for (int i = 0; i < height - 1; i += blockSize) {
            for (int j = 0; j < width - 1; j += blockSize) {
                //  Log.i(TAG, "imageToHtml: - "+i+"  "+j);
                int pixel = 0;
                //获取对应坐标的颜色信息
                pixel = bitmap.getPixel(j, i);
                int red = Color.red(pixel);
                int green = Color.green(pixel);
                int blue = Color.blue(pixel);
                int alpha = Color.alpha(pixel);
                htmlStr.append("<font style=color:rgba(" + red + "," + green + "," + blue + "," + alpha + ") >" + chars[n++ % content.length()] + "</font>");

            }
            htmlStr.append("<br>\n\n");
        }