FileSystemJournalListener; am I crazy or what?

Pretty well dug in the demo, I can't get this type of work. The order of events (I think?) is supposed to be:

(1) manufacturer of the screen load.

(2) class form has a private member of the FileExplorerDemoJournalListener class that implements FileSystemJournalListener.

(3) FileExplorerDemoJournalListener class has a constructor that takes the screen as an argument and keeps her in a private variable.

(4) screen class going in the background (or otherwise remains active), and if the FileExplorerDemoJournalListener class lives to watch the file system.

Don't know what Miss me, but I should get of the journal entries of this, and I get nothing.

Import net.rim.device.api.io.file.FileSystemJournal;
Import net.rim.device.api.io.file.FileSystemJournalEntry;
Import net.rim.device.api.io.file.FileSystemJournalListener;
Import net.rim.device.api.ui.UiApplication;
Import net.rim.device.api.ui.component.Dialog;

/**
* Listener to determine where the files have been added to the file system.
*/
/ * package * / final class FileExplorerDemoJournalListener implements FileSystemJournalListener
{
Private JTrackScreen _screen.
private long _lastUSN; // = 0;
   
   
/**
* Constructor.
*
@param screen to update when events occur.
*/
FileExplorerDemoJournalListener (form JTrackScreen)
{
_SCREEN = screen;
}

/**
* Notified at the file system event occurs.
*/
Public Sub fileJournalChanged()
{
long nextUSN = FileSystemJournal.getNextUSN ();
String msg = null;
       
for (long nextUSN - 1; lookUSN = lookUSN > = _lastUSN & msg == null;--lookUSN))
{
Entry FileSystemJournalEntry = FileSystemJournal.getEntry (lookUSN);
           
It has not found an entry.
If (input == null)
{
break;
}

Check if this entry has been added or deleted.
Path String = entry.getPath ();
           
If (path! = null)
{
switch (entry.getEvent ())
{
case FileSystemJournalEntry.FILE_ADDED:
MSG = 'File was added.';
break;
                       
case FileSystemJournalEntry.FILE_DELETED:
MSG = 'File has been deleted.';
break;
}
}
}
       
_lastUSN must be updated before you call showMessage() because this method
pushes a modal screen in the display stack, which blocks this thread.
If the modal screen of the wire then treats a log event file on this
name of the application, the for loop above may end up the same treatment
event that we block on.  Update _lastUSN before blocking prevents
the same log file processing twice event and therefore prevents
the same dialog box appears twice.
_lastUSN = nextUSN;
       
If (msg! = null)
{
showMessage (msg);
_SCREEN.updateList ();
_SCREEN. WriteLog (msg);
}
}
   
   
/**
* Displays the message in a dialog box.
*
@param msg the message to display.
*/
Private Sub showMessage (String msg)
{
synchronized (UiApplication.getApplication () .getAppEventLock ())
{
Dialog.Alert (MSG);
}
}
}

You call Application.addFileSystemJournalListener to register your FileSystemJournalListener?

Tags: BlackBerry Developers

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