Problem with Scroll Position

[Bill Norris]

I have a scrollview with about 15 items. User selects and item which loads the appropriate activity. I store the scrollposition of the scrollview in a global variable, so that when user comes back to the activity, I can have the scrollview be at the same scrollposition it was originally, rather than going back to the top. For some reason, even though the correct scrollposition is being stored and properly retrieved during acitivy_create, the scroll view always goes back the top (scrollposition of zero). During debug, if I put a breakpoint anywhere in the activity_create code, the scrollview will set at the correct position that I have saved, but without the break point, it goes back to the top every time. BTW, I am using activity_finish by necessity for other reasons, so leaving the acivity in memory is not an option.

 

[Erel]

Store the position in a process global variable.

I also encountered this issue when writing StateManager. The solution is:

ScrollView1.Position = p
DoEvents
ScrollView1.Position = p

You might want to use StateManager.

 

[Bill Norris]

RE:

The position is indeed stored in a process global. Simply adding the doevents and then again the line afterward to set the position solved the issue.

 

[texwillerx]

I had the same problem. One line didn't solve my problem. Only after I put the two lines in a for loop solved the problem (i=1 to 10).

 

[Erel]

You can use the reflection code from this example: [class] Modified CustomListView with "Pull to refresh" feature

It immediately scrolls the ScrollView to the desired position. Without any animation.

 

[texwillerx]

Erel, thank you for this beautiful code.

Unfortunately, it works for all cases, except for the first setting of the pos when the program starts.

I use 5 as the for loop index, it works fine, then.

Best Regards

PS: Don't you ever sleep?

 

[Erel]

PS: Don't you ever sleep?

It's 9:30 am here. Just started...

 

[hookshy]

ScrollView1.Position = p
DoEvents
ScrollView1.Position = p

Works great for me too , i had the same problem as Bill
in activity resume scrol.request focus returns false

It seems there is an issue with scrol position , the code works only first time app starts

 

[Erel]

ScrollView.ScrollToNow will be added in the next version.

You can use this code for now:

Dim jo As JavaObject = ScrollView1
jo.RunMethod("scrollTo", Array As Object(0, p))