Response.body 是空的颤振

Question

我正在尝试使用以下请求从 https://fantasy.premierleague.com/api/bootstrap-static/ 检索数据，但我得到了一个空正文 任何想法如何从这种类型的 API 中检索数据。谢谢 完整代码是

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

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  Future<String> getData() async {
    http.Response response = await http.get(
      "https://fantasy.premierleague.com/api/bootstrap-static/",
    );
    var data = response.body;
    print(data);
    return response.body;
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          getData();
        },
      ),
      body: Center(
        child: Text("Hello World"),
      ),
    
    );
  }    
}

问题解决了！！！ 在我做了一个颤振升级后一切正常，我仍然不知道这是怎么回事

升级前的 Flutter Doctor

Doctor summary (to see all details, run flutter doctor -v):                                                                  
[√] Flutter (Channel master, 1.21.0-10.0.pre.111, on Microsoft Windows 
[Version 10.0.18363.1082], locale en-US)                                                                                                                                 
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)                                            ! Some Android licenses not 
accepted.  To resolve this, run: flutter doctor --android-licenses                      
[√] Android Studio (version 3.6)

[√] VS Code (version 1.50.0)
[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

Flutter Doctor afterUpgrade

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel master, 1.23.0-8.0.pre.284, on Microsoft Windows [Version 10.0.18363.1082], locale en-US)

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Android Studio (version 3.6)
[√] VS Code (version 1.50.0)
[√] Connected device (1 available)

! Doctor found issues in 1 category.

Answer 1

你可以试试这个吗？

  Future<String> getData() async {
   http.Response response = await http.get("https://fantasy.premierleague.com/api/bootstrap-static/");
var data = response.body;
   print(data );
   return response.body;
  }

上面的东西肯定有效。我对其进行了测试并附上了屏幕截图。

如果你想通过另一个变量获取返回值，例如这样：

String data = getData();

你需要像这样倾听未来是行不通的：

String data = getData().then((value) => value);

P.S:这个答案不值得-1。