Android :: Bind Data To ListView Without Preparing ArrayLists For ListAdapter?
Sep 14, 2010
I 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++) {....................
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May 25, 2010
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.
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Mar 19, 2010
I have a problem with adding new items to ListView.
I use custom adapter MyListAdapter. I do that way:
CODE:...................
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Feb 23, 2010
I've got a class called PhoneContact with 3 properties:
Title, Description and PhoneNumber
If I have a collection of these, how would I go about binding these to a ListView containing a TextView for each property?
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Oct 13, 2010
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?
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Mar 11, 2010
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?
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Jun 22, 2010
public class List_View extends ListActivity {I would like to show stored data from database into a ListView. Code... Title and Date only.
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Mar 7, 2010
How can I bind my application so, when the Birthday entry is clicked on a Contact Entry, it will open up my activity?
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Jul 2, 2010
I have multiple ArrayLists built from parsed XML that are directly related to each other in order. The arrays are later put into a single mapped ArrayList (groupData) to be read with a SimpleAdapter which creates the list in the Android GUI.
What I want to do is sort the list in alphabetical order based on one array (arr_title) and the other arrays stay in synchronized order to it. It doesn't matter where the sorting happens as long as the final displayed list is sorted. I expect it would be best to sort the mapped array once it's built. The simpler or easier to understand the code the better, but don't want the sorting to go very slow either. I have about 140 objects per array, but that could expand considering the XML is pulled from the web.
I've spent hours searching Google and tried a number of things with little progress. Collections.sort(arr_title) will sort the one array as I want it, but then the other arrays don't match up and doing the same thing to the other arrays obviously just sorts them individually as I don't want. I've noticed mention of using the TreeMap type and Comparator for similar sorting, but couldn't figure out how to use them in this case probably because the examples didn't provide a big enough picture for me to understand.
The sample below is where most of the stuff happens after the separate arrays are created.
CODE:............
SimpleAdapter adapter = new SimpleAdapter(this, groupData, android.R.layout.simple_list_item_2, new String[] {"title", "desc", "num"}, new int[]{android.R.id.text1, android.R.id.text2});
setListAdapter(adapter);
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Nov 24, 2010
My ListView has to be customized like, it should have three imageView in each ListItem along with the name and date that has to populated from the DB,added with that, once i click upon the a list item ,that corresponding Listitem information has to be displayed in another Screen...The Size of the List should be based on the Cursor object from DB..and it should be possible to add data in to the Listview..too. how to proceed the above said..Please check the ScreenShot of ListView that i mentioned..(My ListView should have to be like this only)..[SampleListView Below- please click that link][1] http://imgur.com/RjtXe.jpg.
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Jul 23, 2010
Here is my Arrival.Java. May i know why isn't there any data being shown on my ListView?
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Jul 6, 2010
I have a problem with listView, I used ArrayList to store data, and a customized Adapter. But, when I remove all the data, and add one item again, it does not display anything in this list. What happens to my List, can anyone help me?
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Sep 7, 2010
Since I got my 16 GB Card it's started saying it for longer than with my 2GB Card, however it says it less now. Does how long it takes depend on how much data you put on since taking it out of USB Mode? Because when I first got this card I wrote a lot to it (Moving all my files over), but now I just put a few files here and there on... Is there a way to disable this and let you run it manually at your leisure?
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Jun 25, 2010
I have a ListView which its contents could change at any time (eg. a list of cities within a state; a new city could be added to the state in our database at anytime). How do I implement, if possible, the onListItemClick event to work with this? For example, if a user selects a certain city in the ListView, i should be able to pass a value that independently identifies what city was clicked onto my next activity. I can't listen for positions because they could change with an addition or removal of a city.
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Mar 31, 2010
Does someone know how to get a 'flat' map / list of the contacts and there phone numbers. I am currently using this to build a datastructure, so I can display it in a lIstView, which is not really fast. The code shows that I do two queries. Would it be possible to do this with one query so that I end up with a just one cursor. The structure ideally would be: contact name number number contact name number
This would then allow me with a custom listView Adapter to display the data and make the names non clickable.................
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Oct 20, 2009
I'd like to map an Array of "complex" data to a ListView. In a very simplified form my data model would look like something like this:
Code...
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Aug 17, 2009
I currently building an android apps that retrieve data from a distant Web service and I search an efficient way to bind data form XML to ListView. I already use CursorAdapter and i search on the web for an "XmlAdapter". I read on Google IO topic "Coding for Life - Battery Life, That Is" (http://code.google.com/events/io/sessions/ CodingLifeBatteryLife.html) that is more efficient to use "stream parser" instead of "tree parser" but I don't find the way to build a class that implement ListAdapter because of stream parser can't navigate backward so I don't understand how implement method that use "position" parameter (How retrieve data before current XML Parser position?).
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Jul 26, 2010
With the below code, nothing appears in the ListActivity as I would expect.
No errors are shown in logcat.
CODE:..............
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Sep 7, 2010
How to get data from SQLite which contains some data. How to place it(the data) in the listview.
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Sep 30, 2010
I'm having my first stumbling steps with android and are trying to modify an existing notepad example from Android dev. I have a database with an existing column named CREATED_DATE (of the note) but the data for that column is presented as System.currentTimeMillis(). This is all good and probably in line with conventions since it's created by the developers.
But my problem is that I want to present the date in a ListView using the format "30 sep". My problem, how do I convert the data to that format before presenting it in the ListView? Right now I'm using this kind of adapter:
CODE:...........
Now, I've figured out how to convert currentTimeMillis() to todays date but how can I convert the data coming from the cursor before I toss it into the adapter?
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Jun 22, 2010
package one.two;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.database.Cursor;
import android.inputmethodservice.Keyboard.Row;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView; Code...
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Aug 10, 2010
I must be missing something simple here.I've searched around but don't think my search query is touching on the right topics to yield results. Anyhow, what I'm after is running through the array of data I bind to a ListView after a "Submit" button has been clicked.
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Dec 27, 2009
How do you make those standard header labels in the ListView Control?
An example would be in the contacts application you see the first letter of the grouped contacts for each letter in the alphabet.
If possible provide some code snippets on how to construct the grouped data and the display of the ListView.
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Oct 12, 2010
I'm pretty new to java programming and am looking to do basic data mappings.What I want to happen is when you click an item it goes to it's subcategory.I'm not worried about switching the data when an item is clicked. I'm just not sure how to create the data set in an efficient way using Android.Eventually this will be driven by a database but I want to figure out how to use mock-data to get this working first.I'd like to be able to access it like myData['category2'] or myData['category2']['subcategory3']Should I create this in xml files and link them up or is it best to create a new class structure for it?
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Oct 1, 2009
I'm trying to bind data from my SQLiteDatabase to a ListView. I'm currently using a SimpleCursorAdapter to fill in my ListView. Unfortunately this doesn't seem to work with setting a CheckBox's checked attribute. This is how I do it now; instead of changing the CheckBox's checked status the adapter is filling in the value to the text argument, so the value is displayed right of the CheckBox as text.
Java:
setListAdapter( new SimpleCursorAdapter( this, R.layout.mylist, data,
new String[] { Datenbank.DB_STATE, Datenbank.DB_NAME }, new int[] { R.id.list_checkbox, R.id.list_text } ) );
mylist.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<CheckBox android:text="" android:id="@+id/list_checkbox"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:checked="false" > </CheckBox>
<TextView android:text="" android:id="@+id/list_text" android:layout_width="wrap_content"
android:layout_height="wrap_content" > </TextView> </LinearLayout>
The field in the database is of course of type boolean and I've also tried to assign an id to the checked field to fill the value in.
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Feb 9, 2010
I read a tutorial, and it uses SQLlite and "SimpleCursorAdapter" to fill the list with items. This is the code...
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Nov 21, 2010
I have a list view that can display items based on internal state (it has items, and 'viewed' items). i need to be able to toggle between the two states, i do that using a simple button that change the adapter's state and the adapter then called notifyDatasetChanged(). My data DOES gets updated, however i was facing two problems:
if in the previous mode the list was partially scrolled, it stayed in that state after i changed the data set (if i was half the way down i'll be half way down in the new data set as well, this is not the behavior i want, but i cols not find a way to scroll the list manually to position 0. any ideas?
(setSelected is not exactly a solution since i DON'T want any selection i want to stay in touch mode) In my list View each item has an image that is fetched from the net, as so it's being brought using my networking manager and i send the image request ONLY if i'm in this screen for the first time OR if scroll state is idlle, i didn't want to start loading images from the getView method since if i fling the screen it may load a lot of unnecessary images. However when calling notifyDatasetChanged() the scroll listener methods are not called. i solved this one by using notifyDatasetInvalidated even though my data is not empty, is there a better way to solve this issue ?
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Aug 26, 2010
I have an activity with multiple list views that are continuously receiving new values form a socket thread, another thread parses the data and updates the array adapters, then the ui thread calls notifyDataSetChanged() to cause the list to refresh.
My issue is that im refreshing all the list a couple of time a second, this causes the UI to be very laggy when some animations need to happen.
I was wondering what the best way is to update multiple lists with multiple value changes every second?
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Mar 16, 2009
I like that my GUI appears immediatly when the User starts the APP. Than some Data (text, Pictures) come loaded in the Background (like Youtube APP) The Listview and Gallery comes updated automaticly with this new Data.
I initiate my Listview, start a Thread and load the Data....and than the Listview does not come updated!!
Several People write I should use notifyDataSetChanged(). But I can not place this Command in my Thread (just unknown).
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Nov 21, 2010
I have a list view that can display items based on internal state (it has items, and 'viewed' items). i need to be able to toggle between by two states, i do that using a simple button that change the adapter's state and the adapter then called notifyDatasetChanged(). My data DOES gets updated,
However i was facing two problems:
1. if in the previous mode the list was partially scrolled, it stayed in that state after i changed the data set (if i was half the way down i'll be half way down in the new data set as well, this is not the behavior i want, but i cols not find a way to scroll the list manually to position 0. any ideas ?
2. In my list View each item has an image that is fetched from the net, as so it's being brought using my networking manager and i send the image request ONLY if i'm in this screen for the first time OR if scroll state is idlle, i didn't want to start loading images from the getView method since if i fling the screen it may load a lot of unnecessary images. However when calling notifyDatasetChanged() the scroll listener methods are not called. i solved this one by using notifyDatasetInvalidated even though my data is not empty, is there a better way to solve this issue ?
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