Android :: CursorAdapter Run In Background Thread?

Sep 24, 2010

Does the CursorAdapter run on a background thread and posts updates via the UI looper thread? If not what is the best pattern to load data asynchronously from a ContentProvider?

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Android :: Run Query On Background Thread On Cursoradapter Doesn't Get Called?

Jul 25, 2010

I have a listactivity as a startup screen in my application. Which is displaying database records using custom cursor adapter. On create I set the filterable flag - getListView().setTextFilterEnabled(true)

My cursoradapter overrides runQueryOnBackgroundThread which runs corresponding query. The problem is that after typing some text and hitting enter, runQueryOnBackgroundThread never gets called. However, when the item click in the same view launches another activity(detail view of the record) and I come back to the original list activity, hitting back button, then text filtering works just fine. I don't call setTextFilterEnabled anywhere except during the initialization process and I can't really find any other API affecting this behavior, so any guesses why text filtering doesn't work initially, but all of the sudden starts working when I come back to the list activity from child activity?

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Android :: Run Background Thread In Application?

May 21, 2010

I need to run a background thread in my application. Could you please share the best practices where to initiate the thread so that keeps running irrespective of the Activity is being shown and things to consider. The purpose of this background thread is to fire transactions from the Simulator to the server and get the response back from the host.

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Android :: Avoid Background Thread Been Killed?

Mar 1, 2009

As is mentioned above,What i'm trying is to protect a sub- thread,and keep it going on as long as the App that starts it is still alive.In other words,If the system need more resources,Let it kill both the App main thread and the sub-thread started from it,Instead of just kill the sub-thread.Is there any way i can do this ?? And another question here,The android system seems to be "rude",As it killed my thread without telling me,even in the logs,Is this the case?

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Android :: Leave Running Thread In Background?

Feb 17, 2010

is there any way to leave a thread in background when i close the app in android? I read about a Service but implementing it is too much than i need.

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Android :: PopUp Dialog From Background Thread

Jun 22, 2009

I need to popup dialog to be showed when i get a message from differnt thread but the dialog should be not dependent on Activity i.e, it should display the dialog wherever the screen focus is .can it be done ..because the dialog is handled per Activity ,i thought of using service but again it would be one more thread added so want to avoid that.

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Android :: Raise AlertDialog From Background Thread?

Nov 25, 2009

In my activity there's some stuff going on in a background thread, which gets started in Activity_1. The processing of the background thread takes a while and I want to notify the user when it's completed via an AlertDialog. However, the user might have changed to Activity_2 or Activity_3 in the meantime and I would like to pop up the AlertDialog always in the current Activity.

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Android :: Create Thread In Background For Playing Sound?

Nov 4, 2010

how create thread in background for playing sound?

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Android :: How To Stop A Background Thread On Keyboard Flip?

Oct 24, 2009

How can I stop a background thread on keyboard flip in android?

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Android :: Modifying Adapter Content From Background Thread

Sep 14, 2010

I've read up quite a bit on the exception thrown while using BaseAdapter, but i can't seem to find an alternative solution: Make sure the content of your adapter is not modified from a background thread. What i want to achieve is to keep a copy of a message queue in memory, and use this message queue to populate the BaseAdapter for my ListView. The reason im doing this is that the message queue will keep getting messages from a socket even when the ListView is not currently present (for example a chat window).

The problem comes when i have the Activity with the ListView in foreground, BaseAdapter binded to the message queue's data, and a message comes in the socket. Adding the new message into the queue will throw the exception mentioned above. Unless i pre-populate my BaseAdapter with the message queue (as in the BaseAdapter having its own message queue) and updating both of them when a new message come in, i can't really find a way around this issue. I don't really want to double up the effort on keeping those 2 queues up-to-date like this, surely there is a better way of doing this? Send broadcasts around doesn't work either because of the potential delay in the adapter serving a scroll and the notifyDataSetChanged call is made.

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Android :: How To Update View Object On Main Thread By Background?

Mar 3, 2009

My purpose is very simple : each 1second, I want to redraw an object on different place on background. I do not know where my error on this code below. Here is my code:
public class My_View extends View{ private Bitmap mBackground_img;
private Drawable mMoveObject; private int mObjectw,mObjecth; private int Dx,Dy;
private Handler myHandler = new Handler(); private long lasttime;
public My_View(Context context,AttributeSet ats,int ds) {
super(context,ats,ds); init(context);
} public My_View(Context context,AttributeSet ats) { super(context,ats);
init(context); } public My_View(Context context) { super(context);
init(context); } public void change() { invalidate();
} private void init(Context context) {
Resources res = context.getResources();
mMoveObject = res.getDrawable (R.drawable.lander_firing);
mBackground_img = BitmapFactory.decodeResource(res, R.drawable.my_pic);
mObjectw = mMoveObject.getIntrinsicWidth();
mObjecth = mMoveObject.getIntrinsicHeight();
Dx = Dy = 0; lasttime = System.currentTimeMillis() + 1000;
Thread mthread = new Thread(null,doBackground,"Background");
mthread.start(); } private Runnable doBackground = new Runnable() {
public void run() { long now = System.currentTimeMillis();
if(lasttime < now ) { Dx = Dx + 10; Dy = Dy + 10;
lasttime = now + 1000; myHandler.post(change_view);
} } }; private Runnable change_view = new Runnable() {
public void run() { change();
} };
@Override public void onDraw(Canvas canvas) {
canvas.drawBitmap(mBackground_img,0 ,0 , null);
mMoveObject.setBounds(Dx, Dy, Dx+mObjectw, Dy+mObjecth);
mMoveObject.draw(canvas);
} }

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Android :: Game Doesn't Work Due To Thread Background Processes

Mar 8, 2010

I have written a very simple game with some simple animations, but I've noticed that when the phone checks email, or several other apps are running, the animations that update in my thread start behaving slowly or choppy. This is a problem as the game mechanic requires some careful timing of your screen touches based on the animations. So if it starts behaving erratically, the game doesn't really work well - and isn't much fun.
Is there a way to prevent this? Can my threads have a higher priority when they need to run?

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Android :: Background Thread - Application To Sync Contacts Largest Number

Oct 18, 2010

I am working on an application to sync contacts which are large in number. The syncing takes place in a background thread with user being able to browse through the rest of the application. I am displaying the sync status in the notification bar suing the progress bar. The problem I am facing is that there are instances when the activity is killed and hence the background thread used for syncing the contacts is purged.

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Android :: ASync Task Progress Dialog Not Showing Until Background Thread Finishes

Apr 24, 2010

I've got an Android activity which grabs an RSS feed from a URL, and uses the SAX parser to stick each item from the XML into an array. This all works fine but, as expected, takes a bit of time, so I want to use AsyncActivity to do it in the background. The line items = parser.getItems() works fine - items being the arraylist containing each item from the XML. The problem I'm facing is that on starting the activity, the ProgressDialog which i create in onPreExecute() isn't displayed until after the doInBackground() method has finished. i.e. I get a black screen, a long pause, then a completely populated list with the items in. Why is this happening? Why isn't the UI drawing, the ProgressDialog showing, the parser getting the items and incrementally adding them to the list, then the ProgressDialog dismissing?

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Android :: How To Handle Screen Orientation Change / When Progress Dialog And Background Thread Active?

Jul 10, 2009

My program does some network activity in a background thread. Before starting, it pops up a progress dialog. The dialog is dismissed on the handler.This all works fine, except when screen orientation changes while the dialog is up (and the background thread is going). At this point the app either crashes, or deadlocks, or gets into a weird stage where the app does not work at all until all the threads have been killed.How can I handle the screen orientation change gracefully?

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Android :: Moving Cursor Adapter Cursor Creation To Background Thread

Mar 29, 2010

The structure of some of my activities is a simple ListView with a custom CursorAdapter. The cursor is created in onCreate() on the activity from a SQLite database. The problem is that querying the SQLite database can be quite slow at times with lots of data (and let's assume I've already optimized the sql query as much as possible). Because it occurs in onCreate() on the UI thread, I get ugly black screens when opening the activity, which sometimes turn into ANRs, on a slow phone like the G1. I want to load the cursor in a background and show "Loading.." on screen while doing so. I saw AsyncQueryHandler used extensively in the framework, but this seems a solution geared more towards Content Providers and not application-local SQLite databases. I then thought of trying to load the cursor in a background thread, but realize that this might be problematic, as the CursorAdapter should be instantiated in onCreate() and should take a cursor as a parameter. The latest thought I had was to instantiate an empty MatrixCursor in onCreate() and pass that to the cursor adapter, while kicking off a thread/TimerTask to query the database. Then, on database cursor load, call cursorAdapter.change Cursor to the properly filled cursor. This doesn't seem very elegant and seems quite wasteful, however.

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Android : Notify CursorAdapter Changes In My Own ContentProvider

Dec 2, 2009

I am writing my own ContentProvider for my own application. And there is a ListView with a CursorAdapter pulling data from my Content Provider. My question is when there is a data change in my ContentProvider, how can I notify my CursorAdatper to requery the data and then have the ListView updated?

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Android :: GetView Vs BindView In A Custom CursorAdapter

Aug 20, 2010

I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead?

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Android :: CursorAdapter Calling BindView On Every Item

Oct 4, 2010

I was using some of the code from DeskClock and found that when I tried to modify the CursorAdapter that newView was getting called for each item. (I actually wanted to add a divider and it seems like adding the dividers separately is better than adding them into a single listView)

If I have 3 items I get the following behavior:

CODE:.............

I would've expected newView/bindView to be called once per cursor item. But, that doesn't seem to be the case. This was kind of a problem for me because I wanted to select the appropriate view depending on the cursor data, but since bindView could be called before newView that doesn't work.

Is this some odd recycler behavior (or somehow normal/expected)? Or is there something broken with the code (I removed everything except the ListView and it's still doing this)? I'm not quite sure why you would try to bind views that haven't been created, and why newView gets called on the first item twice.

If someone has an easy way of adding dividers to ListViews I'd love to know. I was going to try to dig through the contacts example to see how they did it there if not.

In case anyone's wondering MergeAdapter was neat to mess around with and try (I'll use it in some other situations). But, I did just end up writing a single adapter that handles multiple views. It computes the type of each item (which is small), stores it in a map, initializes it at adapter creation, and updates it in notifyDataSetChanged.

Then you just need to have getViewTypeCount() return the number of possible views. And getItemViewType to return the type from the map (which is 0 based, so 0-getViewTypeCount()). If you can compute your type from the position you don't need the map, but doing this on the fly wasn't possible so I just pre/recompute when needed.

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Android :: OnClickListener In Listview Populated With A CursorAdapter

Nov 19, 2010

I have a list view with 2 buttons on each row. I am using a cursoradpater to populate the list. I am also using the view holder pattern on newview() bindview().

My questions are: where do i put the clicklisteners for the buttons knowing that the action for the button is different from the action of the list item itself? Do i keep the onListItemClick ?

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Android :: Apply Custom ListView For A CursorAdapter

Oct 31, 2009

I am building a custom listview used to list contacts from the contact cursor into a list with two text view for the phone number and name of the contact as well as a place for the images. I am getting a nullpoint error when i try to setText for my TextView Even though i checked the variable to see if they contained a string I have no ideas whats wrong with it. Code...

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Android :: Way To Deal With CursorAdapter - Switching Contacts API?

Nov 5, 2010

Does anyone tried to use CursorAdapter with old and new api?

Do you have some code examples of such solutions?

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Android :: Finalizing Cursor Error In Custom CursorAdapter

Sep 7, 2010

I have a cursor adapter and the logcat is filled with above errors, as soon as I click on a view. I am already releasing the CursorAdapter's cursor in onDestroy().Is there any way to get information about when the cursor was opened?

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Android :: Instant Refresh On CursorAdapter Attached To A ListView

Oct 14, 2009

I have a CursorAdapter attached to a ListView, the ListView contains checkboxes for every row. When I check/uncheck a checkbox in a row it will update it to a 0 or 1 in the database (This is working fine) I also have another checkbox in the same Activity that when pressed will disable all the checkboxes in the ListView [ setEnabled(false) ].

The problem is that when I press this checkbox the ListView checkboxes return to their initial state when I started the activity. It does not matter the number of checkboxes I changed during the activity.

However, if I press the back button and then re-enter the activity all modifications are saved because the Cursor is refreshed. I am calling notifyDataSetChanged() at the end of the the methods that disables all the checkboxes.

I also tried this for every checkbox in the ListView but it did not work (was unable to check a checkbox) Any ideas?

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Android :: How To Update CursorAdapter Tied To Listview When Number Of Items Changes?

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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Android :: CursorAdapter Notify Data Set Changed Doesn't Work?

Jul 1, 2010

I'm trying to clean up some code and now I'm determined to get this seemless ListView updating working...

I want my ListView to be updated when I call notifyDataSetChanged() but nothing happens... I'm also passing the autoRequery flag to true when creating my CursorAdapter.

Cursor c = FavoritesHandler.getCategoryFavorites(getSQLiteInstance(), category); m_favoriteAdapter.changeCursor(c); startManagingCursor(c);

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Android : Java - Implement A Run Method Of Thread If Create A Thread Global

Sep 7, 2010

How can I implement a run() method of thread if I create a Thread Global?

I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?

In the run() method I have to write the code to perform some action.

IF I can do it then please can anyone show me briefly how to do it particularly.

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Android : Handle Messages Between The Main Thread(the Deafult UI Related Thread) And The User Created Gamethread

May 21, 2009

I am writing an application in which i need to handle messages between the main thread(the deafult UI related thread) and the user created Gamethread.

The requirement is like this.

An activity(say "Activity_X") is setting the view by "setContentView(some "View_Y")". In "Activity_X" i have implemeted "onCreateOptionsMenu()" and "onOptionsItemSelected()" fucntions for creating menus & a switch case for action to be taken on selecting those menus.Menu has items like "resume/pause/zoom/" .

All action to be take on selecting these menus are implemented in "View_Y" in a separate Gamethread by extending "Thread" class.

So whenever a menu is selected in "Activity_X" i need to send a message to "View_Y". And on receiving this ,a particular action/method should be called in View_Y(GameThread).

How can i achieve this using Handlers?Is there any other way of doing this? Please do share with me some code snippets for these.

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HTC Droid Eris :: Remove Certain Texts From Thread In Easily Instead Of Whole Thread?

Dec 28, 2009

Does anyone know how to delete certain texts from a thread in an easy manner instead of having to delete a whole thread??

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Android :: Update ListView In Main Thread From Another Thread

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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Android :: Use Thread With SurfaceView - Ie Draw In Separate Thread?

Jul 22, 2009

I want to do the drawing in another thread to speed up the game(it is way to slow right now). I was told to do this but don't quite understand why that would speed things up. Is it GameView that should implement Runnable? Should I make the thread sleep when not drawing? where should I start the thread? package com.android.WWS;

import android.app.Activity; import android.content.Context; import android.graphics.*; import android.os.Bundle; import android.view.SurfaceView; import android.view.KeyEvent; import android.view.View; import android.view.View.OnKeyListener; import java.lang.Runnable; import java.lang.Thread;...................

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Android :: Suspend / Resume Thread From Another Thread In Same App

Feb 20, 2009

I need to suspend/resume a thread from another thread in the same process. I tried to look into thread apis,but I couldn't figured out a way to achieve this.Can anyone pls point me some references to look or give a tip to do this.

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Android :: Open Helper To Open Database And Get A Cursor To Pass To CursorAdapter

Jul 1, 2010

I have a ListActivity that uses a CursorAdapter to fill the rows in the view. I wrote a database helper class that gives me back results for common queries I make for my app, and it uses an SQLiteOpenHelper implementation I wrote to open the database. I use the open helper to open the database and get a cursor to pass to my CursorAdapter.

Here's a code snippet:

CODE:...................

The problem I'm having, that I didn't have before I implemented the open helper (before I just opened the database directly without a helper), is when I click on an item, which takes me to another activity, and then go back to this activity. When it initializes everything is fine, and my list is populated fine, but when I go back from the activity that follows, the list is empty and in the LogCat I see "Invalid statement in fillWindow()".

It appears from a few post I've seen that the reason is, when I requery the cursor, the database is closed. But I'm not closing it! I'm scratching my head on this one.

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Android :: Main Thread The Same As UI Thread?

Jul 16, 2010

The Android doc says "Like activities and the other components, services run in the main thread of the application process." Is the main thread here the same thing as UI thread?

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HTC Incredible :: Root Notification Thread (Root Achieved And Thread Open)

Jun 3, 2010

Status: ROOT ,,Root Notification Thread (Root Achieved and thread open)

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Android :: How To Add A Background Theme / Background Wallpaper To My App?

Nov 18, 2010

How to add a background theme and/or background wallpaper to my app? Right now my app background is plane.

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HTC EVO 4G :: Need A Sticky Thread

Jul 13, 2010

Mods. IMHO we have a lot of new users that are rooting their phone just for the sake of saying that they have rooted their phone. We have seen this before with other phones, not unlike the iphone, but the reasoning behind JBreaking an iphone, in hindsight, is crystal clear. We were trying to get more performance out of the platform vs the crap the apple and itunes were offering. Most of us have lived and learned through that process and want to put it into practical application here with the evo hyc 4g platform as well. That being said its obvious that this is the main driver behind rooting the evo as well. It may best serve the interest of our/your users, new and old, to detail out the pros and cons of rooting the evo. If this already articulated somewhere in the forum I would say, i stand corrected and pardon me. If not lets ask one of our senior posters/mods to offer that advice up and sticky the post appropriately.

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Android :: Using GPS In Thread

Mar 12, 2010

I have a bluetooth thread started that handles the bluetooth request. Once the connection is made the thread is killed and a Connected Thread is started. Once the Connected Thread is started I want to turn on GPS so I can start feeding the GPS data through the output of the bluetooth. The problem is, I can't get GPS to start in a seperate thread other than the main Activity. I don't want that to happen as I would like to have this run in the background and not be dependent on the main Activity. I have tried turning on the GPS from inside the Connected Thread but that always leads to a RunTimeException. how to get GPS to run in a thread?

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HTC :: All EVO 4G Wallpaper Thread

May 15, 2010

Since we have a small wait ahead of us for the EVO to hit shelves. I thought it would be a good idea to share some wallpapers with each other. We know the phone's specs, resolution and know what to expect for the most part so why not get ready for the big launch day with some potential wallpapers to use. I'll start it off in my following post with some that I borrowed from the Incredible forum. Just a note: It seems the best resolution to use for the EVO would be 960x800. Please post that size. If you find something that would make a great wallpaper and you'd like to share it, maybe crop the selection to that size or resize it. There is a way to post the pictures as thumbs but I really don't know it. If anyone is willing to share that, I'd resize it even small. Let's try and keep it as easy for people to share as possible. Now to the selection!

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Android :: How To Use AsyncTask From Thread?

Jul 29, 2009

I'm developing a game based on SurfaceView and a game thread for the whole game thing.Now I want to do some HTTP requests triggered on events inside the thread. They should of course be asynchronous, so the game doesn't stop. I found AsyncTask to be a neat way to do this but I'm having trouble implementing this at the moment. Maybe I misunderstood the concept of AsyncTask,I don't know it just drives me nuts as I read docs and blogs and still I don't get it. So sorry if that's a dumb question but I'm mad of thinking about it.

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HTC EVO 4G :: I Received The Htc Fps Update - Thread

Sep 22, 2010

Anxious to see when people start getting this update.

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HTC Incredible :: Thread For Best Applications

May 5, 2010

Can someone help me find the thread for best applications?

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Android :: Service Within Thread?

Jan 18, 2010

I am new to Java and Android.I would like to retrieve remote data and display it within my activity. To prevent tying up to UI, I understand that I can do this in another thread. (I thought I could just-as-well fetch this remote data from within a service, but that appears to tie up the UI thread also). So now I'm beginning to think I need to either run the logic from a new thread within a service, or run a service within a new thread. But which? I have found many examples online of running new threads or services, but I have yet to find an example of both at the same time.

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Android :: Thread Stopping Alone

Jun 7, 2009

My appWidget is working well. When it's installed and used by user, a Thread is launched to refresh view (like a flipper). Even if the screen is off, the thread is continuing...perfect for me... But after 3 minutes, it's stopped.

Does it a VM restriction avoiding some bad development usage?

How can I use this type of service? Develop a service in place of my thread?

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Android :: Any Way To Indicate Thread ID In LogCat?

Sep 22, 2010

I am trying to understand threads and how they work, and when, etc. I expected the pid in LogCat to be different in the background thread logs but the pid is always the same. Is the pid something other than the thread ID? If it is, is there a way to indicate the thread ID in LogCat?

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