common/v5/android/android_sdk/Demo/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    ext {
        kotlin_version = "1.3.72"
        appcompat = "1.2.0"
        dokka_version = '1.4.10.2'
    }
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.3"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version" //新添加的这一classpath

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenCentral()
        maven {
           // url 'https://s01.oss.sonatype.org/content/repositories/releases/'
            url 'https://s01.oss.sonatype.org/content/groups/staging/'
        }

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}