Android : How To Update A ListView In Tab?
Nov 5, 2009
I saw Mark M. example (http://www.androidguys.com/2008/07/28/fancy- listviews-part-five/ ) and test it. This is really good. But i have one problem: After i start the app, i want to see my GUI (one Tab content is a ListView, the second and last Tab is a MapView). In a background thread, i want (and i can) load the data for the listView. So i first create the Tab with the ListView without any content (my string array is empty: String [] array = {""}; ). Now if the background thread is ready and the array-String has get the data, i want to update the ListView in my tab. I try: my_adapter.notifyDataSetChanged(); but without success. What must i do, that the ListView gets updated.
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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 18, 2010
I have a listview of items (songs on the sd card). The user has an option to load all the songs on the sd card to into a current playlist -- those songs are what is displayed in the listview. Because this can take few seconds to load if they have a lot of songs on the card, I want to display a progress dialog to just tell the user "One moment..." until the list refresh is done.
I launch a thread to do this. I've done this successfully on another app I have (which just updates a database in the background but doesn't update any display), but this one fails with this error message, "Can't create handler inside thread that has not called Looper.prepare()". I chopped down the activity and pasted it below. What am I doing wrong here? I have just a vague idea of what might be happening.
By the way, everything works when I take out the threaded stuff, it just looks like the app freezes for a couple seconds.
code:..............
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Feb 4, 2010
I never got this working in a straightforward manner. Sorry if I'm being a little vague. I'll try to elaborate on what I'm trying to do. I am trying to build a listview that grabs its data from a webservice. Once I initialize a listview, I want to keep polling the webserver periodically and update the contents of the listview. For this I am doing something like this:
public class SampleAutoUpdateList extends Activity {
//Autoupdate handler
private Handler handler = new Handler();
private Runnable updater = new Runnable() {
public void run() {
/*
* Update the list
*/..................................
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Aug 30, 2010
CODE:........
My array clearly has been updated, and I can see the change when my app starts, but why doesn't it update in this method? The code enters this method.
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Aug 28, 2010
I have list of items ion my activity which I load dynamically, item after item. Initially I load "lightweight" version and when processing is done I want to update the item with new information. Like set some text or replace an image. That means I need to update what ListView item is displaying after Adapter#getView already returns. Of course I don't know if user is actively scrolling and this item is still visible or has been scrolled out ot view. The only thing I can think of is to extend View so it performs some operations on it's own thread and updates itself when done,but will it work?
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Jan 19, 2010
How do I update individual row in listview?
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May 3, 2010
I am trying to get this code to run, but I get an IllegalStateException when I run this code saying that the content of the listview wasn't notified, yet I have a notification upon updating the data. This is a custom listview adapter.
Here is the relevant part of my code:
CODE:...........................
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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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Aug 16, 2010
I have a ListView backed by a custom adapter based on a CursorAdapter.The cursor I give it is based on a list of Notes in the database (each note is a DB row).Everything works just fine until I delete a note from the database. I'm not sure how to properly update the cursor/adapter/listview to display the new data.I've read conflicting posts on using adapter.notifyDataSetChanged() vs cursor.requery() to refresh the UI, but neither of them seems to work in this case.The only way I've been able to refresh it is by creating a new cursor from a new query and calling adapter.changeCursor(newCursor).Could someone demonstrate the proper way to update the backing data and then the UI (with psuedocode if possible).
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Aug 8, 2012
I am at my wits end with this android app I'm making. Basically, it populates a listview, each row containing 3 values that will be updated at a specified interval. The values are blank on startup but are initialised after the first run through the code.
However, every other time the listview wont rewrite itself! Logcat tells me the updated values are being passed in but the adapter won't update.
Code:
adapter = new snmpAdapterView(this, parsedObjects);
setListAdapter(adapter);[code].....
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Oct 26, 2009
In my ListView, I choose an Item to "Add Favorite" and I have to do some stuff work, I fill data again to refresh the List, then I implement OnScrollListener use setSelection(firstVisibleItem) to set List display right on Item was added. Are there any better way to do that. I mean like mCursor.requery() or something like that in android APIs ? Or any suggest way?
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May 27, 2010
I have a separate thread running to get data from the internet. After that, I would like to update the ListView in the main thread by calling adapter.notifyDataSetChanged(). But it does not work. Any workaround for that?
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Jun 26, 2010
I would like to change text and back ground color of my Listview without building custom rows. Is this possible ?
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Jun 24, 2009
There must be a way to do this. How can you tell a ListView that has a header to not scroll it when the user scrolls the contents? I want it to stay in a "stuck" position so that the user can always see what column the content applies to.
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May 15, 2010
I have ListViewActivity
public class SelectActivity extends ListActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_one_of);
SimpleAdapter adapter = new SimpleAdapter(
this,
createChildList(),
R.layout.select_one_of_childrow,
new String[] { KEY_VALUE },
new int[] { R.id.selectoneof_add_new_item});
setListAdapter(adapter);
}
// ...
}
after setListAdapter() calls I would like to execute the following code:
((TextView) getListView().getChildAt(0).findViewById(R.id.selectoneof_add_new_item)).setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ticked, 0); but getListView().getChildAt(xxx) returns null and I catch NullPointerException. Where should I put mentioned above code-snippet?
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Sep 9, 2010
In my project i m parsing xml and i want to put it in xml list with in list.
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Nov 23, 2010
I just upgraded my xperia to android 2.1 and immediatley after that my phone keeps on restarting. is this normal? or should i reinstall the update again?
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Apr 4, 2012
I have some class LoginActivity.java. In the onCreate method I retrieve ListView:
ListView list = (ListView)findViewById(R.id.snListView); then:
list.setAdapter(adapter);
In addition there are login.xml layout - there are:
<ListView
android:id="@+id/snListView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
and sn_row.xml:
[Code]...
At the moment I have cell's height 100dp, I need that cell's height will depend on device, I mean I have here 5 cells showing at login screen in ListView and I need that these 5 rows will fit the ListView (cell's height = ListView's height/5).
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Sep 21, 2010
I would like to update my sql lite database with the native update-method of the SQLiteDatabase class of android.
CODE:.......
But i get following error:
CODE:....
I donīt know what should be the problem. Somehow the values do not arrive in the sql statement. I did nearly the same with the insert method and that worked quite fine.
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Nov 23, 2010
After I updated to 2.1 i cant see the phonebook any longer in my car (BMW 1 serie with IDRIVE and bluetooth). With 1.6 I could chose a contact and then dial directly, or import the phone number (however it was not as great as the old symbian OS where you even could navigate directly to a contact). Is it someone that has any idea of a good app or something that makes this possible (maybe a Symbian simulator :-)).
I have also realized that the connection (dB) has decreased with the new OS. I even loos connection on the E4, with this phone (Xperia X10 mini Pro).
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Jan 8, 2010
Just got a new Android phone, my second after a brief stint with the G1 a year or so ago..
Today I noticed that I received notifications that I have apps with updates available. When I click on the notification it takes me to my downloads in the Marketplace, but it doesn't show me which app has an update. They all just say Installed.
Is there no way to tell what application needs updating?
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Nov 19, 2010
I'm not sure if this has been discussed already but can someone please tell me if Android 2.1 OS for SE x10 is available in South Africa?I'm wanting to purchase this phone but I'm hesitant as I'm not sure if this update is available.
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Nov 12, 2010
After installing the 2.1 update onto a SE X10 mini the Android Market will not function. It opens, I can browse and select apps but when attempting to download it states 'starting Download', with a barber-pole bar, but the download goes no further. I have re-installed the update which seemed to work at first with one download working but then the same problem re-occurred. Based on info in other feedback on this blog I reviewed the app settings but there is no update to uninstall. how to get the Market to work?
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Oct 30, 2010
I need to update my ui for an android app and I'm trying to use the Handler class to do it, using http://developer.android.com/resources/articles/timed-ui-updates.html and the android developer resources "Common Task" for using Handlers as guides.
Basically, I need something between the two - a timed update of the user interface, but without a button. So here is the relevent code that I am working on.
CODE:...................
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Sep 26, 2010
I have a listview within an activity and at the bottom of the screen I have a scrollable gallery, my problem is making the listview clickable, I would normally use the listview position by doing if(position == 3) and then create the intent but postion is being used by my gallery. I listview is in the main.xml populated by an array.xml, can I add an id i.e android:id in the arrays.xml and create an intent with that, or can I create a listactivity and still use position to fire an intent if so how would I do this.
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Mar 16, 2010
I am very new to Android, but I love it because it has given me back what i was longing for : Java.
but I am facing some doubts and confusions about is, since I am totally new to Mobile App Development:-
I am listing my queries here-
1.) I wish to put various items in a single element of a ListView. Like one image in the left, so many TextViews in a single element, and more things. Is it possible?
2.) I wish to give my text different colors, different sizes, and different fonts. how to do this?
3.) I wish to insert or delete elements from a List in ListView. How to do that?
4.) I wish to change the background color of my list. how to do this?
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Sep 11, 2010
i can add to a db and list as a listview. When I click a list item using onListItemClick, what statement do I need to get the value? ........................
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Aug 1, 2009
I am beginer to the anroid ,i am using the below code for displaying listview and i am not able to getting the onlistitemclick events for further ui's. package com.List;
import android.app.Activity; import android.app.AlertDialog; import android.app.ListActivity; import android.content.ContentUris; import android.content.DialogInterface; import android.content.Intent; import android.content.DialogInterface.OnClickListener; import android.database.Cursor; import android.database.DataSetObserver; import android.os.Bundle; import android.provider.Contacts.People; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import............................
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Sep 13, 2010
i want to implement listview with uses different xml layouts for rows depending on underlying item. A non optimal solution will be int getView method just to inflate every time a new view depending on the item from the adapter. Is there a better way to do this?
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