Android :: Where To Globally Keep / Cache Data Needed For All Application Lifecycle?
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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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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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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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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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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Jul 8, 2010
I am trying to create a Servicefor my application which will negotiate Bluetooth connections and data. I want this service's lifecycle to start and end with the Application, but still be able to have specific Activities listen for events that occur within this service (in addition an Activty should be able to call specific methods of the Service to write data or query connection state).
I started by creating AIDL interfaces for my callbacks and service, but I can't figure out exactly what I'm doing.
How is the best way to go about this? EDIT: To be clear, I do not specifically need (or want) more than one process for my application. Right now I don't have more than one; I'm just using AIDL because it is the only way I know of for a Service to communicate with an Activity.
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Apr 19, 2010
I slapped together a simple test application that has a button, and makes a noise when the user clicks on it.
Here are it's method:
CODE:..................
My question is, why is onCreate acting like it's in a while loop? I can click on the button whenever, and it makes the sound. I might think it was just a property of listeners, but the Button object wasn't a member variable. I thought that Android would just go through onCreate onse, and proceed onto the next lifecycle method. Also, I know that my current way of seeing if the sound is playing is crap...I'll get to that later.
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Jul 29, 2009
As above, shouldnt this be a feature of Android. The reason all Android phones have poor battery life is as a result of that.Couldnt someone make an app that disconnects the data connection when not being used?Im really not sure why Android does have an option of sync regularity too? Perhaps an app idea if possible?
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Aug 12, 2009
In my application I would like to catch all exceptions globally - it should not matter, where those exceptions occur. Some runtime exceptions are practically impossible to catch (OutOfMemoryError for instance), but I want to show an informative dialog and resume execution at some well-defined point (main menu activity or something).
Using Thread.setDefaultUncaughtExceptionHandler() does this for background threads, but it is of no help in the UI thread (or adjacent handlers). If an exception occurs in the UI thread, the UI will be jammed - not reacting to any key or touch events anymore. Of course, this seems natural since it did not catch that exception; but I wonder if there is a way to recover the UI thread. So:
- Can I recover / restart the UI thread after an uncaught exception (from another thread) ?
- Is there another way to catch uncaught exceptions globally ?
- Are there viable alternatives to handle this problem ?
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Nov 2, 2009
I'm a total newbie to Android (and to Java in general... mostly a PERL/ PHP guy here...), so forgive me if I use the wrong terminology to refer to things... I have been asked by my company to implement an application for Android that allows a user to enter a note at the end of every call. E.g., either they or the other party hangs up, immediately a notes area pops up with a "save" button and if they enter a note, the note is saved with a reference to the call log entry. As I understand it, onCallStateChange() will give a pretty good indicator of a hangup if the state has become Telephony Manager.CALL_STATE_IDLE. I've figured out how to do the UI part, how to save it in a database, etc... My question, however, is about how I implement this "listening" aspect of it. Should I have a service running all the time that has an instance of android.telephony.PhoneStateListener? If so, do I use the onBind or onStart method, and how do I make sure it doesn't go away when memory runs low? Or can I somehow attach the listener to this event, and then terminate? Or is a Broadcast Receiver the way to go?
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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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Jul 30, 2010
In my current application design, I have an activity class application.java (which starts on launching the application), and it does not have a layout(UI screen). I call another class called servicebind.java from the onCreate method of my 1st class. here I bind to the local server (bindServer()). i call back the application class through an intent. Once I am back to my application class, I call my activity class called welcome.java which has a layout/UI. When I run this application, I am able to see the welcome screen. But the problem is, when I click on the back button, I get a black screen with just the title on top. I have to hit back button 3 times to exit the application.
The reason I see from the logs is that, the 1st 2 activity classes (application.java and services.java) does not get destroyed unless I hit the back button. So the 1st time I hit back button, the welcome activity gets destroyed. the next back button destroys the servicebind class and final back destroys the application class. Is the reason because these classes dont have a UI to display in the onCreate method. I do not want to change my design where I bind the service in the servicebind class and call the welcome activity in the application class.
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Sep 10, 2009
Broov Internet Radio/ripper : Free Android application. We need beta testing to be done for our Internet radio/ripper application in Android platform supporting 1500+ radio stations based on genre, region and popularity of channels and also with PLS and M3U file support. Please contact vnareshprasad@broov.com to test and use the Internet radio application free .. and send feedback to improve it. and ugrade it for you people..
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Jun 13, 2010
We need some one to create an app that will bring the phone out of standby using the joystick.It doesnt need to unlock it it just needs to turn on the screen so we can unlock.Any one know who i can email so that we can get a developer working on this project.This one is one thing i REALLY need on the incredible.Hitting the power button over and over sucks.
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Mar 4, 2010
I'm making an Android Java app game (although this question applies to all languages really) and hope to release the first version soon. I'm nervous about how I save data in my game. My problem is that, if in a later update, I decide to store more data or store the same data in a different way, I need to be careful I don't lose or corrupt data for users that upgrade (i.e. I want users to be able to use data created by an old version in the new version, like their high scores from before).For example, say I want to save high scores in version 1.
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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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Mar 16, 2010
I have a WebView. I'm not quite sure how caching works for it. Ideally I'd like to load a web page from the network once (images included), then from then on only ever load it from the local cache. I'm not sure if we have this level of control over webview. Will it at some point just auto-clear the cache? How could I tell? I need to be sure that it's really keeping the page cached between different runs of my application.http://developer.android.com/reference/android/webkit/WebSettings.html.
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Sep 24, 2010
Which version of Android is needed to create a working augmented reality application ?
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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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May 1, 2010
Quick App Clean Cache. Any one else notice this is now missing from the Market? I'm assuming its due to the fact its copy protected but now its unpurchasable. Any one know another location it can be found? I wanted to buy this but should have done it before updating to 2.1 v3.
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Aug 31, 2010
I have set of images fetched from internet and set it on gridview,here i have option to click here to view more,below the grid view and it fetches images and set it on grid with prevoius set of images,when i exit the application and run it again,the previous set of images remain in cache and grid shows images from cache,here i need to clear my application cache memory,when i exited my application.how can i get it.
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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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