表情字符判断

Emoji.java

/**
	 * 判断一个字符是否emoji表情字符
	 * 
	 * @param ch
	 *            待检测的字符
	 */
	public static boolean isEmoji(char ch) {
		return !((ch == 0x0) || (ch == 0x9) || (ch == 0xA) || (ch == 0xD)
				|| ((ch >= 0x20) && (ch <= 0xD7FF))
				|| ((ch >= 0xE000) && (ch <= 0xFFFD)) || ((ch >= 0x10000) && (ch <= 0x10FFFF)));
	}

	/**
	 * 清除一个字符串中的emoji表情字符
	 */
	public static String cleanEmoji(String s) {
		if (isEmpty(s)) {
			return null;
		}
		StringBuilder builder = new StringBuilder(s);
		for (int i = 0; i < builder.length(); i++) {
			if (isEmoji(builder.charAt(i))) {
				builder.deleteCharAt(i);
				builder.insert(i, ' ');// 比字符串中直接替换字符要好，那样会产生很多字符串对象
			}
		}
		return builder.toString().trim();
	}