import java.util.List;
import java.util.ArrayList;
import java.util.Set;
compileKotlin {
kotlinOptions {
languageVersion = "1.1"
apiVersion = "1.1"
}
}
import java.util.ArrayList
import java.util.HashSet
以上方法,可以解决Android Studio Unresolved Reference: List, arrayListOf, setOf错误。