i have the following problem. I fill a ListView with a custom ArrayAdapter with data from a BD. However, in background, i'm updating those datas from the info provided by an API, so the idea is when the update finish, the adapter shows the updated data instead its "old version".
The problem is that when i do that, i notice a lag while the adapter is updating itself. Is the any efficient solution to avoid this?
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In Android, is there a similar method to the repaint() in java?
View 1 Replies View RelatedIs there anyway to force ListView to rebuild/repaint itself? i.e. re-get item from the ListAdapter (it can be a CursorAdapter or ArrayAdapter) and then repaint the all the list view which are visible?
View 2 Replies View RelatedI have gallery which contains a listview.
when you scroll sometimes the views inside the listview doesnt appear. i can see a shadow which belongs to listview but nothing inside listview appears
i have tried using invalidateviews on listview whenever the view becomes selected.
I am not sure how to resolve this.
In Android, is there a similar method to the repaint() in java?
View 30 Replies View RelatedIf i use repaint() method.I got error message. What is the solution for that.Can we use repaint() in android.If not what is the alternate solution for it?
View 2 Replies View RelatedLets say I have 1 - 1,000 in a list and I click on 250. When I push the back button I want to go back to 250 not all the way back up to 1. Is this possible?
View 1 Replies View RelatedIs there a way to use ListAdapter in preferences screen ? or i must use only chekboxpreference, textpreferences, etc....
View 1 Replies View RelatedI've built an application that loads XML from a server, then creates a list of items and with that I create and adapter that I set with setListAdapter(my adapter);
The problem I'm having now is that creating the list and adapter takes time, so I was thinking on creating just like 20 entries and populate the list, then create the rest on runs background or maybe when the person gets to the bottom (like gmail application).
I am trying to use ListView and ListAdapter. If I create a simple Android project and add a ListView as the content view, and set it's adapter to my adapter based on ListAdapter, everything seems to work. My ListAdapter's 'getCount' is called, and I return 3, my 'getViewTypeCount' is called and I return 1, my 'getItemType' is called and I return 0, and for each item, my 'getView' is called and I return a TextView. Everything works, and the list is displayed with 3 items.
Now if I try and do the same thing in a more complicated environment, it does not work. My 'getCount', 'getViewTypeCount' and 'getItemType' methods are called, but the 'getView' method is never called and the ListView appears empty.
Now I know that I must be doing something wrong in the more complicated case, but I cannot see what it is. The code is really too involved to post here, but I was hoping that someone could give me some ideas as to why my 'getView' is never called even though I return 3 from my 'getCount' method.
I'm crating tab view using this tutorial: Link<http://developer.android.com/resources/tutorials/views/hello-tabwidge...>. Now I need to reload tab content data when user view that tab. is there any way to notify ListAdapter ?
View 2 Replies View RelatedIs there any way to notify ListAdapter? Because i need to load Tab content data when user click in that Tab.
View 1 Replies View RelatedI have a problem with adding new items to ListView.
I use custom adapter MyListAdapter. I do that way:
CODE:...................
My code works like this to list all items in my String array - itemsarray
CODE:....................
However, I know by this call that I only want to list the first X number of items from itemsarray. How can I load only the first X items form itemsarray into the ListAdapter?
I cant figure out how to perform an onClick on my ListAdapter.
Here is my code:
CODE:.....................
I want to be able to click on an item from the database, then go into a view that only contains info for that item. My class currently extends ListActivity. I've tried OnItemClickListener, but I dont know what else to use to make it work.
I'm experimenting with the Android platform, and I'm beginning to love it, but right now I'm stuck, at this cursor/list adapter problem-thing.
The thing is, that I request a function, returning a data object, with several properties I'd like to map to different TextView's.
My list_item.xml
CODE:...........
So what I would like to do is: Map a property of an array of objects to several fields in the file.
public class List_View extends ListActivity {I would like to show stored data from database into a ListView. Code... Title and Date only.
View 1 Replies View RelatedI want to look at the source code for the ListAdapter class without downloading the entire Android source code tree. Is there a way to do that?
View 4 Replies View RelatedI'm populating a list from the DB and I have a image field in the DB which contains a URL to a image file.
ListAdapter adapter=new SimpleCursorAdapter(this, R.layout.row, constantsCursor,
new String[] {"title", "subtitle", "image"}, new int[] {R.id.value, R.id.title, R.id.icon});
However, the other fields are populated, but the image remains empty. Why?
Android has ListView component which is quite nice. The problem is that I created my own adapter to supply viewitems for each item displayed and I don't get anymore: Background color change when i scroll the items using up/down arrows. Background color change when I select an item. How do I do that?
View 1 Replies View RelatedI get my Models in a nice object-oriented form. In order to bind them to my List, I have to use the listAdapter. Can I only fill this listAdapter with stupid ArrayLists? Because that means, I have to iterate over my ModelCollection and pull all the data out of my Models again. So, I detach my data from the models and I cant easily refresh the data in my listView, if something chances in the modelCollection (like becoming bigger through new Items / pagination). Does a more intelligent way exist, than I use right now? Can I bind my ModelCollection more driectly to the listView?
ModelCollection modelCollection = ModelCategory.findAll();
/*
* Prepare Data for Adapter
*/
ArrayList<String> itemTitles = new ArrayList<String>();
// Iterate over my ModelCollection and pull all the Data from each Model
for (int i = 0; i < modelCollection.items.size(); i++) {....................
I am trying to record the selection made by the user in the array. But when I run the app, it crashes the moment I click something.
CODE:......................
I am writing a adapter for a specific app, the problem I met is:
I have only 1 listview in main.xml, and the row style is defined in file_row.xml. If I simply use list.setAdapter(new ArrayAdapter<String>(this, R.layout.file_row, R.id.file_name, items)); where items is a ArrayList<String>, everything works well.
But if I use my custom Adapter, say, list.setAdapter(new MyOwnListAdapter(this, filename)); and in the class of MyOwnListAdapter, the code has been simplified as
CODE:................
But I always met the problem which is:
CODE:.........
I thought the self-defined Adapter class actually has only one line of valid execution, which is super(context, R.layout.file_row, R.id.file_name, filename_list); It's essentially identical to direct calling of list.setAdapter(new ArrayAdapter<String>(this, R.layout.file_row, R.id.file_name, items)); Then why I always got this error if I call my own Adapter?
When I try to set the Alert using ArrayAdaptor to display a set of items, the list is displayed but the items' characters are invisible. If the item is selected, then the characters are visible. Scratching
my head on why. Appreciate any advice.
Below is the code and the screenshot from the emulator.
CODE:.............
Data being pulled from a local DB, then mapped using a cursor. Custom Adapter displays data similar to a ListView. As items are added/deleted from the DB, the adapter is supposed to refresh. The solution attempted below crashes the application at launch.
CODE:................
Errors:
CODE:.........................
CODE:......
When i select an item random other items background also gets changed although they are not added to the array names and numbers. i need only the background of the selected item tochange..is there a way to do this without creating my own listadapter ?
I need to load Contacts.Phones.CONTENT_URI and Contacts.ContactMethods.CONTENT_EMAIL_URI into a ListActivity.
Since these are separate Content URIs, I have two separate cursors and can't construct a SimpleCursorAdapter for use in the ListActivity.
The problem is that I have more than a thousand records for CONTENT_EMAIL_URI, which were automatically loaded by GMail. The app becomes unresponsive and Android prompts to kill the app or wait.
Is there a way to make the ListActivity content load in the background, like, by writing a custom implementation of android.widget.Adapter?
Or is it more feasible to use a single cursor, by manually running the SQL query on the contacts tables?
I have a listview and i inflate the first position with a layout and every other position i do
another inflation with another layout.
I can do that by checking every time in getView, but as you can imagine this is not very efficient.
Can you share me your thoughts to get that result by having this pattern? (This don't get me the correct result(cause after 4-5 positions, depending of the number of positions inflated the first time, i get the layout.inside_list_2 on other positions too.)
CODE:.....................
I made an application that uses a ListAdapter to display some items. In my getView method I use LinearLayout#setPadding() to define the indention of each view depending of some object specific states.
This worked fine in Android 1.5. Last week I decided to move to 1.6 since it's better suitable for different screen sizes. It all worked fine, but the ListAdapter looks really weird now. The padding isn't working correctly anymore.
Does anybody know if there is a difference in the ListAdapter or setPadding implementation between Android 1.5 and Android 1.6?
Code added:
CODE:.............
Screenshot added:
I know that this elements of the list are all level 0 elements and should therefore have no padding (I used logcat to verify the level of the elements. they are all 0). the level of the elements i use in the switch case to check the padding (see code)
today i meet the problem.i need technic can control the android machine from server.then i want send data from server to android with no request from android.
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