Android Question Call a b4a function from java jar library

private String callhostsub(BA processBA, String sub, Object[] args)
{
        try
        {
            sub = sub.toLowerCase();
            if (args == null)
                args = new String[0];
            if (!BA.subExists(sub))
            {
                BA.Log("B4A", "CallHostSub :  Sub " + sub + " not found!");
                return "";
            }
            String ret;  
            // use raiseEvent2 to let it run during Activity_Create
            ret = (String) BA.raiseEvent2(this, true, sub, false, args);
            // raiseEvent returns null during Activity_Create
            if (ret == null)
            {
        ret = "";
            }
      return ret;
        } catch (Exception e)
        {
            String msg = "CallHostSub : " + sub + " - " + e.toString() + " - " + e.getMessage();
            BA.Log( msg);
        }
        return "";
    }