Android :: Multiple Successive Queries To A Database
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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Apr 27, 2010
I have been trying to find a discussion on the best way to handle a common sqlite database which is shared by multiple Activities (or multiple Activities and Services). This is all in the same application.
It seems that if each Activity has:
CODE:.........................
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Jul 20, 2010
I am developing an app which requires me to write to an SQLiteDatabase in one activity and access it from another activity . I am facing a problem implementing this. Any suggestions/ideas as to how we can share the database across multiple activities?
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Feb 22, 2010
How to create two or more tables in one database in single class which extends sqliteopenhelper in one function oncreate.
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Apr 1, 2010
I would like to apply successive animations (say ScaleAnimation) to an ImageView showing a resource image. The animation is triggered by a button. For example, I would like to incrementally enlarge an image upon each button click.
I've set fillAfter="true" on the animation. However, all the animations start from the original state of the ImageView. It seems as if the ImageView resets its state and the animation is always the same, instead of starting from the final state of the previous animation.
CODE:.......................
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Dec 15, 2009
I have a todo list type application that stores all of the note data in a sqlite3 database. Each activity in the application needs access to the database to edit different parts of the data in real time.
Currently, I have each activity open its own DBManager object (the helper class I created to manage the database). This is causing problems though and I would like a slightly more global access solution so I don't have to keep opening/closing/creating a database.
I'm considering several options, and would like to hear pros and cons of each as well as other suggestions.
Singleton style. Have a wrapper class that returns a reference to the only database manager so any activity that needs it can use it.
Static Manager. Have the manager class be entirely static members and have it open the database on load. Easily accessible by anyone that needs it (which is everyone).
Merger between 1 and 2. I could make a database manager class that initializes the member singleton instance of the database and all of the data manipulation methods were static. Then I wouldn't even need a reference to the singleton to access the database.
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Oct 12, 2009
Can two or more Android Activities open an sqlite3 database for write?
I have two Activities that need to insert data into the same sqlite database. When the second Activity calls SQLiteOpenHelper.getWriteableDatabase() an IllegalStateException is thrown with the message "SQLiteDatabase created and never closed".
I've been able to avoid the Exception by making my database object a singleton but I'm thinking there must be a better way.
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May 7, 2010
I'm writing an RSS reader for Android. I've faced a certain difficulty which the problem I can't resolve since databases aren't my expertise.. So i figured out maybe one of you could help me out! I currently have 3 tables (Categories, links and feeds). My goal is too link a feed to multiple categories. Therefor I'm using a Link table. My databases is an Android ContentProvider (sqlite) and looks like the following:
| Categories | | Links | | Feeds |
|------------| |---------| |-------|
| _ID | | Category| | _ID |
| Title | | Feed | | Title |
| URL |
I currently wrote the following code in my FeedListActivity to retrieve a list of links and their feeds.
CODE:.................
Now my question:
I was wondering how I could optimize this database layout, code or query so I would get my entries in a more efficient way. Because i believe this link table or the query to retrieve links isn't needed! Or am i doing this the correct way?
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Jun 24, 2010
I've just started working with SQL and Android and from what I can see, updates and inserts back to the database need to be handled individually?
I can retrieve a Cursor containing multiple records, but if I wanted to apply an update to each record in the cursor, I can only see how to do this individually, using ContentValues and Update(), and then the cursor requires reloading??
Same with if I wish to create multiple new records, these appear to be required to be inserted individually? Can I not create a List and bulk insert?
To me this seems slow and cumbersome, and there has to be something I'm not yet aware of (searching for answers is failing me... likely due to using incorrect terms being new to android/java)
Here's a very simple example of what I basically what I want to achieve, however there must be a better way to achieve this functionality. (I know there are some other bad practises in here, just creating a quick eample)
CODE:.........................
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Nov 20, 2010
My app uses two databases (separate files). To handle these databases I have created two Helper classes which extend SQLiteOpenHelper, one for each database.
I am now going to add a third database and wonder whether I need to create yet another Helper class (and if I used a 4th and a 5th database would I need even more Helper classes), or can I use the same Helper class for multiple databases?
The problem that I see with trying to use just one Helper class is that I can't see how to pass the name of the individual database files to the Helper. At present the name of the database is hard-coded as a Static field of each of the Helper classes, but if I had only one Helper class I would need to be able to pass the different names in to the Constructor when creating the separate Helper objects; the problem is that the SQLiteOpenHelper Constructor seems to be called by Android with just one parameter: the Context.
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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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Aug 30, 2010
I'm thinking about creating an application that uses multiple databases. The user would be able to specify the name of the database to be created, and select which database to use from those existing in the /databases/ directory.
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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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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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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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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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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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