Android获取签名MD5

    public void printSignatureMD5() {
        try {
            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);

            Log.e("getMD5MessageDigest", getMD5MessageDigest(packageInfo.signatures[0].toByteArray()));

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getMD5MessageDigest(byte[] bytes) {
        StringBuffer md5StringBuffer = new StringBuffer();
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(bytes);
            byte[] digest = messageDigest.digest();
            for (int i = 0; i < digest.length; i++) {
                String hexString = Integer.toHexString(digest[i] & 0xff);

                if (hexString.length() == 1)
                    md5StringBuffer.append("0");

                md5StringBuffer.append(hexString);
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return md5StringBuffer.toString();
    }