Migrate from version 100.x to version 200.x

ArcGIS Runtime SDK version 100.15 is a long-term support release focused exclusively on bug fixes and minor updates. ArcGIS Maps SDKs for Native apps version 200.x builds on the proven architecture of 100.15, and is designed to leverage the latest developer framework innovations. This topic outlines areas of the API that have undergone changes and provides guidance for re-factoring 100.x code for a 200.x app.

Release 200.0 introduces a new Kotlin-based API for Android called "ArcGIS Maps SDK for Kotlin".

This release is a full reimagining of the ArcGIS Runtime SDK for Android as a Kotlin-first SDK, with out-of-the-box support for features like coroutines, flows, and null safety. The Java-based ArcGIS Runtime SDK for Android will receive long-term support (LTS), with ongoing bug fixes but no further feature updates.

To utilize the new features, migrate to ArcGIS Maps SDK for Kotlin, which replaces the Java-based ArcGIS Runtime SDK for Android. For more information, check out the blog ArcGIS Runtime in 2022 and beyond.

LifeCycleObserver

The GeoView class is a base class for MapView and SceneView, which implements the DefaultLifecycleObserver. Hence, forwarding lifecycle events like onResume, onPause, onDestroy to a GeoView is not required anymore.

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override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    // set the API key
    ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.API_KEY)
    // set up data binding for the activity
    val activityMainBinding: ActivityMainBinding =
        DataBindingUtil.setContentView(this, R.layout.activity_main)
    mapView = activityMainBinding.mapView
    // add the MapView to the activity's lifecycle
    lifecycle.addObserver(mapView)
}

Coroutines and Coroutines Scope

Kotlin's suspending function is safer and less error-prone for asynchronous operations. All suspend functions return a Result, so there is no longer a need for try/catch block. Additionally, you can launch a coroutine using a lifecycle-aware coroutine scope, which will be canceled automatically if the lifecycle is destroyed.

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lifecyleScope.launch {
    // run the suspend function to get a geodatabase
    val geodatabaseResult = Geodatabase.create(filePath)
    // get the result once suspend is completed
    geodatabaseResult.onSuccess { geodatabase ->
        // run the suspend function to create a geodatabase feature table
        val featureTableResult = geodatabase.createTable(tableDescription)
        // get the result once suspend is completed
        featureTableResult.onSuccess { geodatabaseFeatureTable ->
            setupMapFromGeodatabase(geodatabaseFeatureTable)
        }.onFailure { throwable ->
            showMessage(throwable.message)
        }
    }.onFailure { throwable ->
        showMessage(throwable.message)
    }
}

Events Handling

All events are now represented using SharedFlow, so callbacks are no longer necessary.

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val simulatedLocationDataSource = SimulatedLocationDataSource(polyline)
simulatedLocationDataSource.start()
simulatedLocationDataSource.locationChanged.collect { location ->
    val locationPoint = location.position
}

Loadable

Loadable state (LoadStatus) is represented using a StateFlow, while load() is a suspending function which returns a load process complete Result<Unit>. The load error can be obtained from the Result if it fails.

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private suspend fun loadPortalItem() {
    val portalItem = PortalItem(Portal("https://www.arcgis.com"), itemID)
    portalItem.load().onSuccess {
        val featureLayer = FeatureLayer(portalItem)
        setFeatureLayer(featureLayer, viewpoint)
    }.onFailure { throwable ->
        showError(throwable.message)
    }
}

There's an asynchronous way to listen to LoadStatus updates, as it is now a StateFlow. This way, you can get the intermediate LoadStatus values.

ArcGIS Maps SDK for Kotlin v200.x
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lifecycleScope.launch {
   portalItem.load()
}
lifecycleScope.launch {
    portalItem.loadStatus.collect { loadStatus ->
        when (loadStatus) {
            LoadStatus.Loaded -> {
                val featureLayer = FeatureLayer(portalItem)
                setFeatureLayer(featureLayer)
            }
            is LoadStatus.FailedToLoad -> {
                showError("Error loading portal item: ${loadStatus.error.message}")
            }
            LoadStatus.Loading -> { ... }
            LoadStatus.NotLoaded -> { ... }
        }
    }
}

Tasks & Jobs

ArcGIS Maps SDK for Kotlin substantially changes the Jobs or Tasks workflow. A job needs to be run in a CoroutineScope, which provides control over the flow of the progress or completion. Multiple jobs and tasks can be performed using coroutine flows which help to avoid working with nested callbacks.

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// create a new offline map task
val offlineMapTask = OfflineMapTask(mapView.map)
// set the parameters of the task
val generateOfflineMapParameters = GenerateOfflineMapParameters(
    geometry, minScale, maxScale
)
// create a job with the offline map parameters
val offlineMapJob = offlineMapTask.generateOfflineMap(
    generateOfflineMapParameters,
    offlineMapPath
)
// start the job
offlineMapJob.start()
with (lifecycleScope) {
    // collect the progress of the job
    launch {
        offlineMapJob.progress.collect {
            val progressPercentage = offlineMapJob.progress.value
        }
    }
    // display map if job succeeds
    launch {
        offlineMapJob.result().onSuccess { offlineMapResult ->
            mapView.map = offlineMapResult.offlineMap
        }.onFailure { throwable ->
            showMessage(throwable.message.toString())
        }
    }
}

Geometry and Geometry Builders

There are several changes to the usage of geometries and geometry builders to improve readability and ease of use.

  • Geometry builders like PolylineBuilder and PolygonBuilder now takes a function parameter with the builder as the receiver type, allowing you to add geometries to the builder in a Kotlin idiomatic way

  • A Part can be created with segments using MutablePart.createWithSegments

  • The names of mutable and immutable geometry collection types are aligned with Kotlin idioms. Below is a list of geometry types defined in ArcGIS Maps SDK for Kotlin that is analogous to ArcGIS Runtime API for Android.

    • MutablePart <- Part
    • Part <- ImmutablePart
    • MutablePartCollection <- PartCollection
    • PartCollection <- ImmutablePartCollection
  • Part and MutablePart may be viewed as a collection of points by accessing the .points property

  • GeometryEngine methods are generic to provide greater type safety hence an identical geometry is returned as shown below.

    ArcGIS Maps SDK for Kotlin v200.x
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    fun <T : Geometry> project(geometry: T, outputSpatialReference: SpatialReference, datumTransformation: DatumTransformation?): T
    fun <T : Geometry> project(geometry: T, spatialReference: SpatialReference): T
    fun <T : Geometry> simplify(geometry: T): T
    fun <T : Geometry> setM(geometry: T, m: Double?): T
    fun <T : Geometry> setZ(geometry: T, z: Double?): T
    fun <T : Geometry> setZAndM(geometry: T, z: Double?, m: Double?): T
    
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// Make a polyline geometry
val polylineGeometry = PolylineBuilder(spatialReference) {
    addPoint(-10e5, 40e5)
    addPoint(20e5, 50e5)
}.toGeometry()

// Make a part geometry using segments
val partGeometry = MutablePart.createWithSegments(
    listOf(leftCurve, leftArc, rightArc, rightCurve),
    spatialReference
)
val polygon = Polygon(listOf(partGeometry))

Gestures

MapView and SceneView have gesture events instead of overriding DefaultMapViewOnTouchListener. The events are represented as SharedFlows and can be collected in a coroutine.

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lifecycleScope.launch {
    mapView.onSingleTapConfirmed.collect { tapConfirmedEvent ->
        val mapPoint = tapConfirmedEvent.mapPoint
        val screenCoordinate = tapConfirmedEvent.screenCoordinate
    }
}

Authentication

ArcGIS Maps SDK for Kotlin has a different approach for working with secured ArcGIS services. The SDK provides a set of asynchronous APIs to create ArcGIS credentials and generate tokens independent of loading any specific secured resource. The credentials created while handling authentication challenges are stored and re-used while sending subsequent requests.

ArcGIS Maps SDK for Kotlin v200.x
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