Flutter 问题集结

1、flutter doctor 下载Dart SDK失败

Checking Dart SDK version...
Downloading Dart SDK from Flutter engine e61bb9ac3a3fd789754e2e54220bcfc27076a857...
Start-BitsTransfer : 无法启动服务，原因可能是已被禁用或与其相关联的设备没有启动。 (异常来自 HRESULT:0x80070422)
所在位置 C:\Users\Administrator\flutter\bin\internal\update_dart_sdk.ps1:47 字符: 1
+ Start-BitsTransfer -Source $dartSdkUrl -Destination $dartSdkZip
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [Start-BitsTransfer]，COMException
    + FullyQualifiedErrorId : StartBitsTransferCOMException,Microsoft.BackgroundIntelligentTransfer.Management.NewBits
   TransferCommand

Error: Unable to update Dart SDK. Retrying..

解决
右键-->任务管理器--> 服务-->打开服务。

找到Block Level Backup Engine Service，右键属性，将启动状态改成手动，确定并重试。

2、Flutter 项目创建/升级失败

Got socket error trying to find package coverage at http://pub.dartlang.org
Error: Unable to pub upgrade flutter tool. Retrying in five seconds…

原因与解决，参阅 this wiki article

解决方法

添加两个用户变量

环境变量