Android :: What Is Standard Way Of Keeping List Updated With Database

Aug 23, 2010

I have a database, a ListView, and a CustomCursorAdapter that extends CursorAdapter. A menu button adds an item to the database. I want the ListView to update and show this change. Normally it doesn't show this new item until i go to the homescreen and reopen the application.

I did eventually get it to work by calling cursor.requery() or mCustomCursorAdapter.changeCursor(newCursor) whenever I added a new item, but when I set autoRequery to false in the CursorAdapter constructor, it worked just the same. Why does it update correctly when autoRequery is set to false?

Am I using CursorAdapter correctly? What is the standard way of keeping the list updated with the database? And what does autoRequery do?

Android :: What is standard way of keeping list updated with database


Android :: Changing Package Name But Keeping Database

Sep 7, 2010

I've created an Android application which has a certain package name that I've been using personally for months now. I'm about to release it on the market, and I have to change the package name. This cannot be avoided.

My issue is that the application has an SQLite database attached to it that I want to keep, but I know if I change the package name, it'll install as a separate application and I'll have to restart my database, which would take a very long time.

Is there a good way to change a package name while maintaining the SQLite database? Or at least moving the database easily? This will just be for my own phone since it hasn't been released to the public yet.

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Android :: Keeping Data In Memory And Database At Same Time

Sep 9, 2010

We're designing an Android app that has a lot of data ("customers", "products", "orders"...), and we don't want to query sqlite every time we need some record. We wanna avoid to query database as most as we can, so we decided to keep certain data allways in memory.

Our initial idea is to create 2 simple classes:

"MemoryRecord": a class that will contain basically an array of objects (string/int/double/datetime/etc...), that are the data from a table record, and all methods to get those data in/out from this array.
"MemoryTable": a class that will contain basically a Map of [Key,MemoryRecord] and all methods to manipulate this Map and insert/update/delete record into/from database.

Those classes will be derived to every kind of table we have in database. Of course that there are other usefull methods not listed above, but they are not important at this point.

So, when starting app, we will load those tables from SQLite database to memory using those classes, and every time we need to change some data, we will change in memory and post it into database right after.

But, we want some help/advice from you. Can you suggest something more simple or efficient to implement such thing? Or maybe some existing classes that already do it for us?

Update:

I understand what you guys are trying to show me, and I thank you for that.

But, let's say we have a table with 2000 records, and I will to list those records. For each one, I have to query other 30 tables (some of them with 1000 records, others with 10 records) to add additional info in the list, and this while it's "flying" (and as you know , we must be very fast at this momment).

Now you'll gonna say: "just build your main query with all those 'joins', and bring all you need in one step. SQLite can be very fast, if your database is well designed, etc...".

OK, but this query will become very complicated and sure, even SQLite be very fast, it will be "too" slow (2 a 4 seconds, as I confirmed, and this isn't a acceptable time for us).

Another complicator is that, depending of user interaction, we need to "re-query" all records, because the tables involved are not the same, and we have to "re-join" with another set of tables.

So, an alternative is bring only the main records (this will never change, no matter what user does or wants) with no join (this is very fast!) and query the others tables every time we want some data. Note that on the table with 10 records only, we will fetch the same records many and many times. In this case, it is a wast of time, because no matter fast sqlite be, it will allways be more expensive to query/cursor/fetch/etc... than just grab the record from a kind of "memory cache". I want to make clear that we don't plan to keep all data in memory allways, just some tables we query very offten.

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Android :: Is There A List Of Standard Intent Specifications?

Nov 14, 2009

I'm looking into getting my application to show up when the user tries to 'share' a picture via the Gallery application I can't, however, find any information about how exactly to go about this. I get that I need to declare an intent filter for the SHARE action, what I can't seem to find is how the Gallery wants to send out the selected image. http://android-developers.blogspot.com/2009/11/integrating-applicatio... documentation is key indeed.

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Samsung Galaxy S :: Delete Item From Market List While Keeping Rest?

Oct 18, 2010

I recently purchased an application and didn't like it. I've since uninstalled it.
However it shows up on my Market application ==> download section. It says "Purchased".

How do I remove this entry from that list while keeping the rest?

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Android :: Standard Selection Color When Clicking On A List Item

Mar 11, 2009

I'd like to use the standard selection color when clicking on a list item. Where do I get it from?

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Android :: Filtered List View With Custom Adapter Not Updated

Mar 25, 2010

I have a ListView with a custom Adapter that extends ArrayAdapter. It's ArrayAdapter of Type Artist. (There are about 1200 artists in my list). Artist is a very small class that has a name and an id. The Artist Class has toString() overridden to return just the name. I have an EditText. The EditText has an TextChangeListener where I call .getFilter().filter(chars, callback) on my adapter. In the Filter.Filterlistener().onComplete() callback i print the count and it looks really good. As i type the count decreases. So it seams everything works as advertised, but the List stays the same. I tried to call artistAdapter.notifyDataSetChanged() to force the list to redraw, but nothing happens. [see 2.)]. I am tinkering around for days now! I am desperate. Hopefully someone can have a look on my code and tell me what I am doing wrong! How can I force the list to be redrawn?

Here is what I have done:
1.) Defined a ListView and an EditText like this:
<EditText xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search_text"
android:layout_width="fill_parent"
android:layout_height="35dip"
android:layout_below="@id/header">
</EditText>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_search"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>

2.) Setup my ListView in the Activities onCreate():
private ListView listView = null;
private ArtistAdapter artistAdapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_artists);
artistAdapter = new ArtistAdapter(this, R.layout.row, list); // 'list' is an ArrayList<Artist>
listView = (ListView) findViewById(R.id.list_search);
listView.setAdapter(artistAdapter);
listView.setFastScrollEnabled(true);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int position, long id) {
// do something } });
EditText txtSearch = (EditText) findViewById(R.id.list_search_text); txtSearch.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable arg0) { }
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { }
public void onTextChanged(CharSequence chars, int start, int before, int count) {
artistAdapter.getFilter().filter(chars, new Filter.FilterListener() {
public void onFilterComplete(int count) {
Log.d(Config.LOG_TAG, "filter complete! count: " + count);
artistAdapter.notifyDataSetChanged();
}});
}});
}

3.) This is my ArtistAdapter in short. I added an remove() and add() method:
public class ArtistAdapter extends ArrayAdapter<Artist> implements SectionIndexer {
private List<Artist> items;
/* other stuff like overridden getView, getPositionForSection,
getSectionForPosition and so on */
@Override
public void remove(Artist object) {
super.remove(object);
items.remove(object);
}
@Override
public void add(Artist object) {
super.add(object);
items.add(object);
} }

4.) My artist has also the toString() overridden:
public class Artist implements Comparable<Artist> {
public String uid;
public String name;
public Artist(String id, String name) {
this.uid = id;
this.name = name; }
public int compareTo(Artist another) {
return this.name.compareToIgnoreCase(another.name);
}
@Override
public String toString() {
return this.name;
} }

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Android :: How To Refresh Updated Contacts In List View Using Base Adapter?

Jul 23, 2009

Currently I am working on IM, and I am facing problem during implementations. I am implementing this messenger using XMPP client and using smack API for implementing all features like contacts list, online offline status, and chat also. Prblem which I am facing:

Its my list view where I am showing contacts list
public class ContactsList extends ListActivity implements OnClickListener{
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ContactsManager manager = new ContactsManager(this); setListAdapter(manager);
} public class ContactsManager extends BaseAdapter{
private LayoutInflater mInflater; private Bitmap mainListIcons[];
private static ContactsInfo contactsInfo; public ContactsManager(Context context) {
mInflater = LayoutInflater.from(context); mainListIcons= new Bitmap[3];
mainListIcons[0] = BitmapFactory.decodeResource (context.getResources(), R.drawable.online);
mainListIcons[1] = BitmapFactory.decodeResource (context.getResources(), R.drawable.offline);
} @Override public int getCount() { return Global.contacts.size();//
contacts is vector where I am saving my contacts
} public Object getItem(int position) { return position;
} public long getItemId(int position) { return position;
} public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder; if (convertView == null) {
convertView = mInflater.inflate (R.layout.main_settings_lists_icon_text, null);
holder = new ViewHolder(); holder.mainListDisplayText = (TextView) convertView.findViewById(R.id.main_settings_lists_text);
holder.mainListDisplayIcon = (ImageView) convertView.findViewById(R.id.main_settings_lists_icon);
convertView.setTag(holder);}else{ holder = (ViewHolder) convertView.getTag();
} contactsInfo = (ContactsInfo)Global.contacts.elementAt (position);
String username = contactsInfo.getUsername(); String status = contactsInfo.getUserstatus();
if(status.equalsIgnoreCase("unavailable")) { older.mainListDisplayIcon.setImageBitmap(mainListIcons[1]);
}else{ holder.mainListDisplayIcon.setImageBitmap(mainListIcons[0]);
} holder.mainListDisplayText.setText(username); return convertView;
} static class ViewHolder { TextView mainListDisplayText;
ImageView mainListDisplayIcon;}
public class ContactsHandler implements RosterListener {
@Override public void entriesAdded(Collection<String> c) {
for(String s:c) { Log.i("ADDED Contacts",s);
} } @Override public void presenceChanged(Presence p) {
Log.i("PRESENCE",p.getFrom()); Log.i("IS Available",""+p.isAvailable());
Log.i("UserStatus",""+p.getStatus()); if(p.getFrom().contains("@") && p.isAvailable())
{ ChatManager chatmanager = Connection.getVopConnection getXMPPConnection().getChatManager();
Chat newChat = chatmanager.createChat("gulfam@imran-mehmood", new ChatHandler());
} } }

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Android :: Contents Of List View - Using A Cursor Adapter - Are Not Updated Refreshed

Aug 26, 2010

I have a list which shows data from a database using a cursor adapter. Using Menu option I am updating my database (inserting more rows deleting existing rows). When Menu operation completes, I want contents of list should show updated contents.

I have tried using cursor.requery(); (or explicitly querying cursor again) and using adapter.notifydatasetchanged(), but with this list of contents are not updated.

How can I refresh the contents of the list.

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Android :: Call Contact List On Non-standard Android Phones

May 25, 2010

I am creating a widget that you can assign a contact to onClick. I used the method that is described here. This works great on standard Android phones such as the Motorola Droid, HTC Nexus One and HTC G1. The problem is for users who are using devices such as the HTC Incredible or HTC Droid Eris (Both running Sense UI) and I imagine on other phones who's OS deviates from the vanilla flavor of Android.Using my current method I thought that the device's OS would hook into whatever that manufacture chose to use for their Contact system however users are being sent to a random list of numbers, not their Contact list. Does anyone have a suggestion on how to get those Contacts or is this just another example of the Android fragmentation issue?

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Motorola Droid X :: List Of Updated Themes For Fission 2.2.1

Nov 19, 2010

All credit goes to those who created and updated these awesome themes!

[THEME] Revolution Remix for Fission 2.1 (Now updated for 2.2.1!)
[THEME] Kangerade Blue for Fission 2.1 (Updated for 2.2.1!)
[THEME] Revolution for Fission 2.1 (Updated for 2.2.1!)
[THEME] NexTheme for Fission 2.1 (Now updated for 2.2.1!)
[THEME] Galaxy S for Fission 2.1 (Now updated for 2.2.1!)

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Android :: Is There A Standard List Of Android Icons For Our Apps?

Feb 27, 2009

for example: for error dialogs, confirm dialogs, progress > I looked in the res/drawable in the android.jar but couldn't see > thumbnails to determine what they look like.

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Android :: How To Display List Of Images From Database?

May 21, 2009

I would be retrieving values from SQLite database and have to display it in a list view. So how should I pass the images out from the database into the list view (in fact, I only save the image uri in db). I am able to save and retrieve images individually and display it on the screen. But how do I pass a bitmap and display it in a list view.

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Android :: Way To Retrieve A List Of All Tables In Database?

Nov 10, 2010

I have this database file under the usual databases folder and a bunch of tables inside it. Please note that I don't want to retrieve under the command line. I know I can use the ".tables" command. I want to retrieve a list of all tables in it, using code, so that I can execute some specific algorithms on each of them. Also, I didn't find any questions with this problem on Android, so please forgive me if there is any. I was wondering if there is any function I can use under Databases, but I didn't find any either.

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Android :: How To Display List Of Images In Listview From Database Using Droid

Aug 9, 2010

In my case i would be retrieving values from sqlite database and have to display it in a list view...So how should i pass the images out from the database into the list view.. I am able to save and retrieve images individually and display it on the screen.But how do i pass a bitmap and display it in a list view.can you help me with some sample codes please...

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Android : Database Vs Filesystem / Gallery App For Holding List View Of Pictures

Apr 13, 2010

I am new on android and building an application which uses webservice to collect user information in XML. I also get path for a small jpeg picture of each user. (Currently there are about 200 users) I am parsing the XML and storing the information in SQLiteDatabase. Pictures are stored as blob and able to retrieve them.

I display names of users on listview with images as well. But is this a good solution for storing pictures in SQLite Database ? or should consider storing it in file system ? Which is suitable in terms of performance , as well as memory and any other pro and cons on Android.

Also like to know which is best performing XML parser for Android ?

My purpose is only to parse xml files which I get through web services and sort out the data to store in storage. And lastly my memory goes off easily when I load all images to display in list view after making thumbnails of each (which is obvious).

Was wondering is there any library/framework/app available which dynamically loads images as and when required (when that list item is on display) something like Gallery program ?

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Android :: Get Respective Value From A Database Table Where One Of Column Values Are Displayed In List View

Nov 24, 2010

I have created a table named train_table in SQLite database with 3 columns. they are train_id, train_no and train_name. Now, i wrote a class in which i displayed the train_name in a list view. how do i get the related train_no in the next page? can anyone help me in sorting this problem.?

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General :: How To Pull Data From Database Into Scrollable List

Apr 3, 2012

How to take a list of items from a database and put them into a list that a user can scroll through and then select one of them to open up a second screen.

E.g. if I have colors in my database, the screen would simply show all the colors in a list that I can scroll through to find the one I want. When I find the one I want, I can then select it to open up a second layout with the details.

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Sprint HTC Hero : Does USB Standard Have A Standard Power Output?

Oct 26, 2009

so i made a wonderful discovery this weekend that my phone will take a charge from my CD deck in my car that has a USB jack. my concern is, that it may end up damaging the phone somehow and i was beyond paranoid. does anyone know if it is a safe thing to do? Does the USB standard have a standard power output?

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Android :: Multiple-choice List From The Sqlite Database In Android

Jan 23, 2010

I'm new to Android programming, and I wanted to pull list options from a column of the SQLite database for the user to select. How would I go about doing this? Like, say the database table to be read is called countries, and the columns were ID, country, and capital. How would I let the user pick from the list of capitals and have the application return the information in that row?

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Android :: Connect To Remote Database Online Database

Nov 8, 2010

ive been looking for a week now i need some help connecting to a remote database...i want my app to get data out of the database and update the database.ive tried this http://www.helloandroid.com/tutorials/connecting-mysql-database but i dont understand it.

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Android :: Full Android Database Class For Existing SQLite Database?

Aug 23, 2010

I'm trying to deploy an application with an existing SQLite database.I've been reading though the examples that are posted but they are always missing some part of the class. I feel like I'm trying to bake muffins but no one told me to use baking powder.Can someone post a full database helper class for depoying an SQLite database on Android? Edit : Delete old code because it doesn't work.

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Android :: Synchronizing Sqlite Database On Android To A Sybase Database On Server

Apr 12, 2010

I'm currently developing a Field-Service application that stores data in the local sqlite database on an android device. At some point, usually after completing the data collection rounds, the local sqlite db is to be synchronized to a remote sybase db on the server.Any suggestions as to how this could be achieved or engineered as a solution? Or even better, are there alternatives to synchronizing data in such an application?

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Android :: Keeping An Application Running

Jul 24, 2010

This is sort of about task managers, and yet, not. I have an application I need to stay open (meebo) but Androids's task manager closes it sometimes. I have tried using task managers to keep enough memory free that Android won't kill Meebo, but it usually gets killed eventually anyway. Does anyone have an idea on how to keep it open? I am running 2.2.

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Android :: Need App For Keeping Apps Closed?

May 19, 2010

Let me start off my saying I searched this topic before I posted. I am constantly closing apps with them being restarted and I'm not opening them like Music, alarm clock, Amazon mp3 store, moxier mail, etc. The only one I actually use from time to time is music but they open on there own. Is there an app or setting to change this?

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Android :: Keeping An Application Running In The Background

Jun 26, 2009

We have an application that connects to a device and therefore needs to keep running in the background even when there are no Activities active. What is the recommended way to indicate that our application is still active and for it not to be killed automatically?

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Android :: Handcent Keeping Phone Awake

Apr 3, 2010

Ever since the last update Handcent keeps my phone awake, and subsequently kills the battery if I get a text message and don't get to it for a while. I have the pop-up set to not turn on the screen or even appear over the lock screen. I uninstalled for a while used chomp and stock, along with sms popup and neither caused similar behavior?

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Android :: Good Organizer App For Keeping Track?

Sep 29, 2010

Does anyone know of a good organizer app for keeping track of your life? Appointments and such. I have the Jorte and I do like it but for some reason it is now linked to my Face book and puts in all my friends birthdays which I do NOT want in there and I can't seem to unlink it. But I would also still appreciate any recommendations so I can check them out to see if they work for me.

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Android :: What Is Keeping Retailers From Making Apps?

Dec 9, 2009

It seems like more and more mainstream retailers are making apps for the iPhone, whether it be Starbucks, Pizza Hut, UPS, etc. When do they start making these apps available to Android users. The Droid has sold almost 1,000,000 units in a little over a month. With several phones slated for 10' do you think that this will happen?

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Android :: Keeping Service Alive Across Configuration Changes

Apr 7, 2010

The default way configuration changes (i.e., rotates) are handled is to destroy the activity & recreate it with a new one. What is the recommended way to handle these changes in an activity that binds / unbinds to a service (that is possibly heavy/slow to start)? When the activity gets destroyed, it unbinds & causes the service to be destroyed. When the new activity is created, it binds & recreates the service.

The only choices seem to be:
-- override onConfigurationChanged in the activity. Feels ok, but non - conformant.
-- explicitly start the service & only stop it when the last activity gets an onDestroy that's not due to a config change (i.e., there was no call to onRetainNonConfigurationInstance). Feels icky.
-- explicitly start the service & don't stop it until some amount of time after the last unbind. Ickier.

On a related note, what happens between activity switches within a process, where the first activity (A) starts the next activity (B) & then calls finish() -- is there a guarantee that B.onCreate is called before A.onDestroy? If not, and the activities share a service, the same issue of keeping the service alive during this window exists, but with only the icky workarounds.

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