Android :: BitmapFactory.decodeByteArray Gives Pixilated Bitmap

Jan 30, 2010

I 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:...

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Android :: Bitmap From Camera Preview Using BitmapFactory.decodeByteArray

May 20, 2009

I'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?

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Android :: OutOfMemoryError At BitmapFactory.decodeByteArray

Jun 9, 2009

I 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);..........

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Android :: BitmapFactory.decodeByteArray() Returning NULL

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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Android :: BitmapFactory.decodeByteArray Returns Null

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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Android :: Use BitmapFactory.decodeStream To Specify Size Of Output Bitmap?

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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Android :: DecodeByteArray With WebService Image Always Null / Solution For This?

Oct 26, 2010

There what I am trying to do :

I am calling a WebService that send me back an image.
I get it from the entity.getContent() method.

Further in my code I try to use de BitmapFactory.decodeByteArray(myImage, 0, myImage.lenght) but the Bitmap that it returns me is always null

Does someone have an idea ?

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Android : Crop Bitmap Without Reading Entire Bitmap / Cannot Read Image Into Memory

Jul 21, 2010

I have a very large image and I only want to display a section the size of the display (no scaling), and the section should just be the center of the image. Because the image is very large I cannot read the entire image into memory and then crop it. This is what I have so far but it will give OutOfMemory for large images. Also I don't think inSampleSize applies because I want to crop the image, not lower the resolution.

Uri data = getIntent().getData();
Input Stream is = getContentResolver().openInputStream(data);
Bitmap bitmap = BitmapFactory.decodeStream(is, null, null);

Any help would be great?

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Android :: Create Mutable Bitmap From Camera - Draw Another Bitmap On Top - And Save It

Apr 2, 2009

I am 1) taking a picture and 2) then draw another Bitmap on top of it 3) then I store it

I am doing it as follows and it works on the emulator.

On the device I get a OutOfMemoryError: bitmap size exceeds VM budget android.graphics.Bitmap.nativeCopy(Native Method) android.graphics.Bitmap.copy(Bitmap.java:199) in the line copy the Bitmap to get a mutable Bitmap.

CODE:...........

What I am asking:

a) Is there a better way to do what I am doing? 1) take a picture 2) draw another Bitmap on top of it 3) then I store it

b) What is the best way to create a mutable Bitmap from the picture I just took with the camera?

In my app, resolution is not an issue. If it works better for small photos that would be fine.

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Android :: Overlay Bitmap - Draw Over A Bitmap

Oct 8, 2009

I have two questions actually:

Is it better to draw an image on a bitmap or create a bitmap as resource and then draw it over a bitmap? Performance wise... which one is better?

If I want to draw something transparent over a bitmap, how would I go about doing it?

If I want to overlay one transparent bitmap over another, how would I do it?

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Android :: Draw A Bitmap Rotated Onto Another Bitmap

Mar 22, 2009

My goal is the draw a bitmap onto another bitmap but rotated 90 degress. whats the most efficient way to do that. My current method is as follows which is horribly bad because it creates a new bitmap every time.

CODE:.....................

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Android :: OutOfMemoryError From BitmapFactory

Apr 28, 2009

Like 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:............

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Android :: Use BitmapFactory Optimisation

Nov 5, 2010

In 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.

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Android :: BitmapFactory Image From ZipFile

Aug 8, 2009

basically 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 {..............

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Android :: BitmapFactory.decodeStream Returns Null

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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Android :: Image Scaling By BitmapFactory.decodeResource()

Sep 17, 2009

I 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);
}

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Android :: BitmapFactory.decodeStream Thread Safe?

May 7, 2010

Is the BitmapFactory.decodeStream method thread safe?

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Android :: Out Of Memory Error In BitmapFactory.decodeFile

May 22, 2009

I 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:...............

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Android :: BitmapFactory.Options - Exceeds VM Budget

Nov 5, 2010

I'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...........

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Android :: Threaded BitmapFactory Image Decoding

Oct 15, 2010

Our 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?

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Android :: Draw Shape Or Bitmap Into Another Bitmap - Java - Android

Jun 22, 2010

I want to draw a shape(many circles particularly) into a Specific Bitmap. I have never used canvas / 2D graphs etc. As i see it i create a Drawable put the bitmap in it then "canvas-it" to the shapes i want etc.

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Android :: BitmapFactory: Decoder - Decode Returned False

Oct 27, 2009

For 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.

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Android :: InPurgeable Doesn't Work With BitmapFactory.decodeFile?

Apr 16, 2010

why 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).

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Android :: Cannot Decode Images From Sd Card Using BitmapFactory.Options

Jun 19, 2009

I 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..................

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Android :: BitmapFactory.decode And Exit Data In Images

Oct 19, 2010

I'm downsampling an image via BitmapFactory.decode then base64 encoding the bytes to ship to the server. (long story on the latter part of that formula) It seems this process nukes all Exif data in the image data. Am I approaching this the wrong way or is this a fact of life?

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Android :: BitmapFactory.decodeStream Returning Null When Options Set

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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Android :: Reduce Heap Size To Get Space For BitmapFactory.decodeFile

Nov 16, 2010

I learned from several discussions of this group that BitmapFactory.decodeFile() allocates heap memory outside of the "java heap". My app receives encrypted files from a remote server. Decoding those files needs a lot of heap space. After finishing this decoding step most of the allocated heap space will be freed by the GC. But the (total) heap size - as displayed by the DDM - remains large. In this situation there is not enough heap space outside of the "Java heap" to decode even medium sized image files using BitmapFactory.decodeFile(). At the moment I limit the size of encrypted files to ensure that the Java heap space never increases to more than 10 MB. This ensures that there is enough memory for BitmapFactory.decodeFile(). But this is not very elegant.

Is it possible to tell the dalvik-vm to reduce the (total) heap size to have more space for decoding images or is there another solution?

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Android :: BitmapFactory.decodeFile Returns Null Even Image Exists / Why Is So?

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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Android : Maximum Size That VM Allocate For Loading A Image With BitmapFactory?

Mar 1, 2010

Some of you may met the same problem, I was using BitmapFactory.decodeStream, and got this exception: Code...

I know the reason is because the BitmapFactory is trying to decode an uncompressed version of a big image(in my situation, jpg). I can use BitmapFactory.Options.inSampleSize to fix it. but my question is what's the maximum size that VM would like to allocate for loading a image with BitmapFactory? so I can do some scale before it loads.

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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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BitmapFactory - (decode Returned False) For Internal Image Files Extracted From Zip

Apr 19, 2012

Need to display images downloaded and extracted from a zip into the "/files" directory of the app. the images are getting in there properly as far as i can tell - i am able to extract them from the emulator and view/open them from my desktop. but every attempt, every variation of code i have found and tried so far has failed (Tag: skia / Text: --- decoder->decode returned false).

My latest construct, which does work for image files downloaded separately and uncompressed :

Code:

String imgFile = new File(getFilesDir(), "myImage.jpg").getAbsolutePath();
ImageView myImageView = new ImageView(this);
Bitmap bm = null;
try{
bm = BitmapFactory.decodeFile(imgFile);
myImageView.setImageBitmap(bm);
} finally{
mainLayout.addView(myImageView);
}

And here is the construct i am using to handle the zip extraction. I assume this is where the problem lies but i am clueless as to what i could possibly do differently and to what effect:

Code:
ZipInputStream zis = new ZipInputStream(fis);
BufferedInputStream in = new BufferedInputStream(zis, 8192);
ZipEntry ze;
while ((ze = zis.getNextEntry()) != null){
File dest_file = new File(getFilesDir(), ze.getName());

[code]....

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Android :: Draw On Bitmap

Nov 11, 2010

I'm trying to figure out how to draw on a bitmap in android, and keep a copy of these changed bitmaps for an undo function.

Bitmap b = ...
Paint p = new Paint();
canvas.drawBitmap(b, new Matrix(), null);
canvas.drawCircle(0,0,20,20);
//does Bitmap b have the circle drawn on it next time?

Or how do I get the bitmap after its been drawn on with the canvas(I want to preserve a stack of bitmaps with the changes applied by canvas drawing)? Maybe I'm going about this entirely wrong.

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Android :: Trying To Grayscale Bitmap?

Apr 20, 2009

I am trying to grayscale bitmap as follows, But it is crashing as soon as I run this method.

The problem is in last line. How can I assign "int" to "Color"? Or are there any better ways?

CODE:................

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Android :: Getting Bitmap From TextView

Jun 13, 2010

I want to get the bitmap that is drawn when a textview is displayed but without displaying the textview in the activity. something like this:

TextView t = new TextView(this);
t.forceToDrawItself();
Bitmap b=t.getViewBitmap();

how is this possible?

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Android : How To Put Bitmap On Top Of A Button?

Apr 21, 2009

Does anybody knows how can I put a Bitmap on top of a button, but without taking the whole surface?

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Android : Best Way To Resize Bitmap

Sep 10, 2009

I want to resize a bitmap and write to a file. what's the best way to do that?

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Android : How To Merge Two Bitmap Into One

Mar 15, 2010

I have two different bitmap. Can I merge these two bitmap into one?

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Android :: Passing Bitmap To Another Activity

Jun 7, 2010

I have a Bitmap image and i want to forward the bitmap to another activity. I have two activities Activity A and Activity B. This is how I started the Activity B
startActivityForResult(new Intent(Activity A.this, Activity B.class), 120);
in activity B
private void forwardImage(Bitmap bit) {
Intent i = new Intent(MMS.this, Compose.class);
i.putExtra("MMS", bit);
setResult(RESULT_OK, i);
finish(); }

This is not forwarding to Activity A but if I put a String to the intent it'll forward. This is how I listen to result in Activity A

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
// super.onActivityResult(requestCode, resultCode, data);
switch (resultCode)
case RESULT_OK: Intent intent = getIntent();
Bitmap bitmap = (Bitmap) intent.getParcelableExtra("MMS");
mmsImage.setImageBitmap(bitmap);
default: break;
} }

How can I pass a bitmap.

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Android :: Write Comment On Bitmap

Nov 22, 2010

I have a bitmap displayed on ImageView now i want to give a facility to write comment typed by the user on that bitmap.i tried using Canvas canvas = new Canvas(srcBitmap); canvas.drawText("Hello", 100,100,null);but this is giving me following error java.lang.IllegalStateException: Immutable bitmap passed to Canvas constructor later on i want to save this whole image a bitmap.

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Android :: Replace Any Colour In Bitmap Possible?

Oct 28, 2010

Is there an easy way to replace a colour in a bitmap?

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Android :: Converting Bitmap To Grayscale

May 20, 2009

I would like to convert a Bitmap to a grayscale array of bytes (one byte per pixel). At the same time I want to just crop at section from the middle. Having looked though the various api's it is not clear to me what the best way would be.

1) What is ALPHA_8? is that grayscale? I have a feeling that the grayscale effect should be done via some "saturation" on the paint object, right?

2) once I have the Bitmap in grayscale and the right size, what is the best way to get that to a byte[] of pixels (one byte per pixel)?

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Android :: Converting Bitmap To ASCII

Sep 17, 2010

I have a picture taken using the phone's camera and in bitmap format. I want to send it over HTTP usinf Http post in ASCII.Any idea how to do it?

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Android :: Why Bitmap Is Placed On An An Imageview Incorrectly?

Nov 23, 2010

this problem has been bothering me for days and I cannot figure out why on earth it is happening. I have a method that detects for a face, if a face is detected, the method will draw a rectangle on a canvas along the face.That part works fine.The problem is, when it displays to the image_view in my xml file, it will display on the far left middle of the image view, in a box, rather than in the center with the width as fill_parent.I thought of a possible workaround : to set the bitmap as a bitmapdrawable, but canvas only draws to bitmaps, so I can get the bitmapdrawable in the middle, but with no red box around it.I commented out my testing of bitmap drawable, and left it as what I have now...it only displays to my xml in the far left of the image_view.

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Android :: RuntimeException On Widget That Has A Bitmap

Aug 23, 2010

my app has widgets that have an ImageView and a TextView. On the onUpdate() method of the WidgetProvider, I put a Bitmap inside the ImageView this way:

CODE:..................

setColor() method is this:

CODE:..........

The problem is that sometimes the widget throws a RuntimeException because somebody has recycled the Bitmap, and I don't know what to do.

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Android :: Batch Getting Many Bitmap Resources?

Jan 24, 2010

I have a long series of graphics -- icon1_0.png, icon1_1.png, icon1_2.png..., icon12_0.png, icon12_1.png, icon12_2.png -- and I'd like to package them with my android application. Ideally I think I should be able to load them as resources but the resource id's are set up as java identifiers. Of course, java identifiers can't be assembled at runtime. I have to ask for R.drawable.icon12_00 so I cannot set up a loop

for(int icon=0;icon<12;icon++)
for(int frame=0;frame<3;frame++)
//syntax error obviously
BitmapFactory.decodeResource(getResources(), R.drawable."icon" + icon + "_" + frame + ".png");

So is there any way to get resources by their names? Better yet, is there a canonical way outside the resource system to pack data files into an android application package so that I can get at them? I'm thinking about reflection but that doesn't seem like the right solution to me.

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