Migrate Engine to KMP

engine-kmp-app/build.gradle.kts

@@ -0,0 +1,99 @@
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+  id("org.jetbrains.kotlin.multiplatform")
+  id("com.android.application")
+  id("org.jetbrains.kotlin.plugin.compose")
+  id("org.jetbrains.compose")
+}
+
+android {
+  namespace = "com.example.enginekmpapp"
+  compileSdk = Sdk.COMPILE_SDK
+
+  defaultConfig {
+    applicationId = "com.example.enginekmpapp"
+    minSdk = Sdk.MIN_SDK
+    targetSdk = 36
+    versionCode = 1
+    versionName = "1.0"
+  }
+  packaging { resources { excludes += "/META-INF/{AL2.0,LGPL2.1}" } }
+  buildTypes { getByName("release") { isMinifyEnabled = false } }
+  compileOptions {
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+  }
+}
+
+kotlin {
+  jvmToolchain(21)
+
+  androidTarget { compilerOptions { jvmTarget.set(JvmTarget.JVM_21) } }
+
+  jvm("desktop")
+
+  listOf(
+      iosX64(),
+      iosArm64(),
+      iosSimulatorArm64(),
+    )
+    .forEach { iosTarget ->
+      iosTarget.binaries.framework {
+        baseName = "engineKmpAppKit"
+        isStatic = true
+      }
+    }
+
+  targets.configureEach {
+    compilations.configureEach {
+      compilerOptions.configure {
+        freeCompilerArgs.add("-Xexpect-actual-classes")
+        optIn.addAll(
+          "kotlin.time.ExperimentalTime",
+          "kotlin.uuid.ExperimentalUuidApi",
+        )
+      }
+    }
+  }
+
+  sourceSets {
+    commonMain.dependencies {
+      implementation(compose.runtime)
+      implementation(compose.foundation)
+      implementation(compose.material3)
+      implementation(compose.ui)
+      implementation(libs.kotlinx.coroutines.core)
+      implementation(libs.kotlin.fhir)
+      implementation(project(":engine-kmp"))
+    }
+    androidMain.dependencies {
+      implementation(compose.preview)
+      implementation(libs.androidx.activity.compose)
+    }
+    val desktopMain by getting {
+      dependencies {
+        implementation(compose.desktop.currentOs)
+      }
+    }
+    val iosMain by creating {
+      dependsOn(commonMain.get())
+    }
+    val iosX64Main by getting { dependsOn(iosMain) }
+    val iosArm64Main by getting { dependsOn(iosMain) }
+    val iosSimulatorArm64Main by getting { dependsOn(iosMain) }
+  }
+}
+
+compose.desktop {
+  application {
+    mainClass = "com.example.enginekmpapp.MainKt"
+
+    nativeDistributions {
+      targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+      packageName = "com.example.enginekmpapp"
+      packageVersion = "1.0.0"
+    }
+  }
+}

engine-kmp-app/src/androidMain/AndroidManifest.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:label="Engine KMP Demo"
+        android:supportsRtl="true"
+        android:theme="@android:style/Theme.Material.Light.NoActionBar"
+        android:name=".EngineKmpApplication"
+    >
+        <activity
+            android:exported="true"
+            android:configChanges="orientation|screenSize|screenLayout|keyboardHidden"
+            android:name=".MainActivity"
+        >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

engine-kmp-app/src/androidMain/kotlin/com/example/enginekmpapp/EngineKmpApplication.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2025-2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.enginekmpapp
+
+import android.app.Application
+
+class EngineKmpApplication : Application() {
+  override fun onCreate() {
+    super.onCreate()
+    appContext = this
+  }
+
+  companion object {
+    lateinit var appContext: Application
+      private set
+  }
+}

engine-kmp-app/src/androidMain/kotlin/com/example/enginekmpapp/MainActivity.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2025-2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.enginekmpapp
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+
+class MainActivity : ComponentActivity() {
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    setContent { App(platformContext = applicationContext) }
+  }
+}