Flutter 卡在 "Running Gradle task 'assembleDebug'... "

如何解决，网上大多数都提到更换maven源。

而有时实际情况是即使你换了，还是一个niaoyang。

windows 处理方法如下:

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1.  Open your flutter Project directory.
2.  Change directory to android directory in your flutter project directory `cd android`
3.  clean gradle `./gradlew.bat clean`
4.  Build gradle `./gradlew.bat build` or you can combine both commands with just `./gradlew.bat clean build` (Thanks @daniel for the tip)
5.  Now run your flutter project. If you use vscode, press F5. First time gradle running assembleDebug will take time.

执行gradlew clean后，会有下载jar的日志输出（下载了多少/jar多大）直观明了。