zxing 生成二维码时减少空白区域

private static final int BLACK = 0xff000000;private static final int PADDING_SIZE_MIN = 20; // 最小留白长度, 单位: px public static Bitmap createQRCode1(String str, int widthAndHeight) throws WriterException {    Hashtable hints = new Hashtable();    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");    BitMatrix matrix = new MultiFormatWriter().encode(str, BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight, hints);    int width = matrix.getWidth();    int height = matrix.getHeight();    int[] pixels = new int[width * height];    boolean isFirstBlackPoint = false;    int startX = 0;    int startY = 0;    for (int y = 0; y < height; y++) {        for (int x = 0; x < width; x++) {            if (matrix.get(x, y)) {                if (isFirstBlackPoint == false) {                    isFirstBlackPoint = true;                    startX = x;                    startY = y;                }                pixels[y * width + x] = BLACK;            }        }    }    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);    bitmap.setPixels(pixels, 0, width, 0, 0, width, height); // 剪切中间的二维码区域，减少padding区域     if (startX <= PADDING_SIZE_MIN)        return bitmap;    int x1 = startX - PADDING_SIZE_MIN;    int y1 = startY - PADDING_SIZE_MIN;    if (x1 < 0 || y1 < 0) return bitmap;    int w1 = width - x1 * 2;    int h1 = height - y1 * 2;    Bitmap bitmapQR = Bitmap.createBitmap(bitmap, x1, y1, w1, h1);    return bitmapQR;}