2020-08-28 android 生成二维码

  1. 注入开源库 implementation 'com.google.zxing:core:3.3.0'

  2. 二维码生成标准utils


public class QRCodeUtil {
 
    private static int IMAGE_HALFWIDTH = 50;//宽度值,影响中间图片大小
 
    /**
     * 生成二维码,默认大小为500*500
     *
     * @param text 需要生成二维码的文字、网址等
     * @return bitmap
     */
    public static Bitmap createQRCode(String text) {
        return createQRCode(text, 150);
    }
    /**
     * 生成二维码
     *
     * @param text 需要生成二维码的文字、网址等
     * @param size 需要生成二维码的大小()
     * @return bitmap
     */
    public static Bitmap createQRCode(String text, int size) {
        try {
            Hashtable hints = new Hashtable<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix bitMatrix = new QRCodeWriter().encode(text,
                    BarcodeFormat.QR_CODE, size, size, hints);
            int[] pixels = new int[size * size];
            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;
                    }
                }
            }
            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;
        }
    }
    /**
     * 生成带logo的二维码,默认二维码的大小为500,logo为二维码的1/5
     *
     * @param text    需要生成二维码的文字、网址等
     * @param mBitmap logo文件
     * @return bitmap
     */
    public static Bitmap createQRCodeWithLogo(String text, Bitmap mBitmap) {
        return createQRCodeWithLogo(text, 500, mBitmap);
    }
 
    /**
     * 生成带logo的二维码,logo默认为二维码的1/5
     *
     * @param text    需要生成二维码的文字、网址等
     * @param size    需要生成二维码的大小()
     * @param mBitmap logo文件
     * @return bitmap
     */
    public static Bitmap createQRCodeWithLogo(String text, int size, Bitmap mBitmap) {
        try {
            IMAGE_HALFWIDTH = size / 10;
            Hashtable hints = new Hashtable<>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            /*
             * 设置容错级别,默认为ErrorCorrectionLevel.L
             * 因为中间加入logo所以建议你把容错级别调至H,否则可能会出现识别不了
             */
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //设置空白边距的宽度
            hints.put(EncodeHintType.MARGIN, 1); //default is 4
            // 图像数据转换,使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(text,
                    BarcodeFormat.QR_CODE, size, size, hints);
 
            int width = bitMatrix.getWidth();//矩阵高度
            int height = bitMatrix.getHeight();//矩阵宽度
            int halfW = width / 2;
            int halfH = height / 2;
 
            Matrix m = new Matrix();
            float sx = (float) 2 * IMAGE_HALFWIDTH / mBitmap.getWidth();
            float sy = (float) 2 * IMAGE_HALFWIDTH
                    / mBitmap.getHeight();
            m.setScale(sx, sy);
            //设置缩放信息
            //将logo图片按martix设置的信息缩放
            mBitmap = Bitmap.createBitmap(mBitmap, 0, 0,
                    mBitmap.getWidth(), mBitmap.getHeight(), m, false);
 
            int[] pixels = new int[size * size];
            for (int y = 0; y < size; y++) {
                for (int x = 0; x < size; x++) {
                    if (x > halfW - IMAGE_HALFWIDTH && x < halfW + IMAGE_HALFWIDTH
                            && y > halfH - IMAGE_HALFWIDTH
                            && y < halfH + IMAGE_HALFWIDTH) {
                        //该位置用于存放图片信息
                        //记录图片每个像素信息
                        pixels[y * width + x] = mBitmap.getPixel(x - halfW
                                + IMAGE_HALFWIDTH, y - halfH + IMAGE_HALFWIDTH);
                    } else {
                        if (bitMatrix.get(x, y)) {
                            pixels[y * size + x] = 0xff000000;
                        } else {
                            pixels[y * size + x] = 0xffffffff;
                        }
                    }
                }
            }
            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;
        }
    }
 
 
    /**
     * 生成二维码Bitmap  此方法与上面的createQRCodeWithLogo方法效果一样(设置Bitmap两种写方法)
     *
     * @param context
     * @param data     文本内容
     * @param logoBm   二维码中心的Logo图标(可以为null)
     * @return 合成后的bitmap
     */
    public static Bitmap createQRImage(Context context, String data, Bitmap logoBm) {
        try {
            if (data == null || "".equals(data)) {
                return null;
            }
            int widthPix = ((Activity) context).getWindowManager().getDefaultDisplay()
                    .getWidth();
            widthPix = widthPix / 5 * 3;
            int heightPix = widthPix;
 
            //配置参数
            Map hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            //容错级别
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //设置空白边距的宽度
            hints.put(EncodeHintType.MARGIN, 1); //default is 4
 
            // 图像数据转换,使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(data, 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;
            //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 != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    /**
     * 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.restore();
        } catch (Exception e) {
            bitmap = null;
            e.getStackTrace();
        }
 
        return bitmap;
    }
}

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