Develop Reference

How to keep the List items in recyclerview after loading the list from server

In my app there is a RecyclerView and I load the the list from server, but after that I want to keep that loaded RecyclerView as it is like we see in WhatsApp. I don't want to load the data again after moving to other fragment in viewpager. we can store in local db and retrieve the list and load into recyclerview but this method doesn't work for me because this one also loads the data whenever I change the viewpager.
How can I solve this?
I have searched over google for this but didn't find it anywhere.

android dynamic listview with scroll

I'm creating an android book that use data from database(sqlite) and has six season.
my data is about 1MB and for loading data on listview is slow.I wanna to put a dynamic listview for my project that load 10 item on listview with scrolling each time.
please help me

ListView actually keep in memory items only visible for users - check it for better understanding - http://android.amberfog.com/?p=296.
I think you are talking about lazy loading data from sqlite, so just fetch next 20 (or whatever) items when user scrolled to last item.
I recommend you to switch to RecyclerView. Please check that article for implementation of endless scrolling with RecyclerView.

Android ListView - Setting adapter in a background thread to improve performance?

Situation
I have 3 tabs and currently when I swipe between the tabs there's a lot of lag. Each tab contains a ListView that has an image of a user, and two TextViews with the user's name and a small description (kind of like WhatsApp). Earlier each ListView would also lag and not scroll smoothly, but I went through this guide from the android developers website and then I modified my app to load the images in an AsyncTask and also implemented the ViewHolder pattern. Now, the ListView loads scrolls smoothly, but it takes time to scroll for the first time. In other words, when the ListView is scrolled for the first time it lags, but then it becomes smooth. Another thing you should know is that the data that is populated into the ListView is loaded from a SQLite DB.
Hypothesis
I hypothesized that the reason for this is that even though I'm loading the images in an AsyncTask, because I'm reading content from a DB prior to setting the adapter, that DB access is causing the tab switch and the subsequent first-scroll to be slow.
Question
Will reading the DB in an AsyncTask and then setting the ListView adapter in the onPostExecute method improve my performance? If yes, what's the logic behind it?
I have a bad feeling it wouldn't make a difference because the ListView will be drawn only after the data is provided through an adapter. Here, however, we're loading the data to be fed into the adapter itself from a DB in an AsyncTask.

how to use pegination in Android Listview while fetching SQlite data?

I want to implement populate ListView from SQLite database .But i have lot of records in my SQLite database.Almost 2000 records are there in SQLite database.So I'm going to implement pagination with listview Scrolling. First I want to display 50 records and after that whenever i scroll the listview then again display the next 50 records in listview. Can someone help me . How to implement this.

Look this post How to implement pagination in Android listview may help for you problem. And ListView doesn`t do it by itself be sure ... you need to implement pagination because if you load 4000 records at one time your app will crash eventualy you are on the right way!
Hope to help!

To Reuse images and text in list view when internet is not available

I have created five Horizontal ListView with images and texts in one activity. Using Lazy loading of images concept it is working fine. Now when it is offline, the list is showing blank,ie., no data . I need to implement memory-caching concept, such that when it is offline it will be showing the previous session datas(images & texts).
In oncreate: I am calling the Asynctask. In doinbackground method of asynctask,I am consuming Webservices containing images & texts,then I am passing those datas to the adapter. And in postexecute, I am setting my adapter to Listview.
In adapter class: getview method I am setting the texts and loading the images using lazy loading.
Please help me to get rid of this. Thanks in advance

You should store text etc. in an SQLiteDatabase and store your Images on external storage.