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Maintain your scroll position when you refresh. Refreshing an Android List. View is a pretty common thing - - but the best way to do it isn't immediately obvious. Change Tcp Window Size Vmware Certification. Here's my progress through the different patterns. The Obvious. I figured that when I've downloaded the new list of stuff I want to show, that I could just create a new adapter and stuff it into the list.

Android ListView: Maintain your scroll position when you refresh 17 June 2011. PUBLICATIONS. Chicago Point "A Prime Source of Backgammon Information." Free online material and many links to online casino sites. Download for free the final issue.

Event. Log. Adapter event. Log. Adapter = new Event. Log. Adapter(m. Context, events). Event. List. View.

Adapter(event. Log. Adapter). This works, in that the list gets updated. But it always scrolls all the way back up to the top.

Sometimes that might be what you want, but most of the time you'll want to maintain your scroll position. The Naive. I tried getting pixel- level scroll position using get. Scroll. Y(), but it always returned 0. I don't know what it's supposed to do. I ended up going with a solution that got close to maintaining your scroll position. Position = m. Event.

List. View. get. First. Visible. Position(). Event. Log. Adapter event. Log. Adapter = new Event. Log. Adapter(m. Context, events). Event. List. View.

Adapter(event. Log. Adapter). m. Event. List. View. set. Selection(first. Position). This figures out the first item in the list you can see before resetting the adapter, and then scrolls you to it.

This maintains your scroll position within some unknown/arbitrary range, and can cause you to jump around in the list a little bit when you refresh. If you're scrolled halfway through a list item, it'll snap you to the top of it so it's completely visible. Unfortunately, if you're scrolled halfway through a list item, that probably wasn't the one you were paying the closest attention to. The Elegant. There had to be a better way! And, of course, there is. Romain Guy, an Android developer who haunts Stack Overflow and Google Groups dropping golden hints when people ask questions, pointed out: The problem is that you are creating a new adapter every time you reload the data. That's not how you should use List.

View and its adapter. Instead of setting a new adapter (which causes List. X Force Keygen Revit 2010 Product. View to reset its state), simply update the content of the adapter already set on the List. View. And the selection/scroll position will be saved for you. There are two problems with Romain Guy: 1) he doesn't have a central repository of these hints/answers so I can learn what to do before doing everything wrong first, and 2) they really are just hints, in that they point you in the right direction without getting you all the way there. In this case, yes, updating the adapter without creating a new one every time will maintain your scroll position. Except that you'll frequently get an .

Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. But if it does have an adapter, then I just refill it. And it maintains my scroll position exactly!