i]: BC
D/AnswerView(12078): s1UTF8[i]: E3
D/AnswerView(12078): s1UTF8[i]: 81
D/AnswerView(12078): s1UTF8[i]: B6
D/AnswerView(12078): csUTF8[i]: E5
D/AnswerView(12078): csUTF8[i]: 91
D/AnswerView(12078): csUTF8[i]: BC
D/AnswerView(12078): csUTF8[i]: E3
D/AnswerView(12078): csUTF8[i]: 81
D/AnswerView(12078): csUTF8[i]: B5
D/AnswerView(12078): nameUTF8[i]: E5
D/AnswerView(12078): nameUTF8[i]: 91
D/AnswerView(12078): nameUTF8[i]: BC
D/AnswerView(12078): nameUTF8[i]: E3
D/AnswerView(12078): nameUTF8[i]: 81
D/AnswerView(12078): nameUTF8[i]: B5
D/AnswerView(12078): nameUTF8[i]: E3
D/AnswerView(12078): nameUTF8[i]: 82
D/AnswerView(12078): nameUTF8[i]: 99
D/AnswerView(12078): nameUTF8[i]: 20
D/AnswerView(12078): nameUTF8[i]: 20
D/AnswerView(12078): nameUTF8[i]: 20
D/AnswerView(12078): nameUTF8[i]: 20


显示提取的文件名子字符串的第六个字节以及文件名本身是“ B5”,而不是搜索字符串中的“ B6”。但是,正确显示了打印的文件名。我很困惑当基础字符不同时,为什么文件名正确显示在控制台上?为什么在文件名的开头再增加3个非空字节-某种程度上不需要在搜索字符串中表示“ぶ”字符?

最佳答案

该问题似乎是规范化形式之一。我知道在Mac上,例如,文件系统始终在NFD中。但是您发布的字符串在NFC中。看:

% cat /tmp/u
呼ぶ

% uwc /tmp/u
   Paras    Lines    Words   Graphs    Chars    Bytes File
       0        1        1        3        3        7 /tmp/u

% uniquote -v  /tmp/u
\N{CJK UNIFIED IDEOGRAPH-547C}\N{HIRAGANA LETTER BU}

% nfd /tmp/u | uniquote -v
\N{CJK UNIFIED IDEOGRAPH-547C}\N{HIRAGANA LETTER HU}\N{COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK}

% nfc /tmp/u | uniquote -v
\N{CJK UNIFIED IDEOGRAPH-547C}\N{HIRAGANA LETTER BU}


因此,我认为您将不得不考虑转换为NFD。

顺便说一句,U + 547C CJK代码点恰好来自Unihan数据库:

 呼 U+547C Lo Han    CJK UNIFIED IDEOGRAPH-547C
  Mandarin     hu1 xu1
  Cantonese    fu1
  JapaneseKun  yobu
  JapaneseOn   ko
  Korean       ho
  HanyuPinlu   hu1(378) hu5(107)
  Vietnamese   hô

10-07 19:53
查看更多