我无法向SAP服务层发出请求

Question

我想制作一个通过SAP服务层搜索扫描项目的qr扫描仪，我设法使qr扫描仪正常工作，但是我无法建立与服务层的连接，我尝试使用http，请求和现在的sap库，我不是很擅长编码，这是我第一次使用flutter，另外一个问题是我无法实时调试，因为我正在通过远程桌面在mi home pc上进行编码，并且我将apk构建为测试我在哪里，

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/services.dart';
import 'package:b1serviceflayer/b1serviceflayer.dart';
import 'dart:convert';

import 'items.dart';

void main() => runApp(MaterialApp(
  debugShowCheckedModeBanner: false,
  home: HomePage(),
));

class HomePage extends StatefulWidget {
  

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  String result = "Hola!";
  var itemid = '0';

  Future _scanQR() async{
    try{
      var qrResult = await BarcodeScanner.scan();
      setState(() {
        result = qrResult.rawContent;
        itemid = qrResult.rawContent;
        Navigator.push(context, MaterialPageRoute(builder: (context) => Items(result)));
      });

    }
    on PlatformException catch (ex) {
      if(ex.code == BarcodeScanner.cameraAccessDenied){
        setState(() {
          result = "Permisos de Camara denegados";
        });
      }
      else{
        setState(() {
          result = "Error Desconocido $ex";
        });
      } 
    }
    on FormatException{
      setState(() {
        result = "volviste antes de escanear";
      });
    }
    catch (ex){
      setState(() {
        result = "Error Desconocido $ex";
      });
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("EScaner"),
      ),
      body: Center(
        child: Text(result, style: new TextStyle(fontSize: 30.0,fontWeight: FontWeight.bold),),
      ),
      floatingActionButton: FloatingActionButton.extended(
        icon: Icon(Icons.camera_alt),
        label: Text("Escanear"),
        onPressed: _scanQR,
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
    );
  }
}



class Items extends StatefulWidget {
  final String result;//if you have multiple values add here
  Items(this.result, {Key key}): super(key: key);

  @override
  _ItemsState createState() => _ItemsState();
}

class _ItemsState extends State<Items> {
  var resultado;


  Future getData() async {
  const url = "http://192.168.0.7:50001/b1s/v1/";
  const user = "test";
  const pwd ="test";
  const companyDB ="TEST";
  final b1s = B1ServiceLayer(B1Connection(serverUrl: url, 
  companyDB: companyDB, userName: user, password: pwd)); 
  await b1s.loginAsync().timeout(const Duration(seconds: 10));
  String itemsJson = await b1s.queryAsync("Items");
  Map<String, dynamic> itemsMap = json.decode(itemsJson);
  final items = itemsFromMap(itemsJson);
  resultado = items;
  }

  @override
  void initState() { 
    getData();
    super.initState();
    
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.result),
      ),
      body: Center(
        child: Text(resultado),
      ),
    );
  }
}