flutter环境搭建及其遇到的坑_flutter could not download kotlin-reflect-1.9.20.j

总的来说需要的也就4样东西，找齐了配置一下就OK；

• Flutter SDK[https://flutter.io/docs/get-started/install/windows] （建议下载官网的，下载完直接能用）

• 下载Dart插件

• 下载Flutter插件

  • 配置环境变量

• 准备ide（Androidstudio或者IntelliJ IDEA）配置flutter的SDK即可

遇到的问题：

• 不能下载插件 问题

  File->Settings->Apparence & Behavior->System Settings->Updates->use secure connnection
  
  勾去掉
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• 文件加载失败，换阿里镜像

  * Error running Gradle:
  ProcessException: Process "E:\flutter\demo\flutter_app\android\gradlew.bat" exited abnormally:
  Starting a Gradle Daemon (subsequent builds will be faster)
  
  > Configure project :app
  
  Project evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.
  
  FAILURE: Build failed with an exception.
  
  * Where:
  Build file 'E:\flutter\demo\flutter_app\android\app\build.gradle' line: 26
  
  * What went wrong:
  A problem occurred evaluating project ':app'.
  > Could not resolve all artifacts for configuration 'classpath'.
     > Could not download kotlin-reflect.jar (org.jetbrains.kotlin:kotlin-reflect:1.2.0)
        > Could not get resource 'https://jcenter.bintray.com/org/jetbrains/kotlin/kotlin-reflect/1.2.0/kotlin-reflect-1.2.0.jar'.
           &g
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