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.
Related
I'm using pagination 3 to load paginated data.
I encountered this problem when the first few pages have empty data. The recyclerview makes an automatic scroll the first items are not visible.
I solved this by scrolling the recyclerview back to the first item as soon as the adapter receives items for the first time, but this doesn't seem like a very good solution to me.
What's the best way to deal with these empty pages? Is there any way to prevent the load Method to send empty pages to the adapter?
Note that the endpoint responses are not completely empty, just the first few pages in some cases.
I can't define which is the first page that contains data before making the query.
I want to three things :
1.Want to show 50000 contacts from db
2.Fast scroller implementation
3.Filter implementation (Edittext)
Currently what i'm doing is :
I Listed contacts in list view by pulling data in worker thread(using aynctask). But in single query itself I'm pulling 50000 contacts. That takes some time and sometimes facing Out-of-memory exception.
I used list-view indexer for fast scroller
using Gauva library for filtering
Please suggest some efficient way to achieve this. Anyway user is not going to see 10000 immediately but i need to implement fast scroller that why pulling all data
You may need to increase the list size dynamically...Refer the below answers
Android Endless List
Dynamically increasing the number of elements in a listview
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.
I'm going to implement a dynamic ListView: By spending little time, ListView will populate more items from a local file when you are scrolling downward.I used technique like this to implement such dynamic list:http://mobile.dzone.com/news/android-tutorial-dynamicaly
Problem: Number of Items to be displayed is too large. So if I just keep adding them to data source of ListView Adapter, data source will consume too much memory and finally it will lead to application crash by scrolling more and more.
Question: How can I remove some of items that are not displayed from datasource of ListView such that user do not get noticed? It is not important that user need to wait while scrolling up/down for fetching data.
when you are using listview using base adaptor then adaptor will automatically get called whenever user perform scroll and auto destroy unseen elements.
I have a huge amount of data in the sqlite database and I use android CursorLoader with ContentProvider to display them in the ListFragment. Well, it just load all the data to the list. My question is, how can I load the data with pagination? Or, just like when I scroll to the bottom of the list, it' ll load the next page' s items?