sizzletracker-android/app/build.gradle.kts

// Build configuration for the single application module. This is where we turn
// on Compose, set the min/target Android versions, and list dependencies.

plugins {
    alias(libs.plugins.android.application)
    alias(libs.plugins.kotlin.android)
    alias(libs.plugins.kotlin.compose)
}

android {
    namespace = "space.rcmd.android.sizzle"
    compileSdk = 34

    // Native (Oboe) low-latency output backend; see src/main/cpp.
    // NDK r27+ builds native libs 16 KB-page-aligned by default and ships a
    // 16 KB-aligned libc++_shared.so (required for Android 15 / Google Play).
    ndkVersion = "27.2.12479018"

    defaultConfig {
        applicationId = "space.rcmd.android.sizzle"
        // minSdk 26 (Android 8.0) is the floor for the native MIDI API
        // (android.media.midi) and AAudio low-latency audio we rely on.
        minSdk = 26
        targetSdk = 34
        versionCode = 18
        versionName = "0.6.0"

        // We provide our own instrumentation runner if/when tests are added.
        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

        externalNativeBuild {
            cmake { arguments += "-DANDROID_STL=c++_shared" }
        }
    }

    externalNativeBuild {
        cmake {
            path = file("src/main/cpp/CMakeLists.txt")
            version = "3.22.1"
        }
    }

    buildTypes {
        release {
            // Shrinking is off by default so newcomers get readable stack traces.
            // Flip to true once the app stabilises.
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro",
            )
        }

        // A realistic-performance "staging" variant for testing UI responsiveness
        // on-device. The `debug` build is `debuggable = true`, which makes ART run
        // the app un-optimised and makes Compose several times slower — so measuring
        // UI "snappiness" on a debug build is misleading. This variant flips
        // debuggability off (the single biggest perf lever) while reusing the debug
        // signing key, so it still installs without a release keystore. R8/shrinking
        // stays off to avoid needing JNI/Compose keep-rules for now.
        create("staging") {
            initWith(getByName("debug"))
            isDebuggable = false
            isJniDebuggable = false
            signingConfig = signingConfigs.getByName("debug")
            matchingFallbacks += "debug"
        }
    }

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }

    kotlinOptions {
        jvmTarget = "17"
    }

    buildFeatures {
        compose = true
        prefab = true // exposes the Oboe AAR's native headers/lib to CMake
    }

    packaging {
        resources.excludes += "/META-INF/{AL2.0,LGPL2.1}"
    }
}

// Give the release APK a predictable, versionCode-stamped name so it drops straight
// into the private F-Droid repo: space.rcmd.android.sizzle_<versionCode>.apk. Uses
// the legacy variant API (the Kotlin-DSL `android {}` receiver doesn't expose it).
(extensions.getByName("android") as com.android.build.gradle.AbstractAppExtension)
    .applicationVariants.all {
        if (buildType.name == "release") {
            val vc = versionCode
            outputs.all {
                (this as com.android.build.gradle.internal.api.BaseVariantOutputImpl)
                    .outputFileName = "space.rcmd.android.sizzle_$vc.apk"
            }
        }
    }

dependencies {
    implementation(libs.androidx.core.ktx)
    implementation(libs.androidx.lifecycle.runtime.ktx)
    implementation(libs.androidx.lifecycle.viewmodel.compose)
    implementation(libs.androidx.activity.compose)

    // Compose UI toolkit — the BOM keeps every Compose artifact on one version.
    implementation(platform(libs.androidx.compose.bom))
    implementation(libs.androidx.compose.ui)
    implementation(libs.androidx.compose.ui.graphics)
    implementation(libs.androidx.compose.ui.tooling.preview)
    implementation(libs.androidx.compose.foundation)
    implementation(libs.androidx.compose.material3)
    implementation(libs.androidx.compose.material.icons.extended)
    debugImplementation(libs.androidx.compose.ui.tooling)

    // Background playback + media-style notification transport controls.
    implementation(libs.androidx.media3.session)
    implementation(libs.androidx.media3.common)

    // Persistence for settings & themes.
    implementation(libs.androidx.datastore.preferences)

    // Coroutines for the audio/sequencer background work.
    implementation(libs.kotlinx.coroutines.android)

    // Oboe: low-latency native audio (AAudio) — the native output backend.
    // 1.9.3+ ships 16 KB-page-aligned .so files (required by Android 15 / Play).
    implementation("com.google.oboe:oboe:1.10.0")

    // JVM unit tests for the pure model/io logic (no device needed).
    testImplementation("junit:junit:4.13.2")
    // Virtual-time coroutine testing (drives the input hold-to-repeat schedule).
    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.9.0")
}