Android Studio 执行java.main报错解决

Android Studio 执行java.main报错:

解决：
修改项目文件 ..\.idea\gradle.xml，GradleProjectSettings标签下新增一行 <option name="delegatedBuild" value="false" />，即不通过gradle委托来build。
完整的 ..\.idea\gradle.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
  <component name="GradleSettings">
    <option name="linkedExternalProjectsSettings">
      <GradleProjectSettings>
        <option name="delegatedBuild" value="false" />
        <option name="testRunner" value="PLATFORM" />
        <option name="distributionType" value="DEFAULT_WRAPPED" />
        <option name="externalProjectPath" value="$PROJECT_DIR$" />
        <option name="gradleHome" value="/Applications/study/gradle/gradle-6.2.2" />
        <option name="modules">
          <set>
            <option value="$PROJECT_DIR$" />
            <option value="$PROJECT_DIR$/app" />
          </set>
        </option>
        <option name="resolveModulePerSourceSet" value="false" />
      </GradleProjectSettings>
    </option>
  </component>
</project>