build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        // Check that you have the following line (if not, add it):
        google()  // Google's Maven repository
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.3"
        // Add the following line:
        classpath 'com.google.gms:google-services:4.3.8'  // Google Services plugin
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        // Check that you have the following line (if not, add it):
        google()  // Google's Maven repository
        jcenter()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots"}
    }
}

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