Android :: Way To Write ContentProvider For Content Not Stored In File Nor DB?
Jan 7, 2010
I'm writing a ContentProvider that will provide content that is not stored in a file or database.I understand hat I have to overwrite openAssetFile() method.My problem is that I don't know how to create AssetFileDescriptor from data in memory (byte array or stream).Can anybody please point me to the right direction?I was digging in Android source where they use MemoryFile but I can't obtain ParcelFileDescriptor from MemoryFile.
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Aug 12, 2010
I need to write a ContentProvider to provide a dynamically generated audio stream to be playable by MediaPlayer. That is MediaPlayer will use ContentResolver.openInputStream() to play it. I have read a lot of discussions about this problem but no one had a solution yet. The most recent one was in January 2010: http://groups.google.com/group/android-developers/browse_thread/threa.
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Oct 20, 2010
Please direct me to a description of the techniques that the ContentProvider employs to access data. I am trying to understand how it works as well as what is tunable or even if its meant to be tunable. It the memory management tiered, cached, virtual, flat? Is it file based, shmem based, stream based? Can there be a combination thereof?
Any information, suggestions, or references are welcome. The android fundamentals page says: "The data can be stored in the file system, in an SQLite database, or in any other manner that makes sense;" but the android ContenProvider page barely skins the onion.
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Jun 13, 2010
I'm now trying to implement my own content provider. My original data was stored on network or local/remote file systems, so I want to provide data via input stream. I know that client may call ContentResolver.getnputStream to retrieve the input stream to access data. But I don't know how to implement content provider in this situation, I searched the Internet but all the tutorials for content provider are talks about how to expose data that stored on local database. how to expose data that stored on file systems using a content provider? what happened when client call ContentResolver.getnputStream? I want to know how to return an input stream to my client.
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Mar 16, 2010
I am now reading contentProvider.java( under the base/core/java/android/content)
Ln 127 looks following:
CODE:..........
I'm really confused about that contentProvider invoke this.query()
CODE:.................
where is it implement? How can i find it? anyone can tell me?
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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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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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Jul 5, 2010
How can I open them which have already stored in SQLite?
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Sep 10, 2010
I have valid JPG files and now I want to load them into a layout containing an ImageView. I have code to findViewId(R.id.myimage). I followed some sample code using File but it did not work. The file is stored at /data/data/com.myapp/files/someimage.jpg.
What is the easiest and efficient way to load and display?
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Nov 8, 2010
in my application I have strings.xml file under values folder. strings.xml file contain array. Now I want to add element to that array at runtime. How to do that?
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Apr 4, 2009
I would like to know how to write to file. I have tried using OutPutStream out = new FileOutPutStream(fileName); out.write(byte [], 0, length);This way always returns Parent directory or File is not writable.I have also used openFileOutPut(fileName, MODE_PRIVATE) method but this method works properly if it is called from the same class which has extended Activity and I am writing to the file in different class and that too in different thread.I have tried to get the Application Context through getApplciationContext and call openFileOutPut method but still theres something wrong that I am doing.So please can someone suggest me a proper way to write to a file.
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Nov 21, 2010
I am trying to write an XML file to a url e.g. http://myIPAddress/myFolder/myFile.xml
I am using an Apache2 server for my tests on Ubuntu 10.10
Output line example (ignore apostrophe):
<'myEntity id="1" name="me" />
Also, i want to able to reopen the connection anytime and add lines to the end of the file.
I'd post my attempt here for correction but it's a sad one.
I am trying OutputStreamWriter with URLConnection, please correct me if i should be using a different approach.
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Jul 19, 2010
As the title, I create a ByteArray to store the file in blob like this:byte[] red_buf = myCursor.getBlob(1);
But I don't know what's the next step to open the file.
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Jul 19, 2010
As the title, I create a ByteArray to store the file in blob like this: byte[] red_buf = myCursor.getBlob(1);And I wanna use FileOutputStream to open.But I don't know how to do. Can anyone give me a example or website please?
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Jun 23, 2010
I have several files stored in my project /res/values folder, is there any way to open and read these files from my android application? Each file contains text informations about one level of my game.
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Jul 31, 2010
I am currently making an app which works with images. I need to implement functionality where the user picks a file stored on the SD card. Once they pick the picture (using the Android gallery), the the file-location of the image will be sent to another Activity, where other work will be done upon it. I have seen similar posts here on SD, but none to answer my question specifically. Basically this is the code I am doing when the user clicks the "Load a Picture" button:
// Create a new Intent to open the picture selector:
Intent loadPicture = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// To start it, run the startActivityForResult() method:
startActivityForResult(loadPicture, SELECT_IMAGE);
From that code, I then have a onActivityResult() method to listen to the call-back:
// If the user tried to select an image: if(requestCode == SELECT_IMAGE) {
// Check if the user actually selected an image: if(resultCode == Activity.RESULT_OK) {
// This gets the URI of the image the user selected: Uri selectedImage = data.getData();
// Create a new Intent to send to the next Activity:
Intent i = new Intent(currentActivty.this, nextActivity.class);
// - Problem Area -
// I would like to send the filename to the Intent object, and send it over.
// However, the selectedImage.toString() method will return a
// "content://" string instead of a file location. How do I get a file
// location from that URI object? i.putExtra("PICTURE_LOCATION", selectedImage.toString());
// Start the activity outlined with the Intent above: startActivity(i);
As the code above states, the uri.toString() will return a content:// string instead of the file location of the selected picture. How do I obtain the file location?
Another possible solution is to send over the content:// string and convert that into a Bitmap (which is what happens in the next Activity). However, I don't know how to do that.
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Sep 23, 2009
In android am using the SDK 1.5 am using the Database concepts to create the Sqlite Db file but i don't know where the file is stored. any one help me to find that Db file in my system please.
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Apr 2, 2010
Does somebody knows where the file with the actual stored SharedPreferences is located?
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Aug 11, 2012
Here is what I am trying to do:
- have a database that contains a word, and the name of an image file associated with that word.
- the words from the database will be displayed in a listview
- when the word is selected, a new activity will start displaying the word and the image in an image view.
Would it be best to store the terms in an array and have the list view populate from this array and then pull from the database onitemclick? Or can the list view be populated with the terms from the database?
Will android be able to display the image if the name of the file is stored in the db?
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Mar 17, 2010
I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. How my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. CODE:..................
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Apr 30, 2010
im just trying to save some text to a file on android and while it works fine on the emulator "dont crash", when i try it on my phone it crashes, what am i doing wrong?i do know it crashes on " File root = Environment.getExternalStorageDirectory(); " i just dont know why. showMes() is just a function to make toast.
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Sep 26, 2010
This should be trivial, but for whatever reason I can't find any easy way to do this. Coming from C# where this is a 1 line call, I don't understand why Java makes this so complicated, and on top of that android leaves even that out of its libraries. Anyway all I want to do is write an
org.w3c.dom.Document
that I have populated to a xml file. It should be as easy as opening a stream and writing document.toString(). But that doesn't work. My hope is I'm just missing something.
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Apr 17, 2009
I wrote a file to the sdcard, but it failed as follow:String sdcardFIle = "/sdcard/xxx.txt" FileOutputStream fos = openFileOutput (sdcardFile, Context. MODE_ WORLD_ WRITABLE ) ; openFileOutput failed, because fIle "/sdcard/xxx.txt" contains a path seperator. It is so strange. Is there another way to handle the situation?
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Mar 31, 2010
I'm trying to save a file in a subdirectory in Android 1.5.I get a exception saying I can't have directory separator in a file name ("/"). I'm missing something of working with files in Android..I thought I could use the standard Java classes but they don't seem to work.I searched the Android documentation but I couldn't fine example and google is not helping me too.I'm asking the wrong question (to google).
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May 27, 2010
i'm having this issue of not being able write text file into the SDCard. I'm running the program through eclipse on a HTC magic version 2.1. i had the USB cable unplugged before i run the program. It says that the parent directory of file does not exist: data2/ abc.text
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Jul 3, 2010
Today, i tried to read and write file on the android. but it seems that file write mode is only provided for SD card? most of article is asked about SD card written. Is there no way to save data internal side?So when i install the application to real device. then its application installed in SD card or internal space? because we have make it log file from our application for everytime while application run.So, how do we write the file to SD card and specified the absolute path where we saved? to load this file.
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Dec 14, 2009
I'm trying to create a file on the sd card.but that throws a FileNotFoundException. Isn't OutputStream supposed to create the file, if not found on disk? I'm looking to write image data there.This is on a 1.6 emulator. I have an SD card installed, I'm looking at the sdcard folder through DDMS, so it's there.
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Jan 21, 2010
Might sound crazy, but it's what I need to do. I want to take a Bitmap object and use the XMLPullParser/XmlSerializer to write this to a flat file. Obviously I will need to read the XML tag back into a Bitmap object.So somehow I have to turn my Bitmap into a String and then turn that String back into a Bitmap. I will do some searches on Base64 to see if I get any good examples.
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Jul 6, 2010
M trying to write a file using openFileOutput, using the following snippet: I have to use this file, myfilename.text, later in my native code. To reference it I must know it's path. Anyone knows where does openFileOutput create the file and if it can be opened in my native code using the path, as in would there be any permission issues. Code...
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Feb 10, 2010
How to play audio from a stream in android? I will get input stream from an online link( like continuous FM). I need to cache the stream and play it. I searched a lot in sites,,,but didnt get.They show option of playing from a stored file. There is no option to play from a stream.
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