Okay, let's set up the basic structure for your Android VPN application with server selection and AdMob integration. This setup includes: 1. Necessary dependencies in `build.gradle.kts`. 2. Permissions and service declaration in `AndroidManifest.xml`. 3. A simple layout (`activity_main.xml`). 4. A data class for Servers (`Server.kt`). 5. A basic `MainActivity.kt` to handle UI, server selection, VPN initiation, and AdMob loading/showing. 6. A placeholder `MyVpnService.kt` extending `VpnService`. **Note:** Implementing a fully functional VPN client within `MyVpnService.kt` is complex and requires handling network protocols (like OpenVPN, WireGuard), TUN/TAP interfaces, and routing. This example provides the structure but not the low-level VPN connection logic. You'll need to integrate a specific VPN protocol library or implement it yourself. // Top-level build file where you can add configuration options common to all sub-projects/modules. plugins { alias(libs.plugins.android.application) apply false alias(libs.plugins.jetbrains.kotlin.android) apply false } import java.util.Properties import java.io.FileInputStream plugins { alias(libs.plugins.android.application) alias(libs.plugins.jetbrains.kotlin.android) } // Function to load properties safely fun loadProperties(filePath: String): Properties { val properties = Properties() try { val file = File(filePath) if (file.exists()) { FileInputStream(file).use { properties.load(it) } } else { println("Warning: Properties file not found at $filePath") } } catch (e: Exception) { println("Warning: Could not load properties file at $filePath: ${e.message}") } return properties } // Load AdMob App ID from local.properties (recommended) val localProperties = loadProperties(rootProject.file("local.properties").path) val admobAppId = localProperties.getProperty("admob.app.id", "ca-app-pub-3940256099942544~3347511713") // Use test ID if not found android { namespace = "com.example.vpnapp" compileSdk = 34 defaultConfig { applicationId = "com.example.vpnapp" minSdk = 21 targetSdk = 34 versionCode = 1 versionName = "1.0" testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner" // Set AdMob App ID from properties or use test ID manifestPlaceholders["admobAppId"] = admobAppId } buildTypes { release { isMinifyEnabled = false proguardFiles( getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro" ) } } compileOptions { sourceCompatibility = JavaVersion.VERSION_1_8 targetCompatibility = JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = "1.8" } buildFeatures { viewBinding = true // Enable View Binding } } dependencies { implementation(libs.androidx.core.ktx) implementation(libs.androidx.appcompat) implementation(libs.material) implementation(libs.androidx.constraintlayout) // AdMob dependency implementation(libs.play.services.ads) // Local Broadcast Manager (optional, but useful for Service-Activity communication) implementation(libs.androidx.localbroadcastmanager) testImplementation(libs.junit) androidTestImplementation(libs.androidx.junit) androidTestImplementation(libs.androidx.espresso.core) } // Define library versions in libs.versions.toml (create if it doesn't exist) // Example libs.versions.toml content: /* [versions] androidGradlePlugin = "8.2.0" # Check latest version kotlin = "1.9.22" # Check latest version coreKtx = "1.12.0" appcompat = "1.6.1" material = "1.11.0" constraintlayout = "2.1.4" playServicesAds = "23.0.0" # Check latest version localbroadcastmanager = "1.1.0" junit = "4.13.2" androidxJunit = "1.1.5" espressoCore = "3.5.1" [libraries] androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" } androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" } material = { group = "com.google.android.material", name = "material", version.ref = "material" } androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" } play-services-ads = { group = "com.google.android.gms", name = "play-services-ads", version.ref = "playServicesAds" } androidx-localbroadcastmanager = { group = "androidx.localbroadcastmanager", name = "localbroadcastmanager", version.ref = "localbroadcastmanager" } junit = { group = "junit", name = "junit", version.ref = "junit" } androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "androidxJunit" } androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" } [plugins] android-application = { id = "com.android.application", version.ref = "androidGradlePlugin" } jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" } */ // Ensure you have a libs.versions.toml file in the gradle directory // or define dependencies directly with versions here.