BikeControl/src-tauri/android/app/build.gradle.kts

import java.util.Properties

/**
 * Tracked replacement for the app module's build script.
 *
 * `tauri android init` regenerates gen/android from scratch, so this file is
 * the source of truth and scripts/sync-android-sources.sh copies it back into
 * place afterwards. It differs from Tauri's generated version in two ways:
 * release signing is read from a keystore.properties written by CI, and the
 * BLE Java sources synced in from the btleplug/jni-utils crates are kept out of
 * R8's reach.
 */

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("rust")
}

val tauriProperties = Properties().apply {
    val propFile = file("tauri.properties")
    if (propFile.exists()) {
        propFile.inputStream().use { load(it) }
    }
}

// Release signing. CI writes gen/android/keystore.properties from secrets; when
// it is absent (any local build) the release variant simply stays debug-signed
// rather than failing the build.
val keystoreProperties = Properties().apply {
    val propFile = rootProject.file("keystore.properties")
    if (propFile.exists()) {
        propFile.inputStream().use { load(it) }
    }
}

android {
    compileSdk = 36
    namespace = "paris.tourolle.bikecontrol"

    defaultConfig {
        manifestPlaceholders["usesCleartextTraffic"] = "false"
        applicationId = "paris.tourolle.bikecontrol"
        // 24 is Tauri's floor and also btleplug's: the jni-utils Java support
        // classes use java.util.function, which arrived in API 24.
        minSdk = 24
        targetSdk = 36
        versionCode = tauriProperties.getProperty("tauri.android.versionCode", "1").toInt()
        versionName = tauriProperties.getProperty("tauri.android.versionName", "1.0")
    }

    signingConfigs {
        create("release") {
            keystoreProperties.getProperty("storeFile")?.let {
                storeFile = file(it)
                storePassword = keystoreProperties.getProperty("storePassword")
                keyAlias = keystoreProperties.getProperty("keyAlias")
                keyPassword = keystoreProperties.getProperty("keyPassword")
            }
        }
    }

    buildTypes {
        getByName("debug") {
            manifestPlaceholders["usesCleartextTraffic"] = "true"
            isDebuggable = true
            isJniDebuggable = true
            isMinifyEnabled = false
            packaging {
                jniLibs.keepDebugSymbols.add("*/arm64-v8a/*.so")
                jniLibs.keepDebugSymbols.add("*/armeabi-v7a/*.so")
                jniLibs.keepDebugSymbols.add("*/x86/*.so")
                jniLibs.keepDebugSymbols.add("*/x86_64/*.so")
            }
        }
        getByName("release") {
            if (keystoreProperties.getProperty("storeFile") != null) {
                signingConfig = signingConfigs.getByName("release")
            }
            isMinifyEnabled = true
            proguardFiles(
                *fileTree(".") { include("**/*.pro") }
                    .plus(getDefaultProguardFile("proguard-android-optimize.txt"))
                    .toList().toTypedArray()
            )
        }
    }

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }

    buildFeatures {
        buildConfig = true
    }
}

rust {
    rootDirRel = "../../../"
}

dependencies {
    implementation("androidx.webkit:webkit:1.14.0")
    implementation("androidx.appcompat:appcompat:1.7.1")
    // requestPermissions via the Activity Result API (MainActivity.kt).
    implementation("androidx.activity:activity-ktx:1.10.1")
    implementation("com.google.android.material:material:1.12.0")

    // btleplug's Java backend and the jni-utils support classes are NOT maven
    // dependencies: they are copied into app/src/main/java from the crate
    // sources by scripts/sync-android-sources.sh, so the Java always matches
    // the Rust in Cargo.lock. Upstream's suggested route — a
    // 0.1.1-SNAPSHOT artifact published to mavenLocal by hand — cannot be
    // reproduced on a CI runner and drifts silently from the crate.
}

apply(from = "tauri.build.gradle.kts")