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

Question

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.

It takes 9.4MB, or 9,830,400 bytes, or actually a 1280x1920 image at 4 bytes per pixels.

I checked in Eclipse MAT, it is indeed a byte[9830400], that has one incoming reference which is a android.graphics.Bitmap.

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.

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.

Any idea?

Here's what I tried: dump the byte array to a file, push it to /sdcard/img, and load an activity like this:

@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");
    }
}

I didn't see anything.

Do you know how is encoded the image? Say it is stored into byte[] buffer. buffer[0] is red, buffer[1] is green, etc?

Answer 1

See here for an easier answer: MAT (Eclipse Memory Analyzer) - how to view bitmaps from memory dump

TL;DR - Install GIMP and load the image as raw RGB Alpha