Configuration note

Change java version

android{
...
	compileOptions {
    	sourceCompatibility JavaVersion.VERSION_11
    	targetCompatibility JavaVersion.VERSION_11
	}
	kotlinOptions {
    	jvmTarget = '11'
	}
}

// build.gradle(Module level). Direct change and sync pjt. It works.
/* Alternatives : Go File > Project Structure > Modules tap. And change Source compatibility/ Target compatibility.
*/

Change Gradle JDK

Move to ‘Settings > Build, Execution, Deployment > Build Tools > Gradle’ tap

And then change Gragle JDK to purpose version.

Kotlin JVM target

Go : file > settings > Other settings > Kotlin compiler.

Change Target JVM version.