Android项目实战（五十四）：zxing 生成二维码图片去除白色内边距的解决方案

目录：zxing->encoding->encodinghandler类 中修改 createqrcode方法

　　 private static final int black = 0xff000000;
    private static final int white = 0xffffffff;

    public static bitmap createqrcode(string str,int widthandheight) throws writerexception {
        string contentstoencode = str;
        if (contentstoencode == null) {
            return null;
        }
        map<encodehinttype, object> hints = new enummap<>(encodehinttype.class);
        //hints.put(encodehinttype.character_set, encoding);
        hints.put(encodehinttype.margin, 0); /* default = 4 */
        multiformatwriter writer = new multiformatwriter();
        bitmatrix result;
        try {
            result = writer.encode(contentstoencode, barcodeformat.qr_code , widthandheight, widthandheight, hints);
        } catch (exception e) {
            // unsupported format
            e.printstacktrace();
            return null;
        }

        int width = result.getwidth();
        int height = result.getheight();
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            int offset = y * width;
            for (int x = 0; x < width; x++) {
                pixels[offset + x] = result.get(x, y) ? black : color.white;
            }
        }

        bitmap bitmap = bitmap.createbitmap(width, height,
                bitmap.config.argb_8888);
        bitmap.setpixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }