在我们Android开发的项目中，难免有要求在输入框中禁止输入表情，所以呢，写了一个输入框禁止输入表情的demo，供大伙参考
效果图
如图显示，如果用户输入了表情字符，会提示。
EmojiFilter(表情过滤器)
public class EmojiFilter {
/** 匹配非表情符号的正则表达式 */
public static final String reg = "^([a-z]|[A-Z]|[0-9]|[\u2E80-\u9FFF]){3,}|@(?:[\\w](?:[\\w-]*[\\w])?\\.)+[\\w](?:[\\w-]*[\\w])?|[wap.]{4}|[www.]{4}|[blog.]{5}|[bbs.]{4}|[.com]{4}|[.cn]{3}|[.net]{4}|[.org]{4}|[http://]{7}|[ftp://]{6}$";
public static final Pattern pattern = Pattern.compile(reg);
/**
* 检测是否有emoji字符
*
* @param source
* @return FALSE，包含图片
*/
public static boolean containsEmoji(String source) {
if (source.equals("")) {
return false;
}
int len = source.length();
for (int i = 0; i < len; i++) {
char codePoint = source.charAt(i);
if (isEmojiCharacter(codePoint)) {
// do nothing，判断到了这里表明，确认有表情字符
return true;
}
}
return false;
}
private static boolean isEmojiCharacter(char codePoint) {
return (codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA)
|| (codePoint == 0xD)
|| ((codePoint >= 0x20) && (codePoint <= 0xD7FF))
|| ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))
|| ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));
}
/**
* 过滤emoji 或者 其他非文字类型的字符
*
* @param source
* @return
*/
public static String filterEmoji(String source) {
if (!containsEmoji(source)) {
return source;// 如果不包含，直接返回
}
// 到这里铁定包含
StringBuilder buf = null;
int len = source.length();
for (int i = 0; i < len; i++) {
char codePoint = source.charAt(i);
if (isEmojiCharacter(codePoint)) {
if (buf == null) {
buf = new StringBuilder(source.length());
}
buf.append(codePoint);
} else {
}
}
if (buf == null) {
return source;// 如果没有找到 emoji表情，则返回源字符串
} else {
if (buf.length() == len) {// 这里的意义在于尽可能少的toString，因为会重新生成字符串
buf = null;
return source;
} else {
return buf.toString();
}
}
}
}
demo下载地址：
http://download.csdn.net/download/xinanheishao/9870832