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);                hexString.append(":");            }            String result = hexString.toString();            return result.substring(0, result.length() - 1);        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }        return null;    }