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Source: wtanaka, StackOverflow

Question: How can we use a shared variables as depency versions across multiple modules?

Answer:

We define those values inside a ext block in the top level build.gradle so it can be used by every module. But those value won't be visible within the buildscript block in the top level build.gradle so we need to move it into that.

Top level build.gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    //moved inside buildscript
    ext {
        compileSdkVersion = 27
        minSdkVersion = 15
        targetSdkVersion = 22
        kotlin_version = '1.1.51'
        support_version = '27.0.0'
        anko_version = '0.10.2'
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

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

allprojects {
    repositories {
        google()
        jcenter()
    }
}

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

Module build.gradle:

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion rootProject.compileSdkVersion
    defaultConfig {
        applicationId "com.vxhviet.kotlinweather"
        minSdkVersion rootProject.minSdkVersion
        targetSdkVersion rootProject.targetSdkVersion
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$rootProject.kotlin_version"
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

    compile "com.android.support:appcompat-v7:$rootProject.support_version"
    compile "org.jetbrains.anko:anko-common:$rootProject.anko_version"
}