Generating A Lot Of Objects?
Jun 15, 2013
I'm creating a 2d game and have run into another problem. I use array lists for generating everything that has multiple instances, background images, foreground images, enemies, etc. The problem I have is if I choose to generate any more than a certain number of any given object I get an arrayindexoutofboundsexception even though the code works fine with lower numbers. For the background images that are larger, the number seems to be lower (about 40). for enemies, which are smaller, the limit is more (about 150). I don't believe I'm out of memory as I'm not getting that error.
generation code
Y=0
last = 13
[Code]....
The above codes work if the variable is lower. But sends the error as soon as it goes above a certain number.
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Oct 26, 2010
The FAQ mentions a method of passing objects around activities. (It is not clear to me): "A HashMap of WeakReferences to Objects. You can also use a HashMap of WeakReferences to Objects with Long keys. When an activity wants to pass an object to another activity, it simply puts the object in the map and sends the key (which is a unique Long based on a counter or time stamp) to the recipient activity via intent extras. The recipient activity retrieves the object using this key.".................
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Jun 15, 2010
I have an application that have a Google map on Google Android 1.5 since we have been working on the application for a long time, we are not in stage of upgrading to the newest framework, so we are using 1.5. Now, I have map locations that are dynamically generated and drawn on the map at run-time to visualize some streams, Up to this point the application is working fine, Now my problem is that I am trying to filter the objects ( addresses) to visualize only the on-screen ones. I do NOT want to visualize the addresses that are off-screen. The way I am trying to do this is to check the screen-coordinates of each object (address) before visualizing it, then it the coordinates (x,y) more than (0,0) and less than (320, 460). I should visualize it. I am trying to use this approach, but it is not working for some reasons, I have tried many posts but could not understand why, there must be something missing somewhere that I am not aware of.
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Dec 8, 2009
Suddenly my R file has stopped generating. It has deleted itself and won't come back. In eclipse, I have all the latest updates to the sdk and the plugging. Has this ever happened to anyone else before, how do you fix it?! I have tried restarting, cleaning the project, rebuilding, doing the Android->fix project properties.
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Jun 23, 2010
I am trying to publish my first Android application, and therefore need to sign the app with a keystore. At first everything goes well. I type the following into the command prompt: keytool -genkey -v -keystore testKeystore.keystore -alias testKeystore -keyalg RSA -validity 10000. I answer the several questions that follow, but after the last question, I get the following error. keytool error: java.io.FileNotFoundException: testKeystore.keystore [Access is denied] Maybe I am doing some silly mistake, but I have followed several guides on the internet on how to make a keystore, and I thought that was all there was to it?
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Sep 23, 2010
I'm trying to generate the MD5 Fingerprint I will use with the release of my application. I used Eclipse to Compile and Sign my application, which gave me a keystore file and a .apk file. Now i need to generate the MD5 for my MapViews. I tried using the cmd prompt to generate it, but everytime it states that no such file exists. Is there somewhere special i need to be storing the keystore so the keytool has access to it? Also, once i get the MD5 fingerprint, all i have to do is insert it and re-compile and sign my application (the same way i previously did it). Am i correct on that assumption? I've read through the developer docs and I'm still unclear on the whole process.
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Jun 5, 2012
I generated a new android project in eclipse. I then copied all the files from chapter 3 in my book over to the project. After doing so the R.anything is not available and the resource file is missing. I try to clean the project and generate it but it isn't working. What I can do to fix this error?
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Jun 12, 2010
I'm very new to java and am working on my first Android app. I am using the webview demo as a template. I am trying to generate a random integer between 1 and 12 and then call a certain javascript function based on the result. Here's what I have:
int number = 1 + (int)(Math.random() * ((12 - 1) + 1));
number = (int) Math.floor(number);
String nextQuote = "javascript:wave" + number + "()";
mWebView.loadUrl(nextQuote);
So mWebView.loadUrl(nextQuote) will be the same as something like mWebView.loadUrl("javascript:wave1()") I just want to know if what I have here is correct and will work the way I think it will. The application isn't responding as expected and I suspect this bit of code is the culprit.
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Aug 1, 2010
I was just wondering, theres a lot of people who sell unlock codes for htc. But they must get them from somewhere, somehow. were living in 21st century and everything can be hacked / cracked, so is there a tool similar to a KeyGen which can generate unlock codes for htc? I think there must be one somewhere.
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Mar 29, 2009
I renamed the package in the manifest from com.a to com.a.beta in order to upload a different version to the Android Market.
In the manifest I changed the referenced entities (services, activities etc.) to use the fully qualified name "com.a.X" instead of just ".X". Of course the code still references com.a.R, so there is lots of errors in Eclipse. My expectation would have been though that R.java will be regenerated in com.a.beta. But it is not generated at all.
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Dec 8, 2009
After i created my project. The R file is not generating. I need to build the application to create that R file. After i add any image or string. It is not automatically adding in R file. I need to build another time to generate that code in R file. what is the reason?
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Jun 3, 2010
I am trying to add some updates to an already released application but something has happened with my workspace that prevents me from Running or Exporting the application. I keep getting the following code...
You think it would be an easy fix but I looked into the HDPI drawables folder and there were no doubles. I even went as far as to delete the entire folder and the error still appears. Anyone got any clever ideas?
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Aug 12, 2010
I would like to be able to generate unique serial numbers for each Android device for use in unlocking an application. How could I do this? EDIT: The reason is I want to revamp a paid application and provide users who have paid for the old version, which will have a different package name, a way to obtain the full version by downloading an unlikable free version of the application. I would push an update to the old version that would generate and display the code that they could enter to turn the Free version into a fully functional version.
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Oct 2, 2010
I'm working on an Android class that extends MapActivity. I have set the OnTouchListener and everything works okay for the first MotionEvent. After the first MotionEvent, the system stops either generating MotionEvents or receiving them or both.
Does anybody know what I have to do to keep receiving MotionEvents?
CODE:............
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Jul 2, 2009
I have two questions:
1. How do you programmatically generate key strokes? I found some tutorials where it says to use IWindowManager, but that doesn't exist anymore in 1.5. (And WindowManager doesn't provide any function to generate key strokes)
2. How do you programmatically select one item from a ListView? Is it possible to do it with the index of the list item (it's position in the list)
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May 29, 2010
I put two projects into Eclipse, called Project1 and Project2.Project1 is independent, but Project2 must be dependent to Project1.When I build the Project2, the error msg comes like this: Error generating final archive: duplicate entry: AndroidManifest.xml
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May 22, 2014
kernel compiling with GCC 4.8 google toolcahin:
Got this error during generating bcmdhd module:
Quote:
CC [M] drivers/net/wireless/bcmdhd/wl_cfgp2p.o
drivers/net/wireless/bcmdhd/wl_cfgp2p.c: In function 'wl_cfgp2p_act_frm_search':
drivers/net/wireless/bcmdhd/wl_cfgp2p.c:769:31: error: array subscript is above array bounds [-Werror=array-bounds][code].....
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Nov 10, 2010
When I compile my Android Project I always get this Error:
Error generating final archive: duplicate entry: about.html
But I can't find any about.html in my Project.
Does anyone know how to solve the error?
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Sep 8, 2010
I am new to Android development. I want to know how you all manage objects. For eg we make object as A a = new A(); and then manage that object. But, here, we call A.class; My concern is that i don't want to call on Create(),nor do i want to push UI screen I just want to make 1 static object for 1 screen;and want to manage it throughout my application. that is, instead of calling A.class; can i call A a = new A(),and manage that object without pushing,and whenever i need i push that screen. Is there someway?
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Nov 12, 2010
Is there a way to pass an Array List of objects between activities? The myObject implements Parcelable and I'm able to successfully pass the objects around individually, but that means I need to have an exact amount of "myObjects" coded. I want this to dynamically grow/shrink by what the user does with the app. I have seen some posts on the web about doing:
Activity A
ArrayList<myObject> myObjArray = new ArrayList<myObject>();
Then when passing this into the intent I would use:
intent.putParcelableArrayListExtra("myObjArray", myObjArray);
Activity B
ArrayList<myObject> myObjArray = new ArrayList<myObject>();
Bundle extras = getIntent().getExtras(); myObjArray = extras.getParcelableArray("myObjArray");
However, the myObjArray always gets filled with "null". How can I achieve this?
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Aug 30, 2010
I want to pass an object from Activity B to Activity A. Scenario:
- Activity A calls Activity B
- User selects item in Activity B
- Activity B passes an object to Activity A
How do I accomplish this? And in which method do I read in the passed object in Activity A?
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Aug 7, 2009
I am new to this android stuff and SQLlite etc.I am going to log some numbers at a certain interval, and will put them into a dynamic histogram, by dynamic i mean that there will be a maximum number of samples in the histogram, the histogram and age stuff should be persisted either in db or plain file.For simplicity, I would like the samples to be stored in a blob type datafield, but i cannot se if this is possible. Alternative i could have another table with the samples Or I could simply have files with filename = name and content = samples.my concern might be unclear by now, but put simply, what is most effecient regarding power usage?
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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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Oct 20, 2009
I have been able to draw a map using 'MapActivity' class. Am unable to render 3D graphics on the Map. Is there any way to draw something on the foreground with the Map as the background?
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Mar 19, 2009
Is there any way for an Android application to retrieve some sort of Collection object that contains references to all of the GUI elements which are currently on the phone's screen? This could be very useful for testing purposes and so on. If I have overlooked a well-known class or library, please let me know.
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Nov 18, 2009
I have a class like class My data{ String name; int data; Location[] locality.
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May 31, 2009
I am writing a game using OPENGL, there are several 3D objects in my surface view. My question is: Should each 3D object implement view in order to get touch events? Or there is other way to do this?
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Jul 22, 2010
I have a game object that I save like this in OnPause()try {final ObjectOutputStream os = new ObjectOutputStream(openFileOutput(gameName + ".sav", 0)); os.writeObject(gameObject); os.reset();} catch (final Exception e) {e.printStackTrace();This works fine except on some of the older or slower phones it can sometimes take too long to complete. I end up getting a ANR (Activity Not Responding) error. I would like to move this to a thread to prevent blocking the UI. However when I try this I run into multiple problems.First openFileOutput is only available in my activity. I worked around this by passing the ObjectOutputStream to the thread. After that I could save the object but later when I tried to reload I get a java.io.EOF Exeception. does anyone have a good pattern for writing objects to a file from a thread?
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Nov 22, 2010
I need to pass a reference to the class that does the majority of my processing through a bundle. The problem is it has nothing to do with intents or contexts and has a large amount of non-primitive objects. How do I package the class into a parcelable/serializable and pass it to a startActivityForResult?
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Aug 19, 2010
I am trying to add an object to an arraylist but when I view the results of the array list, it keeps adding the same object over and over to the arraylist. I was wondering what the correct way to implement this would be.
CODE:..............
I have double checked my JSONArray data and made sure they are not duplicates. It seems to keep adding the first object over and over.
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