A lot of very slow = :-(LabelFields

Hi all

I have a screen with a VerticalFieldManager. I'm running in the speed problems in two common cases:

(1) creating the labelfields put in the optimization of resources. Here is some pseudo-code of what I do:

labels = new LabelField[200];
// this for loop takes a couple of seconds on a real device
for (int i=0; i < 100; i++) {
  title = new LabelField("Title", FOCUSABLE);
  title.setFont(bold font);
  subtitle = new LabelField("Subtitle", NON_FOCUSABLE);
  labels[i*2] = title;
  labels[i*2+1] = subtitle;
}

// this next part goes quick, no problem
vfm = new VerticalFieldManager();
vfm.addAll(labels);
myScreen.add(vfm);

A glance in the Profiler indicates that 90 + % of the time is spent in the UI during the loop code for, a lot of Field.applyTheme () of the time, a lot of time thus setText(). (I'm not on the event at this point thread.)

(2) eliminating a pair of labelfields (title and subtitle) optimization resources takes a few seconds. I use deleteRange (x, 2), and it's very slow, unfortunately.

I did research in the forums but have not been able to find ways to accelerate. Advice would be appreciated.

Thank you

Steve

Looking at your code, I would not suspect the time has been spent in the loop for. Until these are added to the screen, my experience is that the creation of a load of fields does not take as long. I thought that this was the process of these specify the screen once they have been added, which takes time. If the loop was directly by adding them to the Manager and the Director was already on the screen, I can imagine that takes a long time.

To get the best performance of something like this, I recommend that you watch the ListField. It's a little more complicated to start, but the performance gain you will get is significant.

Tags: BlackBerry Developers

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Duration 09:05

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Click the [Support] links to help with non-Apple products.

Click the [details] links for more information on this line.

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[Technical details] - [User Guide] - [warranty & Service]

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1 2.5 GHz Intel Core i5 CPU: 2 strands

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