public void setTokenAuthExtras(final Intent intent) {
            if (intent != null) {
                intent.putExtra(Intents.EXTRA_TOKEN_AUTH_URL_TOKEN, urlToken);
                intent.putExtra(Intents.EXTRA_TOKEN_AUTH_USERNAME, fieldUsername);
                intent.putExtra(Intents.EXTRA_TOKEN_AUTH_PASSWORD, fieldPassword);
            }
        }
Enable or disable the start button depending on login/password field.
If both fields are not empty, button is enabled.
main/src/main/java/cgeo/geocaching/activity/TokenAuthorizationActivity.java