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效果图：

实现代码：

//二维码扫一扫
Future _scanQR() async {
  try {
    final result = await BarcodeScanner.scan(
      options: ScanOptions(
        strings: {
          'cancel': _cancelController.text,
          'flash_on': _flashOnController.text,
          'flash_off': _flashOffController.text,
        },
        restrictFormat: selectedFormats,
        useCamera: _selectedCamera,
        autoEnableFlash: _autoEnableFlash,
        android: AndroidOptions(
          aspectTolerance: _aspectTolerance,
          useAutoFocus: _useAutoFocus,
        ),
      ),
    );
    _processQRResult(result);
  } on PlatformException catch (e) {
    String errorResult = e.code == BarcodeScanner.cameraAccessDenied ? '没有拍照权限!': 'Unknown error: $e';
    LogUtils.d("扫一扫返回异常：${errorResult}");
  }
}

//处理扫描结果
void _processQRResult(ScanResult result){
  if(result == null){
    return;
  }

  if (result.rawContent.startsWith(CommonUtils.QR_PAYMENT_CODE)){
    //向商家付款
    String toUser = result.rawContent.substring(CommonUtils.QR_PAYMENT_CODE.length, result.rawContent.length);
    Navigator.push(context, MaterialPageRoute(builder: (context) => MerchantPayment(toUser: toUser)));

  } else if(result.rawContent.startsWith(CommonUtils.QR_RECEIVE_CODE)){
    //二维码收款
    String receiveResult  = result.rawContent.substring(CommonUtils.QR_PAYMENT_CODE.length, result.rawContent.length);
    String balance = receiveResult.split(":")[0];
    String toUser = receiveResult.split(":")[1];
    LogUtils.d("扫一扫返回结果 ${receiveResult} ,  ${balance} ,  ${toUser}");
    Navigator.push(context, MaterialPageRoute(builder: (context) => PersonalPayment(toUser: toUser, balance: double.parse(balance),)));
  } else if(result != null){
    //添加好友
    String content = result.rawContent;
    List<String> contentList = content.split(CommonUtils.CHAT_MESSAGE_SPILE);
    String accountStr = contentList[0];
    String nickName = contentList[1];
    String avatar = contentList[2];
    String accountResult = accountStr.substring(CommonUtils.QR_ADD_FRIEND.length, accountStr.length);
    UserBean userBean = UserBean(account: accountResult, avatar: avatar, nickName: nickName);
    LogUtils.d("扫一扫返回结果：${accountStr} ， ${nickName} , ${avatar}, ${accountResult}");
    _goSearchFriends(accountResult, userBean);
  }
}