FVM安装Flutter SDK时出现FormatException错误的解决咨询

问题描述 #

执行命令 fvm install stable 安装Flutter稳定版SDK时，触发以下异常：

Creating local mirror... Unhandled exception: FormatException: Invalid UTF-8 byte (at offset 5) #0      _Utf8Decoder.convertChunked (dart:convert-patch/convert_patch.dart:1851) #1      _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:304) #2      _Utf8ConversionSink.add (dart:convert/string_conversion.dart:300) #3      _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:69) #4      _SinkTransformerStreamSubscription._handleData          ] #5      _rootRunUnary (dart:async/zone.dart:1407) #6      _CustomZone.runUnary (dart:async/zone.dart:1308) #7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:1217) #8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339) #9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271) #10     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:784) #11     _StreamController._add (dart:async/stream_controller.dart:658) #12     _StreamController.add (dart:async/stream_controller.dart:606) #13     _Socket._onData (dart:io-patch/socket_patch.dart:2447) #14     _rootRunUnary (dart:async/zone.dart:1415) #15     _CustomZone.runUnary (dart:async/zone.dart:1308) #16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1217) #17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:339) #18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271) #19     _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:784) #20     _StreamController._add (dart:async/stream_controller.dart:658) #21     _StreamController.add (dart:async/stream_controller.dart:606) #22     new _RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1936) #23     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1379) #24     _microtaskLoop (dart:async/schedule_microtask.dart:40) #25     _startMicrotaskLoop (dart:async/schedule_microtask.dart:49) #26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:123) #27     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:190)

已尝试重置系统、以管理员权限运行CMD和PowerShell，问题仍未解决。

修复方案 #

• 切换稳定网络环境：该异常多因网络请求返回的内容编码不符合UTF-8标准导致，切换到稳定的境外网络或使用代理工具，确保连接Flutter官方资源的链路正常。
• 使用具体版本号安装：放弃stable别名，直接指定具体稳定版版本号执行命令，例如：

  fvm install 3.13.9
  

• 清理FVM缓存后重试：删除FVM默认缓存目录C:\Users\<你的用户名>\fvm，之后重新执行安装命令。
• 手动下载SDK导入FVM：
  1. 下载对应稳定版的Flutter SDK压缩包
  2. 将压缩包解压到C:\Users\<你的用户名>\fvm\versions\stable目录
  3. 执行命令 fvm use stable 完成配置

内容的提问来源于stack exchange，提问作者이지민