I'm creating android tv app but I don't know how to implement endless scroll in Verticalgridfragment, i use ArrayObjectAdapter, can someone help me do that?
I'd love to give you a full answer with oodles of code samples but I'm not at my work computer. Basically you'll implement the onItemSelected listener in your Browse/RowsFragment (it should be something like setOnItemViewSelectedListener() from your fragment).
Then you do a check to see if the currently selected element is within 5 or 10 or 15 elements from the end of the list. If it's within that threshold, then make the request for the next page of your list and call addAll() on your adapter when you get the next page. You can optionally show a "loading card" while the next page request is in flight and remove it when you get your data.
I based my implementation off of this open source project - while it's not perfect it should be enough of a code sample to get your started.
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I'm building my Android App using Viewpagers, and I built a ListView that takes 8 seconds to show the full Items.
The page doesn't update the view automatically, thats why the Listview appears empty when it is shown for the first time.
So, I was thinking about creating a new page called loading, and hide the page with the listview, and only show it when the Listview items are already there.
To do that, I would like to know how can I hide pages.
I tried to use an Handler and change the number of pages after 8 seconds, but it didn't work, can you guys give me any idea of how can I do that?
Thanks.
You shouldn't create a new page called loading,it is not a good way to solve it. You can u get data in oncreat first time,then update data by a timeror handler+timertask and so on.
I'm building an Android magazine-reader for our campus publication that pulls articles from a web service and displays them in a ViewPager.
To minimize the initial loading time, I want it to pull a relatively small number of articles (say 10) to begin with. Once it has pulled and displayed those articles, I want it to immediately begin downloading/deserializing the next 10 articles while the user is looking through the first set. Likewise, when they reach the 11th article I want it to go ahead and download the next 10, so that the user can continually browse without ever having to wait for more articles to load. This seems easy enough to accomplish using AsyncTasks, but I've hit one small hitch: When the next set of articles is downloaded and added to the ViewPager, it jumps back to displaying the first page.
How can I add views to the end of the ViewPager's dataset without changing the article being displayed to the user?
you will want to use the Endless Adapter created commonsware.
Or you can open the page again after refreshing the content of the ViewPager. Get the article id of the article user is reading. Open the same article after the ViewPager is refreshed.
I want to implement functionality where a listview loads a set number of views, but at the end of the scrolling it has a spinner in that view, while it loads more views
the official android twitter app has something like this, where it shows you old messages from your timeline but at the bottom of the list it will load more after running a spinner. you can still scroll up and down while this thread is happening without breaking anything
how would this be done? insight appreciated
i think by spinner u mean blocking screen ?
anyways what u need is pretty common, just search for listview implementation in android
here is one of the link i still had:
http://blog.zjor.ru/2010/12/loading-list-data-asynchronously-in.html
also check this if u really want to go to that extent ;)
https://github.com/commonsguy/cwac-endless
basically, it would probably be something like:
Load some data (use a limit)
When you enter the bindView of your last element, change your limit (may be by joining the cursor to another one)
i am using a list view in which i want to directly shift to particular position when i run my code. i m using listview.smoothScrollToPosition(22) which will show the scrolling effect.. which i do not want to show. i want to directly display 22 position of list view.
i used other methods like listview.setselection(), listview.scrollTo() which doesnt work??
Kindly, help me out
Thank you
setSelection is what I use in a public domain app I develop. You can read the code here. It scrolls the ListView to the position I specify.
Perhaps you could post your code if this method isn't working for you?
I have implemented a Customised ListView using BaseAdapter and Lazy loading concept to load the images for the list items.
I am working with the RESTFul services . The webservice method defines the no of items in each page(20 items per page) & the total no of pages present(5 pages). Now , I am able to load the first page accordingly .
I need to call the webservice method again to download the next page contents accordingly & display it in the similar way as the first page.
Kindly provide the logic/sample source code on how to implement the pagination if anyone has already implemented.
Also , I have seen in few of the Android applications in the Android market , that the progress dialogue is displayed at the end of the list while loading the items , maybe the second page contents.
Kindly provide hints if someone has already implemented so.
Kindly provide the logic/sample source code on how to implement the pagination if anyone has already implemented.
See my EndlessAdapter.