Android : Are Primitive Types Garbage Collected In Droid?
Mar 18, 2010
I know this may be a dumb question, but my background is more in c++ and managing my own memory.
I am currently cutting down every single allocation that I can from one of my games to try and reduce the frequency of garbage collection and perceived "lag", so for every variable that I create that is an Object (String for example) I am making sure that I create it before hand in my constructor and not create temporary variables in simple 10 line functions... (I hope that makes sense)
Anyways I was working though it some more tonight and I realized that I a may be completely wrong about my assumption on garbage collection and primitive types (int, boolean, float) are these primitive type variables that I create in a 10 line function that gets called 20 times a second adding to my problem of garbage collection?
View 2 Replies
May 21, 2010
Is there any way to stop the garbage collector for some time?
View 2 Replies
View Related
May 25, 2009
I am developing a camera application , where the frame rate is important. However, camera uses a preview callback function which allocates a byte[] array of 230400 bytes, which makes it necessary for the garbage collection to step in. Can someone suggest me a way to avoid garbage collection stepping in?
View 10 Replies
View Related
Sep 1, 2010
I started having an issue a couple days ago (after not making any changes to any settings) where anything with the slightest hint of.bass sounds awful in the car. It sounds fine on headphones, and the same car adapter I use on the DX sounds just fine with other devices through the same speakers. Doesnt matter if I use Pandora or the native music app. What gives? I checked my audio effects settings already and no changes there help. Im baffled because all the things that could be wrong work fine with other devices.
View 7 Replies
View Related
May 28, 2009
I've been working with Android for well over a year now, but I still have trouble determining when different types of messaging/communication between processes/threads should be used. I'm mainly talking about broadcasting Intents, using AIDL for services, using Handlers to send messages and socket communication.
Many of these tools can be used to accomplish similar tasks, but which is better suited to particular situations?
View 3 Replies
View Related
Nov 8, 2009
Is there a way to use setType() and supply multiple broad types (like images and video)?
I'm using an ACTION_GET_CONTENT. It seems to be working with just comma-separated types.
View 2 Replies
View Related
Dec 21, 2009
I'm just wondering what types of accessories Droid users have bought. I have the Multimedia docking and the car dock both from Motorola. I bought them on the VZW website and got both for around $22 bucks each. I've been happy with both even though I haven't been driving much. Has anyone seen a car dock that doesn't block the camera? Mine does. I wanted to launch Qik or Ustream Broadcaster while I drive around. Just thought it would make for some cool video.
View 11 Replies
View Related
Sep 23, 2010
The stock gallery app sucks. Is there an app out there that let's me organize pics in different folders, and ideally allows me to encrypt or lock certain gallerys? I definitely do not like the way each gallery displays a preview picture on its cover.
View 3 Replies
View Related
Jun 22, 2010
Im trying to figure out if the Eris can only detect wireless routers with certain authentication types? My phone does not recognize my wireless router, yet all other mobile devices and laptops are able to see and connect just fine. I'm using WPA2 encryption type for the pw, which is over 30 chars. long. Is this an issue?
View 3 Replies
View Related
May 27, 2010
I have an app with about 15 threads. Most do mundane tasks and sleep most of their lives. Others collect information and cache it in hashmaps. The hashmaps grow to a moderate size and level out. The number of keys and size of value remains constant, but the contents of the values changes (at 33 keys per second average). When I start my app, I notice the garbage collection interval goes from minutes to once per second, and the amount of garbage is 700k+ each time. In fact as I was writing this, it caused my phone to reboot with an error "Referencetable Overflow". Here's my question: Are there any tricks to identifying which threads are producing the garbage, or even finding out more about what garbage they are producing?
05-26 22:08:57.052 W/dalvikvm( 1031): ReferenceTable overflow (max=512)
05-26 22:08:57.052 W/dalvikvm( 1031): Last 10 entries in JNI local reference table:
05-26 22:08:57.052 W/dalvikvm( 1031): 502: 0x449904a8 cls=Ljava/lang/String; (28 bytes)
05-26 22:08:57.052 W/dalvikvm( 1031): 503: 0x4494fda8 cls=Ljava/lang/String; (28 bytes)
05-26 22:08:57.052 W/dalvikvm( 1031): 504: 0x44a172c8 cls=Ljava/lang/String; (28 bytes)
05-26 22:08:57.052 W/dalvikvm( 1031): 505: 0x448c7900 cls=Ljava/lang/String; (28 bytes)........
View 2 Replies
View Related
Dec 14, 2011
I have a droid X and love it. It's been great and I'm a huge android fan. That being said, after the update from Android 2.2 to 2.3 (gingerbread), I lost the ability to connect to WEP-secured wifi signals. I know it's not just my wifi at home, but ANY WEP wifi... I've been to Starbucks, other people's houses, etc, and had the same issue. Other types of security work just fine, but it essentially means that 50% of the time I can't connect to wifi.
What specifically happens is the phone identifies the signal and asks if I'd like to log in. I type in the password, but the "connect" button is NEVER responsive... it has been greyed out so that I can only press cancel.
In general, I've had spotty connection with other wifi as well (It will work for a few minutes, lose the signal, find it again, work, rinse-and-repeat).
I've googled solutions. Most of the answers ask me to change the actual router settings. I CANNOT DO THIS as I am living in a shared apartment. It is not my router. Moreover, I know that it's not a router problem as I have encountered NUMEROUS routers (including my routers at home that I used all the time before the 2.3 update) that this happens with.
View 1 Replies
View Related
Feb 11, 2010
Was looking for some guidance here. I need to replace the garbage keyboard bundled with 1.6 for something else. Which in your opinion is the best replacement and why? Maybe some comparisons would help also. Oh, by the way i'm running a mytouch 3g!
View 28 Replies
View Related
Jul 29, 2009
I didn't use much Java before Android so my knowledge concerning the gc is marginal. Now I'm developing a highly physics-based game and therefore I need to do many calculations each time step and many (25) time steps per second. At the moment I'm almost only using local objects (float) in my methods, so I guess they are allocated every time the method is called (which might be, for example, 25*100 = 2500 times a second , for 100 objects with calculations on them). This causes massive activity of the garbage collector like freeing ~10000 objects every 1-2 seconds (taking ~200ms on a real device). Now I really want to optimize that because even there's no noticeable delay due to the GC (and the frame rate is constant), this seems just not well. But I read on many documentations concerning Java optimization, that there is not much to optimize in modern versions of (desktop) Java, because the GC is fast enough. Does this apply to Android, too? Does the compiler optimize anything like frequently, steady allocated objects (like floats)? What would be best practice: keep all local objects and allocate and free them all the time or use class-global objects, even if they are only used inside one particular method (which is bad programming style but conserves GC?
View 5 Replies
View Related
Jun 6, 2010
I'm writing an Augmented Reality codes that should works in realtime,
But the VM's garbage collection hinders my program's performance.
I checked my program's execution time for each in OnPrevFrame(byte[], Camera)
and it execution time increases from around 50ms to 120ms at just after each garbage collection.
I copied parts of logs below. (local time is just before and after of signal processing, and global time is time stamps for every onPreviewFrame() calling )Also I executed onPreviewFrame without any signal processing on it, but
the garbage collection is also carried showing debugging message around 60ms it spends for memory release.
Is this garbage collection come from releasing byte[] yuvs image data? ( i uses 320x240 thumb nail )
then this clearly comes from Java's limitation, so there will be no hope for improvement unless
I found a way to directly access camera device? do you think this is feasible? Hope listen to others' comments.
View 3 Replies
View Related
Jul 30, 2010
PDF, docx, xls, ppt. Is there an application on the market that allows me to view all these types of files? I have seen a few, but they all get crappy reviews. Anyone have one that works for them? Also, is it free or paid?
View 3 Replies
View Related
Jun 11, 2010
I have an issue with using contacts on my droid. From within 'contacts' i hit the 'display options' then selecting the email account I see the drop down for system contact groups-friends, family, coworkers. I am wondering if there is any way to create additional contact types or groups? As in I have a specific group of contacts from one website I want to add to a group--can you create a contact type or contact group?? I can't find the option when adding a new contact or when within the display options as mentioned before.
View 1 Replies
View Related
Aug 1, 2010
I'm trying to update part of a VBO with a call to glBufferSubData(). When I update from the start (0) of my existing shadow buffer, there is no problem, as the buffer starts reading from 0. The following will read 0 to y from the buffer and place it at 0 to y in the VBO: gl.glBufferSubData(GL11.GL_ARRAY_BUFFER, 0, y, mPositionBuffer);
However, if I want to update a portion of the VBO (not from 0) I run into a problem; The following doesn't work, since it will write the values from the start of the buffer (0 to y) into position x to x+y of the VBO:........................
View 1 Replies
View Related
Dec 28, 2009
I'm drawing a rect to a surfaceview. Nothing special, just a test like this, in the surfaceview-extended class:
private int mPosX = 0; private Paint mPaint = new Paint(); Code...
the rect just bounces around the screen. I'm watching DDMS, I still see the garbage collector being called, even with this simple draw loop. There is no other application code being executed.
I'm wondering if it's realistic to expect the gc to not be called at all if we take care to not allocate any objects during our draw loops. I'm trying to extend this example to do some smooth animations, but every once in awhile the gc is called and you can see the drawing stutter. Although none of my application code is allocating any new objects, I don't know what the underlying API is doing inside surfaceview etc, and I doubt we can control that. Just wondering if this is not possible, I'd prefer to abandon this game idea up-front if we can't guarantee smooth animation.
View 5 Replies
View Related
May 20, 2009
Hi, I have discovered while using DDMS that the basic OpenGL system calls in my code are allocating memory and causing the garbage collector to fire! It's not the system calls themselves causing the problem but the use of direct byte buffers to pass data in.
The direct byte buffers I use in calls such as glVertexPointer & glTexCoordPointer lead to java.nio calls to read the byte buffers, leading to objects of type org.apache.harmony.luni.platform.PlatformAddress being created.
These buffers are the same as in the example OpenGL code. I am creating a ByteBuffer using allocateDirect() and then creating an IntBuffer using ByteBuffer.asIntBuffer() to pass data to the OpenGL functions. The problem occurs as the system is reading the buffers.
Is there a way around this? Maybe using something other than direct byte buffers? It seems that using this method, OpenGL code of any complexity (ie a lot of OpenGL system calls in every frame) is doomed to pause a lot. I am aware that these calls should be kept to a minimum, but I still need to use a certain amount of them.
View 9 Replies
View Related
Mar 20, 2010
I'm performance tuning interactive games in Java for the Android platform. Once in a while there is a hiccup in drawing and interaction for garbage collection. Usually it's less than one tenth of a second, but sometimes it can be as large as 200ms on very slow devices. I am using the ddms profiler (part of the Android SDK) to search out where my memory allocations come from and excise them from my inner drawing and logic loops. The worst offender had been short loops done like,
for(GameObject gob : interactiveObjects)
gob.onDraw(canvas);........................
View 3 Replies
View Related
Apr 15, 2009
I have screen 1 of my app which I want to transition smoothly into screen 2.
I want the transition to be smooth but I don't mind a slight pause before or after the transition. Before the transition I dump a lot of objects that are no longer needed from screen 1.
However, as luck would have it (!), the garbage collection almost always takes place during the transition causing the frame rate to drop and the transition looks terrible :(
Is there a way for me to either force the garbage collection to complete before the transition or delay until after the transition is finished? I have tried System.gc() in various places but it doesn't seem to help performance.
View 2 Replies
View Related
Nov 24, 2010
I have a tight game loop in a separate thread where I paint a lot of things on the canvas.
When I paint the score to the canvas I use the following function code...
When I check allocations in ddms I see that .toString not totally unsurprising allocates a char array on each conversion from an Integer to a String. This array will eventually be claimed by the garbage collect and cause uneven rendering of frames on slow android devices.
Is there a better way of painting integers on a canvas that won't cause new allocations and garbage collects?
View 1 Replies
View Related
Jun 6, 2010
I may have got it wet after getting caught in a rainstorm Friday night. It wasn't soaking wet and the device never shut off but the x is on the water marker.
Side notes: BB 1.1 and q1.0 kernel.
View 3 Replies
View Related
Jan 3, 2010
I'm running into some issues with input events and garbage collection, or more precisely object allocation. I am creating a game and have pretty much got my head around the OpenGL environment. I've digested all the relevant material I could find regarding performance, memory allocation etc (and watched the excellent presentation by Chris Pruett - http://code.google.com/events/io/2009/sessions/WritingRealTimeGamesAn...). I've pretty much eliminated any object allocations after initial setup from my game (which is still in its infancy), but I'm still getting a bunch of GC calls, like this:...........................
View 6 Replies
View Related
Jul 6, 2010
I have a Service which uploads a big file to a webserver. This works fine on the emulator (android 2.1). But if i run it on a Nexus One Froyo phone it starts out fine. But after a while it is in an infinite GC loop. The whole phone becomes unusable:.........................
View 5 Replies
View Related
Apr 13, 2009
In my ListView, there's one line of code in my ViewBinder that causes lots of garbage collection as I scroll through the list, about every two seconds...
D/dalvikvm(16312): GC freed 13171 objects / 659576 bytes in 162ms D/dalvikvm(16312): GC freed 13122 objects / 654128 bytes in 129ms D/dalvikvm(16312): GC freed 13134 objects / 655416 bytes in 142ms D/dalvikvm(16312): GC freed 13129 objects / 654840 bytes in 129ms D/dalvikvm(16312): GC freed 13149 objects / 655000 bytes in 110ms D/dalvikvm(16312): GC freed 13150 objects / 655720 bytes in 127ms D/dalvikvm(16312): GC freed 13075 objects / 652256 bytes in 111ms D/dalvikvm(16312): GC freed 13232 objects / 659040 bytes in 136ms D/dalvikvm(16312): GC freed 13106 objects / 653920 bytes in 110ms D/dalvikvm(16312): GC freed 13155 objects / 655152 bytes in 110ms
The offending code is here, which formats a price for each item in the list: String price = cursor.getString(columnIndex); final float pricef = Float.parseFloat(price); price = new StringBuffer("$").append(String.format("%. 2f",pricef)).toString(); ((TextView)view).setText(price);
If I comment out the line with String.format, the garbage collection goes away. So what's the "right" way to do this to avoid allocations? That database field holds an unformatted text string which I'm trying to format into proper currency format (example: format "1.5" to "$1.50")
View 9 Replies
View Related
May 10, 2010
I made the connection between my service WCF and my app android. But i'm wondering if u have ideas about using complex types (classes created on the server side). should i implement the serialization process? or should i juts create the classes on my client side(android)
View 8 Replies
View Related
Nov 24, 2010
We can launch the app in two ways, 1 is form the app, clicking on device back button till we reach the android home screen and launching the app or 2nd is from the app we can click the device home button and then we can launch.
How can we differentiate these to launches? In 2nd type launch onrestart will be called, onrestart will be called in some other cases also. I want to do something in the 2nd type of launch. Can any one tel me how to do this...
View 1 Replies
View Related
Apr 8, 2010
http://androidplayground.net/web/
they have been spamming the market all day, hope someone can get them shut down.
View 1 Replies
View Related
Jul 2, 2009
I'm trying to make a ListView when every item in that list can be a different type of View. for example the list could be: 1. TextView 2. ImageView 3. MyCustomView
I understands that in order to make a list I need to use an Adapter. the problem is that the Adapter uses a single layout for all of the list items, which will not support the different views.
my goal is to make an abstract View list when I can dynamically add and removes items in that list (each item is a View or subclass of it).
View 4 Replies
View Related
