flutter遇到的问题归纳

版本升级篇：

问题一：

Failed to retrieve the Dart SDK from: https://storage.Flutter-io.cnexport/Flutter_infra/Flutter/2f0af3715217a0c2ada72c717d4ed9178d68f6ed/dart-sdk-darwin-x64.zip
If you're located in China, please see this page:
  https://Flutter.dev/community/china

解决办法：

先执行命令

export PUB_HOSTED_URL=https://pub.Flutter-io.cn

export FlutteR_STORAGE_BASE_URL=https://storage.Flutter-io.cn

完成后，再执行命令

Flutter doctor

问题二：

运行时出现：

Exception: Gradle task assembleDebug Failed with exit code 1

解决办法：

在android工程的build.gradle，如下图

加入 

maven { url 'http://download.Flutter.io' }

如下图