build.gradle

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

buildscript {
    repositories {
        jcenter()
        mavenCentral()
        maven { url "https://maven.google.com" }
        maven { url "https://jitpack.io" }

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
    }
}

allprojects {
    repositories {
        jcenter()
        mavenCentral()
        maven { url "https://maven.google.com" }
        maven { url "https://jitpack.io" }
    }
}

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

class GreetingTask extends DefaultTask {
}

task gradleUpdates(type: GreetingTask) {
    doLast {
    tasks.dependencyUpdates.execute()
    println ''
    group = "wrapper"
        ["nightly": "nightly",
         "rc"     : "release-candidate",
         "current": "current"].each {
            def label = it.value
            def version = new groovy.json.JsonSlurper().parseText(new URL("https://services.gradle.org/versions/${label}").text)
            if (version.empty) {
                throw new GradleException("Cannot update wrapper to '${label}' version as there is currently no version of that label")
            }
            println " -${label} version: ${version.version} (downloadUrl: ${version.downloadUrl})"
        }
    }
}

subprojects { //check dependecies that may cause error contains -> ./gradlew -q allDeps --configuration releaseUnitTestCompileClasspath | grep ' -> ' -B 3
    task allDeps(type: DependencyReportTask) {}
}