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Replies:
3
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Last Post:
Oct 30, 2008 4:25 AM
by: Shai Almog
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Threads In LWUIT
Posted:
Oct 29, 2008 6:06 AM
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Hi,
I'm coding an application with snapshot function.
I would like the snapshot action to be invoked in background, and meanwhile prompt a dialog to user saying the progress.
I find an article "Progress Indicator & Threads In LWUIT" by Shai:
http://lwuit.blogspot.com/2008/05/progress-indicator-threads-in-lwuit.html
And write a SnapshotTask which extends BackgroundTask:
public void taskStarted() {
dialog = new Dialog("Progress");
dialog.addComponent(new Label("please wait..."));
dialog.showModeless();
}
public void taskFinished() {
dialog.dispose();
previousForm.update();
previousForm.show();
}
public void performTask() {
try {
byte[] img = videoControl.getSnapshot(null);
System.out.println("size of image in bytes: " + img.length);
// release resource
captureForm.release();
attachments.addElement(attachmentService.createPhotoAttachment(img));
} catch (MediaException ex) {
ex.printStackTrace();
}
}
The question is that If I add a "Cancel" Command to the dialog, the dialog can be disposed, but how do I terminate the Task itself?
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Re: Threads In LWUIT
Posted:
Oct 29, 2008 6:33 AM
in response to: sikeh
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Hi,
perform task will need to check a "canceled" flag. stop() was
deprecated in Java due to portability issues.
> Hi,
>
> I'm coding an application with snapshot function.
>
> I would like the snapshot action to be invoked in background, and
> meanwhile prompt a dialog to user saying the progress.
>
> I find an article "Progress Indicator & Threads In LWUIT" by Shai:
> http://lwuit.blogspot.com/2008/05/progress-indicator-threads-
> in-lwuit.html
>
> And write a SnapshotTask which extends BackgroundTask:
> > public void taskStarted() {
> dialog = new Dialog("Progress");
> dialog.addComponent(new Label("please wait..."));
> dialog.showModeless();
> }
>
> public void taskFinished() {
> dialog.dispose();
> previousForm.update();
> previousForm.show();
> }
>
> public void performTask() {
> try {
> byte[] img = videoControl.getSnapshot(null);
> System.out.println("size of image in bytes: " +
> img.length);
> // release resource
> captureForm.release();
> attachments.addElement
> (attachmentService.createPhotoAttachment(img));
> } catch (MediaException ex) {
> ex.printStackTrace();
> }
> }
>
>
> The question is that If I add a "Cancel" Command to the dialog, the
> dialog can be disposed, but how do I terminate the Task itself?
> [Message sent by forum member 'sikeh' (sikeh)]
>
> http://forums.java.net/jive/thread.jspa?messageID=313741
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@lwuit.dev.java.net
> For additional commands, e-mail: users-help@lwuit.dev.java.net
>
Shai Almog
http://lwuit.blogspot.com/
[att1.html]
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Re: Threads In LWUIT
Posted:
Oct 30, 2008 3:45 AM
in response to: Shai Almog
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Hi, Shai,
Do you mean that once performTask() is called, there is no way to stop it?
Regards,
Sike
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Re: Threads In LWUIT
Posted:
Oct 30, 2008 4:25 AM
in response to: sikeh
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Hi,
in Java ME there is no thread.stop method and that method is
deprecated in Java SE. This is unrelated to LWUIT, you can turn on a
flag in your code which is what we (and everyone else) do when we
provide a cancelable task.
> Hi, Shai,
>
> Do you mean that once performTask() is called, there is no way to
> stop it?
>
> Regards,
> Sike
> [Message sent by forum member 'sikeh' (sikeh)]
>
> http://forums.java.net/jive/thread.jspa?messageID=313977
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@lwuit.dev.java.net
> For additional commands, e-mail: users-help@lwuit.dev.java.net
>
Shai Almog
http://lwuit.blogspot.com/
[att1.html]
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