如何在带有提供程序的ListView中返回Future <double>？

如何解决如何在带有提供程序的ListView中返回Future <double>？

我正在尝试使用Provider程序包将Future引入到列表视图中，但未成功。谁能给我一些建议或链接，以解释如何在返回双精度值的Future上实现notifylisteners（）？

getPrice（）的未来在这里：

beforeEach(async(() => {
    Testbed.configureTestingModule({
      imports: [RouterTestingModule,MatDialog,browserModule],declarations: [ DossierPersonalDataComponent ],providers: [{

        provide: DomSanitizer,useValue: {
          sanitize: () =>'safeString',bypassSecurityTrustHtml: () => 'safeString'
        }

      },DossierFileService,ErrorProcessor,]
    })
    .compileComponents();
  }));

在这里，我试图将getPrice（）的值输入到文本小部件中，但是却给了我“ Future的实例”而不是值。

I cannot embed pictures yet

import 'dart:collection';
import 'package:http/http.dart' as http;
import 'package:Flutter/material.dart';
import 'package:stock_watchlist/stock_service.dart';

class StockData extends ChangeNotifier {
  List<Stock> _stocks = [
    Stock(symbol: 'AAPL'),Stock(symbol: 'AMD'),Stock(symbol: 'TSLA')
  ];

  UnmodifiableListView<Stock> get stocks {
    return UnmodifiableListView(_stocks);
  }

  int get stockCount {
    return _stocks.length;
  }

  void addStock(String symbol,double price,double eps) {
    final stock = Stock(symbol: symbol);
    _stocks.add(stock);
    notifyListeners();
  }

  void deleteStock(Stock stock) {
    _stocks.remove(stock);
    notifyListeners();
  }

  Future<double> getPrice(String symbol) async {
    String url =
        "https://sandBox.iexapis.com/stable/stock/$symbol/quote/latestPrice?token=Tsk_38ddda0b877a4510b42a37ae713cdc96";

    http.Response response = await http.get(url);
    double price = double.tryParse(response.body);
    return price;
  }

  Future<double> getEps(String symbol) async {
    String url =
        "https://sandBox.iexapis.com/stable/stock/$symbol/stats/ttmEPS?token=Tsk_38ddda0b877a4510b42a37ae713cdc96";

    http.Response response = await http.get(url);
    double eps = double.tryParse(response.body);
    return eps;
  }
}

解决方法

谢谢，我想我已经用FutureBuilder弄清楚了。这是我使用的代码。

class StockList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Consumer<StockData>(
      builder: (context,stockData,child) {
        return ListView.builder(
          itemCount: stockData.stockCount,itemBuilder: (context,index) {
            //
            final stockIndex = stockData.stocks[index];
            //
            return ListTile(
              title: Text(
                stockIndex.symbol,style: TextStyle(
                  color: kTextColor,),subtitle: FutureBuilder(
                future: stockData.getPrice(stockIndex.symbol),builder: (context,snapshot) => Text(
                  snapshot.data.toString(),style: TextStyle(
                    color: kTextColor,);
          },);
      },);
  }
}