Ah ok, I get it now, I thougth wrapping the TaskListener with a
TaskAdapter caused the actual task to be executed in the UI thread,
since the listener is needed for the task to run in the background. It
was a bit difficult to actually understand how Tasks work, I believe
it'll be more intuitive to allow tasks to be executed async without
actually adding a listener (I don't really use it most of the times),
perhaps by adding an extra argument to the Task#execute() method?
El 12/07/11 11:07, Greg Brown escribió:
How are you attempting to use TaskAdapter? TaskAdapter wraps a TaskListener and
is only called once when the task completes. It sounds like you want to update
your label multiple times while the task is executing, so TaskAdapter wouldn't
help with that.
G
On Jul 12, 2011, at 12:02 PM, Edgar Merino wrote:
Although I do have a question here, I though executing a Task using a
TaskAdapter to wrap the TaskListener was supposed to have this same outcome,
but I'm not able to change the label using a Task instead of a Runnable, can
anyone explain this please?
El 12/07/11 10:37, Edgar Merino escribió:
Thank you Chris, that did the trick!
El 12/07/11 00:48, Chris Bartlett escribió:
Edgar,
Search the mailing list archives for previous posts that refer to
'ApplicationContext.queueCallback(Runnable)'
apache-pivot-users.399431.n3.nabble.com
apache-pivot-developers.417237.n3.nabble.com
It is used to queue a Runnable to be executed on the UI thread. If wrap your
call to label.setText() in a Runnable, and execute with queueCallback(), you
should see the label update properly.
Chris
-----Original Message-----
From: Edgar Merino<[email protected]>
Sent: 12 July 2011 08:07
To: [email protected]
Subject: Task countdown and Labels
Hello, I'm trying to implement a simple countdown animation using a Task
and a Label: when the task is executed, it goes through a loop that
repeats five times and does two things here: update the label with the
current counter and sleep a second. However, sometimes I don't see the
label updating until some processing on the application is finished, is
there a way to force the application to wait for the label to be updated
first before trying to assign a different value to its text property?
Here's some sample code:
public class CountdownTask extends Task {
private Label label;
public CountdownTask(Label label) {
this.label = label;
}
public void execute() {
for (int i = 5; i>= 0; i--) {
label.setText(i+1);
Thread.sleep(1000);
}
}
}
I've tried running this both sync and async and I always get the same
result.
Thanks in advance,
Edgar Merino
