public static String getSHA1(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;

    }