我认为您想要的是：
import 'dart:async';import 'dart:convert';import 'package:flutter/material.dart';import 'package:http/http.dart' as http;import 'package:charts_flutter/flutter.dart' as charts;void main() => runApp(new MyApp());class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( home: new MyHomePage(), ); }}class MyHomePage extends StatefulWidget { @override _MyHomePageState createState() => new _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> { List data; Timer timer; makeRequest() async { var response = await http.get( 'http://localhost/werkzeug/public/api/data_tool1', headers: {'Accept': 'application/json'}, ); setState(() { data = json.depre(response.body); }); } @override void initState() { super.initState(); timer = new Timer.periodic(new Duration(seconds: 2), (t) => makeRequest()); } @override void dispose() { timer.cancel(); super.dispose(); } @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text('Tool Data'), ), body: data == null ? CircularProgressIndicator() : createChart(), ); } charts.Series<LiveWerkzeuge, String> createSeries(String id, int i) { return charts.Series<LiveWerkzeuge, String>( id: id, domainFn: (LiveWerkzeuge wear, _) => wear.wsp, measureFn: (LiveWerkzeuge wear, _) => wear.belastung, // data is a List<LiveWerkzeuge> - extract the information from data // could use i as index - there isn't enough information in the question // map from 'data' to the series // this is a guess data: [ LiveWerkzeuge('WSP1', data[i]['temp1']), LiveWerkzeuge('WSP2', data[i]['temp2']), LiveWerkzeuge('WSP3', data[i]['temp3']), LiveWerkzeuge('WSP4', data[i]['temp4']), LiveWerkzeuge('WSP5', data[i]['temp5']), LiveWerkzeuge('WSP6', data[i]['temp6']), LiveWerkzeuge('WSP7', data[i]['temp7']), LiveWerkzeuge('WSP8', data[i]['temp8']), ], ); } Widget createChart() { // data is a List of Maps // each map contains at least temp1 (tool 1) and temp2 (tool 2) // what are the groupings? List<charts.Series<LiveWerkzeuge, String>> seriesList = []; for (int i = 0; i < data.length; i++) { String id = 'WZG${i + 1}'; seriesList.add(createSeries(id, i)); } return new charts.BarChart( seriesList, barGroupingType: charts.BarGroupingType.grouped, ); }}class LiveWerkzeuge { final String wsp; final int belastung; LiveWerkzeuge(this.wsp, this.belastung);}
