Strange problem with HorizontalFieldManager - it does not show on real device bitmap

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  1. what operating system is installed on the computer?
  2. were there any changes (hardware or software) to the computer before the show?
  
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  public class GPSDemoScreen extends MainScreen implements FieldChangeListener{
      private ButtonField btnGPSTest;
      private EditField edStatus;    
  
      private BBTest bbTest = null;
      private VerticalFieldManager vfManager = null;
  
        // Constants -----------------------------------------------------------------------------------------------------------------
      private static final int GRADE_INTERVAL=5;  // Seconds - represents the number of updates over which alt is calculated.
   //   private static final long ID = 0x5d459971bb15ae7aL; //com.rim.samples.device.gpsdemo.GPSDemo.ID
      private static final int CAPTURE_INTERVAL=5;    // We record a location every 5 seconds.
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      // When running this application, select options from the menu and replace 
      // with the name of the computer which is running the GPSServer application found in
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      // can be hard-coded below with no need to further modify the server name while running the application.
  
      private static int _interval = 1;   // Seconds - this is the period of position query.
      private static float[] _altitudes;
      private static float[] _horizontalDistances;
  
       private long _startTime;
      private float _wayHorizontalDistance;
      private float _horizontalDistance;
      private float _verticalDistance;
      private StringBuffer _messageString;
      private LocationProvider _locationProvider;
      //private ServerConnectThread _serverConnectThread;   
  
      /** Creates a new instance of GPSDemoScreen */
      public GPSDemoScreen(BBTest bbtest) {
          super(DEFAULT_MENU | DEFAULT_CLOSE);
          bbTest = bbtest;
  
          initComponent();
      }
  
      private void initComponent(){
          this.setTitle("GPS Demo");
       //   this.bbTest.setBGImage(vfManager, this);
          // Used by waypoints, represents the time since the last waypoint.
          _startTime = System.currentTimeMillis();
          _altitudes = new float[GRADE_INTERVAL];
          _horizontalDistances = new float[GRADE_INTERVAL];
          _messageString = new StringBuffer();
  
          btnGPSTest = new ButtonField("GPS Test", ButtonField.CONSUME_CLICK);
          btnGPSTest.setChangeListener(this);
          edStatus = new EditField( Field.NON_FOCUSABLE);
          edStatus.setText("retriving Longitude and Latitude.Please wait..");
          this.add(btnGPSTest);
          this.add(edStatus);
  
      }
  
       /**
       * Rounds off a given double to the provided number of decimal places.
       * @param d The double to round off.
       * @param decimal The number of decimal places to retain.
       * @return A double with the number of decimal places specified.
       */
      private static double round(double d, int decimal)
      {
          double powerOfTen = 1;
  
          while (decimal-- > 0)
          {
              powerOfTen *= 10.0;
          }
  
          double d1 = d * powerOfTen;
          int d1asint = (int)d1; // Clip the decimal portion away and cache the cast, this is a costly transformation.
          double d2 = d1 - d1asint; // Get the remainder of the double.
  
          // Is the remainder > 0.5? if so, round up, otherwise round down (lump in .5 with > case for simplicity).
          return ( d2 >= 0.5 ? (d1asint + 1)/powerOfTen : (d1asint)/powerOfTen);
      }
  
       /**
       * Invokes the Location API with the default criteria.
       *
       * @return True if the Location Provider was successfully started; false otherwise.
       */
      private boolean startLocationUpdate()
      {
          boolean retval = false;
  
          try
          {
              _locationProvider = LocationProvider.getInstance(null);
  
              if ( _locationProvider == null )
              {
                  // We would like to display a dialog box indicating that GPS isn't supported,
                  // but because the event-dispatcher thread hasn't been started yet, modal
                  // screens cannot be pushed onto the display stack.  So delay this operation
                  // until the event-dispatcher thread is running by asking it to invoke the
                  // following Runnable object as soon as it can.
                  Runnable showGpsUnsupportedDialog = new Runnable()
                  {
                      public void run() {
                          Dialog.alert("GPS is not supported on this platform, exiting...");
                          System.exit( 1 );
                      }
                  };
  
                  UiApplication.getApplication().invokeLater( showGpsUnsupportedDialog );  // Ask event-dispatcher thread to display dialog ASAP.
              }
              else
              {
                  // Only a single listener can be associated with a provider, and unsetting it
                  // involves the same call but with null, therefore, no need to cache the listener
                  // instance request an update every second.
                  _locationProvider.setLocationListener(new LocationListenerImpl(), _interval, 1, 1);
                  retval = true;
              }
          }
          catch (LocationException le)
          {
              System.err.println("Failed to instantiate the LocationProvider object, exiting...");
              System.err.println(le);
              System.exit(0);
          }
          return retval;
      }
        /**
       * Update the GUI with the data just received.
       */
      private void updateLocationScreen(final String msg)
      {
          UiApplication.getApplication().invokeLater(new Runnable()
          {
              public void run()
              {
                  System.out.println(msg.toString());
                  edStatus.setText(msg);
                  Dialog.alert(msg.toString());
              }
          });
      }
  
    public void fieldChanged(Field field, int context){
           if(field.equals(btnGPSTest)){
              startLocationUpdate();
           }
  
       }
      /** Standard Escape-key handler */
      public boolean keyChar(char key, int status, int time) {
          boolean retval = false;
          switch (key) {
              case Characters.ESCAPE:
                 // UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());
                  break;
              default:
                  retval = super.keyChar(key, status, time);
          }
          return retval;
      }
  
       /**
       * Implementation of the LocationListener interface.
       */
      private class LocationListenerImpl implements LocationListener
      {
          // Members ----------------------------------------------------------------------------------------------
          private int captureCount;
          private int sendCount;
  
          // Methods ----------------------------------------------------------------------------------------------
          /**
           * @see javax.microedition.location.LocationListener#locationUpdated(LocationProvider,Location)
           */
          public void locationUpdated(LocationProvider provider, Location location)
          {
              try{
                  if(location.isValid())
                  {
                      float heading = location.getCourse();
                      double longitude = location.getQualifiedCoordinates().getLongitude();
                      double latitude = location.getQualifiedCoordinates().getLatitude();
                      float altitude = location.getQualifiedCoordinates().getAltitude();
                      float speed = location.getSpeed();                
  
                      // Horizontal distance to send to server.
                      float horizontalDistance = speed * _interval;
                      _horizontalDistance += horizontalDistance;
  
                      // Horizontal distance for this waypoint.
                      _wayHorizontalDistance += horizontalDistance;
  
                      // Distance over the current interval.
                      float totalDist = 0; 
  
                      // Moving average grade.
                      for(int i = 0; i < GRADE_INTERVAL - 1; ++i)
                      {
                          _altitudes[i] = _altitudes[i+1];
                          _horizontalDistances[i] = _horizontalDistances[i+1];
                          totalDist = totalDist + _horizontalDistances[i];
                      }
  
                      _altitudes[GRADE_INTERVAL-1] = altitude;
                      _horizontalDistances[GRADE_INTERVAL-1] = speed*_interval;
                      totalDist= totalDist + _horizontalDistances[GRADE_INTERVAL-1];
                      float grade = (totalDist==0.0F)? Float.NaN : ( (_altitudes[4] - _altitudes[0]) * 100/totalDist);
  
                      // Running total of the vertical distance gain.
                      float altGain = _altitudes[GRADE_INTERVAL-1] - _altitudes[GRADE_INTERVAL-2];
  
                      if (altGain > 0)
                      {
                          _verticalDistance = _verticalDistance + altGain;
                      }
  
                      captureCount += _interval;
  
                      // If we're mod zero then it's time to record this data.
                      captureCount %= CAPTURE_INTERVAL;
  
                      // Information to be sent to the server.
                      if ( captureCount == 0 )
                      {
                          // Minimize garbage creation by appending only character primitives, no extra String objects created that way.
                          _messageString.append(round(longitude,4));
                          _messageString.append(';');
                          _messageString.append(round(latitude,4));
                          _messageString.append(';');
                          _messageString.append(round(altitude,2));
                          _messageString.append(';');
                          _messageString.append(_horizontalDistance);
                          _messageString.append(';');
                          _messageString.append(round(speed,2));
                          _messageString.append(';');
                          _messageString.append(System.currentTimeMillis());
                          _messageString.append(':');
                          sendCount += CAPTURE_INTERVAL;
                          _horizontalDistance = 0;
                      }
  
                      // If we're mod zero then it's time to send.
                      sendCount %= SENDING_INTERVAL;
  
                      synchronized(this)
                      {
                          if (sendCount == 0 && _messageString.length() != 0)
                          {
                          //  _serverConnectThread.sendUpdate(_messageString.toString());
                              _messageString.setLength(0);
                          }
                      }
  
                      // Information to be displayed on the device.
                      StringBuffer sb = new StringBuffer();
                      sb.append("Longitude: ");
                      sb.append(longitude);
                      sb.append("\n");
                      sb.append("Latitude: ");
                      sb.append(latitude);
                      sb.append("\n");
                      sb.append("Altitude: ");
                      sb.append(altitude);
                      sb.append(" m");
                      sb.append("\n");
                      sb.append("Heading relative to true north: ");
                      sb.append(heading);
                      sb.append("\n");
                      sb.append("Speed : ");
                      sb.append(speed);
                      sb.append(" m/s");
                      sb.append("\n");
                      sb.append("Grade : ");
                      if(Float.isNaN(grade))sb.append(" Not available");
                      else sb.append(grade+" %");
                      GPSDemoScreen.this.updateLocationScreen(sb.toString());
                  }
              }catch(Exception ex){
                  System.out.println(ex.toString());
                  ex.printStackTrace();
              }
          }
  
          public void providerStateChanged(LocationProvider provider, int newState)
          {
              // Not implemented.
          }
      }
  }
  

  It works fine now, when I tried door.

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