Android :: Why SQLiteOpenHelper.onUpgrade Fail?

Sep 13, 2010

Every time i increase my database version and push the upgraded app to the users, something weird happens.. For some it works perfectly fine, and some report crashes (including through the Market's reporting system) caused by the lack of table columns i just added in onUpgrade.

If you want to see the method:
http://code.google.com/p/tag-todo-list/source/browse/trunk/Donut/src/com/android/todo/data/ToDoDB.java#136

I can't spot any exceptions that appear in onUpgrade. What i'm currently doing to bypass these problems is intercepting the exceptions where the new fields are invoked for the first time and then calling onUpgrade 'manually', which is kind of dirty.

Also, the app sometimes generates a 'no such table' SQLiteException when accessing the main table (again, only for some users) which is incredibly strange... Does someone know why these things happen? Or can you spot something wrong in my code?

Android :: Why SQLiteOpenHelper.onUpgrade fail?


Android :: SQLiteOpenHelper - OnUpgrade

Sep 10, 2009

I get a SQLiteException if I try to issue an alter statement in the onUpgrade method of SQLiteOpenHelper subclass:

Can't upgrade read-only database from version X to Y: /path/to/db

That makes no sense at all! Where did I go wrong?

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Android :: SQLiteOpenHelper OnUpgrade()

Aug 17, 2010

I am doing my first app with a database and I am having a little trouble understanding the onUpgrade function. My database has a table with an items and a favorite column so that the user can favorite an item. Most implementations I see simply drop the table and reconstruct it but I don't want to do this. I want to be able to add more items to the table.

When the app is upgraded through the android marketplace does the database know its version number? So could I increment the version number in the code and then export it to the marketplace and when the user boots up the upgraded version for the first time then onUpgrade will be called?

If this is the case my onUpgrade would simply pull from a file and add the database items in. Is this a standard way of doing things or is there a better way of handling this in Android. I am trying to stay as standard as possible.

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Android :: How To Emulate OnUpgrade Call In SQLiteOpenHelper

Oct 17, 2010

How can I emulate an onUpgrade call for my SQLiteOpenHelper class? I have tried changing the version number in my SQLiteOpenHelper class and versionCode in manifest but onUpgrade is not called. Any idea? I need to check my onUpgrade code before upload it to the market, I don't want my app's users get a buggy upgrade.

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Android :: Is OnUpgrade Method Ever Called?

Jul 2, 2010

Is the onUpgrade method of SQLiteOpenHelper ever called? If so, when is it called and by what? Or if it is not called by developers, then why is it there? What should be done in the method I have seen examples where it drops all the tables, but then a comment says that dropping all the tables is NOT what you should do.

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Android :: How To Call OnUpgrade Method Of Database?

Jan 31, 2010

How can i call the onUpgrade Method of the database? Background of my question: I do a backup on the sdcard of the full database. And the user can restore this database. But if in the meantime (between backup and restore) an app update has made changes to the database i get a problem on restoring. The new columns are not there after restoring. So i want to call the onUpgrade method to add all new/changed columns. Or is there a better way for this?

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Android :: SQLiteOpenHelper Per Activity?

Jul 21, 2010

Do I need an instance of my SQLiteOpenHelper class for each Activity I have? I have 1 currently that all activities access, but started getting an exception

"illegal state exception SQLiteDatabase created and never closed "

on simple a simple query and I can't seem to figure out why this is happening. I read online about this, and wanted to try to understand why the SQLiteOpenHelper was dependent on an Activity.

Is there a way to just have open SQLiteDatabase object without the Helper and have it just exist within all activities?

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Android :: Having Several SQLiteOpenhelper In One Appli?

Feb 11, 2010

I would like to know if it is possible to have several DbOpenHelper in the same app Android but to use them to write and read in the same database? because I'm trying to create tables from 2 different OpenHelper (with different names) and only the first one seems to create. when I try to run the 2nd one, i get an error...

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Android :: SQLite Using The SQLiteOpenHelper

Jun 9, 2010

I have a SQLite database, and several tables within that datbase. I am developing a DBAdapter for each table within the database. (reference Reto Meier's Professional Android 2 Application Development, Listing 7.1).

I am using the adb shell to interface with the database from the command line and see that the database is being populated as I expect. Occasionally, I want to drop a table so that I can ensure it's being built properly, from scratch.

The problem is that SQLiteOpenHelper only checks to see if the database exists. Is there a typical solution to writing a helper to also see that the table(s) exists? Basically once I drop a table, the helper checks to see that the database exists and assumes all is well.

Also, the CREATE_DATABASE string used in the reference above only creates the one table. Should I consider using the DBAdapter for an adapter to ALL of my tables? That doesn't seem as clean to me.

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Android :: SQLiteOpenHelper Documentation Not Clear

Jul 9, 2010

The documentation does not make the interation between onUpgrade() and onCreate() clear.

When implementing onCreate() should this create the database at version 1, assuming that onUpgrade will apply all of the patches to bring it up to version x (lets say version 5 for example)? Or should onCreate build the latest version of the database, and onUpgrade is only used to upgrade legacy clients.

I kind of prefer the first, because it effectively means that the same SQL is executed for everybody. Whereas the second options means that there is a potential for onCreate to build something slightly different to the succession of patches built by onUpgrade.

I can always make onCreate call into onUpgrade, however, this is the kind of implementation detail that should go into the javadocs...

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Android :: SQLiteOpenHelper Without Or Less Restrictive Use Of Context?

May 21, 2010

If you extend SQLiteOpenHelper, for the Constructor you have to use a Context. I am wondering if there is a way to leave this out, and be able to work with database tables without a Context.

Or at least be least restrictive, I mean a way of project/class structure that will make history the several context passings I have to do now.

As it is my application has several level of classes, chained in each other, and there are a few that connects to the database, but have no whatsoever influence on the interface, so they don't actually need the Context.

Are you creating your classes in the way that you pass each time a Context to them?
If not, how you do, how you reuse a Context in a short class?

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Android :: Why Isn't SQLiteOpenHelper Called Just SQLiteHelper

Jun 11, 2010

The documentation describes the class as a helper object to create, open, and/or manage a database. Having that in mind wouldn't you say that the name is a little misleading?

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Android :: SQLiteOpenHelper Existing Database?

Jun 9, 2010

I have an existing SQLite database file from another project.

Where do I include the database file into my Eclipse project to have it deploy with the app.

Do I need to indicate that the database file is writable? (In the iPhone world you need to copy the database file from the app's bundle to a writable folder on the iPhone proper before first use.)

Once I have the database file on the phone, how do I tell SQLiteOpenHelper to use it? (I extend SQLiteOpenHelper in a custom class.

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Android :: Database In Application - SQLiteOpenHelper GetType?

Aug 24, 2010

I'm trying to implement a database in my application. I'm following a tutorial about writing my own ContentProvider, but I'm confused about SQLiteOpenHelper::getType. We're supposed to write it and, essentially, write a switch that returns the MIME type corresponding to the type of data we're dealing with.

I don't fully understand it. I'm not sure, even though I have an example, what is precisely supposed to be conveyed here. How do I determine the MIME type of my different tables of data?

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Android :: Calling GetSharedPreferences(); From SQLiteOpenHelper Class?

Feb 27, 2010

I have two classes, one MainClass and one DataBaseHelper class, which extends SQLiteOpenHelper.

From my MainClass I call a method in the DataBaseHelper class to open a data base. Before opening the data base I want to check the users data base version (this is important as soon as I want to update the data base and push it to the Android market). So from the DataBaseHelper class I call the following method, which is in the MainClass.

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

I call the checkCurrentDbVersion() method from the DataBaseHelper class like so:

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

As soon as the debugger runs the following line, it stops.

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

I have no constructor defined. Could that be the failure?

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Android :: SQLiteOpenHelper.getWriteableDatabase() Null Pointer Exception

Nov 16, 2009

I've had fine luck using SQLite with straight, direct SQL in Android, but this is the first time I'm wrapping a DB in a ContentProvider. I keep getting a null pointer exception when calling getWritableDatabase() or getReadableDatabase().

Is this just a stupid mistake I've made with initializations in my code or is there a bigger issue?

CODE:.........

But here's LogCat showing the exception:

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Android :: Android - Use One SQLiteOpenHelper Class For Multiple Database Files

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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Android :: Fail To Connect To Camera

Apr 1, 2010

I'm using the Android APIDemo sample code.

When I run the CameraPreview example, at first it was giving me an error.(http://stackoverflow.com/questions/2556389/android-camera-functionality-howto)

I traced that one down and the sample was working for a while.

Now, it no longer works. It says ERROR/AndroidRuntime(2949): java.lang.RuntimeException: Fail to connect to camera service

What can be causing that? It happens when camera.open() is called.

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Android :: When Going On Any Droid App - It Says Login Fail

May 30, 2010

I have a problem with my Motorola Droid; When i try to go onto one of my droid apps; and when i log on... it says "Login fail" WHat cando i have to do in order to go back to being able to login to my apps? This includes my Meebo app, Yahoo Messeneger app. and my photobucket app will not let my download a pic. to my phone, I use to be able to do all of this, but now it isnt working.

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Android : Fail To Launch SDK 2.0 Tool On OS X

Nov 2, 2009

I downloaded the SDK 2.0 toolkit and tried to launch the android tool to download the latest SDK. The application seems to launch with the following output:

$ ./android-sdk-mac/tools/android Starting Android SDK and AVD Manager No command line parameters provided, launching UI. See 'android --help' for operations from the command line. $

That's it. Nothing happens, no UI appears or any processes are started (check with ps, but there is no new java process). I'm running this on Mac OS X 10.5.8. The previous SDK s runs fine.

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Android :: Fail To Connect Camera Service On G1

Nov 16, 2009

I apologize in advance for this long post, but it's necessary to show what is happening.

I've been working on an app that works on the 1.6 emulator, but bombs on my G1.

Here is the Photographer activity:

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

And here is where this activity gets called from:

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

Having trouble pasting the relevant portions of AndroidManifest.xml, but I have permissions for Camera:

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

Here's the Photographer part:

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

Also set for testing on G1:

android:debuggable="true"

and working off of 1.6:

<uses-sdk android:minSdkVersion="4" />

All this works on a 1.6 emulator, but when I run this on the G1, LogCat shows:

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

And /data/anr/traces.txt shows:

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

It sounds like the problem is a timeout issue, but I am at a loss as to where I should be looking ....

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Android :: Fail To Connect Camera Service

Jul 30, 2010

I had my camera set to this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); and it works fine but if I change it to PORTRAIT instead of LANDSCAPE then it crashes with the following error...

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

The method it crashes in is..

CODE:.........

It crashes at mCamera = Camera.open();

My Manifest file has <uses-permission android:name="android.permission.CAMERA"></uses-permission>

How do I fix this so I can view my app in Portrait?

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Android :: Fail To Install Maps.apk On Cupcake

Jun 26, 2009

I was unable to install Maps.apk into emulator cupcake. I've tried 2 method, both are failure. 1. adb install Maps.apk --> [INSTALL_FAILED_MISSING_SHARED_LIBRARY] 2. Copy Maps.apk to /system/app/, com.google.android.maps.jar to / system/framework/, com.google.android.maps.xml to /etc/permissions/ Map application is still invisible, can anyone help me how to accomplish this issue. Or there's other security issue?

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Android :: Fail To Create A New File On A Sdcard

Nov 12, 2009

I do not know what is cause of failing to create a new file on a sdcard of G1, the code is below:
File temp = File.createTempFile("test", ".temp", Environment.getExternalStorageDirectory()); and the permission of sdcard is: d--rwxr-x.

Also fail if I try using the code below:
File file = new File(Environment.getExternalStorageDirectory (),"media.temp"); file.createNewFile();

Giving out about Parent directory of file is not writable.

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Android :: Why Does StartActivity Work In One Method And Fail In Another

Aug 17, 2010

I'm struggling to understand why startActivity runs properly when copied from a tutorial I found and fails when I make the smallest change.

Code from the tutorial:

CODE:........

That works. When I try to change it to what I would consider a simpler design, I am getting an error.

CODE:........

The error is: The constructor Intent(FirstTwoApps.ButtonHandler, Class) is undefined

Notice that all I did was moved the action from the handleButtonClick() method to the onClick() method. Apparently that is not allowed, but I don't understand why.

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Android :: Fail Ecclipse When I Click On Layout Tab / Fix It?

Nov 18, 2010

When i create android project in Eclipse(Helios) and open for example main.xml and click on layout view - program closes. If i start eclipse over again and try click in project view on main.xml it happens again.

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Android :: SIPDroid Fail To Connect / Solution For This?

Apr 8, 2010

I have installed Sipdroid into my android emulator 2.1. And i created users in Asterisk server. Then added the user account and password and other infor (like IP of Asterisk) into Sipdroid account (in emulator). But it could not connect to the server, it always fail to connect.

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General :: Fail To Install Android On W700?

May 25, 2014

I try to install Android on my Acer W700 by follow the guide on this site but it always failed at "Creating filesystem with parameters"....

I tryed with different version of android and install the lat version of BIOS but it's never work...

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Android :: Froyo Only Support Application Uploading Fail

May 26, 2010

I make application using Froyo SDK.It support only Android 2.2.It is working well on Emulator and Nexus one.but android market uploading error like below.The file is invalid: W/ResourceType(12468): Bad string block: last string is not 0-terminated ERROR getting 'android:label' attribute: attribute is not a string value.If change android:minSdkVersion to 7, then no uploading error.But application only support Froyo.

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Android :: Pandora Fail To Load Songs And Lockup

Jul 31, 2010

Dunno what's going on. When I first got my phone Pandora was flawless. Then after awhile it would fail to load songs and lockup (I'd have to kill the process and restart Pandora to get it to work again). Then it got to the point where it would randomly stop mid-song and just skip ahead on its own or fail completely. Now it won't even load. None of my stations load at all. I'd rather not have to resort to using a different service, since I have my Pandora stations setup nearly perfectly

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