问题：

有时在开发中想直接写一个java文件来测试一些东西，但是AndroidStudio执行的时候会报错。

代码信息：

public class HelloWorld {

public static void main(String[] args) {

System.out.println("HelloWorld");

}

}

报错信息

12:04:41: Executing task 'HelloWorld.main()'...

Executing tasks: [HelloWorld.main()] in project D:\AndroidStudioProjects\MyApplication8

> Configure project :app

WARNING: The following project options are deprecated and have been removed:

android.enableAapt2

This property has no effect, AAPT2 is now always used.

FAILURE: Build failed with an exception.

* Where:

Initialization script 'C:\Users\cj\AppData\Local\Temp\HelloWorld_main__.gradle' line: 20

* What went wrong:

A problem occurred configuring project ':app'.

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

> SourceSet with name 'main' not found.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.

Use '--warning-mode all' to show the individual deprecation warnings.

See https://docs.gradle.org/5.6.4/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 116ms

12:04:41: Task execution finished 'HelloWorld.main()'.

解决方案

在.idea文件夹中找到gradle.xml， 打开文件，在标签下添加

添加后文件内容

结果

image.png

总结

再次运行就可以显示执行结果了，据说这句话的意思是不让gradle接管构建任务，防止当作gradle的task来执行。