well frnds my code for maps works well and shows all pics and gradient paths very well on the simulator after simulating the gps ,but it does not works on the device....

The gps on device is working properly as google maps and other work related to gps are working perfectly fine

my code

         if(GPS_Location.lati!=0.0 && GPS_Location.longi!=0.0)
            {                       
                User_latitude = ((GPS_Location.lati)*100000);
                User_longitude = ((GPS_Location.longi)*100000);

                User_La = String.valueOf(User_latitude).substring(0, String.valueOf(User_latitude).lastIndexOf('.'));
                User_Lo = String.valueOf(User_longitude).substring(0, String.valueOf(User_longitude).lastIndexOf('.'));

             if(param.equals("")) //for find business near me
             {

                 document1 = "<location-document>" +
                                "<location lon='"+User_Lo+"' lat='"+User_La+"' label='User' />"+
                                "<location lon='"+User_Lo+"' lat='"+User_La+"' label='"+"User"+"' />"+
                             "</location-document>";
             }
             if(!param.equals("")) //for the directions
             {
                 Business_latitude = Double.parseDouble(param.substring(0, param.lastIndexOf(',')));
                 Business_longitude = Double.parseDouble(param.substring(param.lastIndexOf(',')+1,param.length())); 

                 Business_latitude = Business_latitude*100000;                   
                 Business_longitude = Business_longitude*100000;

                 Business_La = String.valueOf(Business_latitude).substring(0, String.valueOf(Business_latitude).lastIndexOf('.'));                  
                 Business_Lo = String.valueOf(Business_longitude).substring(0, String.valueOf(Business_longitude).lastIndexOf('.'));

                 document1 = "<location-document>" +
                                "<GetRoute>"+
                            "<location lon='"+User_Lo+"' lat='"+User_La+"' label='User' />"+
                            "<location lon='"+Business_Lo+"' lat='"+Business_La+"' label='"+"User"+"' />"+
                            "</GetRoute>"+
                        "</location-document>";
             }
              Invoke.invokeApplication(Invoke.APP_TYPE_MAPS,new MapsArguments(MapsArguments.ARG_LOCATION_DOCUMENT,document1));
         }

this code works on simulator but not fine on device. just points a pin indicating user and nothing else

what to do????