build.gradle

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

buildscript {
    repositories {
        google()
        jcenter()
    }
    //noinspection GroovyAssignabilityCheck
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
    }
}

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

    project.plugins.whenPluginAdded { plugin ->
        if ("com.android.build.gradle.AppPlugin" == plugin.class.name) {
            project.android.dexOptions.preDexLibraries = rootProject.ext.preDexLibs
        } else if ("com.android.build.gradle.LibraryPlugin" == plugin.class.name) {
            project.android.dexOptions.preDexLibraries = rootProject.ext.preDexLibs
        }
    }
}

// http://www.gradle.org/docs/current/dsl/org.gradle.api.plugins.ExtraPropertiesExtension.html
project.ext {
    compileSdkVersion = 27
    buildToolsVersion = '27.0.0'

    // see http://tools.android.com/tech-docs/new-build-system/tips#TOC-Improving-Build-Server-performance.
    // CIサーバなどでは -PdisablePreDex をつける。 preDexが省略されてビルドが速くなる
    preDexLibs = !project.hasProperty('disablePreDex')

    supportPackageVersion = '27.0.0'
    playServicesVersion = '11.0.0'
    testingSupportPackageVersion = '0.5'
}

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

task wrapper(type: Wrapper) {
    gradleVersion = '4.3'
}