Android Question Deal with big data

[chrjak]

Hey Community,

I have a problem. There is a 'ShowValues' activity, that loads many numbers and shows them in labels. (No that process can't be improved) That loading takes a long time so i want to show a moving progressdialog to the user. But the first problem I had was that I called Progressdialogshow before the for next loop and progressdialoghide after the 'next' command. That only opened the progressdialog at the end of the loading process for about a half second. Now I fixed it that way:

Startactivity:

Sub OpenValues
CallSubDelayed(ShowValues, "showloading")
End Sub

ShowValues Module:

Sub Activity_Create
Activity.LoadLayout("Layout")
ProgressDialogShow("Loading")
End sub

Sub showloading
    CallSubDelayed("", "Calculate")
End Sub

Sub Calculate
'Calculating Process & For/Next Loop
Progressdialoghide
End sub

But the problem was now that the progressdialog was lagging. The dialog field was shown but the progressbar didn't move/wasn't even shown because of lagging.


I already tried taking the loop out and calling the sub (Callsubdelayed("", Calculate)) after calculating one value again and again till everything is calculated. But that didn't update the progressdialog so that the progressbar moves. it's still lagging...

Could you please help me?

 

[Erel]

You can call DoEvents (inside the loop) to allow the progress bar to animate.

 

[chrjak]

Thats awesome *.*

But it's a lot slower right!? When i was testing without doevents the loading process took ~ 20 secs and with the doevents >10min....

 

[chrjak]

Additionally it doesn't work when you try to update the progressdialog text before the doevents in the loop, right? (e.g. to show a progress - "12/90000 done")

 

[DonManfred]

How often do you call DoEvents???

 

[chrjak]

before the next
eg.

'Progressdialog
for i = 0 to list.size -1
'Calculate
Doevents
next

 

[DonManfred]

What is the result of

log( list.size)

?
Again:
How many iterations do you do?

 

[chrjak]

about 35.000

but its up to the user. it can be even more...

 

[DonManfred]

about 35.000

Then you should call DoEvents every 1000 iterations or so. Just try out other values.

    for i = 0 to list.size -1
        'Calculate
        If i mod 1000 = 1 Then DoEvents
    next

 

[chrjak]

very laggy but faster

thanks

 

[chrjak]

I made some tests and with that mod 1000 the calculating process is 5 seconds faster then the standard one