Android生成二维码

public void createQRcodeImage(String url)
    {
        im1=(ImageView)findViewById(R.id.imageView);
        w=im1.getWidth();
        h=im1.getHeight();
        try
        {
            //判断URL合法性
            if (url == null || "".equals(url) || url.length() < 1)
            {
                return;
            }
            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
            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(url, BarcodeFormat.QR_CODE, w, h, hints);
            int[] pixels = new int[w * h];
            //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 < h; y++)
            {
                for (int x = 0; x < w; x++)
                {
                    if (bitMatrix.get(x, y))
                    {
                        pixels[y * w + x] = 0xff000000;
                    }
                    else
                    {
                        pixels[y * w + x] = 0xffffffff;
                    }
                }
            }
            //生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, w, 0, 0, w, h);
            //显示到我们的ImageView上面
            im1.setImageBitmap(bitmap);
        }
        catch (WriterException e)
        {
            e.printStackTrace();
        }

依赖包加入：compile 'com.google.zxing:core:3.3.0'

https://blog.csdn.net/mountain_hua/article/details/80646089