Android :: Good Way To Cache Data During App Lifecycle
Apr 20, 2010
I have creating application with 3 activities, where A - list of categories, B - list of items, C - single item. Data displayed in B and C is parsed from online XML. But, if I go trough A -> B1 -> C, then back to A and then back to B1 I would like to have it's data cached somewhere so I wouldn't have to request XML again.I'm new to Android and Java programming, I've googled a lot and still can't find (or simply do not have an idea where to look) a way to do what I want.Would storing all received data in main activity A (HashMaps? ContentProviders?) and then passing to B and C (if they get same request that was before) be a good idea?
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Nov 17, 2010
I'm fairly new in Android/Java programming, so some of the basic stuff is still quite confusing. So, lets say my application gets all data (articles) it requires from external XML files, it parses them to data models (Article class) and those articles will be used (displaying in lists or single article) all over the application for all it's lifecycle.
Where should I keep them? Can I create singleton class with an array containing all the articles I've parsed? Or should I save them to database and then query it on demand? (that sounds like too much work, I don't need to cache them for now) What's the best practice here?
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Nov 26, 2009
My app is made of two activities, A and B. I'm considering this sequence of steps: Activity A is started. A launches B [A is paused, B is running]. B launches a map intent [A and B are both paused now]. Now the user is using the maps application and the system decides it needs more memory. Can the system kill only one of my activities for memory, or will it always kill all activities in a "process" in this situation?
Both activities share some static data like:
class Data {
public static String mName;
public void save() {
// write to file: mName;...................
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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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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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Oct 3, 2010
So using Rom manager I went ffrom baked snack 1.7 to 1.8 I wiped data and cleared SD cache and I lost everything all my apps. I rid back up 1.7 so is there any way i can get my apps back cuz I don't want to download.them again
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Sep 28, 2010
I am trying to install [ROM] Uncommon Sense (v1.0) Release! - xda-developers and it says I need the full wipe!
Does that mean I have to wipe? the cache and data? The two options availabe for wipe in the menu? Also, I place the zip in the root of the memory card, yes?
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Jul 27, 2012
If I boot into clockwork recovery and clear the cache/data and/or the dalvik cache and then boot back into my rom, will it still work?
I recovered my rom without clearing it beforehand and now all sorts of minor weird things are going wrong. its fine, just annoying.
I have a Galaxy S3 on at&t (i747)
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Aug 10, 2010
Wanted to wipe data/cache before i flashed a new rom..so i did it in recovery..but after i did it and rebooted, when i got to the "touch android to begin" the touch wouldnt register..what's the problem? tired it a few times and was the same.
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Oct 6, 2010
I'm considering installing a rom and I've heard that doing a data and cache wipe is the proper thing to do to ensure success. What I'm concerned about is how easy it is to restore/re-do all of your settings like ringtones, notification settings, app settings etc. How long does it usually take you to set up your phone again after installing the new rom?
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Aug 5, 2010
If you do not root, you could go from 2.0.1 to 2.1 with no wiping of data and cache, it just installs & away you go. Same with 2.1 to 2.2. No wiping of data and cache and all is still there as you left it: apps, settings, preferences, etc. SO, why is it important to do this if you root? What's the difference? And, who said it was important to do? Is there some exact proven logic on why if your rooted you must do this and if not, your somehow fine? That 1 step difference causes a lot of extra work, so I am wondering why this is said to be a must for rooters and non rooters need not do it when they get updates?
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Nov 18, 2010
i cleared this on reinstalling the superclean rom and it deleted all my contacts along with cwm, root explorer, etc.. unfortunately i have to sign back into my gmail to download all these from the anrdroid marketplace but i forgot the password since i just created the account last week and never used it other than on my phone... sooo i want to install the backup i made but i don't have cwm or rom manager.. can i use odin to install my backup and how if it's possible?
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Nov 5, 2013
I'm getting the following error message "Unfortunately Gallery has stopped". In the Apps manager for Gallery, I have already cleared the cache and cleared the data, and also pressed "force stop". I've also restarted the phone. However it's still not working.
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Apr 13, 2010
Im running CyanogenMod 5.0.5.7 with BlackIceTheme right now and im wanting to switch to NexTheme 2.0 so just switching themes not roms i went ahead and downloaded it on rom manager and installed it without wiping data/cache when the phone rebooted it had no signal and still had part of the BlackIce theme and parts of nextheme so no i need to wipe data/cache before installing this theme
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Feb 28, 2010
I am confused about the whole wiping the cache and data. I don't know exactly what cache and data are and that's why I'm confused. Do u have to wipe all data and cache before u switch Roms, if not what happens? I am afraid of losing all of my apps and contacts even tho my gmail will restore my contacts how do I know if it has the contacts saved and how would I get my apps back? One more thing, do u have to make more than one backup if u already have one that u r happy with?
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Apr 13, 2012
How can I move dalvik-cache and data/data to sd card or sd ext2?
HTC Explorer A310e
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Nov 30, 2010
When downloading a custom rom and the dev says wipe data/cache thats when im in recovery right? I see the options but do i do the data first and will it take me out of there and I gotta go back then wipe the cache? or will it just wipe data and then hit the back button and wipe cache and then hit the back button and hit install from sd?
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Jul 13, 2010
Well since I've got into installing custom ROMs its nice, but I hate wiping data/cache. I've gone from Nexbeast 1.1 to Nexfro .4 without a wipe. No complaints but when I drop my phone it immediately reboots. When I open it and click stuff to fast it will reboot and sometimes for no reason at all. Is this because of me not wiping data or just sucky phone? Using stock kernel. When going to CM6 should I wipe data?
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Sep 17, 2010
I have installed UD8 for about a week now. But ever since I have flashed some kernels (slayers 1100lv, chevys 1100 lv, p31200) I have not had the stability nor the quickness that the original 800 stock kernel gave.
I made a nandroid backup b4 flashing those roms..so my question is this: Do i have to wipe cache/data before i flash my nandroid backup? Or can i just flash it w/o doing any extra steps?
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Oct 25, 2010
I want to keep track of my 3g data now on smaller bundle - is there a good one? ones ive seen in store so far dont seem very accurate for 3g data.
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Jul 13, 2010
We are supposed to cache textual and audio data in our application until device is booted or maximum of two days, whichever happens earlier. To get a perspective on data to be cached, note that we are to store about 200 text headers containing around 10 fields, each of length 30 bytes and about 20 sound files each about a minute long.We are getting the textual data by parsing XMLs and then we keep them in ArrayLists. The sound files are directly written inside the app storage using File I/O (and not on SDcard or Apps Cache directory).This application is to be run on devices running Android 1.5 or later.I understand, and please correct me if I am wrong, that we can cache the files either on SDcard or inside the application or inside applications Cache directory.
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Dec 19, 2012
OK, before I start, it's about an LT15i. I don't know what's happening, but at some .FTFs Flashtool does not show the file list (middle column) and neither "wipe cache" or data and one FTF has the "wipe cache" option only. This is really annoying. Tutorials specify a download link for a specific FTF and after starting Flashtool and selecting the flash option, that FTF is not showing up properly. Should I download an earlier version of the program?
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Jan 15, 2013
I am running a cm10 based Rom on my note 2 and as such can't move apps to the sd card through the usual channels. I was able to get my play music cached songs to store on the external sd and any way to do the same for Google Play magazines as they take up more room.
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Nov 25, 2010
How do i log off gmail and gtalk. I tried disabling the data traffic and clearing the cache.
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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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Apr 5, 2010
In my application I have several activities, the main screen has 4 buttons that each start a different activity. So one of them is a search activity, once it searches it shows you a result activity. This result activity can be reached from other activities, so in general something like this:
Main activity -> Search activity -> Result activity
Main acitivty -> someother activity -> Result activity
Now, if I have reached this result activity and press back once or twice, and after that press the Home key it will show the Home screen. But if I want to get back to my application by holding the Home button and clicking on my app it will always go back to the Result activity, no matter which activity was the last one I was using. And if I press again back it will take me back to the Home screen.
If I try it again it will take me again to the Result activity. The only way to avoid this is to start the application by clicking on the app's icon. And this takes me to the last activity I was using and it remembers the state so if I press back again it doesn't take me to the Home screen, instead to the activity before it. To illustrate this:
Main activity -> Search activity -> result activity --back--> Search activity --Home Button--> Home Screen --Hold Home and select the app --> Result activity --back--> Home Screen
--Click application icon--> Search activity --back--> Main activity
Another thing that happens is that if I press the Home button while on the Result activity, and start the app by clicking the icon, it will take me to the activity prior the the Result one.
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Sep 10, 2010
There's a decent amount of information out there on the Activity lifecycle. But I'm surprised how difficult it is to find a comprehensive description of the rendering lifecycle. By that I mean the order and rules by which a tree of nested activities, views, and drawables get to be sized and drawn to the screen, and the points at which a developer can modify rendering behavior.
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Sep 18, 2012
I am using this awesome AOKP ROM that lately has had a lot of nightlies. I have found that going back into the play store and redownloading every app.
Also when I do reinstall my apps, all the app data (game progress user logins etc) are gone. How can I back that up?
And finally if I do back up the data from the apps, will that mess with my ROM at all? SGH-I747
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Jul 7, 2010
Recently replaced the HTC Sense launcher with ADW launcher, which I highly recommend! However the HTC mobile data widget has now disappeared and I can't seem to find it. Anyone know how to get it back or a good replacement?
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