Add Android Kotlin CI example

Author: adsharma

.github/workflows/android-kotlin.yml

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+name: Android Kotlin
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 8 * * 1"
+
+permissions:
+  contents: read
+
+jobs:
+  build-android-kotlin-app:
+    name: Build Android Kotlin app
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+
+      - uses: android-actions/setup-android@v3
+
+      - name: Install Android SDK packages
+        run: sdkmanager "platforms;android-36" "build-tools;36.0.0"
+
+      - name: Build Ladybug Java jar
+        env:
+          SKIP_CMAKE_BUILD: "true"
+        run: |
+          ./gradlew jar
+          echo "LBUG_JAR=$(ls "$GITHUB_WORKSPACE"/build/libs/lbug-*.jar | head -n 1)" >> "$GITHUB_ENV"
+
+      - name: Build Android Kotlin example
+        run: ./gradlew -p examples/android-kotlin :app:assembleDebug -PlbugJar="$LBUG_JAR"
+
+      - name: Test Android Kotlin example on emulator
+        uses: ReactiveCircus/android-emulator-runner@v2
+        with:
+          api-level: 35
+          target: google_apis
+          arch: x86_64
+          profile: pixel_6
+          script: ./gradlew -p examples/android-kotlin :app:connectedDebugAndroidTest -PlbugJar="$LBUG_JAR"

examples/android-kotlin/app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.ladybugdb.example'
+    compileSdk 36
+
+    defaultConfig {
+        applicationId 'com.ladybugdb.example'
+        minSdk 26
+        targetSdk 36
+        versionCode 1
+        versionName '1.0'
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
+    }
+}
+
+dependencies {
+    def lbugJar = providers.gradleProperty('lbugJar')
+    if (!lbugJar.isPresent()) {
+        throw new GradleException('Pass -PlbugJar=/path/to/lbug.jar')
+    }
+    implementation files(lbugJar.get())
+    androidTestImplementation 'androidx.test:core-ktx:1.6.1'
+    androidTestImplementation 'androidx.test.ext:junit-ktx:1.2.1'
+}

examples/android-kotlin/app/src/androidTest/kotlin/com/ladybugdb/example/MainActivityInstrumentedTest.kt

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+package com.ladybugdb.example
+
+import androidx.test.core.app.ActivityScenario
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotNull
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class MainActivityInstrumentedTest {
+    @Test
+    fun kotlinApiCanCreateConfigOnAndroid() {
+        val config = exampleConfig()
+
+        assertEquals(2, config.maxNumThreads)
+        assertEquals(true, config.enableDefaultHashIndex)
+    }
+
+    @Test
+    fun activityLaunchesOnAndroid() {
+        ActivityScenario.launch(MainActivity::class.java).use { scenario ->
+            scenario.onActivity { activity ->
+                assertNotNull(activity.window.decorView)
+            }
+        }
+    }
+}

examples/android-kotlin/app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:theme="@style/AppTheme"
+        android:label="@string/app_name"
+        android:allowBackup="false"
+        android:supportsRtl="true">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

examples/android-kotlin/app/src/main/kotlin/com/ladybugdb/example/MainActivity.kt

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+package com.ladybugdb.example
+
+import android.app.Activity
+import android.os.Bundle
+import android.widget.TextView
+import com.ladybugdb.Database
+import com.ladybugdb.SystemConfig
+
+class MainActivity : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val config = exampleConfig()
+        setContentView(TextView(this).apply {
+            text = "LadybugDB Kotlin example: ${config.maxNumThreads} threads"
+        })
+    }
+}
+
+fun exampleConfig(): SystemConfig = SystemConfig().apply {
+    maxNumThreads = 2
+    enableDefaultHashIndex = true
+}
+
+fun openDatabase(path: String, config: SystemConfig): Database = Database(path, config)

examples/android-kotlin/app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">LadybugDB Kotlin</string>
+</resources>

examples/android-kotlin/app/src/main/res/values/styles.xml

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+<resources>
+    <style name="AppTheme" parent="android:style/Theme.Material.Light.NoActionBar" />
+</resources>

examples/android-kotlin/build.gradle

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+plugins {
+    id 'com.android.application' version '9.0.0' apply false
+}

examples/android-kotlin/settings.gradle

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+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = 'ladybug-android-kotlin-example'
+include ':app'