build.gradle

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

buildscript {

    ext.versions = [
            'supportLibrary'  : '27.1.1',
            'constraintLayout': '1.0.2',
            'firebase'        : '12.0.1',
            'testRunner'      : '1.0.1',
            'espressoCore'    : '3.0.1',
            'leak_canary'     :  '1.5.4'
    ]


    ext.buildConfig = [
            'compileSdk': 27,
            'targetSdk' : 27,
            'minSdk'    : 15,
            'isSnapshot': false,

            'version'   : [
                    'major'     : 1,
                    'minor'     : 0,
                    'patch'     : 0,
                    'classifier': null, // dev, beta, alpha etc.
            ]
    ]

    String versionName = "${buildConfig.version.major}.${buildConfig.version.minor}.${buildConfig.version.patch}"

    if (buildConfig.version.classifier == null) {
        if (buildConfig.isSnapshot) {
            buildConfig.version.classifier = 'SNAPSHOT'
        }
    }

    if (buildConfig.version.classifier != null) {
        versionName += "-" + buildConfig.version.classifier
    }

    ext.buildConfig.version['name'] = versionName
    ext.buildConfig.version['code'] = buildConfig.version.major * 100000 + buildConfig.version.minor * 10000 + buildConfig.version.patch * 100


    ext.deps = [
            'android': [
                    'support': [
                            'appcompatV7'     : "com.android.support:appcompat-v7:${versions.supportLibrary}",
                            'annotations'     : "com.android.support:support-annotations:${versions.supportLibrary}",
                            'constraintLayout': "com.android.support.constraint:constraint-layout:${versions.constraintLayout}",
                            'test'            : [
                                    'runner'      : "com.android.support.test:runner:${versions.testRunner}",
                                    'espressoCore': "com.android.support.test.espresso:espresso-core:${versions.espressoCore}"
                            ]
                    ],
            ],

            'google' : [
                    'firebase': [
                            'auth': "com.google.firebase:firebase-auth:${versions.firebase}"
                    ]
            ],

            'square':[
                'leackcanary':[
                    'debug':"com.squareup.leakcanary:leakcanary-android:${versions.leak_canary}",
                    'release':"com.squareup.leakcanary:leakcanary-android-no-op:${versions.leak_canary}"
                ]
            ],

            'junit'  : 'junit:junit:4.12'
    ]

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }

    // Force all of the primary support libraries to use the same version.
    configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support') {
                details.useVersion versions.supportLibrary
            }
        }
    }
}

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