I know my question isn't formulated well.
I'm adding items to an ArrayList downloaded from JSON file and the ArrayList is passed to a ListView.
So what is my problem?
After displaying the data from the ArrayList i wan't to add new items to it so they can be show right after they are added. I managed to do this by setting the Adapter for the ListView again after the data is added.
Displaying the new items should look smooth but instead it looks very sluggish and i know it's not the right way to do this.
I've searched about this problem but couldn't manage to find anything, so for anyone answering
Thanks in advance.
Its very easy
You need not to set the data adapter again to the listview..
instead
call after you downloaded the new data
listView.getAdapter().notifyDataSetChanged();
this function will tell the view to be build again.
In addition Check the following link. here i mentioned a complete code to use listview properly.
Using this we can achieve any listview behavior. We can embed animation also.
Change ListView background - strange behaviour
Hope this help :)
Related
I've extended the example app ChartDataAdapater and ChartItems extensively, but am running into a small issue when it comes to updating already created charts in my listview.
For example, one of the charts in my listview is a linechart with multiple series. I give the user the option to modify the series being displayed, and would like to update the chart on the fly. Right now, I'm adding my charts to the ArrayList<ChartItem> like so, and then updating/creating the adapter:
this.listChart.add(new LineChartItem(chartdata, getApplicationContext()));
chartdata will be updated in a background thread, whenever the user changes the series they wish to view..
My question is, how do I reference that LineChartItem and update it? Should I be saving a reference to the LineChartItem and using that to add to the ArrayList? Is there a 'update' method I should be overriding in my ChartItem class?
I understand I'll have to update the adapter (notifyDataSetChanged) after I update the LineChartItem in my ArrayList<ChartItem>, but I seem to having a hard time wrapping my head around the LineChartItem chartdata update.. Thanks in advance.
What you describe seems like an issue related to the ListView in general.
A solution could be that you somehow remember the index of the item the user is currently working on. Then use that index to get the corresponding data item in your list of data items.
Then udpate that data item with the new data, and refresh the listview.
I need to create a listview that looks like Stack of list items .
The list should be similar to the one that we see in the Notification Bar or else it should be like most recent Apps in Android L.
Can anyone help me with idea of how to implement such type of list or some sample code fragment.
Use Base Adapter . You can define the element of list anyway you want.
Try using ListView for the UI development and implement the suitable adapter for it.
You need to have three things:
Source of data which you want to display your list view.
Fragment/UI [List View] for displaying the data.
An adapter which binds data to list view.
Check for detailed answer without fragment
Tutorial with fragment and list view
I have a question, if I want to load a ListView directly from a database, for example on the first screen I'll have a search button that will search the database and display the results in another screen in a ListView. How would I do that?
CursorAdapter or SimpleCursorAdapter will help you.
Your question has a few parts, if you don't already know how to start.
1) First you will need to learn how to set up a custom ListView and a generic adapter
http://www.vogella.com/articles/AndroidListView/article.html
2) Then you need to figure out how to source your adapter with data pulled from your database
http://androidtuts4u.blogspot.com/2013/02/android-list-view-using-custom-adapter.html
I have a very simple question. I'm working on an Android application where I make use of Simple Adapter for ListView. Now I need to append items to this ListView dynamically. I know it is possible to do so in case of Array Adapters.
It is done as follows:
adapter.notifyDataSetChanged();
Is there any equivalent for the same in case of Simple Adapters? I couldn't find much relevant links regarding this on the net.
Kindly help.
Thanks in advance!
I think not, but you always can create a new SimpleAdapter and call setAdapter again with the new adapter.
If you are going to add/remove elements you, probably, need some other adapter not a SimpleAdapter. Because they say in the docs that SimpleAdapter is 'An easy adapter to map static data to views defined in an XML file'
So i want to make a list that has a number of items on the list but when a item is clicked i would like it to expand in the list to revile more information
i have done something similar with java script before but searching google isnt helping me :(
Does any one know a way i can achieve this or will i be stuck using multiple pages.
I think you are looking for Expandable listView. You can check the example here
Hope this may help u..