Find a route and directions

Learn how to find a route and directions with the route service.

Routing is the process of finding the path from an origin to a destination in a street network. You can use the Routing service to find routes, get driving directions, calculate drive times, and solve complicated, multiple vehicle routing problems. To create a route, you typically define a set of stops (origin and one or more destinations) and use the service to find a route with directions. You can also use a number of additional parameters such as barriers and mode of travel to refine the results.

In this tutorial, you define an origin and destination by clicking on the map. These values are used to get a route and directions from the route service. The directions are also displayed on the map.

Prerequisites

Steps

Open an Android Studio project

1. To start this tutorial, complete the Display a map tutorial, or download and unzip the solution in a new folder.

2. Modify the old project for use in this new tutorial. Expand More info for instructions.

   More info

   1. On your file system, delete the .idea folder, if present, at the top level of your project.

   2. In the Android tool window, open app > res > values > strings.xml.

      In the <string name="app_name"> element, change the text content to Display a web map.

      strings.xml

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      3
      <resources>
          <string name="app_name">Add a point, line, and polygon</string>
      </resources>

   3. In the Android tool window, open Gradle Scripts > settings.gradle.

      Change the value of rootProject.name to "Find a route and directions".

      settings.gradle

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      Change line

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      include ':app'
      rootProject.name = "Add a point, line, and polygon"

   4. Click File > Sync Project with Gradle files. Android Studio will recognize your changes and create a new .idea folder.

3. If you downloaded the solution project, set your API key.

   More info

   An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

   1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

   2. In Android Studio: in the Android tool window, open app > java > com.example.app > MainActivity.

   3. In the setupMap function, set the apiKey property on the ArcGISRuntimeEnvironment with your API key.

      MainActivity.kt

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      /*
       * Copyright 2020 Esri
       *
       * 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
       *
       *    https://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.app
      
      
      import android.os.Bundle
      import androidx.appcompat.app.AppCompatActivity
      import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
      import com.esri.arcgisruntime.mapping.ArcGISMap
      import com.esri.arcgisruntime.mapping.BasemapStyle
      import com.esri.arcgisruntime.mapping.Viewpoint
      import com.esri.arcgisruntime.mapping.view.MapView
      import com.example.app.databinding.ActivityMainBinding
      
      
      class MainActivity : AppCompatActivity() {
      
          private val activityMainBinding by lazy {
            ActivityMainBinding.inflate(layoutInflater)
          }
      
          private val mapView: MapView by lazy {
            activityMainBinding.mapView
          }
      
          override fun onCreate(savedInstanceState: Bundle?) {
              super.onCreate(savedInstanceState)
      
              setContentView(activityMainBinding.root)
      
              setupMap()
      
          }
      
          override fun onPause() {
              mapView.pause()
              super.onPause()
          }
      
          override fun onResume() {
              super.onResume()
              mapView.resume()
          }
      
          override fun onDestroy() {
              mapView.dispose()
              super.onDestroy()
          }
      
      
          // set up your map here. You will call this method from onCreate()
          private fun setupMap() {
      
              // set your API key
              // Note: it is not best practice to store API keys in source code. The API key is referenced
              // here for the convenience of this tutorial.
              ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
      
              // create a map with the BasemapStyle streets
              val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)
      
              // set the map to be displayed in the layout's MapView
              mapView.map = map
              // set the viewpoint, Viewpoint(latitude, longitude, scale)
              mapView.setViewpoint(Viewpoint(34.0270, -118.8050, 72000.0))
      
          }
      
      }
      

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Add import statements and class properties

Add import statements and class properties to reference the packages and classes required for this tutorial.

1. Highlight the existing imports and replace with the imports needed for this tutorial.

   MainActivity.kt

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

2. Within the MainActivity class, add the following class properties. These will be used in multiple functions within this tutorial.

   MainActivity.kt

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

Update the map

A streets basemap layer is typically used in routing applications. Update the basemap to use the ARCGIS_STREETS basemap style, change the position of the map to center on Los Angeles and add a GraphicsOverlay.

1. In the setupMap() function, update the Basemap style property from ARCGIS_TOPOGRAPHIC to ARCGIS_STREETS, and update the latitude and longitude coordinates to center on Los Angeles.

   MainActivity.kt

   Show more lines

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

   Show more lines

2. Add the graphicsOverlay to the mapView. A graphics overlay is a container for graphics. Graphics will be added later in this tutorial as a visual means to display the route stops and route result on the map.

   MainActivity.kt

   Show more lines

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   Add line.

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

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Add a ListView to display driving directions

To display the turn-by-turn directions from the route, use an Android list view to display it on the screen.

1. In the activity_main.xml file, create an AndroidListView which will display a vertical list of directions.

   activity_main.xml

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   <?xml version="1.0" encoding="utf-8"?>
   <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:app="http://schemas.android.com/apk/res-auto"
           xmlns:tools="http://schemas.android.com/tools"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           tools:context=".MainActivity">
   
       <com.esri.arcgisruntime.mapping.view.MapView
               android:id="@+id/mapView"
               android:layout_width="match_parent"
               android:layout_height="match_parent" />
   
       <ListView
               android:id="@+id/listView"
               android:layout_width="0dp"
               android:layout_height="0dp"
               android:background="@android:drawable/screen_background_light"
               app:layout_constraintHeight_percent="0.35"
               app:layout_constraintWidth_percent="0.5"
               app:layout_constraintStart_toStartOf="parent"
               app:layout_constraintTop_toTopOf="parent" />
   
   </androidx.constraintlayout.widget.ConstraintLayout>

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2. In MainActivity.kt, in the onCreate() function, set the arrayAdapter to the listView. The ArrayAdapter will create and populate the listView with TextViews as required.

   MainActivity.kt

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

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Create an addStops function

A RouteTask requires at least a single origin and destination stop to find a route. Create a function to handle user interaction with the map and to add stops and display them as graphics when the map is tapped.

1. Create an addStop(stop) function.

   MainActivity.kt

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

   Show more lines

2. Add the stop to the MutableList<Stop> called routeStops.

   MainActivity.kt

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   Add line.

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   /*
    * Copyright 2021 Esri
    *
    * 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
    *
    *    https://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.app
   
   
   import android.R.layout
   import android.graphics.Color
   import android.os.Bundle
   import android.util.Log
   import android.view.MotionEvent
   import android.widget.ArrayAdapter
   import android.widget.ListView
   import android.widget.Toast
   import androidx.appcompat.app.AppCompatActivity
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
   import com.esri.arcgisruntime.mapping.ArcGISMap
   import com.esri.arcgisruntime.mapping.BasemapStyle
   import com.esri.arcgisruntime.mapping.Viewpoint
   import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
   import com.esri.arcgisruntime.mapping.view.Graphic
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
   import com.esri.arcgisruntime.mapping.view.MapView
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
   import com.esri.arcgisruntime.tasks.networkanalysis.RouteTask
   import com.esri.arcgisruntime.tasks.networkanalysis.Stop
   import com.example.app.databinding.ActivityMainBinding
   import kotlin.math.roundToInt
   
   
   
   class MainActivity : AppCompatActivity() {
   
       private val activityMainBinding: ActivityMainBinding by lazy {
           ActivityMainBinding.inflate(layoutInflater)
       }
   
       private val mapView: MapView by lazy {
           activityMainBinding.mapView
       }
   
   
       private val listView: ListView by lazy {
           activityMainBinding.listView
       }
   
       private val directionsList: MutableList<String> by lazy {
           mutableListOf("Tap to add two points to the map to find a route between them.")
       }
   
       private val arrayAdapter by lazy {
           ArrayAdapter(this, layout.simple_list_item_1, directionsList)
       }
   
       private val routeStops: MutableList<Stop> by lazy {
           mutableListOf()
       }
   
       private val graphicsOverlay: GraphicsOverlay by lazy {
           GraphicsOverlay()
       }
   
   
       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           setContentView(activityMainBinding.root)
   
           listView.adapter = arrayAdapter
   
           setupMap()
   
       }
   
   
       override fun onPause() {
           mapView.pause()
           super.onPause()
       }
   
       override fun onResume() {
           super.onResume()
           mapView.resume()
       }
   
       override fun onDestroy() {
           mapView.dispose()
           super.onDestroy()
       }
   
   
       // set up your map here. You will call this method from onCreate()
       private fun setupMap() {
   
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
           ArcGISRuntimeEnvironment.setApiKey("YOUR_API_KEY")
   
           val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
   
           mapView.apply {
               // set the map on the map view
               this.map = map
   
               setViewpoint(Viewpoint(34.0539, -118.2453, 144447.638572))
   
               graphicsOverlays.add(graphicsOverlay)
   
               onTouchListener =
                   object : DefaultMapViewOnTouchListener(this@MainActivity, mapView) {
                       override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
                           val screenPoint = android.graphics.Point(e.x.roundToInt(), e.y.roundToInt())
                           when (routeStops.size) {
                               // on first tap, add a stop
                               0 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                               // on second tap, add a stop and find route between them
                               1 -> {
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                                   findRoute()
                                   Toast.makeText(
                                       applicationContext,
                                       "Calculating route.",
                                       Toast.LENGTH_SHORT
                                   ).show()
                               }
                               // on a further tap, clear and add a new first stop
                               else -> {
                                   clear()
                                   addStop(Stop(mapView.screenToLocation(screenPoint)))
                               }
                           }
                           return true
                       }
                   }
   
           }
   
       }
   
   
       private fun addStop(stop: Stop) {
   
           routeStops.add(stop)
   
           // create a blue circle symbol for the stop
           val stopMarker = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.BLUE, 20f)
           // get the stop's geometry
           val routeStopGeometry = stop.geometry
           // add graphic to graphics overlay
           graphicsOverlay.graphics.add(Graphic(routeStopGeometry, stopMarker))
   
       }
   
   
       private fun findRoute() {
   
           val routeTask = RouteTask(
               this,
               "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
           )
   
           val routeParametersFuture = routeTask.createDefaultParametersAsync()
           routeParametersFuture.addDoneListener {
               try {
                   val routeParameters = routeParametersFuture.get().apply {
                       isReturnDirections = true
                       setStops(routeStops)
                   }
   
                   // get the route and display it
                   val routeResultFuture = routeTask.solveRouteAsync(routeParameters)
                   routeResultFuture.addDoneListener {
                       try {
   
                           val result = routeResultFuture.get()
                           val routes = result.routes
                           if (routes.isNotEmpty()) {
                               val route = routes[0]
   
                               val shape = route.routeGeometry
                               val routeGraphic = Graphic(
                                   shape,
                                   SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 2f)
                               )
                               graphicsOverlay.graphics.add(routeGraphic)
   
                               // get the direction text for each maneuver and display it as a list in the UI
                               directionsList.clear()
                               route.directionManeuvers.forEach { directionsList.add(it.directionText) }
                               arrayAdapter.notifyDataSetChanged()
   
                           }
   
                       } catch (e: Exception) {
                           val error = "Error solving route: " + e.message
                           Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                           Log.e(MainActivity::class.simpleName, error)
                       }
                   }
   
               } catch (e: Exception) {
                   val error = "Error creating default route parameters: " + e.message
                   Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                   Log.e(MainActivity::class.simpleName, error)
               }
           }
   
       }
   
   
       private fun clear() {
           routeStops.clear()
           graphicsOverlay.graphics.clear()
           directionsList.clear()
           directionsList.add("Tap to add two points to the map to find a route between them.")
           arrayAdapter.notifyDataSetChanged()
       }
   
   }
   

   Show more lines

3. Create a SimpleMarkerSymbol and use the stop's Geometry to create a new Graphic and add it to the graphicsOverlay.

   MainActivity.kt

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