private static final int REQUIRED_IMAGE_WIDTH = 480;

Bitmap decodeScaledBitmap(Uri image) {
    Size initialSize = getImageSize(image);

    int areaLimit = REQUIRED_IMAGE_WIDTH * REQUIRED_IMAGE_WIDTH;
    int targetWidth = (int) Math.sqrt((double) areaLimit * initialSize.width / initialSize.height);
    int targetHeight = (int) Math.sqrt((double) areaLimit * initialSize.height / initialSize.width);
    int sampleSize = calculateSampleSize(initialSize.width, REQUIRED_IMAGE_WIDTH);

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = sampleSize;
    options.inDensity = Math.max(initialSize.width, initialSize.height);
    options.inTargetDensity = Math.max(targetWidth, targetHeight) * sampleSize;

    try {
        InputStream input = getContentResolver().openInputStream(image);
        Bitmap bitmap = BitmapFactory.decodeStream(input, null, options);
        // reset density to display bitmap correctly
        if (bitmap != null)
            bitmap.setDensity(getResources().getDisplayMetrics().densityDpi);
        return bitmap;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    return null;
}

private Size getImageSize(Uri image) {
	InputStream input = null;
    try {
        input = getContentResolver().openInputStream(image);
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(input, null, options);
        return new Size(options.outWidth, options.outHeight);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    return new Size(0, 0);
}

private int calculateSampleSize(int currentWidth, int requiredWidth) {
	int inSampleSize = 1;
    if (currentWidth > requiredWidth) {
        int halfWidth = currentWidth / 2;
        // Calculate the largest inSampleSize value that is a power of 2 and keeps
        // width larger than the requested width
        while (halfWidth / inSampleSize >= requiredWidth) {
            inSampleSize *= 2;
        }
    }
    return inSampleSize;
}

static final class Size {
	int width;
    int height;

    public Size(int width, int height) {
        this.width = width;
        this.height = height;
    }

    @NonNull
    @Override
    public String toString() {
        return "width: " + width + ", height: " + height;
    }
}