Sample app with stub polyline library.

.github/workflows/build-kotlin.yml

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+name: build-kotlin
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+defaults:
+  run:
+    work-directory: ./kotlin/
+
+concurrency:
+  # cancel jobs on PRs only
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checking out branch
+        uses: actions/checkout@v4
+
+      - name: Setup Java 
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Unit test
+        run: ./gradlew test

kotlin/app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.androidApplication)
+    alias(libs.plugins.jetbrainsKotlinAndroid)
+}
+
+android {
+    namespace = "software.amazon.location.polyline"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "software.amazon.location.polyline"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+dependencies {
+
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+    implementation(libs.material)
+    implementation(libs.androidx.activity)
+    implementation(libs.androidx.constraintlayout)
+    implementation(project(":polyline"))
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+
+    implementation("org.maplibre.gl:android-sdk:11.2.0")
+}

kotlin/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

kotlin/app/src/androidTest/java/software/amazon/location/polylinedemo/ExampleInstrumentedTest.kt

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+package software.amazon.location.polylinedemo
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("software.amazon.location.polyline", appContext.packageName)
+    }
+}

kotlin/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.PolylineDemo"
+        tools:targetApi="31">
+        <activity
+            android:name="software.amazon.location.polylinedemo.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>

kotlin/app/src/main/java/software/amazon/location/polylinedemo/MainActivity.kt

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+package software.amazon.location.polylinedemo
+
+import androidx.appcompat.app.AppCompatActivity
+import android.graphics.Color
+import android.os.Bundle
+import android.view.LayoutInflater
+import org.maplibre.android.MapLibre
+import org.maplibre.android.camera.CameraPosition
+import org.maplibre.android.geometry.LatLng
+import org.maplibre.android.maps.MapView
+import org.maplibre.android.style.layers.LineLayer
+import org.maplibre.android.style.layers.Property
+import org.maplibre.android.style.layers.PropertyFactory
+import org.maplibre.android.style.sources.GeoJsonOptions
+import org.maplibre.android.style.sources.GeoJsonSource
+
+import software.amazon.location.polyline.R
+import software.amazon.location.polyline.encodeFromLngLatArray
+import software.amazon.location.polyline.decodeToLineStringFeature
+
+class MainActivity : AppCompatActivity() {
+
+    // Declare a variable for MapView
+    private lateinit var mapView: MapView
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        // Init MapLibre
+        MapLibre.getInstance(this)
+
+        // Init layout view
+        val inflater = LayoutInflater.from(this)
+        val rootView = inflater.inflate(R.layout.activity_main, null)
+        setContentView(rootView)
+
+        // Init the MapView
+        mapView = rootView.findViewById(R.id.mapView)
+        mapView.getMapAsync { map ->
+            map.setStyle("https://demotiles.maplibre.org/style.json") { style ->
+
+                val lngLatArray : Array<DoubleArray> = arrayOf(
+                    doubleArrayOf(-28.193, -61.38823),
+                    doubleArrayOf(-26.78675, -45.01442),
+                    doubleArrayOf(-9.20863, -43.2583),
+                    doubleArrayOf(-9.20863, -52.20348),
+                    doubleArrayOf(-26.78675, -53.26775),
+                    doubleArrayOf(-28.193, -61.38823),
+                    doubleArrayOf(-20.10706, -61.21942),
+                    doubleArrayOf(-19.05238, -57.07888),
+                    doubleArrayOf(-8.85706, -57.07888),
+                    doubleArrayOf(-9.20863, -61.21942),
+                    doubleArrayOf(-20.10706, -61.21942),
+                    doubleArrayOf(-0.068, -60.70753),
+                    doubleArrayOf(2.7445, -43.75829),
+                    doubleArrayOf(-0.068, -60.70753),
+                    doubleArrayOf(11.182, -60.53506),
+                    doubleArrayOf(6.96325, -55.11851),
+                    doubleArrayOf(11.182, -60.53506),
+                    doubleArrayOf(16.807, -54.51079),
+                    doubleArrayOf(3.47762, -65.61471),
+                    doubleArrayOf(11.182, -60.53506),
+                    doubleArrayOf(22.432, -60.18734),
+                    doubleArrayOf(25.59606, -42.99168),
+                    doubleArrayOf(22.432, -60.18734),
+                    doubleArrayOf(31.22106, -59.83591),
+                    doubleArrayOf(32.62731, -53.05697),
+                    doubleArrayOf(31.22106, -59.83591),
+                    doubleArrayOf(38.25231, -59.65879),
+                    doubleArrayOf(40.36169, -53.05697),
+                    doubleArrayOf(40.01012, -54.71438),
+                    doubleArrayOf(44.22887, -53.26775),
+                    doubleArrayOf(47.39294, -55.5186),
+                    doubleArrayOf(46.68981, -59.65879),
+                    doubleArrayOf(53.72106, -59.30172),
+                    doubleArrayOf(51.26012, -56.11118),
+                    doubleArrayOf(56.182, -53.89389),
+                    doubleArrayOf(60.40075, -56.69477),
+                    doubleArrayOf(51.26012, -56.11118),
+                    doubleArrayOf(53.72106, -59.30172),
+                    doubleArrayOf(58.64294, -59.48073),
+                );
+
+                // Encode and decode the route polyline to demonstrate how the APIs are used.
+                val routePolyline = encodeFromLngLatArray(lngLatArray);
+                val decodedGeoJSON =
+                    decodeToLineStringFeature(routePolyline);
+
+                style.addSource(
+                    GeoJsonSource(
+                        "polylineSource",
+                        decodedGeoJSON,
+                        GeoJsonOptions().withLineMetrics(true)
+                    )
+                )
+
+                style.addLayer(
+                    LineLayer("polyline", "polylineSource")
+                        .withProperties(
+                            PropertyFactory.lineColor(Color.RED),
+                            PropertyFactory.lineWidth(2.0f),
+                            PropertyFactory.lineCap(Property.LINE_CAP_ROUND),
+                            PropertyFactory.lineJoin(Property.LINE_JOIN_ROUND)
+                        )
+                )
+            }
+
+            map.cameraPosition = CameraPosition.Builder().target(LatLng(0.0,0.0)).zoom(1.0).build()
+        }
+    }
+
+    override fun onStart() {
+        super.onStart()
+        mapView.onStart()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        mapView.onResume()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        mapView.onPause()
+    }
+
+    override fun onStop() {
+        super.onStop()
+        mapView.onStop()
+    }
+
+    override fun onLowMemory() {
+        super.onLowMemory()
+        mapView.onLowMemory()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        mapView.onDestroy()
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        mapView.onSaveInstanceState(outState)
+    }
+}