APK signing infra

justfile

@@ -11,3 +11,12 @@ run-android *args:
     export ANDROID_HOME="$HOME/Android/Sdk"
     export NDK_HOME="$ANDROID_HOME/ndk/28.0.12433566"
     {{args}}
+
+
+# See https://tauri.app/distribute/sign/android/
+[doc: "Sign Android APK"]
+prepare-sign-apk password="test-password":
+    echo "password={{password}}" > ./src-tauri/gen/android/keystore.properties
+    echo "keyAlias=upload" >> ./src-tauri/gen/android/keystore.properties
+    echo "storeFile=/home/greg/upload-keystore.jks" >> ./src-tauri/gen/android/keystore.properties
+

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

@@ -0,0 +1,85 @@
+import java.util.Properties
+import java.io.FileInputStream
+
+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) }
+    }
+}
+
+android {
+    compileSdk = 34
+    namespace = "com.gensoukyou_tauri.app"
+    defaultConfig {
+        manifestPlaceholders["usesCleartextTraffic"] = "false"
+        applicationId = "com.gensoukyou_tauri.app"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = tauriProperties.getProperty("tauri.android.versionCode", "1").toInt()
+        versionName = tauriProperties.getProperty("tauri.android.versionName", "1.0")
+    }
+    signingConfigs {
+    create("release") {
+        val keystorePropertiesFile = rootProject.file("keystore.properties")
+        val keystoreProperties = Properties()
+        if (keystorePropertiesFile.exists()) {
+            keystoreProperties.load(FileInputStream(keystorePropertiesFile))
+        }
+
+        keyAlias = keystoreProperties["keyAlias"] as String
+        keyPassword = keystoreProperties["password"] as String
+        storeFile = file(keystoreProperties["storeFile"] as String)
+        storePassword = keystoreProperties["password"] as String
+    }
+}
+    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") {
+          signingConfig = signingConfigs.getByName("release")
+            isMinifyEnabled = true
+            proguardFiles(
+                *fileTree(".") { include("**/*.pro") }
+                    .plus(getDefaultProguardFile("proguard-android-optimize.txt"))
+                    .toList().toTypedArray()
+            )
+        }
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+    buildFeatures {
+        buildConfig = true
+    }
+}
+
+rust {
+    rootDirRel = "../../../"
+}
+
+dependencies {
+    implementation("androidx.webkit:webkit:1.6.1")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.8.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.4")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.0")
+}
+
+apply(from = "tauri.build.gradle.kts")