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Home/ Questions/Q 6607027
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T19:27:32+00:00 2026-05-25T19:27:32+00:00

Android has a method MediaStore.Images.Thumbnails.getThumbnail() which will return the thumbnail of any image. But

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Android has a method MediaStore.Images.Thumbnails.getThumbnail() which will return the thumbnail of any image. But I notice that the size of the thumbnail is limited to MICRO_KIND and MINI_KIND. How can I get thumbnails with whatever size I assigned?

Thanks in advance!

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  1. Editorial Team
    Editorial Team
    2026-05-25T19:27:32+00:00Added an answer on May 25, 2026 at 7:27 pm
    public static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight, boolean scaleUp) {
        int deltaX = source.getWidth() - targetWidth;
        int deltaY = source.getHeight() - targetHeight;
        if (!scaleUp && (deltaX < 0 || deltaY < 0)) {
            /*
             * In this case the bitmap is smaller, at least in one dimension,
             * than the target. Transform it by placing as much of the image as
             * possible into the target and leaving the top/bottom or left/right
             * (or both) black.
             */
            Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888);
            Canvas c = new Canvas(b2);
    
            int deltaXHalf = Math.max(0, deltaX / 2);
            int deltaYHalf = Math.max(0, deltaY / 2);
            Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf + Math.min(targetWidth, source.getWidth()), deltaYHalf
                    + Math.min(targetHeight, source.getHeight()));
            int dstX = (targetWidth - src.width()) / 2;
            int dstY = (targetHeight - src.height()) / 2;
            Rect dst = new Rect(dstX, dstY, targetWidth - dstX, targetHeight - dstY);
            c.drawBitmap(source, src, dst, null);
            return b2;
        }
        float bitmapWidthF = source.getWidth();
        float bitmapHeightF = source.getHeight();
    
        float bitmapAspect = bitmapWidthF / bitmapHeightF;
        float viewAspect = (float) targetWidth / targetHeight;
    
        if (bitmapAspect > viewAspect) {
            float scale = targetHeight / bitmapHeightF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        } else {
            float scale = targetWidth / bitmapWidthF;
            if (scale < .9F || scale > 1F) {
                scaler.setScale(scale, scale);
            } else {
                scaler = null;
            }
        }
    
        Bitmap b1;
        if (scaler != null) {
            // this is used for minithumb and crop, so we want to filter here.
            b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), scaler, true);
        } else {
            b1 = source;
        }
    
        int dx1 = Math.max(0, b1.getWidth() - targetWidth);
        int dy1 = Math.max(0, b1.getHeight() - targetHeight);
    
        Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, dy1 / 2, targetWidth, targetHeight);
    
        if (b1 != source) {
            b1.recycle();
        }
    
        return b2;
    }
    
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