GPS apps in the background

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  Here are the steps that I use to configure a widget to auto-run using VS 2008.  It seems to work with simulators as well as when the widget is deployed through BES 5.0.   Please try it and let me know if it works for you.

  1. Create a new BlackBerry Widget project in VS 2008.  Name it "AutoRunWidget".
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  3. Use windows Explorer to navigate to the project folder and the forest down to the bin\OTAInstall folder.
  4. Find the AutoRunWidget.jad file in the OTAInstall folder.
  5. Right-click on the AutoRunWidget.jad file and select the copy"" command.
  6. Navigate to the top of two levels in the main project folder (one of the contains index.htm and config.xml).
  7. Paste the AutoRunWidget.jad file in the main project folder.
  8. In VS 2008 solution Explorer, click the button "show all files".  You should now see the file AutoRunWidget.jad previously the file config.xml and index.htm in the list (Fig 1).
  9. Make a right click on the AutoRunWidget.jad element and the select "include in project" menu command (Fig 2).
  10. In the Properties window, change the "Build Action" attribute for the file AutoRunWidget.jad ' Compile ' (Fig 3).
  11. Double-click the AutoRunWidget.jad file to display it in the editor VS 2008.
  12. In the content of the AutoRunWidget.jad file, change the line that reads "RIM-MIDlet-flags-1: 0" to "RIM-MIDlet-flags-1: 1"(Fig. 4). "»
  13. Save and close the AutoRunWidget.jad file.
  14. Clean the solution with the Build-> command clean the Solution.
  15. Rebuild the solution with the Build-> order regenerate the Solution.

  That's all!   Please note that whenever you modify the config.xml file, you will need to repeat steps 4 to 15 so that these changes are reflected in the .jad file.

  Coming up:

  -How to set up a widget to auto-run using Eclipse.

  -How to deploy a widget on the homescreen device instead of the folder "downloads".

  Fig 1.

  

  Fig 2.

  

  Fig. 3.

  

  Fig 4.

  

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  Hello Wadi,

  This has proved to be a bit of a monster post. If you have any questions at a stage any post, do not hesitate to ask. Let's dive.

  There are a few issues I see with the code you provided.

  PopupExtension.java

  
  

  • Creates an AlertNamespace object, your class is called PopupNamespace.

  PopupNamespace.java

  
  

  • getField is not implemented. \

  PopupFunction.java

  
  

  • A lot of import declarations are missing.

  I'll show you a comparison of my files, I managed to get the dialog box displayed from in my WebWorks app; No matter whether the application is in the foreground or background.

  For reference, the creation of my java files is based on the examples of code available here:

  https://bdsc.webapps.BlackBerry.com/HTML5/documentation/ww_developing/using_javascript_extensions_18...

  For starters, I have SandboxExtension.java. It is the equivalent of your PopupExtension.java.

  package sandbox.extension; 
  
  import net.rim.device.api.browser.field2.BrowserField;
  import net.rim.device.api.script.ScriptEngine;
  import net.rim.device.api.web.WidgetConfig;
  import net.rim.device.api.web.WidgetExtension;
  import org.w3c.dom.Document;
  
  public final class SandboxExtension implements WidgetExtension {
      String _widgetNameForFutureUse;
      BrowserField _browserFieldForFutureUse;
  
      public String[] getFeatureList() {
          String[] result = new String[1];
          result[0] = "sandbox.popup";
          return result;
      }
  
      public void loadFeature(String feature, String version, Document doc, ScriptEngine scriptEngine) throws Exception {
          if (feature.equals("sandbox.popup")) {
              scriptEngine.addExtension("sandbox.popup", new SandboxScriptable());
          }
      }
  
      public void register(WidgetConfig widgetConfig, BrowserField browserField) {
          _widgetNameForFutureUse = widgetConfig.getName();
          _browserFieldForFutureUse = browserField;
      }
  
      public void unloadFeatures(Document doc) {
      }
  }
  

  Main differences

  
  

  • I've updated my package to sandbox.extension it is unique (less chance that it has already been used.)
  • In getFeatureList, I and by using the function sandbox.popup; It was purely a personal choice I made during the implementation of the example. There is no real functional difference.
  • Subsequently to the first point, I also refer to sandbox.popup in my remaining code; more precisely within loadFeature.
  • My method of register sets two corresponding member variables.
  • I create a new SandboxScriptable object as opposed to your object of AlertNameSpace.

  The following file is SandboxScriptable.java. It is the equivalent of your PopupNamespace.java file. Note that this class must refer to the object that is created in the file above. In my case, I created an object of SandboxScriptable , so I'm now implement SandboxScriptable.java to define this object.

  package sandbox.extension;
  
  import net.rim.device.api.script.Scriptable;
  
  public final class SandboxScriptable extends Scriptable {
  
      private SandboxPopup _sandbox;
  
      public SandboxScriptable() {
          _sandbox = new SandboxPopup();
      }
  
      public Object getField(String name) throws Exception {
          if(name.equals("doPopup")) {
              return this._sandbox;
          }
          return super.getField(name);
      }
  }
  

  Main differences

  
  

  • Slight changes to naming to accommodate my variable names.
  • The getField function is (and must) be implemented. In fact, when a method is called, I check to see if it is the doPopup method. If so, I returns a SandboxPopup object. This would be your PopupFunction class. If the user does not call the doPopup method, I just pass back the default behavior via the super object.

  The final class is SandboxPopup.java. It is the equivalent of your PopupFunction.java. Above, we create and return an object of SandboxPopup , so in this file that we actually apply this that the object is actually.

  package sandbox.extension;
  
  import net.rim.device.api.script.ScriptableFunction;
  import net.rim.device.api.system.Application;
  import net.rim.device.api.ui.UiEngine;
  import net.rim.device.api.ui.Ui;
  import net.rim.device.api.ui.Screen;
  import net.rim.device.api.ui.component.Dialog;
  import net.rim.device.api.system.Bitmap;
  import net.rim.device.api.ui.Manager;
  
  public final class SandboxPopup extends ScriptableFunction {
      public Object invoke(Object obj, Object[] args) throws Exception {
          synchronized(Application.getEventLock()) {
              UiEngine ui = Ui.getUiEngine();
              Screen screen = new Dialog(Dialog.D_OK, "Hello World!", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.EXCLAMATION), Manager.VERTICAL_SCROLL);
              ui.pushGlobalScreen(screen, 1, UiEngine.GLOBAL_QUEUE);
          }
          return "UNDEFINED";
      }
  }
  

  Main differences

  • I added all declarations of import for the different Classes of the RIM used.
  • I return a default value 'Not DEFINED' string regardless of the success.

  And that is the essence of the java files. Basically, it is a string of three classes; the first refers to the second, and the second refers to the third. In your example, the chain is slightly broken, however can be fixed fairly quickly based on the notes above.

  The next part that needs to be done is to associate your Javascript Extension with WebWorks. This can be done in two different ways.

  • Package your extension with your application. Described in the Javascript Extension guide link above.
  • Integrate your extension with your SDK WebWorks.

  I opted for the latter, I find this approach a little simpler. The first thing we need to do is to copy our java files in the extension folder. The extension root folder that I used is as follows:

  C:\Program search in Motion\BlackBerry 2.3.0.9\ext\ SDK WebWorks

  In this case, I created a folder sandbox.extension to House my extension:

  C:\Program search in Motion\BlackBerry 2.3.0.9\ext\sandbox.extension SDK WebWorks

  I then copied the folder src housing my files java to get the following file structure:

  

  Note that the CBC/sandbox sand/extension path is no coincidence because sandbox/extension's folder as dictated by the package structure that I used in my java files. More precisely:

  package sandbox.extension;

  The last thing missing is a library.xml file. I used the library.xml files available on Github WebWorks community API page as a starting point and made a few modifications for the following.

  
      
          sandbox.extension.SandboxExtension
      
      
          
              
          
      
      
          
              
          
      
      
          
      
  
  

  Key information

  • The is set to point to the class that implements WidgetExtension. In this chain of three java files, it would be the first file.
  • Under , I set path = 'src' since the real package begins in the src subfolder.
  • Under I've set the id to sandbox.popup.

  This file has been created under the sandbox.extension root folder, specifically:

  C:\Program search in Motion\BlackBerry 2.3.0.9\ext\sandbox.extension SDK WebWorks

  And that's all for the configuration of the SDK. Now, when I have an application that relies on this extension, I don't no need to include something more in my real application because this feature is now integrated directly with my SDK. To use this feature, I need to:

  • Include the feature in my file config.xml .
  • Call the function in my Javascript.

  My file config.xml looks like as follows.

  
  http://www.w3.org/ns/widgets" xmlns:rim="http://www.blackberry.com/ns/widgets" version="1.0.0">
      Sandbox
      Oros
      
  
      
  
  

  Very basic. The element indicates index.html will be our main entry point. The important thing here is that I have included the item with id = "sandbox.popup". " You will notice that it is the same id that we have defined in library.xml.

  Finally, here is a small sample application that gives the user a button. Once this button is clicked, a timer is called during 5 seconds. At the end of those 5 seconds, the extension (and in turn a popup dialogue) is called.

  
  
      
      
      
          Go Button Go!
  
          
      
  
  

  As you can see, we add a to our page which, when clicked, will trigger the function of fire . The function of fire calls setTimeout with a founter of 5000 milliseconds.

  The reason for this is to give you the opportunity to stay within the application, or limit its application with the red end call button. No matter whether you are in the application or the application is reduced, after 5000 milliseconds, the invokeExtension function is called.

  In invokeExtension, you can see call us sandbox.popup.doPopup. sandbox. Popup is the object, we defined in library.xml and put subsequenty implement within our java files. doPopup is the function we defined to be processed in the java files.

  Still, if you have any questions about the foregoing, please let me know.

  Erik Oros

  BlackBerry Development Advisor
  

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