flutter Android配置时出现下面问题，死活解决不了，请大佬帮忙。。。。。

Question

• Error running Gradle: ProcessException: Process "C:\Users\Downloads\fluttermusic\android\gradlew.bat" exited abnormally:

Configure project :app
IOException: https://dl.google.com/android/repository/addons_list-3.xml
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required"
IOException: https://dl.google.com/android/repository/addons_list-2.xml
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required"
IOException: https://dl.google.com/android/repository/addons_list-1.xml
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required"
Failed to download any source lists!
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required"

FAILURE: Build failed with an exception.

• Where:
  Build file 'C:\Users\F2846804\Downloads\fluttermusic\android\build.gradle' line: 32

• What went wrong:
  A problem occurred evaluating root project 'android'.

  A problem occurred configuring project ':app'.
  Failed to find Build Tools revision 28.0.3

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 1s
Command: C:\Users\Downloads\fluttermusic\android\gradlew.bat app:properties

Finished with error: Please review your Gradle project setup in the android/ folder.

Answer 1

您可以尝试清除代理设置，找到如下文件（您电脑里的用户名可能不同）：

C:\Users\Administrator\.gradle\gradle.properties

右键点击，选择一个文本编辑器打开它，找到跟代理设置相关的行，注释或者删除。