I want to populate my custom listview with some lists of data but data is retrieving from my server. In my case listview is populated when all data from server is retrieved which take some time. I want to load my listview in the ways one by one each time the data retrieved.
In my current logic I use notifyDataSetChanged() for updating the adapter but in this case it refresh all the data at once. Is there any way to load custom list view one by one asynchronously?.
Related
I have two List coming from webservice Like past and future.Sometimes both List have data and sometime only one list have data. And how set the differt RecyclerView for pastList and FuturList with same adapter.
As long as your model objects are the same, it sounds like you need to have two versions of the adapter, where you can assign each list of data to each different adapter.
So if your adapter was MyObjectRecyclerViewAdapter, you could make two instances - pastObjectsAdapter = MyObjectRecyclerViewAdapter();
futureObjectsAdapter = MyOjbectRecyclerViewAdapter();
Then assign one to each of your RecyclerViews and update the list on each with your lists from your webservice.
I have to parse json data form server with volley. Data can be Image and Text. Then I have to show this data in Recycle view. I done this without any problem. But when user click the specific position the cached data will be show in another activity with details. I can do this by duplicate code with passing arraylist and again parse data with volley but I do not want to do that. I already Parsed data so how can I pass this Specific data to another Activity?
You can get the selected data in onClick listener of RecyclerView and pass it to another activity by using intent (with multiple put extras) or Static Object of your list item.
After working on an app for a while I realize I use
adapter.clear()
and
arraylist.clear()
I can see both are working just fine, I would like to know the difference between the two!
Both are called before I start and asyncTask that updates my list with information from my server!
You should not be clearing the ArrayList directly. The ArrayAdapter makes absolutely no guarantees that it maintains the same referenced list given to it. In fact it will change when you perform a search with it's filter. Which would make arrayList.clear() fail.
Rule of thumb, if you ever need to mutate or retrieve the associating data...do it directly from the adapter. Not the list you used to construct it.
Adapter = it contains copies of diff views,arrays
aaraylist holds the data which we want to display in our view.
ex: arraylist<HashMap<String,String>> ah= new ArrayList<HashMap<String,String>>();
the above list contains hashmap
if i clear the arraylist there will be no data to show on listview or gridview so it will be empty
if i clear adapter than it will destroy the copies of array and views so the output will be same
I'm trying to bind some data to a ListView but instead of being data direct from the tables of a database I have already worked data. So what happens is that I do a query, do some calculations and populate an ArrayList and then need to have this data binded to an ListView.
What I thought at first was having this query and calculations inside the onCreateLoader so every time my database changed it would be notified and my array would be repopulated followed by the refresh of the ListView.
My problem is being the implementation of the necessary changes in the Loader and the ArrayAdapter. The Loader I'm used to is the CursorLoader + a SimpleCursorAdapter so I can only use Cursors Objects.
How can I proceed? Where should I look for a solution of this kind?
Thanks
In my application I am fetching the data from a web service in XML format, and parsing it and showing the data in listview. The problem is that if the web service contains 5000 objects then it takes a lot of time to display the data.
Can it be possible to show some data in listview and fetch the data at the same time at the end of the list.
Please provide me some sample code.
If you use convertView in your ListAdapter´s getView method it should not matter how many items you have in the list since the Views are beeing reused.
If your Listadapter takes an array of som sort you could add items to the array continuosly and call
mListAdapter.notifyDataSetChanged();
every time new data is added to the list.
By Using AsyncTask you can do this easily as each object is being fetched can be shown in listview using publishProgress() method while also updating user about what percentage of data hasbeen loaded.
Update:
By the way according to your situation the tool below which is developed by commonsware https://stackoverflow.com/users/115145/commonsware will suits you best...
https://github.com/commonsguy/cwac-endless
cwac-endless: Provides the EndlessAdapter, a wrapper for an existing ListAdapter that adds "endless list" capability. When the user scrolls to the bottom of the list, if there is more data for this list to be retrieved, your code gets invoked in a background thread to fetch the new rows, which then get seamlessly attached to the bottom of the list.