我正在嘗試在我的 flutter 應(yīng)用程序中使用 json 從服務(wù)器獲取一些數(shù)據(jù)。這是我正在使用的功能。List<String> userFriendList = ["No Friends"];  Future<http.Response> _fetchSampleData() {            return http.get('//link/to/server/fetcher/test_fetcher.php');}Future<void> getDataFromServer() async {            final response = await _fetchSampleData();            if (response.statusCode == 200) {              Map<String, dynamic> data = json.decode(response.body);                    userLvl = data["lvl"].toString();                userName = data["name"];                userFriendList = List();                userFriendList = data["friendlist"];              } else {              // If the server did not return a 200 OK response,              // then throw an exception.              print('Failed to load data from server');            }}我明白u(yù)srLvl了userName。但是對(duì)于userFriendList，我收到以下錯(cuò)誤：[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'List<String>'服務(wù)器端代碼（test_fetcher.php）：<?php    $myObj->name = "JohnDoe";    $myObj->lvl = 24;    $friends = array("KumarVishant", "DadaMuni", "BabuBhatt", "BesuraGayak", "BabluKaneria", "MorrisAbhishek", "GoodLuckBaba", "ViratKohli", "LeanderPaes");    $myObj->friendlist = $friends;    header('Content-Type: application/json');    $myJSON = json_encode($myObj);    echo $myJSON;?>