android 使用zxing生成中间嵌套logo的二维码

效果图：
zxing请自行下载
代码：
/**     * 生成二维码Bitmap     *     * @param content   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<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();             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, 3); //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.ALL_SAVE_FLAG);             canvas.restore();         } catch (Exception e) {             bitmap = null;             e.getStackTrace();         }            return bitmap;     }
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