如何在flutter中调用接口

dependencies:
  http: ^0.13.3

import 'package:http/http.dart' as http;

class ApiService {
  static const String baseUrl = 'https://api.example.com';

  static Future<String> fetchData() async {
    final response = await http.get(Uri.parse('$baseUrl/data'));
    if (response.statusCode == 200) {
      return response.body;
    } else {
      throw Exception('Failed to fetch data');
    }
  }
}

import 'package:flutter/material.dart';
import 'api_service.dart';

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder<String>(
      future: ApiService.fetchData(),
      builder: (context, snapshot) {
        if (snapshot.hasData) {
          return Text(snapshot.data);
        } else if (snapshot.hasError) {
          return Text('Error: ${snapshot.error}');
        } else {
          return CircularProgressIndicator();
        }
      },
    );
  }
}