Menu remains visible after you make the selection, and does not show Popupscreen
Hey. Unable to get a (a gaugefield) on a Popupscreen progress bar to show. It is called from a menu. The user clicks a menu item, and a method is called. The method among other pushes a Popupscreen containing a Gaugefield on display battery-code below. Then, he starts a thread which downloads an image and using join() to wait for it complete (long story). Then, in the thread of events, it appears the Popupscreen.
The menu does not disappear when you click on it in the Simulator (JDE 4.7, the Bold 9700 sim), but the download happens. Once the download is complete, the menu disappears, the Popupscreen is shown and he tried to pop() Popupscreen, causing an IllegalArgumentException.
I tried to split the method into two methods, the download happened in the 2nd method, because I read the forum search that the UIEngine don't update the display until the method finishes (it runs in the event thread). But it made no difference...
How can I get this menu to disappear immediately and the push (popup) to work?
See you soon!
Justin.
progressbar = new GaugeField("", 0, 100, 50, GaugeField.NO_TEXT);
progress = new PopupScreen(new FlowFieldManager()) { protected void OnDisplay() { super.onDisplay(); /*cancelButton.setFocus();*/ } };
globalTiles.pushScreen(progress);
progress.add(new LabelField("Downloading (rest of) picture ..."));
progress.add(progressbar);
progress.setFocus();
if (!threadbg.isAlive()) {
threadbg = new ThreadForBgDownload();
threadbg.start();
}
else {
// Show the progress bar, mostly complete (it is running and was in the bg). Game will start after last bit done
}
threadbg.join(); // Wait for download thread to complete and 'die'
globalTiles.popScreen(progress);
Rule #1: all display updates should occur on the thread event or synchronized on the lock of the event.
Rule #2: the thread of events (or now the lock of the event) should never be blocked by lengthy operations.
The scenario you sketched out is usually handled like this: menu item run() method don't whatever immediate user interface updates are necessary and starts a worker thread. It does not wait until the thread ends before returning. (If so, updates the user interface include pushing a "Please wait" or progress pop up). The worker, at the same time, begins to do its stuff. When it's time to update the user interface (either because the task is completed or to view progress) the worker thread usually called invokeLater (Runnable) (a method in the Application class) where the executable run() method updates the user interface. If the worker thread must receive user input in his work, he can use invokeAndWait (Runnable), where the executable not all interactions of the user and stores the user entry somewhere so that the worker thread can grab after invokeAndWait() returns.
Although the synchronization on event lock works perfectly well, it is more common for some reason any to invoke a Runnable, perhaps because the latter clearly encapsulates in a separate object the work to be done on the event thread.
The above policy is the basis of the excellent Peter Strange example I linked to before.
Tags: BlackBerry Developers
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