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CHAPTER 6: Personal Information
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BlackBerryMemo existing = (BlackBerryMemo)matches.nextElement(); if (existing.countValues(BlackBerryMemo.NOTE) > 0) { String text = existing.getString(BlackBerryMemo.NOTE, 0); ingredients = text + "\n" + ingredients; existing.setString( BlackBerryMemo.NOTE, 0, PIMItem.ATTR_NONE, ingredients); } else { existing.addString(BlackBerryMemo.NOTE, PIMItem.ATTR_NONE, ingredients); } existing.commit(); } else { template.addString(BlackBerryMemo.NOTE, PIMItem.ATTR_NONE, ingredients); template.commit(); }
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It is very important to set the TITLE before saving a note; if you fail to specify one, a PIMException will be thrown. This is different from required fields in other PIMItem objects, which provide a default value if none is specified.
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Every BlackBerryPIMList allows you to add and remove listeners. The listener will inform you when a change has come to the list: an item has been created, modified, or removed. You only need to respond to the events that interest you, and will continue to receive notifications until you remove the listener. Listing 6-1 shows how to write a simple screen that instructs the user to delete a contact. It does not directly offer a UI for the deletion, but, if the user switches to the address book application and makes the deletion, this screen will be notified, and will update some text using the same StatusUpdater we created for the MediaGrabber app. You can apply the same type of listener to any of the PIMList implementations.
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Listing 6-1. Listening for Contact Deletion import javax.microedition.pim.Contact; import javax.microedition.pim.PIM; import javax.microedition.pim.PIMItem; import import import import import net.rim.blackberry.api.pdap.BlackBerryContactList; net.rim.blackberry.api.pdap.PIMListListener; net.rim.device.api.ui.UiApplication; net.rim.device.api.ui.component.LabelField; net.rim.device.api.ui.container.MainScreen;
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public class RemoveContactListener extends MainScreen implements PIMListListener {
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LabelField instructions; StatusUpdater status; public RemoveContactListener() { instructions = new LabelField(); instructions.setText("It's time to vote someone off the island!"); add(instructions); status = new StatusUpdater(instructions); try { BlackBerryContactList contacts = (BlackBerryContactList)PIM. getInstance().openPIMList(PIM.CONTACT_LIST, PIM.READ_ONLY); contacts.addListener(this); contacts.close(); } catch (Exception e) { System.err.println(e); e.printStackTrace(); } } public void itemAdded(PIMItem added) { status.sendDelayedMessage("No! You're supposed to get RID of people!"); } public void itemRemoved(PIMItem removed) { if (removed instanceof Contact) { if (removed.countValues(Contact.NAME) > 0) { String[] name = removed.getStringArray(Contact.NAME, 0); String message = "Goodbye, " + name[Contact.NAME_GIVEN] + "!"; status.sendDelayedMessage(message); } } } public void itemUpdated(PIMItem oldContent, PIMItem newContent) { status.sendDelayedMessage("Something changed, but they're still here."); } }
After you start the app and view the message, press the red end key on your BlackBerry to background the app. Open the address book and delete a contact. When you switch back to the app, you ll see the updated farewell message.
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CHAPTER 6: Personal Information
App: Selecting Recipients
BlackBerry devices have great keyboards, but it can still be cumbersome to enter a long email address. If you know a lot of people, the odds of remembering everyone s address is fairly small. The rest of the world has had access to integrated contacts for a long while, so your users should be able to do so as well. The next iteration of MediaGrabber will allow you to select your recipient directly from the address book. For fun, after you send the message, use one of the extended BlackBerry user fields to keep track of how many messages you ve sent. This could form the basis for later enhancements, like automatically suggesting the most frequently emailed contacts. All of your changes will occur within the SendingScreen class. Two new methods, selectRecipient() and updateContact(), do the bulk of the work. Listing 6-2 shows the sections of SendingScreen that have been modified to support your new features.
Listing 6-2. Integrating Media Sending with a User s Contacts package com.apress.king.mediagrabber; // Newly imported packages. import javax.microedition.pim.*; import net.rim.blackberry.api.pdap.*; public class SendingScreen extends MainScreen { private MenuItem selectItem = new MenuItem("Select Recipient", 0, 0) { public void run() { selectRecipient(); } }; private void selectRecipient() { BlackBerryContactList contacts = null; try { PIM pim = PIM.getInstance(); contacts = (BlackBerryContactList) pim.openPIMList( PIM.CONTACT_LIST, PIM.READ_ONLY); PIMItem item = contacts.choose(); if (item == null || !(item instanceof Contact)) return; Contact contact = (Contact) item; if (contact.countValues(Contact.EMAIL) > 0) { String email = contact.getString(Contact.EMAIL, 0); receiver.setText(email); } } catch (Throwable t) {
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