showing the build.gradle file for a sub project using a dependencies.gradle file in a multi-project build

sub-project build.gradle

apply plugin: 'com.android.library'

//Declaring a variable to points to the ext list we added to in the dependencies.gradle
def globalConf = rootProject.ext

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"

    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    //Declaring that we have a map of the dependency title and the dependency definition
    Map<String, String> dependencies = globalConf.commonDependencies

    //We can still exclude other dependencies
    androidTestCompile (dependencies.espressoCore, {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    testCompile dependencies.jUnit

    //Normal dependency Declaration
    compile dependencies.appCompat
    compile dependencies.kotlinStdLib
    compile dependencies.rxJava

    //Sub Project Dependencies
    compile project(':core')
}