Android :: AsyncTask And Queries
Dec 27, 2009
Can anyone point me to a good example where a AsyncTask queries a local SQLite database and then updates the UI successfully. I have a database which I query using doInBackground... create a new custom SimpleCursorAdapter (overriding onViewBind), return the adapter (SimpleCursorAdapter), then in postExecute() create ListView adapter which is set to the the SimpleCursorAdapter, that was returned, then I set the listview adapter using SetAdapter(adapter);...
For some reason I throw an exception on fillWindow.java:200....
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Jul 28, 2010
I'm trying to figure out the correct way to create an AsyncTask to retrieve some data from the internet and then to take that data and bundle it up in an Intent and pass it to a new activity(A list display). So in the first activity I just have an EditText and Button. In the event of an OnClick the task should be called and when it is finished the data should be bundled inside an Intent and passed to the next Activity. The problem is when I take the results from onPostExecute and set them to an instance variable of the main activity, that instance variable is still null when the task is complete. Here is the barebones version of the code:
CODE:...........
When I debug the application I see onPostExecute does contain a valid PlacesList full of results, so why is the instance variable places set to null after the task is executed? I am going about "returning data" from an AsyncTask incorrectly?
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Mar 16, 2010
I am running cts test cases on eclair . I've done with : . build/envsetup.sh; lunch 1; make cts
That compiled my all cts test cases. Apk's for that all have been installed in $(ANDROID_BUILD_TOP)/out/target/product/generic/data/app :
few of these are : CtsDatabaseTestCases.apk , ApiDemos.apk etc.
Now I start my emulator :: ./emulator &
I "adb push " to all apk's to my emulator .
Now my query is how to run these apk's on device /emulator ?
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Nov 5, 2009
I start a long-running SQL SELECT query and, before it finishes, wish to make a short-running SQL SELECT query. Both queries are on the same tables. The whole database can be considered read-only. My initial tests show that the short-running query only actually starts when the long-running query has finished.
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Mar 24, 2010
I was monitoring the traffic on Eclair 2.1 and noticed periodic DNS queries to "android.clients.google.com" after launching IM/Email/ Browser even though the phone was idle and I was not doing anything. why Android generates these periodic queries to "android.clients.google.com"? Is there a specific service generating these queries?
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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 1, 2010
There is a user input then on submit pass the search keywords to the db server and return the results (the db server has to be external by the way). Could i pass the search query to server side (php) and get the php script to execute the queries and return the scripts output?
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Aug 27, 2010
I'm just using the build in email app for my hotmail, gmail, work mail etc. However It keeps bringing up old messages that I leave in my inbox. How can I get it to not keep displaying these? Or better yet is there a killer app out there that does email/contacts better? I hate having to use the whole gmail thing.
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Apr 10, 2009
Has anyone other than me needed to make consecutive queries to a sqlitedatabase? My application works sometimes but other times (about 98% of the time), the app will crash. What I'm doing is using the sqlitedatabase.query(..) to return a cursor which I parse, I make multiple successive queries to the database and parse different recordsets/cursors.
My question would be does a sqlitedatabase need to recover or clean up after a .query is issued?
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Dec 14, 2009
I am using sqlite db in my app. i am able to create db and table and execute queries. But I wanted to know where is the sqlitedb created, so that I can check them from commandine. where doed that android store ? I searched, could not find anything on that name in my pc, does android encrypt the name of the db file ?
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May 15, 2009
A couple of questions. First thing I was wondering is where to log bugs in the docs. The ContentProvider query() docs are missing selectionArgs in the example code. It also uses the deprecated addId instead of ContentUris.withAppendedId().
With regards to the selection options - how exactly can these handle? I've seen a couple of places where a something + "='" + somevalue "'" is used, but I'm specifically wondering if it can handle IN clauses or if there's some form of or statement I can use to check for a variety of values in a particular column rather than just the one.
Last question is about the Contacts PERSON_ID and how long-lived that is. It is guaranteed to never change (though may be removed obviously). Well not truly guaranteed but will only cycle after it runs out of unused integers. Or may they change value as contacts are removed?
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Dec 15, 2009
have an activity handling search (ACTIVITY_1), which works perfectly when I use the search (via SEARCH button on the phone) within/from this activity. However, when I use search from another activity (ACTIVITY_2..x) by implementing onNewIntent and forward the query string to my Search_Activity.class (ACTIVITY_1) it always pauses ACTIVITY_2 first and then goes to onCreate() of ACTIVITY_2..................
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Jun 18, 2010
I own LG EVE (GW 620)....
1)I want to password protect my text messages.
Please suggest me any application which should be free to do that..
2)IF i get an app from internet source (download via PC and installed via Linda etc.) ,will it be full version of that app??
3)Is there any way i can transfer my text messages in phone to my PC and vice versa?
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Apr 19, 2010
If i can do the following with regards to the email accounts on my desire:
1) have the exchange email client update the folders i've got setup (i have rules on my work account sending items to various folders depending on subject/sender etc and they don't seem to update automatically.
2) using the gmail app it doesn't seem to update automatically (or even on a schedule as i cant find one for it).
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Oct 1, 2009
Ive turned the bluetooth on and paired it with my old phone(se k650) what im trying to do is bluetooth all my contacts across but when i press so send via bluetooth on the SE it wont find the hero, even when its on discoverable, and when i go through "my devices" on the SE and look at the hero its offering no services. Ive also trying sending stuff from the hero and to the hero like photos and such with no luck.
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Aug 31, 2010
I have some queries:
1- I have Desire with Froyo. So, technically whenever I install an app, I should be given an option to install it on SD card. But so far, haven't seen it yet, consequently today I got a message that phone memory is running low. So, please help me out.
2- Secondly, last night due to some reason I opened navigation first time and there came two pop-ups asking me for some settings. I ticked them and then a satellite logo appeared on top bar. Does it consume a lot of battery?
3- So far I have set many applications on automatic updates but I have observed that I have to always update them manually. They don't get updated automatically.
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Jan 23, 2010
Well I bought my Galaxy here in India yesterday, and you all and this forum has been a major source of info to make up my mind.
Well I've bee browsing this forum trying to understand all that I need to know for the past two days before I could muster the courage to ask a couple of questions.
1) My Galaxy is on Firmware II3, is it worth upgrading to IK5 ?
2) When I upgrade, does everything, contact, apps etc, get wiped of from the device or do they remain as they are ?
3) Is there a way I can take a complete backup of my contacts, apps etc and restore them after a firmware update ?
My phone has not been rooted yet and I plan to use ODIN for updating the firmware.
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Sep 5, 2010
My wife has been playing with her new phone and needs some help with contact management.1, How can she keep the telephone contacts separated from her facebook contacts. Currently when she presses the phone button from her home page it seems to show all contacts. However when she goes to HTC People it is set to only show phone contacts not facebook contacts. 2, When you have facebook contacts how do you delete them? Do you have to remove them as a friend?I've changed my phone number on my facebook profile but it still shows on my wife's desire as my old number. She's tried removing me as a friend and re-adding me and it's still wrong.
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Mar 6, 2012
I went through many threads regarding XT530. links are URL>....the first thread is said to be root XT530 (2.3.5 based) but the title goes for XT316(2.3.4). So i am a bit worried if thats alright or i got wrongly redirected over there. Moreover, the links for the files weren't working, so i need links for the files needed (like Google GMS pack).
the second thread says it will root the current android version, but i need to ask if that would install Google GMS services automatically or i need to download that pack externally.
1. I got just 19mb to 25mb as my internal memory constantly. i mean, i dont think i would get more than 35mb of internal memory even if i remove all apps installed. is it normal?
2. would i be able to shift apps to SD card after rooting?
3. can i overclock my phone? and if yes, what is the maximum limit?
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May 31, 2010
1. Is there a software update for the Sony Xperia X10 yet ?
2. When i receive an email i go to open it and it can take up to a minute to open or i have to go to my next email and return to the previous one and it then appears ??
3. Lastly , i tried sending a video clip through email on the X10 and it said its to big anyway around this?
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Dec 15, 2009
I have an activity handling search (ACTIVITY_1), which works perfectly when I use the search (via SEARCH button on the phone) within/from this activity. However, when I use search from another activity (ACTIVITY_2..x) by implementing onNewIntent and forward the query string to my Search_Activity.class (ACTIVITY_1)
@Override
protected void onNewIntent(Intent intent) {
Log.i(TAG, "onNewIntent()");.....................
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Apr 6, 2010
I am working on a simple application (studying purposes) which list all the files from a selected folder. On top of that I would like to have a search feature where the user can search for files (the code for that is already in place). Now, I was thinking about having the search running in the background somehow, whilst the user can still navigate, create folders, copy, sort and do other stuffs normally. When the search finishes the user would get a notification and then could click on it and go to that activity (It ideally should be the same ListView I already use for browsing the files, I would just need to update the Adapter there with the latest processed data after clicking in the notification). What's the best answer for that? Threading or AsyncTask?
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Jul 15, 2009
My application parse an xml file dans display data in a list view. On start of application i load data using an AsyncTask. A Progress Dialog is display during the load. This part works fine.A button in the application make it possible to reload the data. I would like to run the AsyncTask but the sytem say i can't alter view in other thread. I have also read an AsyncTask can't be run another time So i would like to know what is the best way to do this and not to have the "application not responding" message.
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Aug 9, 2010
I know this is not how an async task should behave but my question is how to "block" the user while executing it.My need is the following: I have my own backup/restore process and I have an async task to run these two actions. The backup is fine, I can warn the user when the backup is done and that's just fine But my problem is about the restore process. When the user click on restore he shouldn't be able to make any change in the application (and anyway don't want to because he would lose all his changes).I understand that having the user blocked while restoring (or maybe with a progress bar) is not a best pratice but I do not see any other possibility in this context.
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Apr 9, 2010
I know how to use AsyncTask in a standard manner to manage operations that are in the background in relation to a UI thread.However,I want to run a task in the background which might run for a very long time under certain circumstances. In these cases, I would like to force the background task to fail if it runs for an excessive amount of time.I know that I can invoke the "get(long timeout, TimeUnit unit)" method of AsyncTask in my UI thread in order to terminate my background task if it runs too long. However, in that case, my UI will block while this "get()" command is waiting.There are probably other drawbacks to directly calling "get()" in this manner, not the least of which being an evil interaction with the "done()" method of AsyncTask's contained FutureTask object, which itself is calling "get()" at least this is what I see when I look at the source code for AsyncTask.
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Jul 5, 2010
I have an activity that needs to do some stuff in the background. When the background is done, I want it to load a new activity.I can successfully kick off the async task and using using ViewSwitcher I can show a nice progress dialog.However, when the user hit 'back' or 'close' from the new task, I want them to see the main screen of this task again. So, I use the showPrevious() after I start the new Activity, but I see the screen switch from the loading window back to the main window BEFORE the new Acitivity is launched.How do I get it to switch after the new activity, or when they come back from the new activity?I tried onRestart() and onResume() but both of them seem to give me a view of -1 that I couldn't do much with.
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Sep 20, 2010
I'm running a network service within an ASyncTask. I want to be able to time the task, and after a certain period of time interrupt it.Is there a simple way to do this? Basically, when the doInBackground() methods starts, I want to say "If it hasn't completed in 30 seconds, do something else".
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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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Mar 13, 2010
while debugging and app that uses AsyncTask to record audio and update UI I noticed that everytime that an AsyncTask object ends running (finishes doInBackground and onPostExecute or on Cancelled it´s thread stays alive (running status).At least for me that should not be the behavior of the class since the doInBackground task may not stay running forever (as an example the android manual says that a status bar should be updated by an asynctask, and it won´t last for the whole app running time).Is there anything I´m missing, as a method to destroy it, or should I just ignore and keep creating threads as I need and the VM will handle them as it needs resources?
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Jul 18, 2010
When I try to compile to following code, I get two errors:
Description Resource Path Location Type
Syntax error on token "void", invalid Expression AsyncTask.java /AsyncTask Project/src/org/me/asynctask line 19 Java Problem
Description Resource Path Location Type
The type AsyncTask is not generic; it cannot be parameterized with arguments AsyncTask.java /AsyncTask Project/src/org/me/asynctask line 25 Java Problem
CODE:............
Obviously AsyncTask IS a generic (http://developer.android.com/reference/android/os/AsyncTask.html#execute so why do i get those errors?
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