Java String Unicode converter

NotifyUtils.java

    public static String unicodeConvert(String str) {
        StringBuilder sb = new StringBuilder();
        char ch;
        int len = str.length();
        for (int i = 0; i < len; i++) {
            ch = str.charAt(i);
            if (ch == '\\' && str.charAt(i + 1) == 'u') {
                sb.append((char) Integer.parseInt(str.substring(i + 2, i + 6), 16));
                i += 5;
                continue;
            }
            sb.append(ch);
        }
        return sb.toString();
    }