Android :: BitmapFactory.decodeStream(inputStream) Always Return Null When Some Bytes Are Wrong
Aug 30, 2010
I'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?
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Oct 3, 2009
I 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.
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Mar 23, 2010
I'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.........................
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May 7, 2010
Is the BitmapFactory.decodeStream method thread safe?
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Jul 8, 2009
I 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.
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Jul 26, 2010
I 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 );....................................
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Aug 18, 2010
In 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 {.......................
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Aug 2, 2010
Saving the file code...
The last line gives a null pointer exception, why is BitmapFactory.decodeFile returning null? I can verify that the file is getting saved correctly as I can pull it using adb and see the png displaying properly.
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Jan 28, 2010
I'm trying to get the ANDROID_ID on two different devices but it always return null on both. I'm using a Google Ion (aka HTC Magic) with firmware 1.6 and a Motorola Milestone with firmware 2.0.
I've been using this small sample to show the id, but it always shows null:
CODE:........................
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Sep 10, 2009
As the title says? Or what situations can cause this method to return null? I would of thought it retained this object always.
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Sep 10, 2010
Do the Android users have the chance to reset the NetworkProvider, so that the location will be null?
I came up with the idea, that its only possible to have that location null, after starting the device the very first time. But also than google will check the location right away for my opinion.
Sure, I'm implementing a default location for this rare case. I just want to know how seldom this case is.
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Jun 25, 2010
I am doing some android application. I just wonder what will case the managedQuery method return a null value?
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Dec 4, 2009
I wrote CustomView Class, and load it in layout. so i trid to find CustomView using findViewById() in activiy to get handle. but findViewById() was return null.
Written Code is like below:
CODE:.........
MapCanvas.java:
CODE:...............
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Apr 2, 2009
While doing debugging with Eclipse I noted that the debugger highlights the wrong line as "next line to execute" for methods with multiple return points. It fools the developer that the last line of the method is executed, where in fact it is not.Does anyone know if this is some kind of known issue? My colleagues have also experienced this but we have never seen it when doing on- device-debugging on e.g. the Sony Ericsson SDK.I couldn't find anything at http://code.google.com/p/android/issues/list There was a similar post in android-beginners 2007-11-25. No replies, though. http://groups.google.com/group/android-beginners/browse_thread/thread.
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Jun 27, 2010
I am trying to get the contacts from the phone but all I can get is the name, the phone numbers return null.
CODE:...............
After about 3 hours, I have figured it out:
CODE:...............
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Jan 14, 2010
I have asked this before, but I never got a response.
I would like to be able to feed an InputStream to the media player, but it does not look like there is any way to do that. The InputStream would feed encoded (mp3 or aac) data to whoever is calling read() on it. The issue is that I may have to stitch data together or I may not have all the data at the time I need to start playing back, but I can get it as the user continues playing.
I see MediaPlayer.setDataSource() for files, streams and URIs, but nothing that seems like an InputStream. I see the JetPlayer which is incredibly thin on documentation. I see AudioTrack, but that requires PCM as input.
So, I'm back to what to use or how I can work around this limitation.
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Nov 5, 2010
I connected to a server after then, to close InputStream and OutputStream call the code...
But, the streams is still alive. If I make once again, there are 2 different InputStream. Exception does not happen.
How to completely close the streams?
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May 18, 2010
I am trying to parse a Rss2.0 feed on Android using a Pull parser. code...
The prolog of the feed XML says the encoding is "utf-8". When I open the remote stream and pass this to my Pull Parser, I get invalid token, document not well formed exceptions.
When I save the XML file and open it in the browser(FireFox) the browser reports presence of Unicode 0x12 character(grave accent?) in the file and fails to render the XML.
What is the best way to handle such cases assuming that I do not have any control over the XML being returned?
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Aug 13, 2010
I have a binary file which contains keys and after every key there is an image associated with it. I want to jump off different keys but could not find any method which changes the index positioning in input stream. I have seen the mark() method but it does not jump on different places.
Does anybody have any idea how to do that?
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Apr 23, 2009
I captured an image by android G1, now trying to display it as ImageView but it gives me memory allocation exception.
CODE:.............
The default image resolution of G1 camera is 2048 * 1536
I also tried to compress image on selection but still same exception.
CODE:.............
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Aug 13, 2010
I have a 16mb binary file and I want to read bytes without using any loop. like if i want to read 16 byte i can pass 16 to some method(if there is any) and it give me my desired result... right now i am using loop for reading bytes but my application is so huge i am afraid that it do not get slow.
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May 24, 2010
I have a frame of 22 bytes. The frame is the input stream from an accelerometer via bluetooth. The acceleromter readings are a 16 bit number split over two bytes.
When i try to merge the bytes with buffer[1] + buffer[2], rather than adding the bytes, it just puts the results side by side. so 1+2 = 12.
How to combine these two bytes to obtain the original number. (btw the bytes are sent little endian)
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Nov 27, 2009
I'm trying to get a byte array of an image saved locally on the phone. I'm using the code...
How can I get the Bytes?
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Nov 12, 2010
Is it possible to get an InputStream (or file handler) to feed a SAX parser from an XML file stored at the Resources XML folder (instead raw Resources folder)?
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Feb 26, 2009
In my Android program, I have some code that downloads a file. This works fine, but since on a cell phone, you can be disconnected at any time, I need to change it do it reconnects and resumes the download when you are halfway through and somebody calls/you lose cell reception/etc. I cannot figure out how to detect the InputStream has stopped working. See the code...
And then my program just hangs on the while( (len1 = etc. I need to make it so when the Internet gets disconnected I wait for the Internet to be connected again and then resume the download.
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Mar 26, 2010
I have this piece of code which I'm hoping will be able to tell me how much data I have downloaded (and soon put it in a progress bar), and then parse the results through my Sax Parser. If I comment out basically everything above the //xr.parse(new InputSource(request.getInputStream())); line and swap the xr.parse's over, it works fine. But at the moment, my Sax parser tells me I have nothing. Is it something to do with is.read (buffer) section? code...
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Oct 31, 2010
I would like to know how to make a deep copy of an InputStream?
I know that we can do it with IOUtils packages but I would like to avoid it if possible.
Does anyone know how to make it please?
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Apr 8, 2009
For one of my apps I generate MIDI data on the fly. Is there any way to play MIDI data from a java.io.InputStream or directly from a byte []? So far I've only seen ways to do MIDI playback from files. Given the continuous and dynamic nature of my audio there is no way I can write it to a file first.
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Nov 24, 2009
I wrote a simple test driver to test the bluetooth apis. Anyone can verify whether I am using the API correctly?
Everything seems good but no data read:
Before calling the following, inquiry scan successfully returned, and the remote device is pre-paired.
CODE:..............
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May 27, 2010
I am using the AudioRecord class to analize raw pcm bytes as it comes in the mic.
So thats working nicely. Now i need convert the pcm bytes into decibel.
I have a formula that takes sound presure in Pa into db. db = 20 * log10(Pa/ref Pa)
So the question is the bytes i am getting from audiorecorder from the buffer what is it is it amplitude pascal sound pressure or what.
I tried to putting the value into te formula but it comes back with very hight db so i do not think its right
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