CODEWITHSUNDEEP
androidbitmap
mehdok
mehdok

Reputation: 1598

android BitmapFactory.decodeStream low quality

I'm trying to decode an inputstream to bitmap, the code is so simple :

Bitmap myBitmap = BitmapFactory.decodeStream(myStream);

BUT the quality of outputed bitmap is too low (sometimes, and sometimes the quality is good).

also the source has a good quality image.

i tried to play with Bitmap options but nothing changed:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inScaled = false;
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap myBitmap = BitmapFactory.decodeStream(myStream, null, options);

so, how can i get the full quality bitmap?

Update 1:

I use this picture for an animation, like below:

coverAnimationImage.post(new Runnable()
{
    Override
    public void run()
    {
        try
        {
            InputStream coverStream = getCoverStream();
            if(coverStream != null)
            {
                bookCover = BitmapFactory.decodeStream(coverStream);
            }
        }
        catch (Exception e)
        {
            //  no cover
        }
        coverAnimationImage.setImageBitmap(bookCover);
        mBackground = new ColorDrawable(Color.BLACK);
        if(Build.VERSION.SDK_INT >= 16)
        {
            coverAnimationLayout.setBackground(mBackground);
        }
        else
        {
           coverAnimationLayout.setBackgroundDrawable(mBackground);
        }
        if (flag)
        {
            ViewTreeObserver observer = coverAnimationImage.getViewTreeObserver();
            observer.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener()
            {
                @Override
                public boolean onPreDraw()
                {
                    coverAnimationImage.getViewTreeObserver().removeOnPreDrawListener(this);
                    int[] screenLocation = new int[2];
                    coverAnimationImage.getLocationOnScreen(screenLocation);
                    mLeftDelta = coverLeft - (screenLocation[0]);
                    mTopDelta = coverTop - (screenLocation[1]);
                    mWidthScale = (float) coverWidth / coverAnimationImage.getWidth();
                    mHeightScale = (float) coverHeight / coverAnimationImage.getHeight();
                    runEnterAnimation();
                    return true;
                }
            });
        }
    }
});

I think when i run the animation the BitmapFactory.decodeStream isn't finished it's job! is it possible? or any idea whats happening here?

Update 2: the image info

enter image description here

Update 3:

low quality image:

enter image description here

high quality:

enter image description here

memory monitor:

enter image description here

YouTube Video:

android BitmapFactory.decodeStream low quality

Update 4:

the code of getCoverStream :

protected InputStream getCoverStream() 
{    
    String fileName = getCoverAddress();
    InputStream in = null;
    ZipEntry containerEntry = mZip.getEntry(fileName);
    if (containerEntry != null) 
    {
        try 
        {
            in = mZip.getInputStream(containerEntry);
        } 
        catch (IOException e) 
        {
            Log.e(TAG, "Error reading zip file " + fileName, e);
        }
    }

    if (in == null) 
    {
        Log.e(TAG, "Unable to find file in zip: " + fileName);
    }

    return in;
}

Upvotes: 2

Views: 1660

Answers (1)

1owk3y
1owk3y

Reputation: 1202

It may not actually be an issue with BitmapFactory.decodeStream(), because decodeStream decodes full resolution data by default.

We see that you're using ZipEntry. It could be an issue of the stream not fully downloading, or the stream (getCoverStream) not being invoked.

Try mZip.getSize(); mZip.getCompressedSize(); mZip.getCrc(); in LogCat. Do the results vary on download attempts with different qualities? I'm trying to determine if the zip download is stopping after a certain amount of time, gives up, and then just displays the information it has etc

Upvotes: 2

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