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POHow to actually see a Bitmap taken from an Android heap dump
 

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  1. POHow to actually see a Bitmap taken from an Android heap dump
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    <p>In the process of tracking severe memory issues in my app, I looked at several heap dumps from my app, and most of the time I have a HUGE bitmap that I don't know of.</p> <p>It takes 9.4MB, or 9,830,400 bytes, or actually a 1280x1920 image at 4 bytes per pixels.</p> <p>I checked in Eclipse MAT, it is indeed a byte[9830400], that has one incoming reference which is a <code>android.graphics.Bitmap</code>.</p> <p>I'd like to dump this to a file and try to see it. I can't understand where is it coming from. My biggest image in all my drawables is a 640x960 png, which takes less than 3MB.</p> <p>I tried to use Eclipse to "copy value to file", but I think it simply prints the buffer to the file, and I don't know any image software that can read a stream of bytes and display it as a 4 bytes per pixel image.</p> <p>Any idea?</p> <p>Here's what I tried: dump the byte array to a file, push it to /sdcard/img, and load an activity like this:</p> <pre><code>@Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { final File inputFile = new File("/sdcard/img"); final FileInputStream isr = new FileInputStream(inputFile); final Bitmap bmp = BitmapFactory.decodeStream(isr); ImageView iv = new ImageView(this); iv.setImageBitmap(bmp); setContentView(iv); Log.d("ImageTest", "Image was inflated"); } catch (final FileNotFoundException e) { Log.d("ImageTest", "Image was not inflated"); } } </code></pre> <p>I didn't see anything.</p> <p>Do you know how is encoded the image? Say it is stored into <code>byte[] buffer</code>. <code>buffer[0]</code> is red, <code>buffer[1]</code> is green, etc?</p>
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    1. COIsn't that just the native rendering cache? Do you run with hardware acceleration enabled?
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    2. COYes I do have HW acceleration. But that doesn't explain why my bitmap was upscaled 200% and why this huge bitmap is allocated in the heap, IMHO.
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    3. CODid you have any luck finding out what image it was? I too have such a rogue image that takes up 1.1 MB and seems to be coming from the android preloaded resources. When I look at the preview of the byte buffer using GIMP, I see a blue radial gradient image of size 1044x270.
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