android md5加密

public String md5(String s) {   
    try {   
        // Create MD5 Hash   
        MessageDigest digest = java.security.MessageDigest.getInstance("MD5");   
        digest.update(s.getBytes());   
        byte messageDigest[] = digest.digest();   
  
        // Create Hex String   
        StringBuffer hexString = new StringBuffer();   
        for (int i=0; i<messageDigest.length; i++)   
            hexString.append(Integer.toHexString(0xFF & messageDigest[i]));   
        return hexString.toString();   
  
    } catch (NoSuchAlgorithmException e) {   
        e.printStackTrace();   
    }   
    return "";   
}   

 貌似android已经封装好了md5的加密算法，这里只是一个调用的函数