在studio中想要测试某个功能直接执行main()方法报错如下：

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* What went wrong:

A problem occurred configuring project ':app'.

> Could not create task ':app: **** .main()'.

  > SourceSet with name 'main' not found.

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解决方案：

1. 执行run ** main() with Coverage;

2. 修改.idea下的gradle.xml

<GradleProjectSettings>标签节点下添加一行

<option name="delegatedBuild" value="false" />

保存，即可使用run ** with main() 和 debug ** with main() 

gradle.xml

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错误：  Command line is too long. Shorten command line for  **

有人在上面盖了gradle.xml之后运行main方法又报如下错误：
Error running ' ** ': Command line is too long. Shorten command line for  **  or also for Application default configuration.

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解决方案：

 修改.idea下的workspace.xml

找到<component name="PropertiesComponent">标签节点并在之下添加一行

<property name="dynamic.classpath" value="true" />

然后保存即可。

workspace.xml

正常运行 main()

main()