从java.text.Normalizer开始。

string = Normalizer.normalize(string, Normalizer.Form.NFD);
// or Normalizer.Form.NFKD for a more "compatible" deconstruction 

这将从大多数字符中分离所有重音符号。然后，你只需要将每个字符与字母进行比较，并排除那些不是字母的字符。

string = string.replaceAll("[^\\p{ASCII}]", "");

如果你的文本是Unicode，你应该使用这个:

string = string.replaceAll("\\p{M}", "");

对于Unicode， \\P{M}匹配基本字形，\\P{M}(小写)匹配每个重音。

感谢GarretWilson提供的指针和正则表达式.info提供的Unicode指南。

需要注意的是，Normalizer本身不足以删除变音符。例如，下面的代码不会将重音的é替换为不重音的e:

import static java.text.Normalizer.normalize;
import static java.text.Normalizer.Form.*;

public class T {
  public static void main( final String[] args ) {
    final var text = "Brévis";

    System.out.println(
      normalize( text, NFD ) + " " + 
      normalize( text, NFC ) + " " + 
      normalize( text, NFKD ) + " " + 
      normalize( text, NFKC )
    );
  }
}

从java.text.Normalizer开始。

string = Normalizer.normalize(string, Normalizer.Form.NFD);
// or Normalizer.Form.NFKD for a more "compatible" deconstruction 

这将从大多数字符中分离所有重音符号。然后，你只需要将每个字符与字母进行比较，并排除那些不是字母的字符。

string = string.replaceAll("[^\\p{ASCII}]", "");

如果你的文本是Unicode，你应该使用这个:

string = string.replaceAll("\\p{M}", "");

对于Unicode， \\P{M}匹配基本字形，\\P{M}(小写)匹配每个重音。

感谢GarretWilson提供的指针和正则表达式.info提供的Unicode指南。

需要注意的是，Normalizer本身不足以删除变音符。例如，下面的代码不会将重音的é替换为不重音的e:

import static java.text.Normalizer.normalize;
import static java.text.Normalizer.Form.*;

public class T {
  public static void main( final String[] args ) {
    final var text = "Brévis";

    System.out.println(
      normalize( text, NFD ) + " " + 
      normalize( text, NFC ) + " " + 
      normalize( text, NFKD ) + " " + 
      normalize( text, NFKC )
    );
  }
}

@David Conrad solution is the fastest I tried using the Normalizer, but it does have a bug. It basically strips characters which are not accents, for example Chinese characters and other letters like æ, are all stripped. The characters that we want to strip are non spacing marks, characters which don't take up extra width in the final string. These zero width characters basically end up combined in some other character. If you can see them isolated as a character, for example like this `, my guess is that it's combined with the space character.

public static String flattenToAscii(String string) {
    char[] out = new char[string.length()];
    String norm = Normalizer.normalize(string, Normalizer.Form.NFD);

    int j = 0;
    for (int i = 0, n = norm.length(); i < n; ++i) {
        char c = norm.charAt(i);
        int type = Character.getType(c);

        //Log.d(TAG,""+c);
        //by Ricardo, modified the character check for accents, ref: http://stackoverflow.com/a/5697575/689223
        if (type != Character.NON_SPACING_MARK){
            out[j] = c;
            j++;
        }
    }
    //Log.d(TAG,"normalized string:"+norm+"/"+new String(out));
    return new String(out);
}

如果有人在kotlin中很难做到这一点，这段代码就像一个魅力。为了避免不一致，我也使用. touppercase和Trim()。然后我强制转换这个函数:

   fun stripAccents(s: String):String{

   if (s == null) {
      return "";
   }

val chars: CharArray = s.toCharArray()

var sb = StringBuilder(s)
var cont: Int = 0

while (chars.size > cont) {
    var c: kotlin.Char
    c = chars[cont]
    var c2:String = c.toString()
   //these are my needs, in case you need to convert other accents just Add new entries aqui
    c2 = c2.replace("Ã", "A")
    c2 = c2.replace("Õ", "O")
    c2 = c2.replace("Ç", "C")
    c2 = c2.replace("Á", "A")
    c2 = c2.replace("Ó", "O")
    c2 = c2.replace("Ê", "E")
    c2 = c2.replace("É", "E")
    c2 = c2.replace("Ú", "U")

    c = c2.single()
    sb.setCharAt(cont, c)
    cont++

}

return sb.toString()

}

要像这样使用这些有趣的转换代码:

     var str: String
     str = editText.text.toString() //get the text from EditText
     str = str.toUpperCase().trim()

     str = stripAccents(str) //call the function

面对同样的问题，这里是使用Kotlin扩展的解决方案

   val String.stripAccents: String
    get() = Regex("\\p{InCombiningDiacriticalMarks}+")
        .replace(
            Normalizer.normalize(this, Normalizer.Form.NFD),
            ""
        )

使用

val textWithoutAccents = "some accented string".stripAccents

从2011年开始，你可以使用Apache Commons stringutils . stripaccent (input)(从3.0开始):

    String input = StringUtils.stripAccents("Tĥïŝ ĩš â fůňķŷ Šťŕĭńġ");
    System.out.println(input);
    // Prints "This is a funky String"

注意:

接受的答案(Erick Robertson的)对于Ø或Ł不适用。Apache Commons 3.5也不能用于Ø，但它可以用于Ł。在阅读了维基百科上关于Ø的文章后，我不确定它是否应该被“O”取代:它在挪威语和丹麦语中是一个单独的字母，在“z”之后按字母顺序排列。这是“条形强调”方法局限性的一个很好的例子。