Automatically sets JDK_1_8 in Android Studio java module

build.gradle

apply plugin: 'java'
apply plugin: 'idea'

tasks.withType(JavaCompile) {
    options.encoding = 'UTF-8'
}

configurations {
    // pending http://jira.codehaus.org/browse/GRADLE-471
    providedCompile { description = 'Jars not to be included in the generated POM' }
}

sourceSets {
    main {
        compileClasspath += [configurations.providedCompile]
        runtimeClasspath += [configurations.providedCompile]
    }
    test {
        compileClasspath += [configurations.providedCompile]
        runtimeClasspath += [configurations.providedCompile]
    }
}

// add to idea classpath
// extracted from http://gradle.1045684.n5.nabble.com/Idea-project-generation-and-provided-scope-td4684287.html
idea.module {
    scopes.PROVIDED.plus += [configurations.providedCompile]
    scopes.COMPILE.minus += [configurations.providedCompile]
    jdkName = '1.8'

    iml.withXml {

        def atts = it.asNode().component
                .find { it.@name == 'NewModuleRootManager' }
                .attributes()

        println atts

        atts.remove('LANGUAGE_LEVEL')
        atts.put('LANGUAGE_LEVEL', 'JDK_1_8')

        def newAtts = it.asNode().component
                .find { it.@name == 'NewModuleRootManager' }
                .attributes()

        println newAtts
    }
}

compileJava.dependsOn ideaModule


// add to javadoc and eclipse classpath
gradle.taskGraph.beforeTask { task ->
    if (task.name == 'javadoc')
        task.options.classpath = task.options.classpath + configurations.providedCompile.resolve()
    if (task.name == 'eclipseClasspath')
        task.plusConfigurations += configurations.providedCompile
}



dependencies {
 // your dependencies

}