Android :: Possible To Write Custom Content Provider For Existing System Database?
Dec 9, 2009
Not sure of the absolute utility of this but seems as though it should be possible and useful. Can you extend ContentProvider to provide URIs representing new queries (i.e., joins across multiple tables not specified by existing URIs) for an existing system database? The alternative seems to be that I need to write a series of cursor queries then join them -- seems like a lot of unnecessary code duplication.
I have been trying this for the contacts database as an exercise, but no love so far. The crux seems to be that I cannot open a database in another package during the setup phase. Am I just completely out in left field here? It's possible as I am new to both Java and Android.
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Mar 11, 2010
how can i create a custom content provider like contact content provider? i know how to create custom content providers but i want to integarte to device such a way that it canbe accessed by all application installed in that device.
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Mar 16, 2009
Has anyone got an example of how to write a ContentProvider that gets its data from somewhere other than a SQLLite database? Mine is half working, in so much as I can retrieve the requested data and apparently populate a MatrixCursor, but I can't figure out what I'm supposed to do with the 'projections' parameter supplied to the 'query()' method.
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Nov 22, 2010
Since I've seen a presentation from Google IO I'm a bit confused in the question, if it's better to use content providers or databases. Or it makes no difference if I don't want to share any data with other applications.
If I've understood it right, content providers based on SQLite DBs and it's also possible that content of them is only accessable for my application.
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Sep 4, 2009
I am writing a content provider for this application and in my content provider I am opening a database connection, running a query and returning the cursor of results to the calling program. If I close this database connection in the provider, the cursor has no results. If I leave it open, I get "leak found" errors in my DDMS log. What am I missing here? What's the clean, proper way to return a cursor of database results?
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May 26, 2009
Can i pro-grammatically get a list of content providers extant on the system?
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Oct 8, 2010
I want to get a code of content provider which a database is created. I am using the tool which located here tools/sqllite3.exe to check if the database is created.Please let me know the step by step procedure for this thing.
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Jul 28, 2010
i have done SQLite database programming for Android, but i dont know anything about Content-Provider except this: "As i have referred Android Developer page , Android SDK explained about "Content-provider" as it is used to store and retrieve data." What is the exact difference between "Content-Provider" and "SQLite Database"?Which is best to store data, when ?
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Aug 7, 2010
I understand, at least on paper, the basic difference between the Content Provider and just directly accessing the SQLiteDatabase. I have a functioning prototype for my application, and currently it is just directly hitting the database. I don't really have any experience using the Content Provider pattern, but I have found out that I will need to share some data with another application.
I will only be sharing about 2 out of a dozen or so tables, so I was wondering if I should be just completely redoing the data layer to follow the Content Provider pattern, or just expose only those tables via a Content Provider for the sake of the other application and still directly access the database in the primary application.
One of the issues I ran into with my prototype was that I have some fairly complex transactions, and the code I wrote to get that working is not designed particularly well and isn't reusable at all. As I add more functionality to this app, I'm going to need a better designed data access layer, before I set off writing my own, does anyone know of any good resources with design patterns for this type of thing already? Also, if I need to go the Content Provider route, am I going to have solid control over the database transactions?
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Mar 1, 2010
I am having a hard time understanding content providers. In the notepad example and others, the content provider never even declares its CONTENT_URI anywhere inside itself, yet the docs say to publicly declare this. It's declared in a different class. So when an activity queries a content provider with a CONTENT_URI, how does Android know which one I want. I see no link between a content provider and its CONTENT_URI declared in another class.
I also don't how to think about intents and content providers. I know that you don't call an intent on a content provider. But an activity queries a content provider without an intent, and an activity has a mimetype attribute in the manifest that would seem to tie it to a content provider.
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Aug 10, 2010
In my app i need to read the data at a content provider before the system actually initializes. Probably what i understand is that a boot complete intent would launch a homescreen activity.Exactly before the system initialized i want to see the data provided by the content provider and use it.
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Jun 8, 2010
How can I make a custom content provider in android?
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Nov 2, 2010
What are advantages of using custom content provider? Why such content provider is superior of plain class that wraps SQL queries?
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Oct 21, 2009
Is it possible to create a custom ContentProvider to
* access android existing database (e.g. Contacts, SMS)?
* extend an Exciting ContentProvider which has access to android existing database (e.g. ContactsProvider to access Contacts DB)?
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Jan 27, 2010
The content provider / resolver APIs provide a complicated, but robust way of transferring data between processes using an URI and the openInputStream() and openOutputStream() methods. Custom content providers have the ability to override the openFile() method with custom code to effectively resolve an URI into a Stream; however, the method signature of openFile() has an ParcelFileDescriptor return type and it is not clear how one might generate a proper representation for dynamically generated content to return from this method. http://stackoverflow.com/questions/1542008/returning-a-memory-mapped-inputstream-from-a-content-provider
Are there examples of implementing ContentProvider.openFile() method for dynamic content in the existing code base? If not can you suggest source code or process for doing so?
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Mar 9, 2010
I created a custom content provider in one android application following all guidelines from developers.android.com and an activity in same application with an edittext and a button. when ever i enter any integer value and click on the button, using custom content provider am inserting value to a sqlite database this worked fine. but when i created another application and tried to access the custom content provider by importing custom provider class am getting the following exception:
W/dalvikvm( 418): VFY: unable to resolve static field 29 (CONTENT_URI) in Lcom/ mypack/android/mycontentprovider/MyProvider; W/dalvikvm( 418): VFY: rejecting opcode 0x62 at 0x0047 W/dalvikvm( 418): VFY: rejected Lcom/mypack/android/ appwidgetsettingstest/Test Activity;.onCreate (Landroid/os/Bundle;)V W/dalvikvm( 418): Verifier rejected class Lcom/mypack/android/ appwidgetsettings test/TestActivity; W/dalvikvm( 418): Class init failed in newInstance call (Lcom/mypack/ android/ap pwidgetsettingstest/TestActivity;) D/AndroidRuntime( 418): Shutting down VM W/dalvikvm( 418): threadid=3: thread exiting with uncaught exception (group=0x4 001aa28) E/AndroidRuntime( 418): Uncaught handler: thread main exiting due to uncaught e xception E/AndroidRuntime( 418): java.lang.VerifyError: com.mypack.android.appwidgetsett ingstest.TestActivity E/AndroidRuntime( 418): at java.lang.Class.newInstanceImpl(Native Method ) E/AndroidRuntime( 418):.......
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Jun 29, 2009
I been using custom adapters based on the BaseAdapter and I usually populate my data at the getView() funtion.
Now I'm trying to write my custom adapter for my database cursor which now will be based on a CursorAdapter.
I'm getting confused where I should do the populating work? Along with how do I implement my inflating and populating "smart/efficient code based on RomainGuy presentation."
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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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Feb 9, 2009
Is it possible to write data or create folder in system directory like /system/media/audio/alarms. i.e other than our respective package.
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Aug 23, 2010
I want to add new nodes to the exiting xml file in android to save imageurl so plz help to find a solution to add new nodes to existing xml file, so that i can use the xml data later..
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May 20, 2010
I recently started Android programming and was working on my first program which displays a historic text document, sectioned by tabs via TabHost.I have limited my program to one activity and merely used setContent in my TabSpec's to switch between different XML views.The document has both unedited and corrected versions of the text for which I have built text views to accommodate. I wanted to implement the standard menu to have buttons to "view corrected" and "view original" and switch the content of the tabs which have changes (without altering the tabs or their indicators).I've read on the TabHost API and there is no way to edit existing tab content with setContent() of TabSpec; and AFAIK TabWidget only affects the actual tabs, not the content that is displayed upon pressing them.I've thought about creating a new class which extended TabHost and super() all of the original methods, while including one more which updated the mTabSpec list.
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Nov 16, 2009
Since the TabHost API does not offer a way to change existing views or activities, what is the preferred means to replace an existing tab?
I only know of: clearing the tabs and adding them again. Is there an alternative? Or is this really not provided by design?
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Dec 29, 2009
I'd like to be able to read the system's SMS content provider. Basically I wanted to make an SMS messaging app, but it would only be useful if I could see past threads etc.It seems like there's a content provider for this, but I can't find documentation for it - anyone know where that is?
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Jun 4, 2010
my android application is handling a large database of bus passage time and we would like to allow others application to be able to display certains bus passage time. We would like to use a content provider to do that. Most example seems to be about using an SQL database, but we use some custom text file. I was wondering what would be the best way to do that. I was thinking I could use a Content Provider and implement the Cursor interface on a custom object that I would manually fill with my text data. Would this be possible ? Anyone have a better idea (excluding changing to SQL lite of course)?
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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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May 13, 2010
I have already having 2 tables in a database now i want to create a new table in that database it self how can i create?
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Sep 2, 2009
What content providers in the cupcake android build do apps have access to?
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Jan 21, 2009
1. How do i use the content provider defined to interact with an application. I mean the database defined is for use in the program only, then how can i use this content provider from another program.
2. Is there an example depicting using of content providers. How are the content providers accessed else where so tht he databases defined in it be created at run time.
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Jul 1, 2010
Im having problems with the content provider. Im trying to create a content provider.Is my URI parse been parse correctly?this leads to my database as I want to extract data from it and show it in the list view.after which, i have to edit the manifest inserting the provider if I extend my class to ContentProvider, my database file will be kinda screwed up, is there an easier way?however, it shows the error of not having the one.two.databases to exist.
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Sep 10, 2009
I would like to know the exact difference between Content provider and SQLiteDatabase. If we have to share our data among applications then we use Content provider, otherwise SQLiteDatabase. Is this is the ONLY difference, OR using Content Provider has something to do with performence?
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