Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Průvodce řešením problémů stáhnout pdf (Strana 155)

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10: Using the messages application

Work with a message

Open a message

1. Retrieve the message store and the folder that contains the message.

Task Steps

Receive a message notification. 1. Implement the FolderListener and StoreListener interfaces.

public class MailTest implements FolderListener, StoreListener { ... }

2. Create code to manage a ControlledAccessException.

Add a listener to the message store. 1. Retrieve the Store object.

2. Add a StoreListener instance to it.

3. Create a try-catch block to manage a NoSuchServiceException.

try {

Store store = Session.waitForDefaultSession().getStore();

} catch (NoSuchServiceException e) {

System.out.println(e.toString());

}

store.addStoreListener(this);

Add a listener to the message store for

batch updates.

> Implement StoreListener.batchOperation().

void batchOperation(StoreEvent e) {

// Perform action when messages added or removed in batch operation.

}

Add a listener to a folder. 1. Retrieve the Folder object for which you want to receive new message notifications.

Folder[] folders = store.list(Folder.INBOX);

Folder inbox = folders[0];

2. Add the FolderListener instance to the folder.

inbox.addFolderListener(this);

3. Implement FolderListener.messagesAdded() and

FolderListener.messagesRemoved().

void messagesAdded(FolderEvent e) {

// Perform processing on added messages.

}

void messagesRemoved(FolderEvent e) {

// Perform processing on removed messages.

}

Get more of a message. By default, the first section of a message (typically about 2 KB) is sent to the BlackBerry® device.

1. To determine whether more data is available on the server, invoke hasMore() on a body part .

2. To determine if the BlackBerry device user made a request for more data, invoke

moreRequestSent() .

3. To request more of a message, invoke more(). The second parameter of more() is a Boolean

value that specifies whether to retrieve only the next section of the body part (false) or all

remaining sections of the body part (true).

if (( bp.hasMore() ) && (! bp.moreRequestSent()) {

Transport.more(bp, true);

}

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