android studio直接运行main方法提示SourceSet with name 'main' not found错误的解决方法
在.idea目录下的gradle.xml文件里，<GradleProjectSettings>节点下添加<option name="delegatedBuild" value="false"/>即可
<GradleProjectSettings>
<option name="delegatedBuild" value="false"/> //新增这行即可
<option name="testRunner" value="GRADLE" />
...
</GradleProjectSettings>
