code: public boolean detectOperaMobile() {
  
          if ((userAgent.indexOf(engineOpera) != -1)
              && ((userAgent.indexOf(mini) != -1) || (userAgent.indexOf(mobi) != -1))) {
              return true;
          }
          return false;
      }
docs: Detects Opera Mobile or Opera Mini.
  @return detection of an Opera browser for a mobile device