LAMW problem with jProgressBar invalidate
lazarus / 43-Android

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xinyiman · 2022-01-31 14:35

Hi, I have a procedure that downloads more than 60,000 records from a
json server and I would like to show the update through the
progressbar. I use this code:

for ... do
begin

                         if (Self.ProgressBar1.Progress mod 100)=0
then
                         begin
                            Self.ProgressBar1.Invalidate;
                            //Self.Invalidate;
                         end;

end;

But it does not work. I see the progressbar update only when it has
finished the whole loop. How do I resolve?
Thank you

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loaded · 2022-01-31 16:49

Hi,
The operation you want is done using AsyncTask.
LAWM has a sample demo on this subject.
You can find it in the ....\lazandroidmodulewizard-
master\demos\GUI\AppAsyncTaskDemo1  folder on your system.

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xinyiman · 2022-02-04 13:36

I tried the example you suggested, but I have two problems.

1. If I don't put the sleep in the DoTask the program crashes

2. If in the DoTask I enter

jSqliteDataAccess1.InsertIntoTable(sql);            

crashes.
My need is to populate a sqlite db with more than 65000 records
retrieved from a json on web server. I can download the json but I
can't save it in sqlite and at the same time update the progress bar.

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xinyiman · 2022-02-04 15:00

Forget it, I fixed myself with recursive jtimers where I process N
records at a time.