Java Development

[arindamhit]

I am developing one application where i will launch a url in the browser from which i will launch my application.

Suppose if i will click google.com, and press enter, it will launch my application. For that i tried with theHttpFilterRegistry API.

For reference i am using the HTTPFilterDemo application. But currently while launching the app, i am getting the NullPointerException.

I wrote the below code i the openFilter Method:

  public Connection openFilter( String name, int mode, boolean timeouts ) throws IOException
    {
        Logger.out("Protocol", "it is inside the openFilter method");
        _url = name.substring(2);
        _requestHeaders = new HttpHeaders();
        _responseHeaders = new HttpHeaders();
        _responseHeaders.setProperty(HttpProtocolConstants.HEADER_CONTENT_TYPE, "text/html");


        // Attempt to parse for the file name
        int slashIndex = name.indexOf('/', 2);
   if (_resultData == null) 
        {

final int modHandle = CodeModuleManager.getModuleHandle("AppLaunchBrowser");
                    Logger.out("Protocol", "here is the module handle:::" +modHandle);
                    final ApplicationDescriptor[] apDes = CodeModuleManager.getApplicationDescriptors(modHandle);
//                  final String[] arguments = new String[1];
                    final ApplicationDescriptor appDescriptor = new ApplicationDescriptor(apDes[0], new String[]{});
                    Logger.out("Protocol", "here is the app descriptor:::" +appDescriptor);
                    try {
                        final int appCode = ApplicationManager.getApplicationManager().runApplication(appDescriptor, true);
                        Logger.out("Protocol", "here is the app code:::" +appCode);
                    } catch (ApplicationManagerException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
     }
        return this;
    }

 And in the application class i am creating alternative entry point and using like below:

public class AppLaunch extends UiApplication{
    public static void main(String args[])
    {
        Logger.out("AppLaunch", args+"length of the arguments::::" +args.length);
        if((args != null) && (args.length > 0) && (args[0].equals("background")))
        {
            Logger.out("AppLaunch", "in the alternate entry point");
//          Logger.out("AppLaunch", args+"length of the arguments::::" +args.length);
            HttpFilterRegistry.registerFilter("www.google.co.in", "com.innominds.ca", false);


        }
        else 
        {
            Logger.out("AppLaunch", "Inside the Applaunch");
            AppLaunch theApp = new AppLaunch();
            theApp.requestForeground();
            Logger.out("AppLaunch", "created the app launch object");
            theApp.enterEventDispatcher();
//          Logger.out("AppLaunch", "in the alternate entry point");
//          HttpFilterRegistry.registerFilter("www.google.co.in", "com.innominds.ca", false);
        }
    }

    public AppLaunch()
    {
        checkPermissions();
        showTestScreen();
    }

     /**
     * This method showcases the ability to check the current permissions for
     * the application. If the permissions are insufficient, the user will be
     * prompted to increase the level of permissions. You may want to restrict
     * permissions for the ApplicationPermissionsDemo.cod module beforehand in
     * order to demonstrate this sample effectively. This can be done in
     * Options/Advanced Options/Applications/(menu)Modules.Highlight
     * 'ApplicationPermissionsDemo' in the Modules list and select 'Edit
     * Permissions' from the menu.
     */
    private void checkPermissions()
    {

        ApplicationPermissionsManager apm = ApplicationPermissionsManager.getInstance();
        ApplicationPermissions original = apm.getApplicationPermissions();



        if(original.getPermission(ApplicationPermissions.PERMISSION_BROWSER_FILTER) == ApplicationPermissions.VALUE_ALLOW)
        {
            // All of the necessary permissions are currently available
            return;
        }


        ApplicationPermissions permRequest = new ApplicationPermissions();
        permRequest.addPermission(ApplicationPermissions.PERMISSION_BROWSER_FILTER);

        boolean acceptance = ApplicationPermissionsManager.getInstance().invokePermissionsRequest(permRequest);

        if(acceptance)
        {
            // User has accepted all of the permissions
            return;
        }
        else
        {

        }
    }


    /**
     * Shows the test screen to allow the user to exercise the application
     * permissions capabilities.
     */
    private void showTestScreen()
    {
        UiApplication.getUiApplication().pushScreen(new AppLaunchScreen());
    }
}

 can any one please help..sorry for posting almost the total code..

[peter_strange]

Which statement is giving you the NPE?

[arindamhit]

That is the problem. I am not getting in which line NPE is coming. Because when i am trying to debug in the simulator, it is telling debugger not attached and not able to debug. As i am putting the logs, every log statement is printing in protocol.java class. it is returninng me the appcode which i am printing at last.                                                    

only in my application class logs are not printing. Dont know why?? But it is first going inside that class to register filter..

[arindamhit · Accepted solution]

Finally i was able to resolve this issue. Actually NPE is coming in some other callback methods because i was implementing the FilterBaseInterface.