code: public static String getUserAgent() {
          if (userAgent == null) {
              String userAgentComment = String.format(Utility.LOCALE_US, "(Android %s; %s; %s)",
                      android.os.Build.VERSION.RELEASE, android.os.Build.BRAND, android.os.Build.MODEL);
              userAgent = String.format("%s/%s %s", Constants.HeaderConstants.USER_AGENT_PREFIX,
                      Constants.HeaderConstants.USER_AGENT_VERSION, userAgentComment);
          }
  
          return userAgent;
      }
docs: Gets the user agent to send over the wire to identify the client.
  
  @return the user agent to send over the wire to identify the client.