android-samples/tutorials/kotlin/MapWithMarker/app/build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 29
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "com.example.mapwithmarker"
        minSdkVersion 16
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        // Read the API key from tutorials/kotlin/MapWithMarker/app/secure.properties into R.string.maps_api_key
        def secureProps = new Properties()
        if (file("secure.properties").exists()) {
            file("secure.properties")?.withInputStream { secureProps.load(it) }
        }
        resValue "string", "maps_api_key", (secureProps.getProperty("MAPS_API_KEY") ?: "")

        // To add your Maps API key to this project:
        // 1. Create a file tutorials/kotlin/MapWithMarker/app/secure.properties
        // 2. Add this line, where YOUR_API_KEY is your API key:
        //        MAPS_API_KEY=YOUR_API_KEY
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "androidx.core:core-ktx:1.2.0"
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.2.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.maps.android:maps-ktx:1.5.0'

    // Tests
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}