The "I just want everything to be Java 8" root build.gradle additions

java_8_everything_build.gradle

// Just add these to the root build.gradle of any project where 
// you just want everything to be Java 8 by default
subprojects {
    project.plugins.whenPluginAdded { plugin ->
        if ("com.android.build.gradle.AppPlugin" == plugin.class.name
                || "com.android.build.gradle.LibraryPlugin" == plugin.class.name) {
            project.android.compileOptions {
                sourceCompatibility JavaVersion.VERSION_1_8
                targetCompatibility JavaVersion.VERSION_1_8
            }
        }
    }
    
    tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
        kotlinOptions.jvmTarget = "1.8"
    }
    tasks.withType(JavaCompile) {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
}