Android :: BitmapFactory.decodeStream Thread Safe?
May 7, 2010Is the BitmapFactory.decodeStream method thread safe?
View 2 Replies
View 2 Replies
Android :: BitmapFactory.decodeStream Returns Null
Oct 3, 2009I have an activity which performs an image search, the results (URLs of thumbnails on the web) are rendered in a GridView. My GridView adapter class delegates creating the actual Bitmaps to an AsyncTask that loops to sequentially fetch the image content from each URL using HTTPClient, and creates the Bitmaps using:
BitmapFactory.decodeStream(entity.getContent()).
I found that the above method sometimes returns "null" silently instead of creating a Bitmap. The occurrences appear to correlate with larger stream sizes (I check this by logging entity.getContentLength()). However, if I put a breakpoint just prior to the decodeStream call & then resume immediately every time I hit it (i.e. pause briefly on each iteration), the Bitmaps are created perfectly every time. All the images are quite small (most <10K), so the download & decodeStream happens fairly quickly. There are never more than 10 images processed in one AsyncTask.
Android :: Use BitmapFactory.decodeStream To Specify Size Of Output Bitmap?
Jul 8, 2009I have the following code which I tried to build a Bitmap from an input stream and I want my output bitmap to be 20 x 20:
BitmapFactory.Options opts = new BitmapFactory.Options(); opts.outHeight = 20; opts.outWidth = 20;
InputStream stream = // an input stream to my image Bitmap bm = BitmapFactory.decodeStream(stream, null, opts);
But when I tried it, I do get a bitmap from the inputstream, but it does not scale it to 20x20 which I specified in the BitmapFactory.Options.
Android :: BitmapFactory.decodeStream Returning Null When Options Set
Mar 23, 2010I'm having issues with BitmapFactory.decodeStream(inputStream). When using it without options, it will return an image. But when I use it with options as in .decodeStream(inputStream, null, options) it never returns Bitmaps. What I'm trying to do is to downsample a Bitmap before I actually load it to save memory.
I've read some good guides, but none using .decodeStream.........................
Android :: BitmapFactory.decodeStream(inputStream) Always Return Null When Some Bytes Are Wrong
Aug 30, 2010I'm building an android app and I'm currently having trouble retrieving a bitmap from an URL.
Here is the code I'm using :
CODE:..........
Everything works fine when the picture's write but when some bytes are wrong, result gets null. I think it's basically expectable as it's written this in the doc of BitmapFactory.decodeStream :
If the input stream is null, or cannot be used to decode a bitmap, the function returns null. The stream's position will be where ever it was after the encoded data was read.
The problem is, my wrong picture is well interpreted by my web browser and I can do so on iPhone platform.
Is there a way to sort of ignore those wrong pixels? maybe with the option parameter?
Android :: Is SQLiteDatabase Thread-safe?
Dec 17, 2009Is the SQLiteDatabase thread-safe?
View 2 Replies View RelatedAndroid :: Why Is The UI Toolkit Not Thread-safe?
Nov 13, 2010As I read at many places this phrase "the Android UI toolkit is not thread-safe"
Why is that,just I want to understand .....
Android :: Safe To Keep Reference To A Thread In A Singleton?
Nov 15, 2010Let me give you the scenario.
Say that my first Activity that loads up, also creates a thread, which will run indefinitely in the background.
Now, if I move to another Activity, I assume that the thread that I initially created in the main activity will continue to run.
So, now to my main question - in order to manage this background thread from other Activities, is it safe to store a reference to that thread in a singleton object?
Android : Is It Safe To Launch / Activity From A Non-ui Thread?
Jul 21, 2010Suppose my activity ui-thread spawns a separate thread at some point. Is it safe for that new thread to fire off an Intent for launching a new activity?
View 1 Replies View RelatedAndroid :: Is SQLiteStatement - Prepared Statement - Thread-safe?
Sep 20, 2010I'm wondering whether prepared statements in Android (instances of SQLiteStatement) are thread-safe. In particular I'm asking with regard to the following scenario:
In a ContentProvider you create a pre-compiled insert statement during onCreate. Then, in the overriden insert method you make use of this statement by binding a set of parameters to it and calling executeInsert on it.
We know that a ContentProvider has to be written in a thread-safe manner. If SQLiteStatement does not bind parameters per thread, a concurrent call to the provider's insert method would alter the statement's bindings and result in unpredictable behavior.
Android's own Contacts provider uses prepared statements in this way (http://bit.ly/bDuKAT), so I tend to believe that they are in fact thread-safe. Looking at the source code of SQLiteStatement I don't see how though (http://bit.ly/9M1Swv).
So, is SQLiteStatement (or SQLiteProgram that is) thread-safe with respect to parameter binding or not?
HTC Incredible :: Thread Dedicated To The Safe Removal Of Apps
Jun 30, 2010I want to see a thread for my own sake and others on what apps people have removed and what is safe.In order to remove an app use these directions.Footprints: (I had to do a Nandroid backup after removing this becauuse maps would not load in navigation) some online have reported the same problem while others here said it worked for them) JUST BE SURE TO MAKE A BACKUP FIRST.Another app to watch for is Friendstream as people have reported problems with constant sync issues.(Also just a question when removing apps do you need to run the same command line ending with .odex?)
View 38 Replies View RelatedAndroid :: OutOfMemoryError From BitmapFactory
Apr 28, 2009Like many others here I'm getting OutOfMemoryError from BitmapFactory when decoding multiple bitmaps. I am sure I am not leaking memory. Here is the system log from a crash:............
View 23 Replies View RelatedAndroid :: Use BitmapFactory Optimisation
Nov 5, 2010In my app, I am creating a bitmap from its colors code like this :
CODE:...............
And often I get the outofmemoryerror: So how can I use the BitmapFactory optimisation to avoid this problem? because I don't have an input stream or a file, I only have an array containing my pixels.
Android : Java - Implement A Run Method Of Thread If Create A Thread Global
Sep 7, 2010How can I implement a run() method of thread if I create a Thread Global?
I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?
In the run() method I have to write the code to perform some action.
IF I can do it then please can anyone show me briefly how to do it particularly.
Android : Handle Messages Between The Main Thread(the Deafult UI Related Thread) And The User Created Gamethread
May 21, 2009I am writing an application in which i need to handle messages between the main thread(the deafult UI related thread) and the user created Gamethread.
The requirement is like this.
An activity(say "Activity_X") is setting the view by "setContentView(some "View_Y")". In "Activity_X" i have implemeted "onCreateOptionsMenu()" and "onOptionsItemSelected()" fucntions for creating menus & a switch case for action to be taken on selecting those menus.Menu has items like "resume/pause/zoom/" .
All action to be take on selecting these menus are implemented in "View_Y" in a separate Gamethread by extending "Thread" class.
So whenever a menu is selected in "Activity_X" i need to send a message to "View_Y". And on receiving this ,a particular action/method should be called in View_Y(GameThread).
How can i achieve this using Handlers?Is there any other way of doing this? Please do share with me some code snippets for these.
Android :: OutOfMemoryError At BitmapFactory.decodeByteArray
Jun 9, 2009I get a OutOfMemoryError at BitmapFactory.decodeByteArray when bitmap size is large; Following is the code snippet:
BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 8; Bitmap bitmap = null; bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);..........
Android :: BitmapFactory Image From ZipFile
Aug 8, 2009basically what i'm attempting to do is place several images into 1 zip file, and then read the images back out of the zip file, and draw them onto a canvas using BitmapFactory. This is what my code looks like, but when i debug i only get a source not found error.
Code: try {..............
Android :: Update ListView In Main Thread From Another Thread
May 27, 2010I have a separate thread running to get data from the internet. After that, I would like to update the ListView in the main thread by calling adapter.notifyDataSetChanged(). But it does not work. Any workaround for that?
View 1 Replies View RelatedAndroid :: Use Thread With SurfaceView - Ie Draw In Separate Thread?
Jul 22, 2009I want to do the drawing in another thread to speed up the game(it is way to slow right now). I was told to do this but don't quite understand why that would speed things up. Is it GameView that should implement Runnable? Should I make the thread sleep when not drawing? where should I start the thread? package com.android.WWS;
import android.app.Activity; import android.content.Context; import android.graphics.*; import android.os.Bundle; import android.view.SurfaceView; import android.view.KeyEvent; import android.view.View; import android.view.View.OnKeyListener; import java.lang.Runnable; import java.lang.Thread;...................
Android :: Image Scaling By BitmapFactory.decodeResource()
Sep 17, 2009I can't wait to try out the new 1.6 goodies, but first I'm retargeting my existing applications, and I decided to start with Daisy Garden. Changing to android:targetSdkVersion="4" caused the application to segfault on startup and discovered that the BitmapFactory.decodeResource method now performs scaling based on screen density. In this case the behaviour is unwanted - I'm loading a set of masks that are scaled later during composition. So I've quickly inserted the following method, which seems to perfectly mimic the previous behaviour:
private Bitmap loadBitmap(int resId) { BitmapFactory.Options options = new BitmapFactory.Options(); options.inTargetDensity = 1; options.inDensity = 1; return BitmapFactory.decodeResource(context.getResources(), resId, options);
}
Android :: BitmapFactory.decodeByteArray Gives Pixilated Bitmap
Jan 30, 2010I am working on an app that displays photos which are downloaded from Flickr. I obtain a Bitmap object from a byte array, which in turn is read from the relevant Flickr URL, as follows: Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); The problem is that the resulting bitmap is pixelated and I can't figure out why. To demonstrate, here is an example of a picture created via BitmapFactory.decodeByteArray versus the original picture obtained directly from the relevant Flickr URL:...
View 6 Replies View RelatedAndroid :: Out Of Memory Error In BitmapFactory.decodeFile
May 22, 2009I was reading in some other posts that some developers have the same Problem, but till now, no solution. its about the gallery: I have a string array with photos, but when the gallery does show the 2nd Picture it crash with:...............
View 7 Replies View RelatedAndroid :: BitmapFactory.decodeByteArray() Returning NULL
Jul 26, 2010I am using the previewCallback from the camera to try and grab images. Here is the code I am using
private Camera.PreviewCallback mPrevCallback = new Camera.PreviewCallback()
{
public void onPreviewFrame( byte[] data, Camera Cam ) {
Log.d("CombineTestActivity", "Preview started");
Log.d("CombineTestActivity", "Data length = "
+ data.length );
currentprev = BitmapFactory.decodeByteArray( data, 0,
data.length );....................................
Android :: BitmapFactory.Options - Exceeds VM Budget
Nov 5, 2010I've been reading about performance issues decoding Bitmaps and have received the OutOfMemoryError "Bitmap exceeds VM budget" issue when I would expect to not be out of memory and read online that this is a common problem referred to as a bug in the framework by many devs. Typically, I get the error mentioned above on my second pass. Let's say I load a somewhat sizable Bitmap successfully and then recycle it and even set the ref to null. When I call this same method a second time that does the work of loading my Bitmap(s) into memory...
I've read on previous posts here and elsewhere online that there are a few things that can be done with BitmapFactory.Options (for instance, providing an input buffer explicitly). But, before proceeding blindly in using what I've found, I'm hoping someone with more knowledge of these classes can shed a little more light...........
Android :: BitmapFactory.decodeByteArray Returns Null
Aug 18, 2010In my application I am converting base64 string to image.For that I initially converted base 64 file to byte array and later am trying to convert to images.
To convert to Images I am using the below code
File sdImageMainDirectory = new File("/data/data/com.ayansys.Base64trial");
FileOutputStream fileOutputStream = null;
String nameFile="Images";
try {.......................
Android :: Threaded BitmapFactory Image Decoding
Oct 15, 2010Our Android app does a lot of image decoding. We fetch a lot of images from the internet, local storage caches, etc. Up to now, these images are being decoded on the UI thread (using BitmapFactory.decodeX() methods). It's been causing some timeout crashes because the UI doesn't respond quickly enough to user input.
I could write a little AsyncTask that encapsulates decoding, but I'm not sure that's a good idea. Spawning threads is expensive, and that would be spawning and tearing down a ton of them. So what's the best way to put this on another thread? Do I need to go to the extent of writing a Service? That seems a little heavy-weight. Are there any solutions for this already out there?
Android :: BitmapFactory: Decoder - Decode Returned False
Oct 27, 2009For my current application I collect images from different "event providers" in Spain.
However, when downloading images from salir.com I get the following logcat output: 13970 Gallery_Activity
I Fetching image 2/8 URL: http://media.salir.com/_images_/verticales/a/0/1/0/2540-los_inmortale... 13970 ServiceHttpRequest
I Image [url] fetched in [146ms] 13970 skia D --- decoder->decode returned false
Searching for that error message didn't provide much useful results.
Android :: InPurgeable Doesn't Work With BitmapFactory.decodeFile?
Apr 16, 2010why when I load images from files using BitmapFactory.decodeFile and passing in a BitmapFactory.Options with inPurgeable set to true, I still get OutOfMemoryError? For example, doing the following many times, with lots of different resources works fine:
BitmapFactory.Options opts = new Options() opts.inPurgeable = true; bitmap = BitmapFactory.decodeResource(resources, resId, opts);
However, doing the following causes an OutOfMemoryError
BitmapFactory.Options opts = new Options() opts.inPurgeable = true; bitmap = BitmapFactory.decodeFile(myFile, opts);
In reality my code isn't as simple as outlined above. What I'm really trying to do is load a couple of bitmap resources draw them on a bitmap backed canvas, and then write this new bitmap to file, just so it can then be finally re-read into memory with the inPurgeable option set to true (using BitmapFactory.decodeFile).
Android :: Cannot Decode Images From Sd Card Using BitmapFactory.Options
Jun 19, 2009I am tring to get a image from the images stored on the sdcard of my Android but i am getting a skia error using BitmapFactory When I just take the image directly without using BitmapFactory class I get the image. But the purpose of using BitmapFactory is scaling down the image size by using inSample =4;
but I get skia as the error..................
Android :: Bitmap From Camera Preview Using BitmapFactory.decodeByteArray
May 20, 2009I'm using the Camera.PreviewCallback.onPreviewFrame to try to generate a bitmap from the byte array passed to that method. If I use BitmapFactory.decodByteArray it returns null. I'm assuming that the array is correctly formatted since the data just comes right from the camera, so what could the problem be?
View 9 Replies View Related