Flutter 异步函数wait不工作，在wait完成之前执行return_Flutter

Flutter 异步函数wait不工作，在wait完成之前执行return

flutter

Flutter 异步函数wait不工作，在wait完成之前执行return,flutter,Flutter,我希望返回等待响应，但它不响应，并且返回“Future”print实例等待响应，但返回不响应。如何解决此问题您可以复制粘贴运行下面的完整代码调用此函数时需要使用wait getAPI 代码片段 void _incrementCounter() async{ var data = await getAPI("test","test"); print('data ${data}'); 输出 I/flutter (28471): response.data <!doct

我希望返回等待响应，但它不响应，并且返回“Future”print实例等待响应，但返回不响应。如何解决此问题

您可以复制粘贴运行下面的完整代码调用此函数时需要使用wait getAPI

代码片段

void _incrementCounter() async{
    var data = await getAPI("test","test");
    print('data  ${data}');

输出

I/flutter (28471): response.data  <!doctype html><html itemscope="" ...
I/flutter (28471): data  <!doctype html><html itemscope="" ...

完整代码

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  Future getAPI(String url, var body) async {
    Response response;
    Dio dio = new Dio();
    //response = await dio.get(baseURL + url, queryParameters: body);
    response = await Dio().get("http://www.google.com");
    print('response.data  ${response.data}');
    return response.data;
  }

  void _incrementCounter() async{
    var data = await getAPI("test","test");
    print('data  ${data}');
    setState(() {

      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

您可以使用FutureBuilder并将getAPI作为future传递。或者在调用getAPI时使用wait。response.data.toString如何？也试着将未来改变为Future@P4yamresponse.data.toString将返回“Future”的实例，每次调用getAPI时，他都需要使用FutureBuilder或使用Wait。

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  Future getAPI(String url, var body) async {
    Response response;
    Dio dio = new Dio();
    //response = await dio.get(baseURL + url, queryParameters: body);
    response = await Dio().get("http://www.google.com");
    print('response.data  ${response.data}');
    return response.data;
  }

  void _incrementCounter() async{
    var data = await getAPI("test","test");
    print('data  ${data}');
    setState(() {

      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}