android 获取sha1值

//    public static String sha1(Context context) {
//        try {
//            PackageInfo info = context.getPackageManager().getPackageInfo(
//                    context.getPackageName(), PackageManager.GET_SIGNATURES);
//            byte[] cert = info.signatures[0].toByteArray();
//            MessageDigest md = MessageDigest.getInstance("SHA1");
//            byte[] publicKey = md.digest(cert);
//            StringBuffer hexString = new StringBuffer();
//            for (int i = 0; i < publicKey.length; i++) {
//                String appendString = Integer.toHexString(0xFF & publicKey[i])
//                        .toUpperCase(Locale.US);
//                if (appendString.length() == 1)
//                    hexString.append("0");
//                hexString.append(appendString);
//            }
//            return hexString.toString();
//        } catch (PackageManager.NameNotFoundException e) {
//            e.printStackTrace();
//        } catch (NoSuchAlgorithmException e) {
//            e.printStackTrace();
//        }
//        return null;
//    }