Trying to update a "Loading" label... "while you wait for a thread

Hello, I am new to Java and BlackBerry, so it is a double learning curve for me. I tried searching for an answer and we have tried a number of things, but I do always get the label that I update to display. Any help would be greatly appreciated. I have a main screen with a label field. I start a thread, and that this thread works I loop and try to update the label as in the httpdemo example. I do this in refreshMenuItem. The code looks like she change the label, but the screen does not appear to refresh and show the update label. Any advice? Thank you.

public class testLoadingMainScreen extends MainScreen
{

   private boolean isLoading;
   private LabelField statuslabel;

   public testLoadingMainScreen()
   {

      LabelField title = new LabelField("Loading Demo", LabelField.USE_ALL_WIDTH);
      setTitle(title);

      statuslabel = new LabelField("Waiting...", LabelField.USE_ALL_WIDTH);
      add(statuslabel);
   }

   Public void requestSucceeded(final String message)
   {
      isLoading = false;
      updateContent(message);
   }

   public void requestFailed(final String message)
   {
      isLoading = false;
      updateContent(message);
   }

   private MenuItem _refreshMenuItem = new MenuItem("Refresh List" , 10, 10)
   {
      public void run() {

         //setup the status messages.
         String[] statusMsg = new String[6];
         StringBuffer status = new StringBuffer("Loading");
         statusMsg[0] = status.toString();
         for ( int j = 1; j < 6; ++j)
         {
            statusMsg[j] = status.append(" .").toString();
         }

         updateContent("Starting...");

         isLoading = true;

         //start the thread
         try
         {
              testLoadingThread dispatcher = new testLoadingThread(testLoadingMainScreen.this);
              dispatcher.start();
         }
         catch (Exception e)
         {
              System.out.println(e.toString());
         }

         //while thread is working, update status message
         int i = 0;
         while ( isLoading )
         {
            updateContent(statusMsg[++i%6]);
            try
            {
               Thread.sleep(500); // Wait for a bit.
            }
            catch (InterruptedException e)
            {
               System.err.println(e.toString());
            }
         }

      }
   };

   protected void makeMenu(Menu menu, int instance)
   {
      menu.add(_refreshMenuItem);
      menu.addSeparator();
      super.makeMenu(menu, instance);
   }

   private void updateContent(final String text)
   { 

      //synchronized(UiApplication.getEventLock()) {
      //    testLoadingMainScreen.this.statuslabel.setText(text);
      //    testLoadingMainScreen.this.invalidate();
      //}

      UiApplication.getUiApplication().invokeLater (new Runnable() {
         public void run()
         {
            testLoadingMainScreen.this.statuslabel.setText(text);
            testLoadingMainScreen.this.invalidate();
         }
      });
   }

}//end testUImainscreen class

public class testLoadingThread extends Thread {

    testLoadingMainScreen screen;

    public testLoadingThread(testLoadingMainScreen screen) {
        this.screen = screen;
        }

    public void run() {

        //put thread to sleep so I can test informative labels
        try {
            Thread.sleep(5000);
        } catch (Exception e) {
            screen.requestFailed(e.toString());
        }

        screen.requestSucceeded("Sucess");

    }//end run

}//end testLoadingThread class

MenuItems run in the UI thread... don't sleep() in them. I guess that's causing your problem of update to block the UI thread. Use rather a reason for recall with a background thread making sleep if you need regular notifications to the user interface.

~ NN

Edit: On coffee/reflection, recall patterns may be overkill here... you can simply use a Timer/TimerTask.

Tags: BlackBerry Developers

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