Eliminar los acentos de String

java.text.Normalizer existe en Android (en las últimas versiones de todos modos). Puedes usarlo.

EDIT Para referencia, aquí es cómo utilizar Normalizer :

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

(Pegado del acoplamiento en comentarios abajo)

He adaptado la solución de Rabi a mis necesidades, espero que ayude a alguien:

 private static Map<Character, Character> MAP_NORM; public static String removeAccents(String value) { if (MAP_NORM == null || MAP_NORM.size() == 0) { MAP_NORM = new HashMap<Character, Character>(); MAP_NORM.put('À', 'A'); MAP_NORM.put('Á', 'A'); MAP_NORM.put('Â', 'A'); MAP_NORM.put('Ã', 'A'); MAP_NORM.put('Ä', 'A'); MAP_NORM.put('È', 'E'); MAP_NORM.put('É', 'E'); MAP_NORM.put('Ê', 'E'); MAP_NORM.put('Ë', 'E'); MAP_NORM.put('Í', 'I'); MAP_NORM.put('Ì', 'I'); MAP_NORM.put('Î', 'I'); MAP_NORM.put('Ï', 'I'); MAP_NORM.put('Ù', 'U'); MAP_NORM.put('Ú', 'U'); MAP_NORM.put('Û', 'U'); MAP_NORM.put('Ü', 'U'); MAP_NORM.put('Ò', 'O'); MAP_NORM.put('Ó', 'O'); MAP_NORM.put('Ô', 'O'); MAP_NORM.put('Õ', 'O'); MAP_NORM.put('Ö', 'O'); MAP_NORM.put('Ñ', 'N'); MAP_NORM.put('Ç', 'C'); MAP_NORM.put('ª', 'A'); MAP_NORM.put('º', 'O'); MAP_NORM.put('§', 'S'); MAP_NORM.put('³', '3'); MAP_NORM.put('²', '2'); MAP_NORM.put('¹', '1'); MAP_NORM.put('à', 'a'); MAP_NORM.put('á', 'a'); MAP_NORM.put('â', 'a'); MAP_NORM.put('ã', 'a'); MAP_NORM.put('ä', 'a'); MAP_NORM.put('è', 'e'); MAP_NORM.put('é', 'e'); MAP_NORM.put('ê', 'e'); MAP_NORM.put('ë', 'e'); MAP_NORM.put('í', 'i'); MAP_NORM.put('ì', 'i'); MAP_NORM.put('î', 'i'); MAP_NORM.put('ï', 'i'); MAP_NORM.put('ù', 'u'); MAP_NORM.put('ú', 'u'); MAP_NORM.put('û', 'u'); MAP_NORM.put('ü', 'u'); MAP_NORM.put('ò', 'o'); MAP_NORM.put('ó', 'o'); MAP_NORM.put('ô', 'o'); MAP_NORM.put('õ', 'o'); MAP_NORM.put('ö', 'o'); MAP_NORM.put('ñ', 'n'); MAP_NORM.put('ç', 'c'); } if (value == null) { return ""; } StringBuilder sb = new StringBuilder(value); for(int i = 0; i < value.length(); i++) { Character c = MAP_NORM.get(sb.charAt(i)); if(c != null) { sb.setCharAt(i, c.charValue()); } } return sb.toString(); } 

Esta no es probablemente la solución más eficiente, pero hará el truco y funciona en todas las versiones de Android:

 private static Map<Character, Character> MAP_NORM; static { // Greek characters normalization MAP_NORM = new HashMap<Character, Character>(); MAP_NORM.put('ά', 'α'); MAP_NORM.put('έ', 'ε'); MAP_NORM.put('ί', 'ι'); MAP_NORM.put('ό', 'ο'); MAP_NORM.put('ύ', 'υ'); MAP_NORM.put('ή', 'η'); MAP_NORM.put('ς', 'σ'); MAP_NORM.put('ώ', 'ω'); MAP_NORM.put('Ά', 'α'); MAP_NORM.put('Έ', 'ε'); MAP_NORM.put('Ί', 'ι'); MAP_NORM.put('Ό', 'ο'); MAP_NORM.put('Ύ', 'υ'); MAP_NORM.put('Ή', 'η'); MAP_NORM.put('Ώ', 'ω'); } public static String removeAccents(String s) { if (s == null) { return null; } StringBuilder sb = new StringBuilder(s); for(int i = 0; i < s.length(); i++) { Character c = MAP_NORM.get(sb.charAt(i)); if(c != null) { sb.setCharAt(i, c.charValue()); } } return sb.toString(); } 

Mientras que la respuesta de Guillaume funciona, quita todos los caracteres no ASCII de la cadena. Si desea conservar estos intentar este código (donde string es la cadena para simplificar):

 // Convert input string to decomposed Unicode (NFD) so that the // diacritical marks used in many European scripts (such as the // "C WITH CIRCUMFLEX" → ĉ) become separate characters. // Also use compatibility decomposition (K) so that characters, // that have the exact same meaning as one or more other // characters (such as "㎏" → "kg" or "ﾋ" → "ヒ"), match when // comparing them. string = Normalizer.normalize(string, Normalizer.Form.NFKD); StringBuilder result = new StringBuilder(); int offset = 0, strLen = string.length(); while(offset < strLen) { int character = string.codePointAt(offset); offset += Character.charCount(character); // Only process characters that are not combining Unicode // characters. This way all the decomposed diacritical marks // (and some other not-that-important modifiers), that were // part of the original string or produced by the NFKD // normalizer above, disappear. switch(Character.getType(character)) { case Character.NON_SPACING_MARK: case Character.COMBINING_SPACING_MARK: // Some combining character found break; default: result.appendCodePoint(Character.toLowerCase(character)); } } // Since we stripped all combining Unicode characters in the // previous while-loop there should be no combining character // remaining in the string and the composed and decomposed // versions of the string should be equivalent. This also means // we do not need to convert the string back to composed Unicode // before returning it. return result.toString(); 

Todos los chartacters acentuados están en el conjunto de códigos de caracteres ASCII extendido, con valores decimales mayores que 127. Para poder enumerar todos los caracteres de una cadena y si el valor del código de carácter decimal es mayor que 127, vuelva a asignarlo al equivalente deseado. No hay una manera fácil de asignar caracteres acentuados de nuevo a las contrapartes no acentuadas – tendría que mantener algún tipo de mapa en la memoria para asignar los códigos decimales extendidos de nuevo a los caracteres sin acento.