Android : Leaking Bitmaps From Adapter's GetView
Mar 31, 2009
I definitely have a memory leak problem and i'm trying to figure out there. After 6-10 config changes i'm getting out of memory in regards to BitmapFactory. I'm kind of suspect that this is going on within adapter. I have a listview . ListItems are an thumbnail image ( ImageView ) and TextView for text.
Here is the getView code.
CODE:..................
And get ThumbnailBitmap() is basically BitmapFactory.decodeByteArray ..
Is it possible that i'm leaking drawables ? Heap is not increasing by the way .
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Jul 15, 2010
I have a list and i want to check is the view is returned so i can call loadingAnimation.start() to make a imageview insite listview animate
Let me tell you what i mean.. code...
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May 20, 2010
I have a ListView with custom ArrayAdapter. Each of the row in this ListView has an icon and some text. These icons are downloaded in background,cached and then using a callback, substituted in their respective ImageViews. The logic to get a thumbnail from cache or download is triggered every time getView() runs.
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Sep 23, 2010
My application uses a list of media files on the phone, i.e. images, audio and video. It also allows the user to filter the list via some checkboxes in a menu, so the user can choose to show or hide each type of files. The way I've been doing this is by putting this in the adapter's getView():
// don't show unwanted file types if (cmo.hasType(MediaType.AUDIO_FILE)){
if(!prefs.getBoolean(PREFS_SHOWAUDIO, true)){ return new ViewStub(mContext);;
} }else if(cmo.hasType(MediaType.IMAGE_FILE)){ if(!prefs.getBoolean(PREFS_SHOWIMG, true)){
return new ViewStub(mContext);;
} }else if( cmo.hasType(MediaType.VIDEO_FILE)){ if(!prefs.getBoolean(PREFS_SHOWVIDEO, true)){ return new ViewStub(mContext);; } }
Which is quite effective in the sense that the list doesn't show those elements. However, the ListView still renders a 1px grey line between each View, even if they are ViewStubs, meaning I see a thick gray line whenever a group of consecutive items are filtered away. How can I get rid of those lines? Should I create a new data array, containing only the elements that should show a view?
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Nov 14, 2010
I have made customAdapter (which extends BaseAdapter). I want to reuse the old views..
So I am checking:
CODE:........................
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Dec 17, 2009
I have a ClassLoader in Activity's onCreate which loads a specific class from a library, and is working fine, except that when activity is destroyed, the memory resources about the loaded class are not released.If the same activity gets created multiple times very quickly (by launching it, and destroying it by pressing the Back button), and the process doesn't happen to be killed by Android yet, the memory usage of the corresponding process grows continuously until the app crashes,and process dies.The problem is that this happens even if no objects are instantiated using the loaded class. There seems a problem with garbage collector, which doesn't seem to release resources about the loaded class on Destroy even if there are no references to it.If android would have killed the process right away when the last activity of the process gets finished, there wouldn't be a problem, but this is managed by Android system, and it doesn't always kill the process right away. A workaround may be to kill the process explicitly on destroy, but this is not encouraged way to do, as Android is supposed to manage the process.
An alternative is to have a functionality that allows a class to be unloaded onDestroy, but this doesn't exist. By design, the garbage collector is supposed to take care of this.Is there a solution regarding this?
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Dec 16, 2009
I'm trying to locate a memory leak in my app (it's client for a mediacenter). So I start it up, go to the screen that lists all movies, go back to my home activity, trigger the GC a few times manually via DDMS, dump the memory heap, pull it, convert it and load it into MIT in Eclipse.
Now the movie list screen is pretty heavy, around 800k of movie objects, which should be freed when I go back to the home screen. However, it stays allocated, with the GC root as a local variable in the main thread at ActivityThread.ContextCleanupInfo (see attached screenshot).
I've tried searching but there is no documentation on this class, not even in the source code. Is there any way to avoid this kind of behavior? Am I doing something wrong or is the problem in Android? My app is open source and can be checked out here[1]. http://code.google.com/p/android-xbmcremote/
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Mar 31, 2009
What would be the best way to debug a leaking program?
I have developed a media player (includes a background service doing the playing, and a UI, and I access getResources(), MediaStore and things like this often).
Whenever I rotate the screen or reenter the app the total memory allocated to my process grows some 70 to 100KB. After some 6-10 rotations it is dead due to an out of memory exception.
In the meantime I have removed every static modifier to global vars, added an onDestroy function that unregisters the intents and service connection (and even puts every global var to null again :P), but still the program memory grows... and dies after a few rotations.
Given the situation I even made the program stop right after just calling setContentView, and still the memory leaks:
CODE:......................
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Aug 7, 2009
http://developer.android.com/reference/android/app/Activity.html
The Activity Lifecycle could have implementation and or design bug: One case is to initialize a big image in onCreate(), try to reuse the image during the whole lifecycle, and then recycle the image in onDestroy(). Test showed that onCreate() is called every time one navigate away from the activity and back again, but onDestroy() is not called at all. This behavour causes memory leaking for the big image (size 960*1920). After 6+ times away and back to activity, the system runs out of memory and has to kill the process.
One workaround is to initialize the big image in onResume() and recycle in onPause(), but that's not so good reuse.
Could it be better to change the process (as shown in the diagram) a little bit such as: Call onDestroy() first when a process is killed?
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Nov 18, 2010
I created a simple app with a ListView following the ListActivity examples I found on the net.
The app has 2 activities with the first having a button to create the second. When i hit the close button on the second activity I would like it to release its memory (or at least allow it to be garbage collected).
Currently it will never release.
I must be doing something wrong here because the MyListActivity never gets released. Can anyone tell me if I am doing something wrong with the way my activities are created/destroyed? or if my usage of the ListView is wrong?
My App as a zip - http://www.mediafire.com/?l26o5hz2bmbwk6j
Screen Shot of Eclipse MAT showing the list activity never releasing memory - www.mediafire.com/?qr6ga0k
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Sep 28, 2010
I read the Avoiding Memory Leaks article with interest, and am concerned about danging references to the context object. I have a class like the following.
CODE:.........
Is it a problem to have a reference to a LayoutInflater object, since it must be using the context object somehow? Is there a better design pattern for what I'm trying to do here? (Use the context only to initially inflate the XML; from then on just use the View that's passed in to getView)
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Sep 1, 2010
I am new to Android development and have been following the tutorials available on the Android website. I am currently on the section of tutorials for Views, specifically the one for Grid Views: Hello, Grid View Tutorial.I am having trouble understanding how views are made through an adapter. I understand that you must override the getView() method in your adapter class and in this method is where you define how your Views are set up. What I don't understand is where does getView() actually get called? Perhaps I've got the wrong kind of mentality here, but in the code below (the Grid View tutorial) I don't see any calls to getView() (or any other things used in the adapter class such as getCount()).
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Oct 23, 2009
can anyone tell me any solution or tool provided by Android to find the exact place of memory leaking?
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May 7, 2010
I'm writing an app that has a foreground service, content provider, and a Activity front end that binds to the service and gets back a List of objects using AIDL. The service does work and updates a database.
If I leave the activity open for 4-8+ hours, and go to the "Running Services" section under settings on the phone (Nexus One) an unusually large amount of memory being used is shown (~42MB).
I figure there is a leak. When I check the heap memory i get Heap size:~18MB, ~2MB allocated, ~16MB free. Analyzing the hprof in Eclipse MAT seems fine, which leads me to theorize that memory is leaking on the stack. Is this even possible? If it is, what can I do to stop or investigate the leak? Is the reported memory usage on the "Running Services" section of android even correct (I assume it is)?
Another note: I have been unable to reproduce this issue when the UI is not up (with only the service running)
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Aug 20, 2010
I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead?
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Mar 8, 2010
I'm trying to change the content of a row in ListView programmatically. In one row there are 3 TextView and a ProgressBar. I want to animate the ProgressBar if the 'result' column of the current row is zero.
After reading some tutorials and docs, I came to the conclusion that LayoutInflater has to be used and getView() - overriden. Maybe I am wrong on this. code...
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Jul 19, 2010
I've made a customAdapter that accepts an ArrayList. The ArrayList contains a title and then a link. code...
I'm wanting to display the title and then have the on click listener to have the link. I'm having trouble however figuring out a way to do this.
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Aug 18, 2010
When I check my logs, when using ListView, I see, that getView() method of a custom adapter is continuously invoked on first 6 elements, even if I scroll to the very end of the list.
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Jan 5, 2010
I have a ListView displaying images on every element of the ListView, It works fine... but when I start to scrolling I have realized my image is downloaded again if it is displayed in the screen of my phone device!
How could I stop reloading the images or all the content of the in ListView again?
Or how could I avoid reading the getView() function again If I have already downloaded all its content?
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Mar 19, 2010
How to invoke the getView method in the baseAdapter in Android from another WebService Bean?
The adapter in my code as follows, I extends the base adapter code...
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Jul 2, 2010
The preference type of UI is used in many Google built-in applications for example Bluetooth , Wifi etc. And the getView of the preference is used to set the image or text to make it visible in the UI screen.
the getView for the pref type UI is defined as below in framework code : ->
CODE:..............................
Where the convertView is not getting recycled and every time whenever the user is scrolling the list up and down, convertVIew comes out to be null.Therefore by logic inflation of the UI also happens all the time in onCreateView().This is a kind of shortcoming in terms of memory utilization , hence in a discussion (MAKE YOUR UI FAST AND EFFICIENT) where Romain Guy has mentioned about the tricks to increase the app performance doesn't hold good for preference type of UI.
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Jun 28, 2009
If you derive a class from ArrayAdapter for the purpose of customizing the views of listview items, and you vary the background color of those items by doing something like this in getView()...
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Oct 1, 2010
I am writing a clock widget that uses customised bitmaps (so the widget loads the bitmap from the sdcard) Just have a couple of questions regarding how updates work:
1. if i want to display seconds on the clock widget will the widget load the bitmaps off the disk every second or can they be cached somehow so it doesn't reload off the disk each time. or If it does reload a bitmap each second, would this use a lot of power?
2. If i load the customised number bitmaps into a static array and then pass them as bitmaps to the widget would this use less power than just loading off the SD card?
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Jul 6, 2010
I have following example code:
Character c = CharacterFactory.getCharacter(CharacterEnum.SpecialCharacter); //factory has applicationContext reference to get bitmaps from R. ... Paint bitmapPaint = new Paint(); ... View::onDraw(Canvas canvas) ... canvas.drawBitmap(c.bitmap(), 0, 0, bitmapPaint);
For some reason (must be something simple) I do not see the bitmaps at the 0,0 of the canvas. Inspecting the bitmap and etc does not show anything obvious (nulls), I must have missed something. Is there something I should be paying particular attention to while drawing bitmaps?
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Aug 18, 2010
I am using the above code for displaying bitmap.and i also move that bitmap.Now my qusetion is how i am compare bitmap with another bitmap. Please give me some suggestions.
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Oct 15, 2010
I want to load bitmaps into ImageViews in Android, but I don't want to use the R.drawable syntax because I have a lot of images with a standard naming convention so it's much easier to get the image with some logic. For example, all my images are named:
img1.png
img2.png
img3.png
So if a user selects a value, let's say x, I show "img" + x + ".png" in the ImageView. Looks like Bitmap.decodeFile is what I need, but I need to know the syntax of how to get to my drawables folder since that's where the images are. Or if there's perhaps a better way.
I realize I could do this with a switch statement instead of concatenating the image name but that would be a lot of lines since I have so many images.
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Sep 9, 2010
I am struggling to get Bitmaps blurred using Android.
I have seen a lot of information about using a simple kernel like
0 0 0 5 0 0 0
0 5 18 32 18 5 0
0 18 64 100 64 18 0
5 32 100 100 100 32 5
0 18 64 100 64 18 0
0 5 18 32 18 5 0
0 0 0 5 0 0 0
My problem is that I am really not sure how to multiply this with my Bitmap in an efficient way. Should I go through every pixel and image.getPixel(x, y)
while storing those values to a new array (so I don't have to get those values over and over again) and then go through the array and for each value add up the surrounding values multiplied by the corresponding field in the kernel divided by 1068 (in the case of the above kernel (= all entries summed up))?
Is there any better way to do this? Is there a simple solution for the borders?
Or is there even something available in the Android SDK I missed?
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May 5, 2010
Anybody else thinking that the revs are being leaked deliberatly and they are using us to test them and find the bugs?
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Oct 31, 2013
I am having problems when scrolling a ListView. Each item in the ListView shows an image downloaded from internet.Whenever I scroll the ListView, it calls the method getView(int position, View convertView, ViewGroup parent), causing the image to be downloaded again.
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Jun 16, 2010
I am working on an application that downloads images from a url. The problem is that only some images are being correctly downloaded and others are not. First off, here is the problem code:
public Bitmap downloadImage(String url) {
HttpClient client = new DefaultHttpClient();
HttpResponse response = null;
try {.......................................
So what I have is a method that takes the url as a string argument and then downloads the image, converts the HttpResponse stream to a bitmap by means of the BitmapFactory.decodeStream method, and returns it. The problem is that when I am on a slow network connection (almost always 3G rather than Wi-Fi) some images are converted to null--not all of them, only some of them. Using a Wi-Fi connection works perfectly; all the images are downloaded and converted properly. Does anyone know why this is happening? Or better, how can I fix this? How would I even go about testing to determine the problem?
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