Android Studio throws build error in Kotlin project which calls static method in java interface

问题

I have a Kotlin project in Android Studio. I am calling a static method in Java interface from the Kotlin code. The build fails with the error,

Calls to static methods in Java interfaces are prohibited in JVM target 1.6. Recompile with '-jvm-target 1.8'

I have the following in my build.gradle,

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

I have also changed the Target JVM version to 1.8 in Kotlin compiler settings. Still, the build throws the error. Also tried Invalidating cache and restarting.

Android Studio version: 3.0.1

回答1:

Proper way to set Kotlin compile options in android gradle. Make these changes to your app level Build.gradle

Change

implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

implementation "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"

Then write this task

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8

    kotlinOptions {
        jvmTarget = '1.8'
        apiVersion = '1.1'
        languageVersion = '1.1'
    }
}

just below(not necessarily)

repositories {
    mavenCentral()
}

For details, refer here

回答2:

The compileOptions section in build.gradle affects the Java compiler, not the Kotlin compiler. To set the target JVM version for the Kotlin compiler, use the following block:

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

See the documentation for more information.

回答3:

I had the same problem because I had a folder for the integration tests different than the unit test folder. So the build.gradle needs more configuration:

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
} 
//added this
compileIntegrationTestKotlin {
  kotlinOptions.jvmTarget = "1.8"
}

来源：https://stackoverflow.com/questions/48953039/android-studio-throws-build-error-in-kotlin-project-which-calls-static-method-in

标签

android

android-studio

kotlin