MultiFormatWriter writer = new MultiFormatWriter();
            Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hint.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
            BarcodeWriter barcodeWriter 
 
= new BarcodeWriter();
            var bm = writer.encode("123123123", BarcodeFormat.QR_CODE, 700, 700, hint);
            var bmp = barcodeWriter.Write(bm);
            //獲取二維碼實際尺寸（去掉二維碼兩邊空白後的實際尺寸）
            int[] rectangle = bm.getEnclosingRectangle();

            Bitmap logo = BitmapFactory.DecodeResource(this
 
.Resources, Resource.Mipmap.timg);
            //計算插入圖片的大小和位置

            int width = Math.Min((int)(rectangle[2] / 3.5), logo.Width);
            int height = Math.Min((int)(rectangle[3] / 3.5), logo.Height);
            int left = (bmp.Width - width) / 2;
            int top = (bmp.Height - height) / 2
 
;
            int right = left + width;
            int bottom = top + height;
            //將img轉換成bmp格式，否則後面無法建立Graphics物件 
            using (Android.Graphics.Canvas g = new Canvas(bmp))
            {
                //先填充個白色背景
              //  g.DrawRect(new Rect(left-1, top-1, right+1, bottom+1), new Paint() { Color = Color.White });
                g.DrawBitmap(logo, new Rect(0, 0, logo.Width, logo.Height), new Rect(left, top, right, bottom), new Paint());
            } 
            ImageView view = new ImageView(this);
            view.SetImageBitmap(bmp);
            this.AddContentView(view, new Android.Views.ViewGroup.LayoutParams(700, 700));