Android :: Storing Game State Information That Is Retained And Used Upon Next Start-Up
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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Jun 1, 2010
I have about twenty pages of information that is stored in tables that needs to be stored in my Android application. Each column is a designated stop on a bus route and the column is filled with times that the bus will be at the stop. There is also certain information that needs to be associated with some times, such as if the bus is handicap accessible at a certain time.
Here is an example of one of the tables: Bus Times
I have thought about using a SQL lite as that seems as though it would be able to store these tables quite easily; but when I think of using SQL I think of dynamic data storage and this shouldn't be changing more than once a year.
Is SQL appropriate for this application? Is there a better way to do this?
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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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Apr 3, 2009
Just starting a little game project and have a super basic question. what's the best way to store animation images for a game? I looked at the alien bloodbath code and they store multiple frames in a single png file. Is that the preferred way or is there easier/better way to do it? MP4?
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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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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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Oct 19, 2009
calling MediaPlayer.onStart() from Activity.onResume() (after the Activity has been paused) causes the following messages in logcat: MediaPlayer start called in state 64 MediaPlayer error (-38, 0) MediaPlayer Error (-38,0) Now the question is, what are the messages trying to tell me? What state is 64?
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Nov 24, 2010
I am new to Android and i have create some navigation base Application. now i Want to make some simple racing game so can anybody provide me tutorials for how to start developing?
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May 21, 2010
I'm new to game programming. But I've got an ide for what I think would be a fun game for the Android platform.
My question is, where do I start? Anyone got some good sites to recommend or perhaps a book or two. I've got medium skills when it come to programming but iv got a masters of science degree in computer engineering so I'm not totally unfamiliar with algorithms and stuff.
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Aug 7, 2010
I've read several example programs and tutorials to try and solve my problem but they all seem to go the same way. I've used a couple Activities and xml documents to create a menu that loads when my game starts.When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu,I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView.I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong.
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May 21, 2009
I want to make simple game on Android. But i don't know the approach to start. So any 1 can help me from where i should start and which particular API (package).
I don't know nothing. So start with first step.
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Apr 1, 2012
i am trying to make a game for android but am finding it difficult. For my app i have made the menu screen, sound. But to make the actual game i am not sure where to start.I am not sure how to start making the game. I have seen some tutorials but they seem to be very confusing with all the coding.
I was wondering is there not some sort of graphical layout i can use to make the games a i did to create the buttons using the xml graphical layout in eclipse.It is for my final year project and i do not have much time left or i would have done it in flash.
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Aug 7, 2010
I've read several example programs and tutorials to try and solve my problem but they all seem to go the same way.I've used a couple Activities and xml documents to create a menu that loads when my game starts. When the user clicks the "Start The Game" button, it loads a new Activity that sets the view with my game thread and all of the game properties.I know this activity works because I've run it alone as its own project, but every way I've tried to start it after the Menu, I get a nullPointerException and it force closes.I read the SurfaceViewOverlay tutorial and attempted to use that implementation, but I'm using a SurfaceView, not a GLSurfaceView. I'm debating rewriting my entire program to use OpenGL but I figured I would see if anyone else knows what I'm doing wrong here.If you need the code snippets I can paste some here, but it's not really the specific code that's wrong, I think it's the way I'm using(abusing) the language.
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Aug 7, 2009
Wotcher all, I've had my HTC "Hero" (daft name) for about a week now and since the first few days after I'd installed a few apps, when I long-press the Home screen button, the list of last-run apps appears as expected, however the TouchFlo app (or the Home app if I'm experimenting with stock android) also appear in this list. The next time I use the Home button it gives me the choice of using Home or TouchFlo and setting one of them as the default. I hit the "use as default" button and hit TouchFlo and all is well again. However as soon as I use a long-press of the Home button again, the phone forgets the default setting and reverts to asking me which one of Home or TouchFlo I want to use as the default action for Home button presses.Does anyone know a fix for this? I've gone into App Manager and unset all the defaults, but that's had no effect. I am living with it by just not using the long-press of the Home key, as long as I avoid that the phone remembers to use TouchFlow as the default action for Home presses. I've also tried switching to using the stock Android Home app instead of HTC's but still get the phone forgetting the default when I use the long-press of Home.
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May 16, 2010
It appears the alphabetical sort setting is not retained on reboot of the Incredible. It reverts to "newest" link sort option, and I have to reselect A-Z. That being said, I've added a "*" (or "_", etc.) at the beginning of the name of each of my most-used 5 or 6 bookmarks, and it positions them, conveniently, at the top of the alphabetized list.
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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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May 22, 2010
I have a square grid, for a turn based game ( grid is similar to the chess board ), but the moves in the games are different based on whether you have lapped your opponent pawn at least once or not.i.e if you have not lapped (beaten any of the opponents pawns) in the outer most grid as below.if you have lapped your opponent pawn once at least, then you get to reach home,this way.Any player having all his pawns reaching "home" first wins.The ones in yellow are safe-houses, i.e both the opponent pawn and the player's pawn get to stay in the same grid, this is not considered to be lapping ( the opponent ).The lapped pawn will return to its start point.Now the question is, what is the effective way to store the paths for the all the pawns.we will have 4 pawns for the player and 4 opponent pawns.Is there any pattern to store such static information, in a elegant way?
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Nov 12, 2010
I have a puzzle game with a 7x7 grid of graphics, and a timer, its just about ready to go. But I am stuck on how to go about saving/continuing game. For example when someone exits I want them to be able to save and exit, then come back and click continue to pick up where they left off with all of the graphics in the right place, timer and score. I looked at onSaveInstanceState android examples, but not sure if this is what I need or how to implement it in my case.
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Dec 17, 2009
i have the critical situation.i want to store the image in DB in android. but i don't know how to store image in db and how to get from db.i novice to android platform.so anyone give me the samplecode to develop my application.i tried more time but not i get the correct output.how to create the image field in SQLite db and how to insert the image within db.
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Mar 31, 2010
I have an array of 5 Timer objects in my app, some of wich have been scheduled with a TimerTask. I need to be able to store and load these 5 Timers; is there a way to save Objects? Maybe storing the address of the array would be enough? How could I do that?
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Dec 18, 2009
If I want to store the username and password to be used inside an Android application, what is the best way to do it? Is it through the preferences screen (but what if the user misses this?), or pop up a dialog box and ask the user for the credentials? If so, I do have to maintain state for the application. How would I do this?
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Mar 22, 2010
i am developing an application which uses sqlite db for storing records. I am developing this application on SDK 1.5.. when i test the application on 1.5 device it works good but when i try to run it on a 1.6 device i get a force close message with following logcat output:
03-19 09:31:35.206: ERROR/AndroidRuntime(224): Uncaught handler: thread main exiting due to uncaught exception..........................
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Oct 13, 2009
I am essentially using a listview but am looking at providing a bookmark functionality. I am thinking that I should store the item attributes in a file when bookmarked and retrieve when required to populate a bookmark listview.
I was wondering if there is a de facto standard used in achieving this or do I follow just the "writing into a file" and "reading from a file" when necessary style?
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Feb 19, 2010
I've got a common use-case wherein a user selects one item out of many (say, on a spinner or autocomplete list), then enters the data. For example, let's say the user selects a country. Ultimately, the data I want is the country code, not the country name; but the users will want to select based on name, not code. To put it another way, user's will select "United States", but I ultimately want that to translate into "US".
There are a lot of countries. Is there an easy way to setup a mapping in Android to hash from the name to the code? I've thought of a few solutions, none of them are quite satisfactory in my mind:
A database containing country/code, which I can query on. Setting up all countries as strings in strings.xml, then retrieving the resource by name. Creating a huge Map in code and using that. (This is the least satisfactory answer).
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Jul 14, 2010
I know only primitives can be stored in the android preferences, but do arrays count? Can I store an array of, say, Strings or booleans in an android preference?
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Apr 20, 2010
I have a static Preferences class that hold some application preferences and stuff like that. Is it ok to store reference to ApplicationContext there? I need that reference so i can get cache folder and stuff like that in classes that don't inherit Activity.
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Oct 14, 2010
I develop app and I need to store and read ( read every 60 seconds, store rare ) data. What is the most easy way to achieve this?
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Feb 27, 2009
I am currently trying to store an image into the sqlite database as a blob and retrieve it back.I am not sure if this is the correct approach since i dint find much of sample codes related to inserting images in sqlite. I am able to insert values but when i try retrieving them as byte using decodeByteArray it gives me the following error. DEBUG/skia(13003): xxxxxxxxxxx jpeg error 53 Not a JPEG file: starts with 0x%02x 0x%02x.The image retrieving query works fine as i have checked retrieving an image previously stored as blob in a sample database.I have tried storing and retrieving different image files but i am getting the same error.Could any one tell me as how to solve this problem
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