Create the data string for the Google Authenticator QR Code

getGoogleAuthenticatorBarCode.java

public static String getGoogleAuthenticatorBarCode(String secretKey, String account, String issuer) {
    String normalizedBase32Key = secretKey.replace(" ", "").toUpperCase();
    try {
        return "otpauth://totp/"
        + URLEncoder.encode(issuer + ":" + account, "UTF-8").replace("+", "%20")
        + "?secret=" + URLEncoder.encode(normalizedBase32Key, "UTF-8").replace("+", "%20")
        + "&issuer=" + URLEncoder.encode(issuer, "UTF-8").replace("+", "%20");
    } catch (UnsupportedEncodingException e) {
        throw new IllegalStateException(e);
    }
}