Guard application launch at the start of the appliance, also need advice for the implementation of network methods

Hi all

I'm new to the development of Blackberry and I'm writing a relatively simple application to run on 7.1.

So far the development was interesting, I managed to create my user interface using resources online (mainly this forum), but today I tried to implement some of the network classes that I need and now I just met constant problems.

I use Eclipse SDK 3.7.2 (the one that comes with the plugin RIM)

First question:

I'm not sure what I changed, but today I noticed that whenever I start the Simulator (by sim 9360) my application is started during the initial startup process. I don't think he did this before, but to be honest, I wasn't paying much attention. I think it starts at the start of the device is because I put a breakpoint in the constructor for my class from the main screen, which is hit before the Simulator happens even to the point where it is ready for user interaction. In addition, once it is ready, if I press the BB button, I see my registered application.

I don't have it set to automatic start in .xml descriptior enforcement.

I started this application on the HelloBlackBerry sample, here is my main method for the entry of the application:

public static void main( String[] args ) {
        appSettings = AppSettings.fetch();
        // Create a new instance of the application and make the currently
        // running thread the application's event dispatch thread.
        HelloBlackBerry theApp = new HelloBlackBerry();
        theApp.enterEventDispatcher();
        //openConnection();

    }

As far as I know, this is the only entry point for the application.

More code

    public HelloBlackBerry() {
        // Push a screen onto the UI stack for rendering.
        mainScreen = new ScreenHelloBlackBerry();
        pushScreen( mainScreen );
    }

Here is the method of. my class AppSettings fetch()

    // Retrieves a copy of the effective properties set from storage.
    public static AppSettings fetch()
    {
        AppSettings savedSettings = (AppSettings) _store.getContents();
        return new AppSettings(savedSettings);
    }

Some of this code that I wrote myself, the persistence store cause the launch of my car?

I tried to reset the Simulator to the factory settings, no change.

All applications initialized during the startup of the device and then closed shortly after?

Part 2: Need advice for the implementation of functions of network in the application

I need to implement some methods that will retrieve data from a web service, and I also need to send data to this service. What I've read, the ConnectionFactory is the way to go. I want my application to make a request when the application is open and can check on a set interval. I didn't know exactly how to go about adding another thread for networking, I understand that network connections should not be created on the thread main event, so I tried to do this:

The constructor of my class that implements screen (ScreenHelloBlackBerry), I use the following to create a modal dialog box to prompt the user for a username, I also try networking wire in the same segment of spawning:

        public ScreenHelloBlackBerry(){...initialize fields and managers, add it all together...then near the end

//This will open the confirm dialog when the application is launched
        UiApplication.getUiApplication().invokeLater(new Runnable() {
              public void run() {
                  openConfirmDialog();
                //start connection - Possibly broken
                  ConnectionThread ct = new ConnectionThread();
                  ct.start();
              }
        });

I don't know if it's somehow OK to do, but it seems to work for what I need. I want a user who launches the application at the prompt, and if a user switch applications, when they come back they wondered again (unless they close the app and reopen it).

Here is my ConnectionThread:

public class ConnectionThread extends Thread
{

    public void run()
    {

          ConnectionFactory connFact = new ConnectionFactory();
          ConnectionDescriptor connDesc;
          connDesc = connFact.getConnection("http://www.google.com");
          if (connDesc != null)
          {
              HttpConnection httpConn;
              httpConn = (HttpConnection)connDesc.getConnection();
              try
              {
                  final int iResponseCode = httpConn.getResponseCode();
                  UiApplication.getUiApplication().invokeLater(new Runnable()
                  {
                      public void run()
                      {
                          Dialog.alert("Response code: " +
                                        Integer.toString(iResponseCode));

                      }
                   });
                  httpConn.close();

               }
               catch (IOException e)
               {
                 System.err.println("Caught IOException: "
                      + e.getMessage());
               }
          }
    }
}

At the moment it has basically unmodified code from a sample that I found, I'll be retooling to meet my needs whenever I can make it work. I HAD this work to the point where, after the closed user confirm this dialog, a few moments later a an alert dialog appears with the 302 response code. I don't know what changed, but now it doesn't work at all, and if I try to scroll with the debugger, I can't past the httpCon.getResponseCode (). I've seen some mistakes earlier on "no record of service was set up", and I also had once a timeout exception.

I'm sure I'm doing this wrong, but at the same time as I said WAS working, and now it is not. If someone has done this far, thank you very much for your time and advice are much appreciated.

Also, should I try to start the thread of the network of the UIApplication class instead of the screen? There is currently very little happening in the class that extends UIApplication, do I spend most of my business logic out of the class of the screen and in the UIApplication class?

Thanks in advance!

Hi all

Just to conclude this topic for those who are interested, I found an excellent guide to the implementation of networks in applications of BB, click here for a link.

About my application being started at the start of the simulator of the device, I found that on a device real this behavior is not complied with, and in addition, the behaviour seems to have stopped after uninstallation and reinstallation of my Simulator.

See you soon,.

Tags: BlackBerry Developers

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