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androidimageurl
jiawen
jiawen

Reputation: 1208

How to get the image width and height from url without downloading the full image in Android?

Is there any way in Java to take image width and height without transfer or download?

mentions a way using ImageIO, but ImageIO is not available on Android.

Android has BitmapFactory, which can decode the image to get the width and height without loading the entire image to memory, but it only works with files.

So the question is on Android, is there a way to get just the image width and height from an web url without downloading the entire image?

Upvotes: 0

Views: 2293

Answers (2)

nikolai.serdiuk
nikolai.serdiuk

Reputation: 762

It is possible in Java, using ImageReader.getHeight(int) and ImageReader.getWidth(int) normally only reads the image header so image is not downloaded entirely, not sure it will work in Android:

public static Dimension getImageDimensionFromUrl(final URL url)
            throws IOException {

        try (ImageInputStream in = ImageIO.createImageInputStream(url.openStream())) {
            final Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
            if (readers.hasNext()) {
                final ImageReader reader = readers.next();
                try {
                    reader.setInput(in);
                    return new Dimension(reader.getWidth(0), reader.getHeight(0));
                } finally {
                    reader.dispose();
                }
            }
        }

        return null;
    }

Upvotes: 1

Jas
Jas

Reputation: 3212

It's not possible without downloading the image. BitmapFactory cannot be applied unless and until the image is downloaded.

Upvotes: 0

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