Android :: Cleaning An Image Cache Directory On SD Card?

Apr 1, 2010

I've got an app that is heavily based on remote images. They are usually displayed alongside some data in a ListView. A lot of these images are new, and a lot of the old ones will never be seen again.

I'm currently storing all of these images on the SD card in a custom cache directory (ala evancharlton's magnatune app).

I noticed that after about 10 days, the directory totals ~30MB. This is quite a bit more than I expected, and it leads me to believe that I need to come up with a good solution for cleaning out old files... and I just can't think of a great one. Maybe you can help. These are the ideas that I've had:

Delete old files. When the app starts, start a background thread, and delete all files older than X days. This seems to pose a problem, though, in that, if the user actively uses the app, this could make the device sluggish if there are hundreds of files to delete. After creating the files on the SD card, call new
File("/path/to/file").deleteOnExit(); This will cause all files to be deleted when the VM exits (I don't even know if this method works on Android). This is acceptable, because, even though the files need to be cached for the session, they don't need to be cached for the next session. It seems like this will also slow the device down if there are a lot of files to be deleted when the VM exits. Delete old files, up to a max number of files. Same as #1, but only delete N number of files at a time. I don't really like this idea, and if the user was very active, it may never be able to catch up and keep the cache directory clean.

Android :: cleaning an image cache directory on SD card?


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Android :: Mkdirs Returns False For Directory On Sd Card While The Parent Directory Is Writable

Oct 31, 2010

At some points while running my android application, I need to create a directory on the sd card, for a small number of users this fails and I can't figure out the reason for it... (I've found similar problems caused by the WRITE_EXTERNAL_STORAGE permission missing, it's there and it works for almost all users so I don't think this is reason) When mkdirs returns false I crash the program and log the following java.io.File properties, starting at the directory I want to create, then recursive printing properties of the parent directory and so on...

/sdcard/MyDirectory/Dir1/Dir2 (exists: false, canWrite: false, isDirectory: false, isFile: false);
/sdcard/MyDirectory/Dir1 (exists: true, canWrite: true, isDirectory: true, isFile: false);
/sdcard/MyDirectory (exists: true, canWrite: true, isDirectory: true, isFile: false);
/sdcard (exists: true, canWrite: true, isDirectory: true, isFile: false);
/ (exists: true, canWrite: false, isDirectory: true, isFile: false);

The strange thing is that the parent directory is writable (canWrite=true), I can't print the execute file permission but from what I've read, write is what you need when creating directories... What I've looked at so far is the WRITE_EXTERNAL_STORAGE permission, if the sd card is full and if the sdcard is mounted read only:...........................

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Android :: Android - Image Cache Stategy And Memory Cache Size

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I'm implementing an image cache system for caching downloaded image.

My strategy is based upon two-level cache:
Memory-level and disk-level.

My class is very similar to the class used in the droidfu project

My downloaded images are put into an hashmap and the Bitmap objet is wrapped inside a SoftRererence object.

Also every image is saved permanently to the disk.
If a requested image is not found into the Hashmap<String,SoftReference<Bitmap>> it will be searched on the disk, readed, and then pushed back into the hashmap. Otherwise the image will be downloaded from the network.

Since I store the images into the phisical device momery, I have added a check for preserve the device space and stay under a 1M of occupied space:

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

This method is called sometime afte a disk writing:

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

What I'd like to add is the same check on the HashMap size to prevent it will grow too much. Something like this:

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

My question is:
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Android :: Updating Image In Drawable Directory From Code Possible?

Mar 17, 2010

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Android :: Creating A Directory On The SD Card?

Oct 4, 2010

I am trying to have my app create a directory on the root of the SD Card, if that directory does not already exist. When I run the app, the "Creating Home Directory..." toast notification displays, but the directory is not created... What am i doing wrong?? (P.S. permissions are set for writing to external storage)

CODE:.......

Here is my Manifest file:

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

I tried this as well, it didn't work, but it might be a step in the right direction as it creates the directory and populates it with a file from res/raw all in one step:

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

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Android :: How To Delete Directory From SD Card On Uninstall?

Jul 14, 2010

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Android :: Create Directory Automatically On SD Card?

Jan 25, 2010

Im tyring to save my file to the following location FileOutputStream fos = new FileOutputStream("/sdcard/Wallpaper/"+fileName); but im getting an exception java.io.FileNotFoundException

But when I put the path as "/sdcard/" it works.

Now im assuming that Im not able to create directory automatically this way.

How to create a directory and sub-directory via code.

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Android :: Get A List Of Files From A Directory On Sd Card?

Sep 15, 2010

I'm happy reading and writing to a pre-set file, and could manually populate a listview, but I'm hoping there is an official(or not) filebrowser I missed, or other more elegant solution to present the user with a directory listing, and let them select a file.

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Android :: Get A List Of All Mp3 Files On The Sd Card Regardless Of Directory?

Jul 10, 2010

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CODE:........

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Android :: Create Directory On The SD Card And Copy Files From - Res - Raw

Oct 3, 2010

I am trying to create a folder and several subdirectory within it on the SD Card... I then want to transfer files that I have stored in /res/raw to that folder... I addition, I want this to only happen once, the first time the program is ever run. I realize that this is ridiculously open-ended, and that I am asking a lot...

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Android :: Limit For The Number Of Files In Directory On An SD Card?

Apr 16, 2010

I have a project written for Android devices. It generates a large number of files, each day. These are all text files and images. The app uses a database to reference these files.

The app is supposed to clear up these files after a little use (perhaps after a few days), but this process may or may not be working. This is not the subject of this question.

Due to a historic accident, the organization of the files are somewhat naive: everything is in the same directory; a .hidden directory which contains a zero byte .nomedia file to prevent the MediaScanner indexing it.

Today, I am seeing an error reported:

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

Regarding the sdcard, I see it has plenty of storage left, but counting

$ cd /Volumes/NO_NAME/.hidden
$ ls | wc -w
9058

Deleting a number of files seems to have allowed the file creation for today to proceed.

Regrettably, I did not try touching a new file to try and reproduce the error on a commandline; I also deleted several hundred files rather than a handful.

However, my question is: Are there hard limits on filesize or number of files in a directory?
am I even on the right track here?

Nota Bene: The SD card is as-is - i.e. I haven't formatted it, so I would guess it would be a FAT-* format.

The FAT-32 format has hard limits of filesize of 2GB (well above the filesizes I am dealing with) and a limit of number of files in the root directory. I am definitely not writing files in the root directory.

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Nov 24, 2010

I created a bitmap and now i want to save that bitmap to a directory somewhere. Can anyone show me how this is done.

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

WANT TO SAVE _bitmapScaled to a folder on my SD card

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I don't see anything about this change in the API differences report at http://developer.android.com/sdk/api_diff/8/changes.html. However when my Nexus One started running Android 2.2, the list of files created by the following code are now in reverse alphabetical order rather than alphabetical order (as they were with Android 2.1 and earlier, AFAIK):

CODE:.........

The line "Arrays.sort(fn);" revives the alphabetical order of the list, but sorts are computationally expensive and AFAIK the explicit call to Arrays.sort() was unnecessary prior to Android 2.2.

In addition to seeing this order change on the Nexus One, it can be confirmed on the emulator running level 7 and level 8 AVDs.

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Oct 24, 2010

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Android :: Avoid DDMS Timeout When Pushing Large Directory To Emulated SD Card?

Mar 23, 2010

I have a large directory (about 700 MByte) I'm trying to push to a 4 GByte emulated SD card (in a Platform 2.1 AVD) by dragging and dropping the directory onto the ddms file explorer's /sdcard directory, but ddms is timing out after about 20 MByte of pushing. The following command line error message appears:

34:05 E/ddms: ADB rejected shell command (ls -l /) Failed to push the items: timeout

When ddms is connected to an actual device (Nexus One), the same drag and drop operation successfully completes.

I looked but didn't see any mention of timeout control options in the ddms documentation at http://developer.android.com/intl/de/guide/developing/tools/ddms.html or the Dev Tools application running on the emulator. Has anyone experienced this or have a tip to fix it?

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Jun 2, 2010

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Aug 24, 2010

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Nov 14, 2012

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May 2, 2010

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My phone is currently rooted.

Samsung Galaxy; Exhibit
SGH-T599N
Complete phone specs: [URL] .....

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