颤振Dart：URI的目标不存在 [英] Flutter | Dart : Target of URI does not exist

问题描述

我正在制作我的第一个应用程序，以使用Flutter构建Android应用程序。
我正在使用Android Studio作为IDE。
问题是当我导入http软件包时：

I am making my first Application to build an Android App with Flutter. I am using Android Studio as IDE. The problem is when I import the http package:

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

我遇到错误：

错误：URI的目标不存在：'package：http / http.dart'。
（uri_does_not_exist at [flutter_crypto] lib\home_page.dart：3）

error: Target of URI doesn't exist: 'package:http/http.dart'. (uri_does_not_exist at [flutter_crypto] lib\home_page.dart:3)

这是我的代码：

  Future<List> getCurrencies() async{
    String cryptoUrl = "https://api.coinmarketcap.com/v1/ticker/?limit=50";
    http.Response response = await http.get(cryptoUrl);
    return JSON.decode(response.body);
  } 

谢谢，

推荐答案

您需要按如下所示将HTTP依赖项添加到pubspec.yaml中。

You need to add the HTTP dependency to pubspec.yaml as per below.

 dependencies:
      flutter:
        sdk: flutter

      # The following adds the Cupertino Icons font to your application.
      # Use with the CupertinoIcons class for iOS style icons.
      cupertino_icons: ^0.1.2
      http: ^0.12.0

添加依赖项之后，您需要运行以下命令来更新/安装所需的软件包：

With the dependency added you then need to run the following command to update/install required packages:

flutter packages upgrade

希望这会有所帮助

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