Android : Want To Maintain Persistent State Information?
Nov 9, 2010
This usually happens when the user hits "Home", does something else, then eventually wanders back into the app - it attempts to go back to where it was before, but the application Context has mysteriously lost all its previously-saved state information (in my case, a few integers and a few Strings). I know this is a very vague question, but are there any cases (other than the user using "back" to back completely out of the application) where the application Context gets completely destroyed even though the application is not terminated? Is there a better way to maintain persistent state information?
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Aug 31, 2010
I noticed that recently any photo uploads have the caption "Uploaded via Facebook Mobile" instead of "Uploaded via Facebook for Android". This changed sometime between May 10 and 15: Sometime between May 10 and 15 the Facebook Android app has c on Twitpic.Can anyone help me with this issue? and is anybody having the same problems as I'm having?
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Oct 6, 2010
My ListActivity is bound to an ArrayAdapter where I have overriden the getView() method. If I change the visibility of a widget in that method or modify the view's background color, those changes somehow get lost once that modified list item returns after being scrolled off the screen. In fact, some other view in the list is picking up the changes. How do I get the modified view to look the same when it's redisplayed after scrolling?
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Apr 8, 2010
I am working on my App. in between i pressed the Home button on the device. my app will go to the background tasks. After that i long press the home button it will show my app as a persistent state. i.e where and what i had done in my app. But i click my app in the directory window it restarts my app. i want to do if my app is in the background tasks it will wake up else it will start. how to achieve that?
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Oct 5, 2010
I have created one custom view that contains the horizontalscrollview. Now when i changes the orientation its scroll state change to 0 every time. I got the previous scroll state by using onSaveInstanceState(Bundle savedInstanceState) and onRestoreInstanceState(Bundle savedInstanceState) . in onRestoreInstanceState i am using following method to get reposition the scroll, hoz_scroll.scrollTo(hoz_x_pos, hoz_scroll.getScrollY());
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Aug 26, 2009
I know I can save information in a static attribute in a widget, however, is there a way for a widget instance to save the state information similar to the Activity onSaveInstanceState(Bundle outState) method? I don't want to write to a database for this state information.
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Sep 15, 2010
I have an unlockable mode in my game that is only available once the story mode has been completed. This works perfectly if the story mode is completed during a test play through, because upon returning to the main menu the bonus mode is unlocked and selectable. However when I shut down the app and relaunch it, none of the previous state information is retained and it requires you to beat the story mode again to access the bonus mode.
I use the onSaveInstanceState method to create a bundle that stores this information (ie. a boolean whether the mode is unlocked or not), but this information seems to be lost between ending the app, and relaunching it. The onCreate method takes the parameter of a savedInstanceState but yet this seems to be null.
Is there a step that I'm missing out, or doing incorrectly somewhere along the line? On a PC game I would just serialize the state into a text file and look for a special string/symbol upon initialization but I cant do that here so i thought the outState bundle you create in SIS was how you retained information for use upon next launching the app again?
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Nov 7, 2010
Where is the UI state information (used in super.onCreate(Bundle savedInstanceState)) stored and how can it be deleted from another app or command line on a rooted phone?
I need to delete the user data (username, password) of both the native Facebook app (com.facebook.katana) and the stock browser on Android (com.android.browser) on a rooted phone via command line (which I call from my own app) or elsewhere from my own app.
This is what I'm calling:
rm /data/data/com.android.browser/cache/webviewCache/* rm /data/data/com.android.browser/databases/* killall -9 com.android.browser
rm /data/data/com.facebook.katana/cache/webviewCache/* rm /data/data/com.facebook.katana/databases/* killall -9 com.facebook.katana
After I kill the facebook process, I check the running processesand there is no FB process running anymore. I then restart FB via long-press on home and choosing the FB app. Previous username/password still show on the login screen (= same screen as I left it before I killed the app). When I then press 'back' on the device, and then start the app again via home long-press / select FB, the login screen is empty.
Where do the values for username/password come when I start FB again in the first place? I assume that the login activity still retrieves the savedInstanceState, but how could that be avoided - or else, where are those UI states actually stored, in order to delete them? Shouldn't the restarted app, after all it's processes are killed, already be in a new lifecycle?
Same problem is with the stock browser: if i leave the browser and I'm on the login page of for example gmail.com where the username/password is entered (but form not submitted yet), then killing the browser process, the values (username) entered into the form will still be there after restarting the app again after it's been killed.
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Aug 11, 2010
I have a compound UI component built up from a ViewGroup containing a number of TextView, ImageView etc. components. Many of these have StateListDrawables as their images/backgrounds. Is there any way of making them select from this drawable based on the state of the parent ViewGroup rather than the component itself? Ideally I want to be able to change the visual state of all children of the ViewGroup (text colour, image etc) based on the state of the ViewGroup, preferably without having to hook up complex logical code. This seems like a fairly common sort of requirement, so I was hoping it would be straightforward in Android - am I going to be disappointed?
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Feb 8, 2009
I'm a little confused by what I'm seeing with regards to phone state transitions via the PhoneStateListener. When I receive a call, this is what happens: (call comes in) RINGING -> IDLE (I pick up) OFFHOOK (I hang up) IDLE It's that first transition from RINGING to IDLE without any interaction from me (not ending the call, not answering the call) that confuses me. Do I really have to implement an idle counter to know that an incoming call has really ended? Seems like the reported phone state represents some sort of phone state that isn't the obvious one.Is this a bug or am I just not in tune with the paradigm here?
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Jul 7, 2010
I am a Mac user (photographer/ videographer). I also rely heavily on my iPod Touch when mobile (i can often find a wifi signal when i am out and about). I use iCal on the Touch and iCal on my Mac as well as the address book on both everyday and as a Mobile Me user, my two devices sync so everything is mirrored and up to date. I also HATE AT&T for their terrible signal strength and coverage and have been a loyal Verizon customer for many years and this is why I don't have an iPhone. Okay, all that being said, is there an easy way to still use everything I love and rely on with my Mac (the calender and address book, mainly) and easily sync all of my existing information and future info to an Android based device? How easy is it to use an Android device with a Mac? I don't want to have to manually re-enter my entire address book into a new device.
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Oct 2, 2009
My application needs to store some application specific data on the device that persist, even when the app is uninstalled. Using files or databases is not possible as they are deleted with the app when the app is uninstalled. Storing it on an SD-card is too fragile. It is my understanding Content Providers also are deleted with their parent app?
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Aug 6, 2009
I need to retain a complex object in my service, so I can reliably come back to it (it holds updates). Initially I coded it just as a class filed in my Service implementation but I'm observing that the updates object is periodically reset to null which tells me that server class itself is recreated. Can someone recommend lightweight reliable strategy to save and recreate such updates object (I can make it serializable)
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Jan 8, 2010
The requirement is totally simple: I want to have a lite and pro version of an app. There is a little bit of difference between those two apps, but they are 99% identically. Unfortunately it seems that the best choice is to really treat this as two projects that are one and the same and copy over the source code and assets from one to the other. The Android Manifest file must be different, because the Android Market - for some reason - makes the implementation's package name the ID. Working around this ID issue the straight forward approach would be to have a third project with the common code that exports its code, libraries and in a best case scenario also the ressources to the other two objects. Unfortunately this doesn't work. Only the actual Android projects generate the R.class and so the common project would need to be dependent on it..
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May 18, 2010
Im using
CODE:.......
Now, since Cookie does not implement serializeable, I can't serialize that List.
specified my goal, not only the problem)
My goal is to use the DefaultHttpClient with persistent cookies.
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Nov 22, 2010
I am new to android programming. In my application, i want to implement automatic scrolling. So, i used scroller for this purpose.It is performing scrolling but not maintaining constant speed till the end of scrolling the text. Can anyone help me out of this problem.
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Apr 17, 2010
According to the instructions found here, to make your app state which screen sizes you can support, you'll need to compile your app against Android 1.6.
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Aug 22, 2010
During my game loop I am constantly loading images using BitmapFactory.decodeResource(getResources(), R.drawable.objectx); Most of the time I'm calling images that have already been decoded earlier. Am I slowing down execution by decoding the resource every time? Is it better to store every image into a Map (or Dictionary) at the beginning of the program? If so, how do you get the resource IDs for all images in the drawable folder?
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Jul 21, 2010
In the class PersistentState.java the prefs variable gets the saved/typed text from prior sessions here, on line 106 into restoredText.
Where does the getString method get the saved/typed text?
CODE:............
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Apr 29, 2010
First off, let me say that feel free to recommend me if long lived TCP persistent connections are the way to go or persistent HTTP connections are better.
I've also pre-read that instead of having a persistent connection, I can have a polling mechanism.
I'm just asking in the curious interest of how can I create a persistent connection from Android to a server?
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Nov 23, 2010
How can I execute an action (maybe an Intent) on every specified time (e.g. Every day on 5AM)? It has to stay after device reboots, similar to how cron works.
I am not sure if I can use AlarmManager for this, or can I?
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Sep 9, 2010
I would like to know if its possible to prevent my application from looking different every time I run it on a different android phone. For example, on stock 2.2, my seek bar (with default values and theme) has an orange color for the selected portion, whereas on a Samsung Galaxy S (with 2.1), it is green. Also the tab background is grey in stock 2.2, but blue in Galaxy S. On a similar note, my rating bar changes size too. I do not implement multiple screen resolutions and all my drawables are located in the "drawables" folder under "res". I donot specify a minimum sdk requirement.
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Nov 21, 2010
I have two spinners in an activity, A and B. Each spinner uses an arrayAdapter linked to one or more string-arrays from an XML file. I need multiple because B's values are populated depending on what is selected in A.
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Oct 27, 2010
I'm writing a bitmap editor where I use the Command Pattern to represent actions that will transform the document. I keep all the commands executed so far in a list and, to implement undo, I restore the document to its initial state and then replay all but the last command.
I would like my undo/redo system to have the following feature: When the user closes the editor and returns, the document, including the available undo and redo commands, should be restored to the state it was in when the user left.
I'm implementing this for Android where your application can be given very little notice before it will be cleared from memory if e.g. the user gets a phone call. Also, some of my commands are e.g. a list of all the x,y co-ord the user painted on so these might take a few moments to save to disk.
My current idea is as follows:
When a new action is performed, the command object is added to a list S for commands that need to be saved to disk.
A background thread is used that will continually take commands from list S and save them to disk. The postfix of the filenames used will be numbered in sequence. For example, if the user filled the screen then drew 2 circles, the command files might be called FillCommand1.cmd, DrawCircleCommand2.cmd, DrawCircleCommand3.cmd.
Periodically, we save a "checkpoint" command whose purpose is to store the full document state so that, even if one of the .cmd files is corrupted, we can restore a recent version of the document.
When the user exits the app, the background thread attempts to finish up saving all the commands it can (but it might get killed).
On startup, we look for the most recent .cmd file that represents a checkpoint that we can load successfully. All the .cmd files we can load after this (i.e. some files might be corrupt) go in the redo command list, all the .cmd files we can load between the first checkpoint loaded and the oldest checkpoint we can load go in the undo list.
I want the undo limit to be about 20 or 30 commands back so I need extra logic for discarding commands, deleting .cmd files and I've got to worry about multi-threading behaviour. This system seems pretty complex and will need a lot of testing to make sure it doesn't go wrong.
Is there anything in Java or Android than can help make this easier? Am I reinventing the wheel anywhere? Maybe a database would be better?
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Aug 25, 2010
Is there an app that I can use to maintain the balances of multiple credit cards? The app does not need to be able to directly access the credit card's balances online (straight thru online banking), but I must be able to add transactions and update it manually. I also should be able to manage multiple cards without the app adding the balances of all cards into a grand total (balance).
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Apr 27, 2010
How can I maintain the position of my ListView in my activity when I go to another activity (by launching another intent) and then come back (press the back button)?
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Jul 2, 2010
Well, not sure if this was already somewhere else, but I looked and couldn't find it, so I'm gonna ask here...
What are the required APKs to maintain running the Android OS? I have root access on my Eris, and was tinkering around with a bit with removing some of the preinstalled APKs such as YouTube and stuff like that, just wondering how much I can delete and work to create my own system to a certain extent. Anyone that can let me know what I need would be nice.
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Feb 19, 2010
I have an application that sets the user's background. Is it possible to remove the wallpaper if my app is uninstalled?
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Oct 22, 2010
How do you stop persistent programs,
for instance:
when i goto manage applications -> running services, fring is always running even if i don't run the app.
I will force stop the app, then minutes later, it will be back there again. that's just one of them.
Amazon mp3 also does the same thing. it still comes back even if i use titanium backup to freeze the app.
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May 8, 2010
I have built an app for the Motorola Droid which should automatically update a server with the phone's location. After the user performs a particular task on the main activity screen, an alarm is set to update the user's location periodically, using a service. The alarm is explicitly stopped when the user completes another task. Thing is, I have set up a location manager within the main activity's onCreate() method which is supposed to place the first acquired lat/long into two textview fields. Even though the manifest is set up for acquiring coarse and fine coords and I'm using requestLocationUpdates (String provider, long minTime, float minDistance, LocationListener listener), with minTime and minDistance set to zero, I'm not seeing the coords coming up on the screen.
With that, I'm not recording any locations on the server. When I seed the textviews with sample coords, they are being recorded fine on the server. I am not at a computer that can run the IDE, so don't currently have the code, but am desperate for some help on this. One other thing is that the main activity screen calls a photography app before the user manually clicks "send data". I'm suspicious that I may need to override the main activity's onResume() method to do this location acquisition.
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