Android :: Counting Files In A Cache
Nov 3, 2010
I'm trying to manage the files that I store in a local cache. I download files, then delete them after the total file size in the cache exceeds a certain number of bytes. What I'm shooting for right now is something simple: setting the max cache size to be 1 MB, or 1*1024*1024 bytes = 1048576 bytes. I have a method that gets the cache directory, then does a listFiles() on that File to get all children of the directory. I have a flat cache structure, no subdirectories, so simply calling f.length() on every child should give me my total cache size right?
Well what I'm finding is that the amount I count is about 0.9 of size reported in Manage Applications > Application Info for my app, in the Cache section.
Am I making a bad assumption that File.length() will actually return to me the size, in bytes, of a file on disk? I also wonder also if disk space in the Cache directory is being used by Android at all for some reason I'm unaware of.
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Oct 23, 2010
I've experienced a strange issue running applications on the HTC Desire.
When I call getApplicationContext().getCacheDir() or getApplicationContext().getFilesDir() from my activity this always returns null. In the emulator /data/data/com.myapp.android/cache respectively /data/data/com.myapp.android/files is returned.
Because of that I'm not able to use the webview class as it tries to create cache files and crashes with a null pointer exception. The logs:
CODE:..............
I noticed that other apps have issues as well. For example the google finance app logs the following message:
CODE:.............
Why I cannot create folders in this directory?
Is there a possibility to set the fileDir and cacheDir paths to the sd card or somewhere else? I looked at some classes like Context, Webview and CacheManager but I could not find a way to change it.
Do I need to set a permission to create cache files?
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Mar 21, 2014
I bought a Samsung Galaxy S2 Hercules (T-Mobile) and its used. In the Last week I pull some photos and mistakenly delete them, but with my "Recurva" program i could see all the photos (mine and others owners)
On the one hand I'm happy for having recovered, but if one day I want to permanently delete photos, I have the fear that the other person recovers.
How I can delete all photos, videos and files in the cache memory?
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Jul 31, 2010
long time reader, first time poster here. i just came from the HTC incredible where the browser was super fast.. and for some reason it seems extremely slow on the X, i am literally waiting and counting Mississippi's for the pages to load.. does anyone out there have the same problem? and if so.. what is the solution.
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Mar 21, 2014
I'm looking for a method or an application for android tablet, which allows me to quickly reset the device deleting any data (from the Internet cache, and the cache to the photos of the various programs such as facebook, twitter etc ...) and that does not allow any modification of the operating system. I need this solution because I have a restaurant and I want to put a tablet on each table for guests to make him see the menu (full of photos and videos), surf the internet and play with the kids.
is there an app that allows this? or is there a quick way to do this, such as a multiaccount management ? I remember, for example, that for windows there are applications that completely erase any unauthorized modification, files and cache, at the time you restart the operating system.
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Aug 16, 2012
In cm roms, dalvik cache of system apps are generated in /cache but those data/apps are generated in /data. Is there any way to disable this behaviour? Cache partition in our phones is too small. In AOSP and AOKP and stock roms, dalvik cache is always generated in /data no matter whether its a system app. any way to achieve this in cm roms?
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Jun 21, 2010
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:
What could be a right MAX_MEMORY_SIZE value? Also, Is it a good approach? A good answer also could be: "Don't do it! SoftReference is already enough"
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Dec 31, 2009
How do you clear the cache on the browser?
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Aug 17, 2010
When I test my app, I notice that after some use it has built up a fairly large cache of several Mb. I see this when I go to Menu-
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Jun 17, 2009
From the JavaDoc, it said it returns 'a bitmap representing this view or null if cache is disabled'. My question is what if the View is longer than the phone screen (you need to scroll vertically), what does the bitmap return? * only the visible portion of the view * everything the view has (both visible + invisible part)
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Mar 18, 2009
My app is downloading a file that does not need to be kept. So I was trying to put it in the directory returned by Environment.getDownloadCacheDirectory() (that returns "/cache").
But apparently it is not accessible, (a FileNotFoundException is thrown).
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Sep 3, 2010
I work on an application to display a remote page in a webview. The page contains a simple input form and an image. The image is updated automatically by server using specific header. The page is never displayed.
Searching on the web to find a way to resolve this issue.
I read this : http://remotedroid.net/blog/2009/11/13/android-browser-caching/ "Pragma: no-cache, and all the other server-side headers also have no effect as far as I can tell."
Do you have a work around ?
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Apr 27, 2010
I have a couple apps I have noticed when I open a file it must cache the file internally, but gives me no way to clear. For example Zumodrive and repligo reader both will show 20+mb in my settings, but clear cache is greyed out and shows 0mb. However when I delete these apps and reinstall them, I get all that internal memory back. I am running a rooted Nexus One.
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Oct 20, 2010
I'm trying to understand the way android handles my application cache data....Some times i'll go in there and the cache directory is 6-7mb. What type of data is stored there? Is there a way in the mainifest I can say don't use cache or clear cache at Xmb ?
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Aug 16, 2010
I have seen that xml parsing is very slow. Using sax would be better, but benchmark show that sax work only 30% faster as dom. Is right? Is faster if I construct a "DOM" using sax?
To reduce time i like to cache xml file. Caching it as xml is not a good idea because the parsing time is there again the secondo time.
Should I use sqllite? Is faster? Is an idea to use an ObjectOutputStream? Can I put in asset a file maked by ObjectOutputStream or the serialized objects can be different in different mobile hardware?
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Mar 4, 2009
Recently I switched to SDK 1.1 and it worked for a short time without any problems. Now I'm getting "Can't open dex cache '/data/dalvik- cache/system ..." error and emulator doesn't start at all. Just shows Android screen of death with blinking cursor. When I repoint Eclipse back to 1.0 r2 it works fine. I did adb shell and /data folder is empty.
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Jan 22, 2010
Coming from a Blackberry Storm, I had Slacker Radio and it was one of the first apps I downloaded on my new Eris yesterday. However, I am finding that the ability to cache radio stations to your media card is missing from the features of the Android app. The cache was extremely useful as it wouldn't force the data connection and thus helped to conserve battery life.
Is there an alternative app for radio that will cache stations or do I need to hit up the Slacker team to get an update to the Android App?
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Aug 10, 2010
My app has a WebView which displays Google maps. I'm trying to limit the cache size to a reasonable one - like 2MB. After checking with settings->applications->manage applications I found out that regular page load gets the cache to 900kb. And dispite my efforts, I can't limit the cache size or monitor when the cache limit is being reached. If I'm playing with the map on the webview, the app can even reach 10MB and no "ache max size reached" message is received.
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Aug 2, 2010
I've seen some apps like dolphin browser (not the HD version, the normal one) utilizing a cache-to-sd for webview but i can't seem to figure out how to do this, does anyone know how to do this or point me in the right direction?
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Aug 26, 2010
is there a good app that can clear my phones cache without having to root my phone, a free app? i couldn't find one and is it bad to delete cache? dont i need it on my phone, at least some?
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Feb 14, 2010
I searched and found many posts regarding clearing cache. But didn't find this answer. Is there a way to clear cache on all apps at once? I went through the settings/applications/manage apps, and checked and cleared cache on many, but this is real tedious, but seemed to give great results. Phone feels much faster. (NOT ROOTED) Psychological? Dunno, but question still stands, does anyone know an easy way to do this? Additionally, is there any risk of clearing cache from any apps?
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Jul 24, 2009
Is it possible to force the cache of your app to clear when the user exits the app? My app piles up cache data (rightfully so) on each start, which is no longer needed once the user quits the app, so I am trying to find a way to forcibly clear it.
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Feb 1, 2010
I've made an application based on the Google Maps API. The problem is that my application is made to be used in the wild, in places where there is no network. So I would like to manage the cache in order to ensure that specific tiles are saved and available during the trip (I'd like to redirect them in database but any method may do). For now, I didn't found any other method (not tested) than try to recode the MapView class. I'm focusing on Google API in order to have satellite photography (for places where there are no roads). What could I do ?
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Jan 5, 2010
I have an ArrayList of custom, simple Serializable objects I would like to cache to disk and read on re-launch. My data is very small, about 25 objects and at most 5 lists so I think SQLite would be overkill. In the iPhone world I would use NSKeyedArchiver and NSKeyedUnarchiver which works great. On Android I've attempted to do this with with a FileOutputStream and ObjectOutputStream and while the result is the same, the performance is terrible. Is there a better (read faster) way to cache small objects to the file system in Android?
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Dec 22, 2009
How to cache images after they are downloaded from web
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Apr 24, 2009
Can anybody advice what is the recommended directory to store files generated by your application: audio files, video files or some images.
If the phone contains SD card, it is clear that files should be saved there, but if there is no any external storage. where would you recommend to save to?
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Mar 19, 2009
I wrote an app that downloads web sites and all their assets (images/stylesheets) to "disk" and therefore stores lots of small files on the SD card.
Sometimes it fails to delete large amounts of files and afterward the file system is r/o. To analyze that behavior I tried to do the removal of the files by hand and then go from there. But that already failed.
localhost:~ mkamp$ adb -d shell mount [.. some mounts ..] /dev/block/mmcblk0p1 /sdcard vfat rw,dirsync,nosuid,nodev,noexec,uid=1000,gid=1000,fmask=0711,dmask=0700,codepage=cp437,iocharset=iso8859-1,utf8 0 0 --> R/W
Last login: Wed Mar 18 19:41:49 on ttys005 localhost:~ mkamp$ adb -d shell rm /sdcard/newsrob/a* [.. minutes of silent deletes ..] rm failed for /sdcard/newsrob/a2aade03616c28b30_113.png, Read-only file system localhost:~ mkamp$
localhost:~ mkamp$ adb -d shell mount [.. some mounts ..] /dev/block/mmcblk0p1 /sdcard vfat ro,dirsync,nosuid,nodev,noexec,uid=1000,gid=1000,fmask=0711,dmask=0700,codepage=cp437,iocharset=iso8859-1,utf8 0 0 --> R/O now
The log contained nothing but the usual gc output and random WiFi status changed mumbo jumbo.
Anybody else seeing this behavior?
There were 6.500 files in that directory. Might that be the problem? I don't access the files with queries, I always have the exact name.
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Nov 4, 2010
I am working on an android app. Where i need to parse some plist files from assets folder. I do understand how to use assets in android but now problem is that file sizes are more than 1MB and so android gives error Data Exceeds UNCOMPRESS_DATA_MAX (2183588 vs 1048576). how to access such larger files from assets? Also I cant reduce a file into small buffers because i am just sending it to "DocumentBuilder.parse(in)" as a whole so can not use buffer. The error is on line: Document doc = db.parse(in).
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Jun 11, 2010
I am trying to overlay route data in KML files on a MapView.
The following code works great:
CODE:................
The only problem I have with this is that I don't need to re download these KML files every time. I have about 10-15 KML files that will rarely change. Also since it has to connect, download, and parse these each time there is a delay in opening the maps.
It would make a lot more since for me to save these as a local resource and have the URI reference it there. Is there a way to construct a URI using the geo: scheme and have it point towards a local resource?
It looks like file:///sdcard support was included in 2.1. The only reference I could find to it was at the end of this bug report thread. I am currently at work and don't have time to play with this yet but I would like to figure it out later. I feel like there are a lot of people on stackoverflow and elsewhere who would really appreciate a reasonable way to do this.
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Jul 29, 2009
To android working on eclipse with android 1.5 r2 version when i am running a basic program its showing a error .apk file not found.
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