Uri'来自'dart：core' [重复]

Posted 2023-03-27

【中文标题】Uri\'来自\'dart：core\' [重复]

【英文标题】：Uri' is from 'dart:core' [duplicate]Uri'来自'dart：core' [重复]

【发布时间】：2021-08-24 13:42:47

【问题描述】：

bin/dart_application_1.dart:18:74：错误：不能将参数类型“字符串”分配给参数类型“Uri”。 - 'Uri' 来自 'dart:core'。等待 http.get("https://jsonplaceholder.typicode.com/users/$userId");

import 'dart:convert';

void main(List<String> arguments) 
  fetchUserId();


void fetchUserId() async 
  print('before');
  var result = await fetchUser(5);


// future
Future<Map<String, String>> fetchUser(int userId) async 
  // return Future.delayed(
  //     Duration(seconds: 5), () => 'id': userId.toString(), 'name': 'Max');
  var responce =
      await http.get('https://jsonplaceholder.typicode.com/users/$userId');
  var map = json.decode(responce.body) as Map;
  return 'id': map['id'].toString(), 'name': map['name'];

【参考方案1】：

import 'dart:convert';

void main(List<String> arguments) 
  fetchUserId();


void fetchUserId() async 
  print('before');
  var result = await fetchUser(5);


// future
Future<Map<String, String>> fetchUser(int userId) async 
  // return Future.delayed(
  //     Duration(seconds: 5), () => 'id': userId.toString(), 'name': 'Max');
  var responce =
      await http.get(Uri.parse('https://jsonplaceholder.typicode.com/users/$userId'));
  var map = json.decode(responce.body) as Map;
  return 'id': map['id'].toString(), 'name': map['name'];