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

plugins {
    id 'com.android.application'
    id 'com.google.android.libraries.mapsplatform.secrets-gradle-plugin'
}

android {
    compileSdkVersion 31
    buildToolsVersion "28.0.3"
    defaultConfig {
        applicationId "com.example.mapwithmarker"
        minSdkVersion 19
        targetSdkVersion 31
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

// [START maps_android_play_services_maps_dependency]
dependencies {
    implementation 'com.google.android.gms:play-services-maps:18.0.0'
    // [START_EXCLUDE]
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.3.1'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
    // [END_EXCLUDE]
}
// [END maps_android_play_services_maps_dependency]

secrets {
    // To add your Maps API key to this project:
    // 1. Open the root project's local.properties file
    // 2. Add this line, where YOUR_API_KEY is your API key:
    //        MAPS_API_KEY=YOUR_API_KEY
    defaultPropertiesFileName 'local.defaults.properties'
}