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C:\Users\Administrator>flutter doctorDoctor summary (to see all details, run flutter doctor -v):[√] Flutter (Channel stable, v1.7.8+hotfix.3, on Microsoft Windows [Version 10.0.17134.472], locale zh-CN)[!] Android toolchain - develop for Android devices (Android SDK version 21.1.2)**X Flutter requires Android SDK 28 and the Android BuildTools 28.0.3To update using sdkmanager, run:****"D:\dev\android\sdk\tools\bin\sdkmanager" "platforms;android-28" "build-tools;28.0.3"**or visit https://flutter.dev/setup/#android-setup for detailed instructions.X Android license status unknown.Try re-installing or updating your Android SDK Manager.See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.[√] Android Studio (version 3.2)[!] Connected device! No devices available

打开SDK Manager 更新一下 platforms;android-28" "build-tools;28.0.3 。更新完成，继续

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C:\Users\Administrator>flutter doctorDoctor summary (to see all details, run flutter doctor -v):[√] Flutter (Channel stable, v1.7.8+hotfix.3, on Microsoft Windows [Version 10.0.17134.472], locale zh-CN)[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)**X Android license status unknown.**Try re-installing or updating your Android SDK Manager.See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.[√] Android Studio (version 3.2)[!] Connected device! No devices available

百度找到答案，运行下面命令。

Users/Android/sdk/tools/bin/sdkmanager --update**

错误提示如下：

Warning: An error occurred during installation: Failed to move away or delete existing target file: D:\dev\android\sdk\tools

Move it away manually and try again… done

还是不行，答案在这里

https://www.jianshu.com/p/d2a0a1c39728

把sdk下面的tools文件夹，重命名一下tool或者随意，然后打开cmd，前往其目录下的bin\sdkmanager，不会去的请百度

执行–update，也就是你的X:\xxxxsdk\tool\bin\sdkmanager --update，执行

终于把tools目录搞定了。

再往下走

flutter doctor --android-licenses

一路 YES,

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Error running Gradle: ProcessException: Process "C:\Users\Downloads\fluttermusic\android\gradlew.bat" exited abnormally:Configure project :appIOException: https://dl.google.com/android/repository/addons_list-3.xmljava.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.xmljava.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.xmljava.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: 32What went wrong:A problem occurred evaluating root project 'android'.A problem occurred configuring project ':app'.Failed to find Build Tools revision 28.0.3Try: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.orgBUILD FAILED in 1sCommand: C:\Users\Downloads\fluttermusic\android\gradlew.bat app:propertiesFinished with error: Please review your Gradle project setup in the android/ folder.

解决方法：

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。