build.gradle

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

buildscript {
    repositories {
        google()
        jcenter()
        maven { url "https://plugins.gradle.org/m2/" }
        maven { url "https://jitpack.io" }
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.0-alpha12'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        classpath 'com.google.gms:google-services:4.3.2'
        // For already prepared opencv-3.4.1-sdk
        // maven { url  "https://dl.bintray.com/blazei/maven" }
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven { url "https://jitpack.io" }
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        maven { url "https://plugins.gradle.org/m2/" }
    }
}

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