Android :: How To Refresh MediaStore On Android?
Jul 21, 2010
Android has a service - MediaScanner - which runs in the background any time (I believe) the SD card is un-mounted and re-mounted. This service collects data on all the media files on the card, and provides a SQLite DB which can be queried by music applications. Most music applications use this service as it saves on battery-drain associated with scanning the SD card.
Since I started using android, I've consistently had a problem whereby M3U playlists synchronised to the device remain in this SQLite DB even after being deleted from the SD Card. It's gotten to the point where I now have a collection of about 40 playlists showing up in any music app I use, despite there only being around 10 m3u files on the card. The remaining playlists do not play, and are empty. I can remove them manually by deleting them from the music app, but I'm sick of doing this. There has to be a better way to remove these ghost playlists...............
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May 3, 2010
After implementing some Android Apps, including several Map activities, I try to refresh the activity when the GPS listener's onLocationChanged() mehtod is called. I have no idea how to tell the map activity to refresh on its own and display the new coords. the coords to store will have to be in global values, so that the location listener will have access to it. In my sample GPS-class (see code below) I just changed the text of a text view....but how to do that in map view?
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Feb 16, 2010
How can I get the album art from MediaStore?
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Sep 27, 2010
I'm trying to query the Android's MediaStore.Images.Media to get the images contained in the device. I get my cursor on the DB like this: Code...
and I get the indices of the columns this way:
int dataIdx = cursor.getColumnIndex(DATA); ... int idIdx = cursor.getColumnIndex(MediaStore.Images.Media._ID);
unfortunately it seems that the column index idIdx is always -1, which means the column doesn't exist. Am I doing something wrong? Is there anyone else experiencing the same?
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Feb 14, 2009
If I pragmatically store new media files on the SD card, the MediaStore does not know about them until I remove and reinsert the SD card. Is there a way to tell the MediaStore to rescan the SD card without first unmounting the SD card?
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Jun 17, 2010
For example if a have two directories /sdcard/Music/Music-1 and /sdcard/Music/Music-2 how can i construct uri to get the files in Music-1 dir for example. I can use MediaStore.Audio.Media.EXTERNAL_CONTENT_URI to get the content of all external storage but how to do the trick only for specific dir.
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Aug 13, 2010
I have an app that allows the user to take and save a new picture using the Intent ACTION_IMAGE_CAPTURE. After the user accepts the newly taken picture, I create a ContentValue object to set the picture information, and then I insert the picture into the MediaStore and send a broadcast so that the user can see the photo when opening a picture viewer app such as gallery:
ContentValues newImage = new ContentValues(3);
newImage.put(Media.DISPLAY_NAME, mPicName);
newImage.put(Media.MIME_TYPE, "image/png");
newImage.put(MediaStore.Images.Media.DATA, path);
mPictureUri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, newImage);
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, mPictureUri));
All of this code works fine. The photo is correctly saved, and I can view the photo using gallery. The problem is that when I view the photo in gallery and select "Details" it shows the photo name as "null." And yes, I know for a fact that the variable mPicName above is not null and always has the correct value.
The odd thing is that, when running my app on my Droid running Android 2.1, when I choose to copy files to/from the phone and my computer, I open up the Droid on my Windows computer, and when I go into my app's created folder for photos and view the new photo, the name is correct. Then, when I disable copying files from the phone/computer and go back into gallery to view the file on my Droid, the name is suddenly correct and is no longer null.
Can someone tell me why the name is null after my code runs, and why the name is correct after viewing the file on my computer rather than on the phone? Is there a way to get the name non-null right when the picture is saved? I'd bet that the name would be correct if I turned my phone off and turned it back on, but I'm not sure how exactly to get force things to work immediately.
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Oct 7, 2010
How do i get back the image taken from starting the Intent(MediaStore.ACTION_IMAGE_CAPTURE)?
I need the image to be display as a thumbnail and also be attached to email.
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Apr 17, 2010
I am using MediaStore.Images.Media.insertImage(ContentResolver cr, String imagePath, String name, String description) function to insert a newly created image into gallery. System is naming the file by default, but its different than names of pictures taken by original app(Time stamp). Is there easy way to set it up?
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Apr 15, 2010
After I've used a MediaStore.ACTION_IMAGE_CAPTURE intent to take a photo, when I try to retrieve the captured image, I sometimes get an out of memory error as shown below. The odd thing is the huge size of the memory trying to be allocated is always reported as 10,077,696 (x99c600). However, the image file is much smaller, typically around 750,000 bytes.Any suggestions on how to get around this problem? I'm testing this on a Nexus One with firmware version: 2.1-update1 and Build number: ERE27. Code...
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Jul 15, 2009
I have seen a number of posts from people who had trouble retrieving a full size image from MediaStore.EXTRA_OUTPUT with code...
Should this code work? I mean, should this result in a file containing the picture?
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Sep 30, 2009
Is that normal that Images indexed in the MediaStore do not have thumbnails generated until the Gallery app is launched and the user actively navigates to the bucket where the image is stored ?
I think it's quite odd as I thought thulbnails generation was part of media indexing.
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Feb 17, 2010
When I take a picture with Androids camera app, it detects the phone's orientation and saves the pic accordingly. So if i take a picture of a building, the roof will be on the topside, whether I hold the phone in landscape position or portrait.
However, when i use
Intent imageCaptureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
to get a picture, the camera app doesn't react to orientation. If i hold the phone vertically (portrait), the resulting pic will be rotated, with said building's roof to the left of the screen.
How can I set the intent so that the camera will take orientation into account? Or can I deduce in some way in what orientation the pic was taken and rotate it myself afterward?
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Aug 16, 2010
I'm using MediaStore.Images.Thumbnails in order to show the images the user have. But i'm not able to get an image through its path.
Is there any way to look for an image using the path? Code...
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May 7, 2010
I just don't get it: when I use the camera with an intent and also specify an output file, the returned image is always very small on many devices (e.g. Motorola Milestone 2.1, HTC Desire 2.1, Emulator 2.1, Emulator 2.0.1) but not on all (e.g. Nexus One). Here's what I do to bring up the camera app:
private final static String TEMP_PHOTO_FILE = Environment.getExternalStorageDirectory() + "/TEMP_PHOTO.JPG"; ..............
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Aug 3, 2010
I'm rather new to android programming and right now I'm playing with the media store for a personal test project. I've run into a couple double-edge problems..
I need to query the mediastore for a list of all music files, simple enough - but i need to restrict the results to certain folders only. I accomplished this (rather easily) using the SQL-*LIKE- where clauses and all's well on this aspect.
I now need a unique (if this were actually using SQL, I could simply use the DISTINCT modifier and be done with this) list of all artists. Now this is based off the songs in a given path. Therefore I cannot filter the list returned from querying the URI:MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI, and adding in where clauses based off the file path as I did in the first step.
So, what this leaves me with is using my initial query and getting a cursor back then stripping the dupes from the cursor (which is where i am now - too slow, especially with 1000+ songs) - based on a query of artists instead of songs, obviously.
Is is possible to override the actual query that fills the cursor, maybe? As in: override the query and filter how the data is initially put into the cursor (remove recursive entries) and return the proper cursor immediately? Content providers and how they were never built with a distinct function is beyond me, but whatever. Is the returned cursor from a URI query command filled in a manner that can be overridden or not? That's what I'm unclear of at the moment on this. I would like to be able to wrap the getContentResolver().query(xxx..)) command directly to remove the entries on cursor fill, if possible - i do async queries and using a single query statement (well, one for the artist query) would be great.
My other alternative thought is to just preload the data and manipulate my view's data by creating a new cursor based off the preloaded dataset (cursor) - which may be the way to go, and if so - would a cursor be the best way to store this data? Also worried about ram with larger libraries.
Maybe there's simply a way to do a DISTINCT query on the URI - I just do not know. I've seen this question (or the ilk there-of) asked many times with no good answers that were meant for a URI as opposed to a SQL back-end.
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Nov 22, 2009
Hello, I'm testing some code from a demo found in a forum and I'm getting some strange results. My goal is to be able to allow users to access the pictures on their device to choose an avatar/logo. This code run flawlessly except that I only get a handful of images on the phone. And its not even always the same images. Whats more is that it loads those images into a gridview and repeats them for what looks like a number of times equal to the actual number of images that are on the device. And on top of that if I scroll down the through the pictures, and scroll back up, it reorders the pictures from what they were previously. Each time I load the app the pictures seem to be different as well. I have around 400 pictures stored on my phone, and thats what I'm using to test. If someone could shed some light on this for me that would be great. This is my first time using a URI to access content to I'm not sure where to start troubleshooting this one. Code...
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Jan 8, 2010
I managed to figure out how to get the camara application to give me an image, but it is rather tiny, only 18k. Has anyone figured out a reliable way to get a full-sized image returned if you are using a MediaStore.IMAGE_CAPTURE intent?
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Mar 2, 2009
I got FileNotFoundException when run this
FileInputStream fileToRead = new FileInputStream(fileName);
here fileName is a string =content://media/external/images/media/6 which is got in sdcard image selection by android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI
any solution?
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Mar 16, 2009
I'd been using my own Camera class for taking images and my own database but soon enough I couldn't really keep up with changes and I decided to use the built in camera application in Android to do the job, but I can't seem to get it to save file. What am I missing here? The application seems to save the file but it's just 0 bytes. I looked up the source code of the Camera application and it's looking for the "output" in Extras to save the file.
Public class CameraTest extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);...............
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Jan 22, 2010
So our app has the option to take either a picture or a video. If the user takes a picture, we can use the MediaStore.Images.Media.insertImage function to add the new image (via a filepath) to the phone's gallery and generate a content:// style URI. Is there a similar process for a captured video, given that we only have it's filepath?
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May 1, 2010
I manage media (images, sound) of my app directly, reading and saving to the SD card. Should I be using the MediaStore instead? I'm not quite sure what the MediaStore is for, and the javadoc is not very helpful. When should an app use the MediaStore? A brief overview of the pros and cons of the MediaStore.
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Aug 3, 2010
I have an onActivityResult returning from an mediastore image selection which I can get a URI for an image using the following:
Uri selectedImage = data.getData();
Converting this to a string gives this:
content://media/external/images/media/47
Or to a path gives:
/external/images/media/47
However I can't seem to find a way to convert this into an absolute path, as I want to load the image into a bitmap without having to copy it somewhere. I know this can be done using the URI and content resolver but this seems to break on rebooting of the phone, I guess MediaStore doesn't keep its numbering the same between reboots.
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Aug 28, 2010
I am trying to find the sqlite database used by the MediaStore. As far as I understand, the MediaStore contains amongst others the playlists defined in the default Music app. I actually would like to duplicate a playlist, but the app does not allow that. Somehow I thought I could fix this if I just could find the actual db file. But I got completely sidetracked now, because I just cannot find the db. Btw, I am running FroYo.
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Jul 22, 2009
What is the way to fresh an activity without calling finish- >startActivity all over again?
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May 30, 2010
Is there a way to refesh sdcard without turning off the phone?
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Oct 27, 2010
I've got a bunch of live wallpapers for sale, and have a lot of 1-star comments that just say "Doesn't open". This is because there's no launcher activity, so the open button is greyed out after download. I'm attempting to fix this by including an activity that explains what to do, and I'm trying to avoid useless app clutter by disabling that activity once they've successfully used the wallpaper. This seems to work fine, the problem is the app icon doesn't go away right away. It stays in the app drawer and if you tap it you get a "this has been disabled" message. Eventually it will be removed if the phone is rebooted or if the home app is restarted. I'd like to clean this up. Is there a way to tell Home to refresh this list, or to otherwise tell it to remove the icon from the listing? It seems a bit rude to process kill Home for this purpose, and clearly something like this happens when an app is installed/ uninstalled.
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Feb 16, 2009
I'm facing to one problem with ListView. I would like to refresh the ListView every time I change the base data.
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Sep 12, 2009
I am developing file browser to my media player UI i have written in my OnItemClickListener() in that i called the method like adapter.notifyDataSetInvalidated() method but it is not working please help me to refresh my list.based on onItemClickListener() method.
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Apr 1, 2010
I have looked EVERYWHERE and my little brain just can't understand a better way to refresh an activity. Any suggestions that I can understand would be great.Code...
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