com.google.zxing.qrcode.QRCodeWriter Java Examples

public static String qrCode(String totpSecret, RealmModel realm, UserModel user) {
    try {
        String keyUri = realm.getOTPPolicy().getKeyURI(realm, user, totpSecret);

        int width = 246;
        int height = 246;

        QRCodeWriter writer = new QRCodeWriter();
        final BitMatrix bitMatrix = writer.encode(keyUri, BarcodeFormat.QR_CODE, width, height);

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(bitMatrix, "png", bos);
        bos.close();

        return Base64.encodeBytes(bos.toByteArray());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}
 

public static @NonNull Bitmap create(String data) {
  try {
    BitMatrix result = new QRCodeWriter().encode(data, BarcodeFormat.QR_CODE, 512, 512);
    Bitmap    bitmap = Bitmap.createBitmap(result.getWidth(), result.getHeight(), Bitmap.Config.ARGB_8888);

    for (int y = 0; y < result.getHeight(); y++) {
      for (int x = 0; x < result.getWidth(); x++) {
        if (result.get(x, y)) {
          bitmap.setPixel(x, y, Color.BLACK);
        }
      }
    }

    return bitmap;
  } catch (WriterException e) {
    Log.w(TAG, e);
    return Bitmap.createBitmap(512, 512, Bitmap.Config.ARGB_8888);
  }
}
 

private Bitmap createQrCode(final byte[] contents) {
    final BitMatrix result;
    try {
        final QRCodeWriter writer = new QRCodeWriter();
        final Map<EncodeHintType,Object> hints = new EnumMap<>(EncodeHintType.class);
        hints.put(EncodeHintType.CHARACTER_SET, StandardCharsets.ISO_8859_1);
        final int size = Math.min(imageView.getWidth(), imageView.getHeight());
        result = writer.encode(new String(contents, StandardCharsets.ISO_8859_1), BarcodeFormat.QR_CODE,
                size, size, hints);
    } catch (WriterException e) {
        throw new RuntimeException(e);
    }

    final int width = result.getWidth();
    final int height = result.getHeight();
    final int[] pixels = new int[width * height];
    for (int y = 0; y < height; y++) {
        final int offset = y * width;
        for (int x = 0; x < width; x++) {
            pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
        }
    }

    return Bitmap.createBitmap(pixels, width, height, Bitmap.Config.RGB_565);
}
 

@Override
public void draw(Graphics2D g, int x, int y, int width) {
    Graphics2D g2d = (Graphics2D) g;
    AffineTransform oldt = g2d.getTransform();
    g2d.translate(x - 10 + (width - (int) (m_iWidth * scale)) / 2, y + 10);
    g2d.scale(scale, scale);

    try {
        if (m_qrMatrix != null) {
            com.google.zxing.Writer writer = new QRCodeWriter();
            m_qrMatrix = writer.encode(m_sCode, com.google.zxing.BarcodeFormat.QR_CODE, m_iWidth, m_iHeight);
            g2d.drawImage(MatrixToImageWriter.toBufferedImage(m_qrMatrix), null, 0, 0);
        } else if (m_barcode != null) {
            m_barcode.generateBarcode(new Java2DCanvasProvider(g2d, 0), m_sCode);
        }
    } catch (IllegalArgumentException | WriterException ex) {
        g2d.drawRect(0, 0, m_iWidth, m_iHeight);
        g2d.drawLine(0, 0, m_iWidth, m_iHeight);
        g2d.drawLine(m_iWidth, 0, 0, m_iHeight);
    }

    g2d.setTransform(oldt);
}
 

public static Bitmap generateBitmap(String content, int width, int height) {
    int margin = 5;  //自定义白边边框宽度
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    Hashtable hints = new Hashtable<>();
    hints.put(EncodeHintType.MARGIN, 0);
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    try {
        BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
      //  encode = updateBit(encode, margin);  //生成新的bitMatrix
        int[] pixels = new int[width * height];
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                if (encode.get(j, i)) {
                    pixels[i * width + j] = 0x00000000;
                } else {
                    pixels[i * width + j] = 0xffffffff;
                }
            }
        }
        return Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
    } catch (WriterException e) {
        e.printStackTrace();
    }
    return null;
}
 

public static Image encode(String data, int width, int height) {
    try {
        BitMatrix byteMatrix = new QRCodeWriter().encode(data, BarcodeFormat.QR_CODE, width, height);
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        bufferedImage.createGraphics();
        Graphics2D graphics = (Graphics2D) bufferedImage.getGraphics();
        graphics.setColor(Color.decode("#00adb5"));
        graphics.fillRect(0, 0, width, height);
        graphics.setColor(Color.BLACK);
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                if (byteMatrix.get(i, j)) {
                    graphics.fillRect(i, j, 1, 1);
                }
            }
        }

        return SwingFXUtils.toFXImage(bufferedImage, null);
    } catch (WriterException ex) {
        ex.printStackTrace();
        return null;
    }
}
 

public static Bitmap create2dBarcodeBitmap(String input, int size) {
	try {
		final QRCodeWriter barcodeWriter = new QRCodeWriter();
		final Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		final BitMatrix result = barcodeWriter.encode(input, BarcodeFormat.QR_CODE, size, size, hints);
		final int width = result.getWidth();
		final int height = result.getHeight();
		final int[] pixels = new int[width * height];
		for (int y = 0; y < height; y++) {
			final int offset = y * width;
			for (int x = 0; x < width; x++) {
				pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.WHITE;
			}
		}
		final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		return bitmap;
	} catch (final Exception e) {
		e.printStackTrace();
		return null;
	}
}
 

/**
     * 生成带logo的二维码
     *
     * @param content  条码文本内容
     * @param width    条码宽度
     * @param height   条码高度
     * @param logoPath 条码中logo的路径
     * @param fileType 文件类型，如png
     * @param savePath 保存路径
     */
    public static void encodeLogo(String content, int width, int height, String logoPath, String fileType, String savePath) throws IOException, WriterException {
        Charset charset = Charset.forName("UTF-8");
        CharsetEncoder encoder = charset.newEncoder();

        byte[] b = encoder.encode(CharBuffer.wrap(content)).array();
        String data = new String(b, "iso8859-1");

        Writer writer = new QRCodeWriter();
        BitMatrix matrix = writer.encode(data, QR_CODE, width, height);
        MatrixToLogoImageConfig logoConfig = new MatrixToLogoImageConfig(Color.BLACK, 10);
        MatrixToImageWriterEx.writeToFile(matrix, fileType, savePath, logoPath, logoConfig);


//        BitMatrix matrix = MatrixToImageWriterEx.createQRCode(content, width, height);
//        MatrixToLogoImageConfig logoConfig = new MatrixToLogoImageConfig(Color.BLUE, 4);
//        MatrixToImageWriterEx.writeToFile(matrix, fileType, savePath, logoPath, logoConfig);
    }
 

@RequireAnyAuthority
@RequestMapping(value = "/qr", method = RequestMethod.GET)
public void qrcode(HttpServletResponse response,
		@AuthenticationPrincipal JpaUserDetails jpaUserDetails)
		throws WriterException, IOException {

	User user = jpaUserDetails.getUser(this.jpaQueryFactory);
	if (user != null && StringUtils.hasText(user.getSecret())) {
		response.setContentType("image/png");
		String contents = "otpauth://totp/" + user.getEmail() + "?secret="
				+ user.getSecret() + "&issuer=" + this.appName;

		QRCodeWriter writer = new QRCodeWriter();
		BitMatrix matrix = writer.encode(contents, BarcodeFormat.QR_CODE, 200, 200);
		MatrixToImageWriter.writeToStream(matrix, "PNG", response.getOutputStream());
		response.getOutputStream().flush();
	}
}
 

public static Bitmap create2dBarcodeBitmap(String input, int size) {
    try {
        final QRCodeWriter barcodeWriter = new QRCodeWriter();
        final Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        final BitMatrix result = barcodeWriter.encode(input, BarcodeFormat.QR_CODE, size, size, hints);
        final int width = result.getWidth();
        final int height = result.getHeight();
        final int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            final int offset = y * width;
            for (int x = 0; x < width; x++) {
                pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.WHITE;
            }
        }
        final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    } catch (final Exception e) {
        e.printStackTrace();
        return null;
    }
}
 

private Image getQRImage() {
    if (qrImage == null) {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        int qrWidth = 500;
        int qrHeight = 500;
        BitMatrix byteMatrix = null;
        try {
            byteMatrix = qrCodeWriter.encode(getMLURL(), BarcodeFormat.QR_CODE, qrWidth, qrHeight);
        } catch (WriterException ex) {
            LOGGER.log(Level.WARNING, "Error writing QR code", ex);
        }
        qrImage = MatrixToImageWriter.toBufferedImage(byteMatrix);
    }
    WritableImage fxImg = new WritableImage(500, 500);
    SwingFXUtils.toFXImage(qrImage, fxImg);
    return fxImg;
}
 

public static Bitmap encodeToQrCode(String text, int width, int height){
    QRCodeWriter writer = new QRCodeWriter();
    BitMatrix matrix = null;
    try {
        matrix = writer.encode(text, BarcodeFormat.QR_CODE, 100, 100);
    } catch (WriterException ex) {
        ex.printStackTrace();
    }
    Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    for (int x = 0; x < width; x++){
        for (int y = 0; y < height; y++){
            bmp.setPixel(x, y, matrix.get(x,y) ? Color.BLACK : Color.WHITE);
        }
    }
    return bmp;
}
 

public void showQrImage(String uuid) {
    String uid  = null != uuid ? uuid : this.uuid;
    String url = "https://login.weixin.qq.com/qrcode/" + uid + "?t=webwx";
    final File output = new File("temp.jpg");

    //下载二维码
    File qrImage = HttpClientUtil.doGetImage(url);

    //控制台显示二维码
    Map<EncodeHintType, Object> hintMap = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
    hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    hintMap.put(EncodeHintType.MARGIN, 1);
    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

    String  qrContent  = readQRCode(qrImage, hintMap);
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    BitMatrix bitMatrix;
    try {
        bitMatrix = qrCodeWriter.encode(qrContent, BarcodeFormat.QR_CODE, 10, 10, hintMap);
        System.out.println(toAscii(bitMatrix));
    } catch (WriterException e) {
        e.printStackTrace();
    }
}
 

public static Bitmap generateBitmap(String content, int width, int height) {
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    Map<EncodeHintType, String> hints = new HashMap<>();
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    try {
        BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        int[] pixels = new int[width * height];
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                if (encode.get(j, i)) {
                    pixels[i * width + j] = 0x00000000;
                } else {
                    pixels[i * width + j] = 0xffffffff;
                }
            }
        }
        return Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
    } catch (WriterException e) {
        e.printStackTrace();
    }
    return null;
}
 

/**
 * 生成包含字符串信息的二维码图片
 *
 * @param outputStream 文件输出流路径
 * @param content      二维码携带信息
 * @param qrCodeSize   二维码图片大小
 * @param imageFormat  二维码的格式
 * @throws WriterException
 * @throws IOException
 */
public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException {
    //设置二维码纠错级别ＭＡＰ
    Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    //创建比特矩阵(位矩阵)的QR码编码的字符串
    BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
    // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
    int matrixWidth = byteMatrix.getWidth();
    BufferedImage image = new BufferedImage(matrixWidth - 200, matrixWidth - 200, BufferedImage.TYPE_INT_RGB);
    image.createGraphics();
    Graphics2D graphics = (Graphics2D) image.getGraphics();
    graphics.setColor(Color.WHITE);
    graphics.fillRect(0, 0, matrixWidth, matrixWidth);
    // 使用比特矩阵画并保存图像
    graphics.setColor(Color.BLACK);
    for (int i = 0; i < matrixWidth; i++) {
        for (int j = 0; j < matrixWidth; j++) {
            if (byteMatrix.get(i, j)) {
                graphics.fillRect(i - 100, j - 100, 1, 1);
            }
        }
    }
    return ImageIO.write(image, imageFormat, outputStream);
}
 

/**
 * Generate a QR code containing the given Wi-Fi configuration
 *
 * @param width the width of the QR code
 * @param wifiNetwork the Wi-Fi configuration
 * @return a bitmap representing the QR code
 * @throws WriterException if the Wi-Fi configuration cannot be represented in the QR code
 */
public static Bitmap generateWifiQrCode(int width, WifiNetwork wifiNetwork) throws WriterException {
    int height = width;
    com.google.zxing.Writer writer = new QRCodeWriter();
    String wifiString = getWifiString(wifiNetwork);

    BitMatrix bitMatrix = writer.encode(wifiString, BarcodeFormat.QR_CODE, width, height);
    Bitmap imageBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

    for (int i = 0; i < width; i++) {
        for (int j = 0; j < height; j++) {
            imageBitmap.setPixel(i, j, bitMatrix.get(i, j) ? Color.BLACK : Color.WHITE);
        }
    }

    return imageBitmap;
}
 

public Bitmap generateQRCode(String text) {
    Bitmap bmp = null;

    Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // H = 30% damage

    int size = 256;

    BitMatrix bitMatrix = null;
    try {
        bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, size, size, hintMap);

        int width = bitMatrix.getWidth();
        bmp = Bitmap.createBitmap(width, width, Bitmap.Config.RGB_565);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < width; y++) {
                bmp.setPixel(y, x, bitMatrix.get(x, y) == true ? Color.BLACK : Color.WHITE);
            }
        }
    } catch (WriterException e) {
        e.printStackTrace();
    }

    return bmp;
}
 

public Bitmap generate(String text, int width, int height) {
    if ((width <= 0) || (height <= 0)) return null;
    Map<EncodeHintType, Object> hints = new HashMap<>();
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
    try {
        BitMatrix bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        int[] pixels = new int[width * height];
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                if (bitMatrix.get(j, i)) {
                    pixels[i * width + j] = 0x00000000;
                } else {
                    pixels[i * height + j] = 0xffffffff;
                }
            }
        }
        Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
        bitmap = addLogo(bitmap);
        return bitmap;
    } catch (WriterException ex) {
        Timber.e(ex);
    }
    return null;
}
 

public void invite() {
    String buffer = group.getGroupBase64ID();
    int size = 200;
    Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    try {
        BitMatrix bitMatrix = qrCodeWriter.encode(buffer, BarcodeFormat.QR_CODE, size, size, hintMap);
        Bitmap image = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);

        if(image != null) {
            for (int i = 0; i < size; i++) {
                for (int j = 0; j < size; j++) {
                    image.setPixel(i, j, bitMatrix.get(i, j) ? Color.BLACK : Color.WHITE);
                }
            }
            Intent intent = new Intent(this, DisplayQRCode.class);
            intent.putExtra("EXTRA_GROUP_NAME", groupName);
            intent.putExtra("EXTRA_BUFFER", buffer);
            intent.putExtra("EXTRA_QRCODE", image);
            startActivity(intent);
            overridePendingTransition(R.anim.activity_open_enter, R.anim.activity_open_exit);
        }
    }catch(WriterException ignore) {
    }
    //}
}
 

private BitMatrix getQRMap(String username, String secret, String serverIp) throws WriterException {
    return new QRCodeWriter().encode(String.format(TOTP_URL_FORMAT,
            username,
            serverIp,
            secret),
            BarcodeFormat.QR_CODE, 128, 128);
}
 

/**
 * Create a new panel of a given size.
 * 
 * @param size
 *          panel width/height
 */
public QrPanel(int size) {
	this.size = size;
	qrCodeWriter = new QRCodeWriter();
	hintMap = new HashMap<EncodeHintType, Object>();
	hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
	hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
	image = BLANK;
}
 

/**
 * 创建二维码
 *
 * @param content   content
 * @param widthPix  widthPix
 * @param heightPix heightPix
 * @param logoBm    logoBm
 * @return 二维码
 */
public static Bitmap createQRCode(String content, int widthPix, int heightPix, Bitmap logoBm) {
    try {
        if (content == null || "".equals(content)) {
            return null;
        }
        // 配置参数
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 容错级别
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix,
                heightPix, hints);
        int[] pixels = new int[widthPix * heightPix];
        // 下面这里按照二维码的算法，逐个生成二维码的图片，
        // 两个for循环是图片横列扫描的结果
        for (int y = 0; y < heightPix; y++) {
            for (int x = 0; x < widthPix; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * widthPix + x] = 0xff000000;
                } else {
                    pixels[y * widthPix + x] = 0xffffffff;
                }
            }
        }
        // 生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);
        if (logoBm != null) {
            bitmap = addLogo(bitmap, logoBm);
        }
        //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
        return bitmap;
    } catch (WriterException e) {
        e.printStackTrace();
    }
    return null;
}
 

/**
 * 创建二维码
 *
 * @param content   content 待转换的字符串
 * @param widthPix  widthPix 输出结果bmp的宽（px）
 * @param heightPix heightPix 输出结果bmp的高（px）
 * @param logoBm    logoBm 中间的logo(默认大小为最终二维码大小的1/5)
 * @return 二维码bmp
 */
public static Bitmap createQrCode(String content, int widthPix, int heightPix, Bitmap logoBm)
{
    try
    {
        if (content == null || content.length() == 0)
            return null;
        // 配置参数
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 容错级别
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix,
                heightPix, hints);
        int[] pixels = new int[widthPix * heightPix];
        // 下面这里按照二维码的算法，逐个生成二维码的图片，
        // 两个for循环是图片横列扫描的结果
        for (int y = 0; y < heightPix; y++)
        {
            for (int x = 0; x < widthPix; x++)
            {
                if (bitMatrix.get(x, y))
                    pixels[y * widthPix + x] = 0xff000000;
                else
                    pixels[y * widthPix + x] = 0xffffffff;
            }
        }
        // 生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);
        if (logoBm != null)
            bitmap = addLogo(bitmap, logoBm);
        return bitmap;
    } catch (WriterException e)
    {
        Log.e("QrCodeHelper", "create qrcode error:" + e.toString());
    }
    return null;
}
 

/**
 * 创建二维码
 *
 * @param content   content
 * @param widthPix  widthPix
 * @param heightPix heightPix
 * @param logoBm    logoBitmap
 * @param foreColor 前景色
 * @param backColor 背景色
 * @return 二维码
 */
public static Bitmap createQRCode(String content, int widthPix, int heightPix, Bitmap logoBm, int foreColor, int backColor) {
    try {
        if (content == null || "".equals(content)) {
            return null;
        }
        // 配置参数
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 容错级别
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix,
                heightPix, hints);
        int[] pixels = new int[widthPix * heightPix];
        // 下面这里按照二维码的算法，逐个生成二维码的图片，
        // 两个for循环是图片横列扫描的结果
        for (int y = 0; y < heightPix; y++) {
            for (int x = 0; x < widthPix; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * widthPix + x] = foreColor;
                } else {
                    pixels[y * widthPix + x] = backColor;
                }
            }
        }
        // 生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);
        if (logoBm != null) {
            bitmap = addLogo(bitmap, logoBm);
        }
        //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
        return bitmap;
    } catch (WriterException e) {
        e.printStackTrace();
    }
    return null;
}
 

public static Bitmap encode(String str, int size) {
    try {
        // 判断URL合法性
        if (str == null || "".equals(str) || str.length() < 1) {
            return null;
        }
        Hashtable<EncodeHintType, String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        // 图像数据转换，使用了矩阵转换
        BitMatrix bitMatrix = new QRCodeWriter().encode(str,
                BarcodeFormat.QR_CODE, size, size, hints);
        int[] pixels = new int[size * size];
        // 下面这里按照二维码的算法，逐个生成二维码的图片，
        // 两个for循环是图片横列扫描的结果
        for (int y = 0; y < size; y++) {
            for (int x = 0; x < size; x++) {
                if (bitMatrix.get(x, y)) {
                    pixels[y * size + x] = 0xff000000;
                } else {
                    pixels[y * size + x] = 0xffffffff;
                }
            }
        }
        // 生成二维码图片的格式，使用ARGB_8888
        Bitmap bitmap = Bitmap.createBitmap(size, size,
                Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
        return bitmap;
    } catch (WriterException e) {
        e.printStackTrace();
    }
    return null;
}
 

private MCRContent getPNGContent(final String url, final int size) throws IOException {
    QRCodeWriter writer = new QRCodeWriter();
    BitMatrix matrix;
    try {
        matrix = writer.encode(url, BarcodeFormat.QR_CODE, size, size);
    } catch (WriterException e) {
        throw new IOException(e);
    }
    BufferedImage image = toBufferedImage(matrix);
    return pngTools.toPNGContent(image);
}
 

private void generateQR() {
    GoogleAuthInfo selectedEntry = _authInfos.get(_currentEntryCount - 1);
    _issuer.setText(selectedEntry.getIssuer());
    _accountName.setText(selectedEntry.getAccountName());
    _entriesCount.setText(String.format(getString(R.string.entries_count), _currentEntryCount, _authInfos.size()));

    QRCodeWriter writer = new QRCodeWriter();
    BitMatrix bitMatrix = null;
    try {
        bitMatrix = writer.encode(selectedEntry.getUri().toString(), BarcodeFormat.QR_CODE, 512, 512);
    } catch (WriterException e) {
        Dialogs.showErrorDialog(this, R.string.unable_to_generate_qrcode, e);
        return;
    }

    int width = bitMatrix.getWidth();
    int height = bitMatrix.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] = bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE;
        }
    }

    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    _qrImage.setImageBitmap(bitmap);
}
 

public static Image getQRCode(String value) {
    BitMatrix matrix;
    com.google.zxing.Writer writer = new QRCodeWriter();
    try {
        matrix = writer.encode(value, com.google.zxing.BarcodeFormat.QR_CODE, 100, 100);
        return (Image) MatrixToImageWriter.toBufferedImage(matrix);
    } catch (WriterException ex) {
        return null;
    }
}
 

private Optional<Image> generateQrCode(String address) {
	final QRCodeWriter qrCodeWriter = new QRCodeWriter();
	final int width = 300;
	final int height = 300;

	try {
		final BitMatrix byteMatrix = qrCodeWriter.encode(address, BarcodeFormat.QR_CODE, width, height);
		final BufferedImage qrCodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		qrCodeImage.createGraphics();

		final Graphics2D graphics = (Graphics2D) qrCodeImage.getGraphics();
		graphics.setColor(Color.WHITE);
		graphics.fillRect(0, 0, width, height);
		graphics.setColor(Color.BLACK);

		for (int i = 0; i < height; i++) {
			for (int j = 0; j < width; j++) {
				if (byteMatrix.get(i, j)) {
					graphics.fillRect(i, j, 1, 1);
				}
			}
		}

		return Optional.of(SwingFXUtils.toFXImage(qrCodeImage, null));
	} catch (WriterException e) {
		logger.error("Failed to encode local bluetooth address as a qr code", e);
		return Optional.empty();
	}
}
 

/**
 * Create and return your Image here.
 * NOTE: make sure, your class is public and has a public default constructor!
 *
 * @param tag    The dialog-fragments tag
 * @param extras The extras supplied to {@link SimpleImageDialog#extra(Bundle)}
 * @return the image to be shown
 */
@Override
public Bitmap create(@Nullable String tag, @NonNull Bundle extras) {
    String content = extras.getString(QR_CONTENT);
    if (content == null) return null;

    // Generate
    try {
        EnumMap<EncodeHintType, Object> hints = new EnumMap<>(EncodeHintType.class);
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);
        hints.put(EncodeHintType.CHARACTER_SET, "UTF8");
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE,
                1024, 1024, hints);
        int width = bitMatrix.getWidth(), height = bitMatrix.getHeight();
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                pixels[y*width + x] = bitMatrix.get(x, y) ? Color.BLACK : Color.WHITE;
            }
        }
        Bitmap qr = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
        qr.setPixels(pixels, 0, width, 0, 0, width, height);
        return qr;

    } catch (WriterException ignored) {}

    return null;
}