生成二维码生成时有时会大小不一样

[againTry]

你好，目前页面会切换支付方式显示对应二维码，发现生成的二维码大小会不一样，发现是白边的问题，在网上看到了别办的生成方式，有个去白边，可以共同学习下。 ` public static Bitmap createQRImage(String str, int width, int height, Bitmap logoBm) {

    try {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
       // hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix matrix = new QRCodeWriter().encode(str, BarcodeFormat.QR_CODE, width, height);
        matrix = deleteWhite(matrix);//删除白边
        width = matrix.getWidth();
        height = matrix.getHeight();
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (matrix.get(x, y)) {
                    pixels[y * width + x] = Color.BLACK;
                } else {
                    pixels[y * width + x] = Color.WHITE;
                }
            }
        }
        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        bitmap = addLogo(bitmap, logoBm);
        return bitmap;
    } catch (Exception e) {
        return null;
    }
}

/**
 * 删除白边
 * */
private static BitMatrix deleteWhite(BitMatrix matrix) {
    int[] rec = matrix.getEnclosingRectangle();
    int resWidth = rec[2] + 1;
    int resHeight = rec[3] + 1;

    BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
    resMatrix.clear();
    for (int i = 0; i < resWidth; i++) {
        for (int j = 0; j < resHeight; j++) {
            if (matrix.get(i + rec[0], j + rec[1]))
                resMatrix.set(i, j);
        }
    }
    return resMatrix;
}

/**
 * 在二维码中间添加Logo图案
 */
private static Bitmap addLogo(Bitmap src, Bitmap logo) {
    if (src == null) {
        return null;
    }

    if (logo == null) {
        return src;
    }

    //获取图片的宽高
    int srcWidth = src.getWidth();
    int srcHeight = src.getHeight();
    int logoWidth = logo.getWidth();
    int logoHeight = logo.getHeight();

    if (srcWidth == 0 || srcHeight == 0) {
        return null;
    }

    if (logoWidth == 0 || logoHeight == 0) {
        return src;
    }

    //logo大小为二维码整体大小的1/5
    float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
    Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
    try {
        Canvas canvas = new Canvas(bitmap);
        canvas.drawBitmap(src, 0, 0, null);
        canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
        canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);

        canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.restore();
    } catch (Exception e) {
        bitmap = null;
        e.getStackTrace();
    }

    return bitmap;
}`

[mox113]

有这个就可以直接生成了 都不需要这个库了 只需要zxing 多谢啦

[HolickABC]

@againTry 多谢

[pigff]

thks