在这段代码中没有任何错误，但没有什么被理解为是什么导致了两个滑块。看到在这个android模拟器工作两个旋转木马。请告诉我什么是这个代码中的问题。不明白现在要写什么，多久了这个stock overflow被告知，添加一些更多的细节，头脑被宠坏了，所以我写这个，对不起，不注意这个，注意问题。

import 'dart:convert';
import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

class Carousel extends StatefulWidget {
  @override
  _CarouselState createState() => _CarouselState();
}
class _CarouselState extends State<Carousel> {

  var api = Uri.parse('http://192.168.43.162/flutter/bannerApi.php');
  var response;
  var bannerApi;
  @override

  void initState() {
    super.initState();
// for loading
    fetchData();


  }
  fetchData() async {
    response = await http.get(api);
    print(response.body);
    bannerApi = jsonDecode(response.body);

    setState(() {});
  }
  @override
  Widget build(BuildContext context) {

    return Scaffold(
           body: Center(
          child: response != null
              ? Stack(

                  children: List.generate(
                  bannerApi.length,
                  (index) => CarouselSlider(
                    items: [

                      //1st Image of Slider
                      Container(
                        margin: EdgeInsets.all(6.0),
                        decoration: BoxDecoration(

                          borderRadius: BorderRadius.circular(8.0),
                          image: DecorationImage(
                            image: NetworkImage(bannerApi[index]['img']),
                            // image: AssetImage(assignmets[index]['img']),

                            fit: BoxFit.cover,
                          ),
                        ),
                      ),

                    ],
                    //Slider Container properties
                    options: CarouselOptions(
                      height: 180.0,

                      enlargeCenterPage: true,
                      autoPlay: true,
                      aspectRatio: 16 / 9,
                      autoPlayCurve: Curves.fastOutSlowIn,

                      enableInfiniteScroll: true,
                      autoPlayAnimationDuration: Duration(milliseconds: 800),
                      viewportFraction: 0.8,
                    ),

                  ),
                ))
              : CircularProgressIndicator(
                  backgroundColor: Colors.white,

                )),
    );
  }
}

这是一个api数据。

[{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"},{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"},{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"},{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"},{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"},{"img":"https:\/\/images.unsplash.com\/photo-1517245386807-bb43f82c33c4?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"}]