Flutter 添加插件(Packages)问题pubspec.yaml

在Flutter工程下添加二个packages:

english_words: ^3.1.0
shared_preferences: ^0.4.2

首页在“pubspec.yaml”文件下编写：

dev_dependencies:
  flutter_test:
    sdk: flutter

  english_words: ^3.1.0
  shared_preferences: ^0.4.2

然后点击“flutter packages get”时，可能会在terminal中运行长时间不出结果（Running "flutter packages get" in flutter _demo...）

然后在终端执行解释了，并遇到问题：

问题1：

chenyingyoudeMacBook-Pro:~ yingyou$ flutter packages get

Waiting for another flutter command to release the startup lock…

解决方法，如下： 
1、关掉Android Studio打开flutter的安装目录/bin/cache/ 
2、删除lockfile文件 
3、继续执行终端

问题2：

Error: No pubspec.yaml file found.

This command should be run from the root of your Flutter project.Do not run this command from the root of your git clone of Flutter.

Running "flutter packages get" in flutter_demo…

终端cd到flutter工程下执行“flutter packages get”即可！

可能是工具还没正式发布，还是在终端执行比较多信息提示！