Android :: Listviews Dynamically Update UI Output When Database It's Binded To Changes?
Dec 1, 2009
I have a database that gets updated by a background thread. Is is possible for the UI ouput(using a listview) to change when a database entry is added/deleted? I've seen examples of using SimpleCursorAdapter and listViewAdapters and I'm not sure which to use and if it would even work.
I found an "efficient" listViewAdapter which would work great for me since it doesn't call findViewById often and I can change the data structure to hold exactly what I need, but I don't know how to hook it into my database adapter so it dynamically updates the output when there is a database change. Example: http://www.androidsnippets.org/snippets/125/
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Mar 31, 2010
I want to know how to change dynamically a ListView's item layout. To be exact, i want to know the method that the ListView's bindView method is called at runtime. if the bindView method is artificially called by a other method. then i will change a ListView's item layout.
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Nov 7, 2010
I am not very familiar with android coding so try to help me on a easy way.
The problem:
I have 2 Listviews and a onClick event handler.
How can i find out on which listview the user currently clicked?
public void onListItemClick(ListView l, View v, int position, long id) {
'Approach: if listview1 is clicked then FUNCTION1() else FUNCTION2()'}
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Jun 30, 2010
I am new to android application development.I have create registration form with user name,password, email. this values should be stored in sqlite database table. retrieve the data from the table. in login.java i have create the table and insert the values of registration form data in to the table dynamically. In databsehelper.java extends the databaseopenHelper class overwrite the oncreate and upgrade methods.this class i used this class in login.java. In display.java i am going to display the data in on success register details. there are no errors but it gives the error on the emulator unexpectedly stoped...................
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Aug 24, 2009
I successfully binded a spinner widget to a simple cursor adapter, but I started having problems when I tried to add a new item to the table which feeds the spinner by clicking an "add new item" button. The idea was to launch a new activity which returns the rowid of the just added element, and use it to set the new position.
What I basically did is to implement something like:
break; in the "onActivityResult" method, the rowid has the correct value but setSelection has no effect. I also tried to force the argument to some other values, but still with no result. If I call it in the onCreate method, it works beautifully. Moreover, I am still not sure that setSelection is the right method to call, since its arg is named "position" in the doc, while I am passing an "id".
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Feb 6, 2014
I want to output Android's camera output to a PC through Wifi or Internet.
I cant find a suitable app for the purpose. I did try to find one.
Closest I came to was MirrorOp Sender, but it shares screen?
I have a Galaxy S3 I9300 and a Galaxy Mini S5570
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May 28, 2010
I am currently learning about widgets in Android. I want to create a WIFI widget that will display the SSID, the RSSI (Signal) level. But I also want to be able to send it data from a service I am running that calculates the Quality of Sound over wifi. Here is what I have after some reading and a quick tutorial: public class WlanWidget extends AppWidget Provider {RemoteViews remoteViews; AppWidgetManager appWidgetManager; Component Name thisWidget; WifiManager wifiManager; public void onUpdate(Context context, AppWidgetManager appWidget Manager, int[] appWidgetIds) { timer timer = new Timer(); timer.schedule AtFixed Rate(new WlanTimer(context, appWidgetManager), 1, 10000); The above seems to work ok, it updates the SSID on the widget every 10 seconds. However what is the most efficent way to get the information from my service that will be already running to update periodically on my widget? Also is there a better approach to updating the the widget rather than using a timer and timertask?
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Feb 22, 2012
I need to show the output on the screen from my if statement. I need something to put instead of system.out.println("This") - I know this shows it on the log. I want to show on the screen.
Code:
try
{ PleaseEnter=(EditText)findViewById(R.id.PleaseEnter);
{
[Code].....
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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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Jul 22, 2009
i am using TableLayout and i am adding row dynamically. when the all the row is created after that i want to update that row one by one mean i want to add image in that row but problem is what i am not getting any row id or any reference of specific row due to this i unable to update the row
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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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May 28, 2010
I am currently learning about widgets in Android.I want to create a WIFI widget that will display the SSID, the RSSI (Signal) level.But I also want to be able to send it data from a service I am running that calculates the Quality of Sound over wifi.Here is what I have after some reading and a quick tutorial:public class WlanWidget extends AppWidgetProvider{
RemoteViews remoteViews;
AppWidgetManager appWidgetManager;
ComponentName thisWidget;
WifiManager wifiManager;
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Timer timer = new Timer();
timer.scheduleAtFixedRate(new WlanTimer(context, appWidgetManager), 1, 10000);
private class WlanTimer extends TimerTask{
remoteViews remoteViews;
AppWidgetManager appWidgetManager;
ComponentName thisWidget;
public WlanTimer(Context context, AppWidgetManager appWidgetManager) {
this.appWidgetManager = appWidgetManager;
remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);
thisWidget = new ComponentName(context, WlanWidget.class);
wifiManager = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
@Override
public void run() {
remoteViews.setTextViewText(R.id.widget_textview,
wifiManager.getConnectionInfo().getSSID());
appWidgetManager.updateAppWidget(thisWidget, remoteViews);
}The above seems to work ok, it updates the SSID on the widget every 10 seconds.However what is the most efficent way to get the information from my service that will be already running to update periodically on my widget?Also is there a better approach to updating the the widget rather than using a timer and timertask? (Avoid polling)UPDATE As per Karan's suggestion I have added the following code in my Service: RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget);
ComponentName thisWidget = new ComponentName( context, WlanWidget.class );
remoteViews.setTextViewText(R.id.widget_QCLevel, " " + qcPercentage);
AppWidgetManager.getInstance( context ).updateAppWidget( thisWidget, remoteViews );This gets run everytime the RSSI level changes but it still never updates the TextView on my widget, any ideas why?
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Mar 18, 2009
I have table with 3 columns which is binded to an XML document with three text views.
CODE:........
Depending on the value store in the third column, I want to change the text color in R.id.c. How should, I go about with this.
This is what I have so far :
COD:...............
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Jul 30, 2010
Just letting you guys know that I updated the phone and now the tv screen stays blank. This didn't happen prior to the update. Anyone else having the same problem?
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Jan 25, 2010
Is possible update the records from SQLite from my Android Application1 from other Application2 Android
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Feb 25, 2010
I've got a question about updating an app after release. If I have a database that contains 10 columns and I add a feature that requires an 11th column after the app has been released, where would I put the sql code to add the new column so that when they install the app it keeps their current data, but adds that 11th column? Is that even possible or would I need to create another table that references the first with a foreign key?
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Jan 4, 2010
I update a value in my Database in a Listview using a Context Menu. The code so far seems to be ok. But everything i try to make the update visible in the View failed. Anyone can point me whats wrong there ? I use a ViewBinder to map the Layout for each row.Code...
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Nov 3, 2010
Good morning everyone, I am new to programming with Java and Android, I'm trying to make an application to seek an xml in a web address and contains information that should be saved in my sql lite ... The doubt is as follows: I have to download and save the xml file on the device or can just work with it in memory, example: xml = xml.create (www.meusite.com.br / meuxml.xml); how would you do?
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Mar 27, 2010
I have a main application, and a bunch of sub-applications (they are separate apps, which do not appear on the android home dashboard). I was planning on having a SQLite DB which the main app maintains, and get a list of available sub-apps from. Is there a way to update this main database as the user installs the sub-apps?
Two alternative I was thinking of include:
User installs the sub-apps via the main app, which would then update the DB.
Rather than use the DB to find all installed sub-apps, have each sub-app declare a category, and use intents to query for all applications which match that query (is this even possible?
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Nov 5, 2010
I don't exactly know how android updates the applications. As far as I've read around here it keeps the SQLite database. So, imagine this scenario: one application that uses SQLite database for persisting data. After a while I release v2 which contains some database changes and I need to update user data in database. How can I make this during the update process ?
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Sep 20, 2010
I am implementing an android application and i can't figure out how to solve this problem : When user clicks to the update button , i want to connect to the my server and check if there is any update on the data , if there is , i want to get data from server and update the database.Should i use xml structure to check and get updates from server or is there any smarter ways to achieve this ?
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Aug 4, 2010
I have an app which uses a large amount of data which has been compiled outside the app (on my main PC). The app is for my personal use so there are no complications with having to distribute data updates to other users. However, I am currently following a very convoluted and time-consuming procedure each time I want to update the data, and I wonder if anyone can suggest any ways to streamline it.
The procedure I follow whenever I want to add new data is as follows:
I enter the new data into a csv file which I maintain as the source of the relevant table in the database. I use SQLite Database Browser to import the data into an existing SQLite database. (This program does not seem to have the ability to append imported data into an existing table, so whenever a table needs updating I have to delete the existing table, then import data from the csv file into a new table, then manually edit the data types for all the fields in the table.)
I drag the icon for the database file onto the 'assets' folder of my project in Eclipse. I export the project from Eclipse as an apk file. I copy the apk file to my phone (using Astro File Manager) I uninstall the old version of the app and install the new apk.
when the app is run, code based on the example set out here copies the data from the 'assets' folder into the app's data folder; this means that each byte of data takes up two bytes in the phone's internal memory; at present this is not a problem, but could be as the volume of data grows; I wonder if there is a more memory-efficient method?
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Sep 20, 2010
I currently facing problem where user have the choice to enter several working experience, where every working experience include several details (company name, duration, roles etc) I don't know how should I store it since users have the freedom to add as many working experience as they have.I have a table as below
private static final String DATABASE_CREATE_WORKEXP =
"create table workexp (work_id integer primary key, _id integer not null," +
"workcompany text, workduration text, workrole text, workskills text" +
"workproject text, worksalary integer, workreason text," +
"foreign key(_id) references user(_id));";
I have a problem while trying to insert / update and delete entries as company name can be duplicated. Any advice or suggestion? I'm glad to provide more info for you to help me.
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Aug 22, 2010
I will like to know if we can continuously call some service for fetching results and displaying in Autocomplete list.I have one screen with the text box and when user starts entering in that textbox the autocomplete should get filled with the data. The data will not be hardcoded and will be fetched through http connection.I think I need to call http connection in onTextChanged method of Edittext but is that the perfect solution.Moreover, should this type of implementation done in mobile application. Since, this feature is web based. Can this be done in mobile application too?
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Sep 7, 2010
I have a ListView, and within each list item I have some TextViews and a CheckBox. When I check a CheckBox and my onCheckedChangeListener fires, everything works as it should. However, random other checkboxes get checked once one is checked. Here is an example.
If I click on the first CheckBox:
8 is checked.
15 is checked.
21 is checked.
27 is checked.
33 is checked.
41 is checked.
Then if I scroll all the way up, none are checked until 6. The next being 13.
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Apr 25, 2010
I'm trying to figure out how it's been designed. How it holds its items? How do I get a hold of the scrolling container? How can I know it's exact scrolling position? How can I scroll it to an exact position?
I want to have all the current benefits the ListView provides plus detailed scrolling control... How about animating from x to x+100 scroll position?
Maybe I need to create my own ListView? Where do I begin?
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Nov 18, 2009
Firstly, I have found many examples of how to grab data from a db and place it into a list, however this seems to be all for ListActivites.
My list is part of the UI and therefore I can't use a ListActivity because it does not consume the whole screen (or can I?).
This is the UI:
CODE:........
So, from what ive read I need to grab the data from the db, then place it into some sort of array then use an array adapter to fill the list view. Is that correct? If so, is there some sample code because all I can find is code releated to ListActivites.
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May 15, 2010
I am writing a software that i have to drill down on content a lot. For example when the program starts a listview is displayed. When user clicks on an item, then a second listview must be displayed. For example:
Select Continent > Select Country > Select State > Select City > Select Address
What is the best way to do this (less memory, faster, easier to code etc)? To create multiple listviews with multiple adapters? Or 1 listview with multiple Adapters? Lists are loaded from an external XML File.
So far i am creating a new adapter and setting it to the listview. How do i create a second listview and after clicking on 1st listview displaying the second one, with animation. Any examples? Extend my class to ListActivity or Activity?
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Aug 13, 2010
Hello, I need to put several listviews inner a LinearLayout. The Listviews should be wrap content to adapt the listview to their items. I need have one only scroll with which I can scroll all the listviews. I know that i can't use a scrollview because the listviews have their own scroll (but i don't need the scrolls of the listviews because i have them in wrap-content). I thought maybe puting the listviews inside the LinearLayout I will hadn't problems with the scrollview, but it didn't work, the LinearLayout was fixed to the screen, the scrollview didn't appear and the listviews ended scrollable. Without the scrollview if i have the list in wrap-content, their shown properly but i haven't any scroll and i can't see the lisviews below the screen. Really i have had this bug for one month and i haven't found any solution,
My code:
CODE:............
JAVA
CODE:...............
How you can see i create the lisviews dinamically and i put indside the layout with a secttion header. if you have some doubt ask me I need find a solution soon.
Sample Image: http://www.freeimagehosting.net/image.php?6dea1468bd.png
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Oct 11, 2010
I wish to work with checked list views wherein only one item can be selected at a time. Some queries related to this:
1) Is it advised to work with CheckedTextView as the ListView items, or a combination of CheckBox and TextView?
2) If using CheckedTextView, the text comes first and the checkbox appears on right edge. Is it possible to make the checkbox come on the left of the TextView?
3) How can I make one of the items as checked in onCreate()?
I am using array adapter and calling setAdapter() to populate list.
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