Java Development

[TaShea]

Running on JDE 4.2.1 for the T-Mobile 8800 OS 4.2.1.103

The program is trying to return the GPS coordinates.  It's a small application that I will add on to later, any help or suggestions would be helpfull.

Below is snippet of the code. The code is called from a menu selection.

   // Get GPS using Autonomous
     public void sGPS(){
        
         try{            
                   Criteria ct = new Criteria();
                   eType.setText("Autonomous"); 
                  ct.setHorizontalAccuracy(50);
                  ct.setVerticalAccuracy(50);
                  ct.setCostAllowed(true);
                  ct.setPreferredPowerConsumption(Criteria.POWER_USAGE_MEDIUM);
             ct.setPreferredResponseTime(10000);
             LocationProvider lProvider = LocationProvider.getInstance(ct);
            
             Location loc = lProvider.getLocation(-1); // Error occurs here
           
            eCordsLat.setText(String.valueOf(loc.getQualifiedCoordinates().getLatitude()));           
            eCordsLong.setText(String.valueOf(loc.getQualifiedCoordinates().getLongitude()));           
            eStatus.setText("Complete");
           
           
           
            }catch(Exception e){
                System.out.println("Error Msg on geting GPS info : " + e);
                }                                   
       }

[mreed]

What is the exact error? Does it complain about not having the event lock?

If so, you'll see that error when you try to update the UI when running on a seperate thread.

I think the actual error may be the next line after getLocation(), when you call setText()...I'm guessing on a label?

See: http://supportforums.blackberry.com/rim/board/message?board.id=java_dev&view=by_date_ascending&messa...

Message Edited by mreed on 07-16-2008 03:55 PM

[TaShea]

The exact error is getLocation() method cannot be called from event thread. 

[bzubert]

In this case, you need to make sure that you are not blocking the event thread.  That is, the event thread handles all drawing operations, and getLocation() is a blocking operation.  Calls to getLocation() should be moved to a separate thread or alternatively, you should could use a LocationListener, which manages the threading for you.

Please see the following KB article for more information.

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800451/800783/What_Is...

[mreed]

Okay. Then you need to get that call off the UI thread. You can use the Timer class to schedule a TimerTask to run in the background. Wrap the UI update portions in an invokeLater() so they will be called on the UI thread.

Message Edited by mreed on 07-16-2008 04:08 PM

[TaShea]

I tried that and for some odd reason, The simulator returns zeros for Lat and Long.. I have values set in the Simulator[8800 T-Mobile] for GPS, but they still come back as Zero. I do get a time stamp, but no Longitude or Latitude..  When you run the simulator with values set for the GPS, you should at least get those returned, right?  Or am I missing something?

[MSohm]

The BlackBerry simulator should return the values for the currently selected location that is configured by clicking on the Simulate menu, then GPS Location... and then selecting a location.

Have you selected a location?  Or are you simulating a route?

[avinash_kumar_ispg_in]

Hi  every one

any body got the solution of this problem  if it is please reply me

thanks in advance

[simon_hain]

please open an own thread for your question, you can link to this one