生成二维码以及生成带头像标示的二维码

/**
 * 用字符串生成二维码
 *
 * @param text
 * @return
 * @throws WriterException
 */
public static Bitmap create2DCode(String text) {
    //生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
    Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    hints.put(EncodeHintType.MARGIN, 0);
    BitMatrix matrix = null;
    try {
        matrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, 400, 400, hints);
    } catch (WriterException e) {
        e.printStackTrace();
    }
    int width = matrix.getWidth();
    int height = matrix.getHeight();
    //二维矩阵转为一维像素数组,也就是一直横着排了
    int[] pixels = new int[width * height];
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            if (matrix.get(x, y)) {
                pixels[y * width + x] = 0xff000000;
            } else {
                pixels[y * width + x] = 0xffffffff;
            }
        }
    }
    Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    //通过像素数组生成bitmap,具体参考api
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;

}

/**
     * 生成带图片的二维码
     *
     * @param qr
     * @param rid
     */
    public static void createQRCodeBitmapWithPortrait(Bitmap qr, int rid, int width) {
        Bitmap portrait = BitmapFactory.decodeResource(MyApp.getInstance().getResources(), rid);
        // 头像图片的大小
        int strokeWidth = 8;//边框宽度
        int portrait_W = portrait.getWidth();
        int portrait_H = portrait.getHeight();
        if (portrait_W > width) {
            double param = ((double) portrait_W) / ((double) width);
            portrait_H = ((int) (((double) portrait_H) / param));
            portrait_W = width;
            portrait = Bitmap.createScaledBitmap(portrait, portrait_W, portrait_H, true);
        }

        // 设置头像要显示的位置，即居中显示
        int left = (qr.getWidth() - portrait_W) / 2;
        int top = (qr.getHeight() - portrait_H) / 2;
        int right = left + portrait_W;
        int bottom = top + portrait_H;
        Rect rect1 = new Rect(left, top, right, bottom);

        // 取得qr二维码图片上的画笔，即要在二维码图片上绘制我们的头像
        Canvas canvas = new Canvas(qr);

        // 设置我们要绘制的范围大小，也就是头像的大小范围
        Rect rect2 = new Rect(0, 0, portrait_W, portrait_H);
        Paint paint = new Paint();
        paint.setColor(MyApp.getInstance().getResources().getColor(R.color.main_blue));
        paint.setStrokeWidth(strokeWidth);
        Rect side = new Rect(left, top, right, bottom);
        // 开始绘制
        canvas.drawBitmap(portrait, rect2, rect1, null);
    }

使用方法：

Bitmap bmp = Tools.create2DCode("生成二维码的内容");
Tools.createQRCodeBitmapWithPortrait(bmp, R.mipmap.logo, bmp.getWidth() / 6);
iv_two_pic.setImageBitmap(bmp);

结果查看：