Android--MD5加密

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public static String getMD5(String str) {        MessageDigest md5 = null;        try {            md5 = MessageDigest.getInstance("MD5");        } catch (Exception e) {            e.printStackTrace();            return "";        }        char[] charArray = str.toCharArray();        byte[] byteArray = new byte[charArray.length];        for (int i = 0; i < charArray.length; i++) {            byteArray[i] = (byte) charArray[i];        }        byte[] md5Bytes = md5.digest(byteArray);        StringBuffer hexValue = new StringBuffer();        for (int i = 0; i < md5Bytes.length; i++) {            int val = ((int) md5Bytes[i]) & 0xff;            if (val < 16) {                hexValue.append("0");            }            hexValue.append(Integer.toHexString(val));        }        return hexValue.toString();    }