how to generate barcode c# code Figure 8-6. Native apps exposing third-party CHAPI apps in Objective-C

Generating Data Matrix 2d barcode in Objective-C Figure 8-6. Native apps exposing third-party CHAPI apps

Figure 8-6. Native apps exposing third-party CHAPI apps
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Tip: The simplest way to explore the filesystem is to open the Media app, press the BlackBerry Menu key, and then select Explore. Once you select the link, MediaGrabber will launch into the sending screen, where you can enter a recipient and send as normal.
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On older device software versions, you don t automatically see CHAPI items listed, but you can still add your own items. You are not restricted to CHAPI operations, either: you can run any sort of arbitrary code that you like.
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CHAPTER 8: Digging in Deep
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To make something useful for both older and newer phones, add a new option to the Address Book app labeled Verify Media Shared. This will check the contact to see if it has previously received any media from the MediaGrabber app. If not, it will offer to open MediaGrabber in its normal mode to send some media. Listing 8-2 shows the complete menu option class, which can be included within MediaGrabber as an inner class.
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Listing 8-2. A Custom Menu Item to Display in the Contacts Menu private static class CheckContactMenuItem extends ApplicationMenuItem { private Registry registry; public CheckContactMenuItem() { super(0); registry = Registry.getRegistry(getClass().getName()); } public Object run(Object context) { if (context == null || !(context instanceof Contact)) return null; try { Contact contact = (Contact) context; if (contact.countValues(BlackBerryContact.USER4) > 0) { // We've sent them media before. Dialog.inform("You have shared media with them."); } else { // Give a chance to select some media. int choice = Dialog.ask(Dialog.D_YES_NO, "No sharing yet. Would you like to send media "); if (choice == Dialog.YES) { Invocation request = new Invocation(); request.setID(CHAPI_ID); registry.invoke(request); } } } catch (Exception e) { e.printStackTrace(); } return null; } public String toString() {
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return "Verify Media Shared"; } }
The logical place to add a custom menu item is in the same startup code that we created for the rollover icon. However, the BlackBerry will occasionally start MediaGrabber even after boot, which could result in the same menu item being added multiple times. To guard against this situation, we use the RuntimeStore to check if the item has previously been added to the native menu, and only insert it if it has not. The device clears out the RuntimeStore every time the device reboots, which is also when it removes all custom menu items. The following code can be inserted below the rollover icon assignment in order to register the custom menu item.
RuntimeStore store = RuntimeStore.getRuntimeStore(); long menuItemID = 0 65fad834642a5345L; if (store.get(menuItemID) == null) { CheckContactMenuItem item = new CheckContactMenuItem(); ApplicationMenuItemRepository repo = ApplicationMenuItemRepository.getInstance(); repo.addMenuItem(ApplicationMenuItemRepository. MENUITEM_ADDRESSBOOK_LIST, item); store.put(menuItemID, item); }
The next time you run the app, you will see the Verify Media Shared option within the address book app. Selecting this item will show the appropriate dialog, and allow you to enter the main MediaGrabber screen if you haven t previously shared media.
WANT MORE
CHAPI offers plenty of possibilities, both as a producer and as a consumer. Consider these options to further enhance MediaGrabber s inter-process cooperation. Create multiple entry points into MediaGrabber, such as one for sending unencrypted files. Experiment with adding support for multiple languages. Try switching the active language on your device and see if the menu item labels change. If using a recent device, use CHAPI to call out from MediaGrabber into other native applications using the BlackBerryContentHandler arguments. Create a new, stand-alone application in a new workspace that uses CHAPI to start MediaGrabber. For example, it could download a media file from the Internet, and then use MediaGrabber to send it to your friends. If you know someone else who is learning BlackBerry development, try splitting these tasks between you. It is great practice to create and expose APIs to other developers, and a more realistic look at how real applications are designed, developed, released, and used.
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