Change Orientation Problem?

[Malky]

Hi, I have an app with about 5 scrollviews and it seems although they have been created, every time I change orientation, I have to recreate them from scratch which causes delays in navigation?

It's bad enough trying to keep track of each one when moving back and forward, without having to recreate sometimes if the orientation changes.

Malky

 

[eps]

You could always define them globally...

 

[Malky]

The problem is in the latter scrollviews, the content can change anyway depending on the selection from the first?

The app works fine in Portrait view, it also works ok after a tilt on the first few which are pretty much static, but the others screw up when changing orientation and back?

Malky

 

[Erel]

Activities are recreated when the orientation changes. You need to rebuild the UI. StateManager can help you with this task.

 

[Malky]

Hi Erel, is there an example of Statemanager being used for something this extensive?

I had considered it before, but as I am using a DB anyway to store data, I have been using that, but I think the problem could be that the db is not initialised again after and orientation change.

Just seems very unresourcful having to recreate about 6 scrollviews every time the screen changes?

Cheers,

Malky

 

[Erel]

Just seems very unresourcful having to recreate about 6 scrollviews every time the screen changes?

This is how Android works.

StateManager doesn't create the views for you. It only saves the user state. In the case of ScrollViews it is only the scroll position.

 

[Malky]

Cheers Erel, I may just regulate the view to portrait to save code and memory although I didn't want to go down that route.

I'll give it another try tonight to see if I can make it any quicker first.

Thanks for your valued input once again.

Malky

 

[Malky]

Maybe could I ask for one more piece of advice please?

When changing orientation and having to recreate scrollviews after an orientation change OR having to change the content if the previous list selection has changed, does it speed things up any if you clear/empty the scrollview contents?

At the moment I don't do that, but it does work?

Thanks,

Malky

 

[Erel]

Clearing up the list or scroll view before the orientation changes will not have any effect.

If you need to modify an existing list then it is better to use a class such as CustomListView class.

 

[Malky]

Hi Erel, this custom list example looks really fast (although there are no images in it), I'll give it a try, but.... I also see you have a view already created in the designer.

My question is, would it be quicker to create the panel(s) in real time (I read on here somewhere that the pre-designed panel load time is slower), plus looking at it, I would assume I would be better having a separate panel for each CustomListView? Possibly 6!

Does this seem logical?

Cheers,

Malky

 

[Erel]

The time difference between a Panel created by code and a Panel created with the designer is insignificant.