build.gradle

buildscript {
    ext.kotlin_version = '1.2.30'

    repositories {
        jcenter()
        google()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath 'com.google.gms:google-services:4.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven {
            url 'https://oss.sonatype.org/content/repositories/snapshots/'
        }
    }
}

project.ext.preDexLibs = !project.hasProperty('disablePreDex')

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