Android :: Custom Content Provider - OpenInputStream() OpenOutputStream()
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 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 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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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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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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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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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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May 26, 2009
Can i pro-grammatically get a list of content providers extant on the system?
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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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Feb 2, 2009
I am performing hundreds of calls to a single content provider to perform various insertions, updates and deletions. After profiling my application, I have noticed that the ContentResolver class takes approx. 30ms to retrieve the corresponding content provider object for each call. Is there anyway to retrieve a reference to the content provider rather then going through the ContentResolver every time?
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Dec 21, 2009
I have written the following content provider, but when I try to pull information from it into an array,I presume its something to do with my naming of the CONTENT_URI or something? I'm not quite sure how it works so could anyone explain a bit and spot what I have done wrong?
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Jul 14, 2009
I want to delete Downloads provider data. And I have added permission in AndroidManifest. xml,But it doesn't work, the log gave me a pid and an uid, I guess the problem is caused by these two ids.If it's true, what can I do to solve this problem.
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Mar 31, 2010
I'm making a media player, but my code doesn't show all my playlists and for many others it does not show any.Why doesn't the code below work completely?
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Oct 21, 2009
The Content Provider starts when the first applicable URI is resolved. This will make the ContentProvider run forever and there doesn't seem to be a way to stop it (such as due to inactivity etc).It would be nice if Content Provider would stop after some time so that the memory usage is reduced (An enclosing process, doesn't need to be alive if the Content Provider is not needed anymore).
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Mar 21, 2010
Does anyone know if there is documentation explaining the SMS content provider?
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Jan 21, 2010
I was wondering if anyone has any information on accessing the Gmail content provider. It doesn't seem to be officially supported in the API but it looks like people are able to do this regardless. See the SlideScreen app which notifies you of new e-mail and even shows you info (sender, title).It would be great to know how this is accomplished, for example we could create a home screen widget that shows you your last few e- mails, etc.
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Aug 9, 2010
I have a doubt about content provider. Why we use content provider? can't we use database of a application? If we talk about other application also. can't we use database of that application directly wihout content provider?
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Aug 13, 2010
I created SQLite base with 3 tables and custom ContentProvider. I had a crash on first call method query. I tried to get cursor from base via db.query(table, columns,...) it worked correctly.
The exception is android.database.sqlite.SQLiteException: no such column: modified: , while compiling: SELECT items._id, items.name FROM items ORDER BY modified ASC
The method is below:
CODE:..............
The Log is 08-13 11:49:59.471: ERROR/AndroidRuntime(5237): Caused by: android.database.sqlite.SQLiteException: no such column: modified: , while compiling: SELECT items._id, items.name FROM items ORDER BY modified ASC
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Jul 22, 2010
When I send an SMS on my Android emulator, it goes to the content provider:
content://sms/sent
right?
So I wanted to get the last sent SMS from the content provider. So I used this Uri as you can see above, and, I used the method query, with the Content Resolver Object. And I got the cursor, and used the movetofirst() method, so I would have the last sent SMS. Check the code below. I hope it helps.
package com.sys;
CODE:...................
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Sep 28, 2010
I am developing an application that involves some sensitive user information. I retrieve this information via a private web API. I am trying to determine the best way to get this data into my app. Right now I'm exploring creating a content provider that can do so; my hesitation is in making it secure. I want this data to be usable only by my application. Ideally, no other apps would even know it exists.
Do you have any pointers or advice on how to do this effectively and securely? Any info on content providers who's data source is a remote OAuth'd API?
I say content provider, but if that isn't the best way to do what I need, by all means let me know what else to look into.
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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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Dec 15, 2009
In my application, I have created a ContentProvider. Is there a way for me to instantiate this ContentProvider when my apk is started? RIght now, the ContentProvider only instantiates when someone does a query.
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Jun 30, 2010
when writing a ContentProvider I have to implement the onCreate()-method, in which I establish my database connection. But to write the changes I made to the database I have to close the database on some point. Does something like a onDestroy()-method exist for ContentProviders or is there some intent I have to listen to, which is fired before killing my process?
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Aug 19, 2010
I am developing an app and get confused about the idea of Service and Content Provider in Android. In practice, what will be the difference between them? Content Provider is a facade and it defines a way to share data among applications. You many attach a local database to your app or create Content Provider mapped to a universal database so that all the application on the same device can share it. Service is long running processes that need to be decoupled from main activity. It has local and remote service. local service is like the local database, and remote service is like Content Provider sharing the database info.
What My App is doing? downloads info. from multiple internet resource in the background (I suppose this will be Service) and store the info. into database, and multiple applications will need to retrieve the data, format them and output them to user (I guess it will be a Content Provider). What will be the fine line between Service and Content Provider? Newbie in Android
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Sep 16, 2010
My app has one activity and one ContentProvider, the activity is simple in that it's just a splash screen at the moment with no other logic in it (I do intend to have more activities in the app). The ContentProvider uses SQLite as a back end and loads some static data from files on first install, a slow process due to file sizes and database initialization. My problem is that I want the activity to show up as soon as the install starts and maybe display a progress bar or dialog to show the user progress about the install. At the moment I get a blank (white) screen while the ContentProvider is initialising the data which takes quite a long time and I get "Activity idle timeout for history record" warning in LogCat. My splash screen only shows when the Content Provider is done, from the app standpoint this is undesirable behaviour. One potential solutions would be to manually start the provider via an AsyncTask but I have a feeling that this is a bad approach due to the fact that if the activity is interupted and restarted while the install is underway and a new AsyncTast is created through the activity's onCreate() then I'll have worst problems on my hands. Is there a way to start the content provider in the background and display my splash screen activity straight after the app is started? Note that this problem is only an issue on first install.
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