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 The following are required for this tutorial:
An ArcGIS account to access API keys . If you don't have an account, sign up for free . Confirm that your system meets the system requirements . An IDE for Android development in Kotlin. Steps Open an Android Studio project To start this tutorial, complete the Display a map tutorial. Or download and unzip the Display a map solution in a new folder.
Modify the old project for use in this new tutorial. Expand More info for instructions.
More info On your file system, delete the .idea folder, if present, at the top level of your project.
In the Android tool window, open app > res > values > strings.xml .
In the <string name="app_ name">
element, change the text content to Find a route and directions .
strings.xml
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< resources >
< string name = "app_name" > Find a route and directions </ string >
</ resources >
In the Android tool window, open Gradle Scripts > settings.gradle .
Change the value of root Project.name
to Find a route and directions .
settings.gradle
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rootProject.name = "Find a route and directions"
include ':app'
Click File > Sync Project with Gradle files . Android Studio will recognize your changes and create a new .idea folder.
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 .
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.
In Android Studio: in the Android tool window, open app > java > com.example.app > MainActivity .
In the set A p i K e y F o r App()
method, find the ArcGISRuntime Environment.set A p i Key("YOUR_ API_ KEY")
call and paste your API key inside the quotes, replacing YOUR_API_KEY .
MainActivity.kt
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override fun onDestroy () {
mapView.dispose()
super .onDestroy()
}
private fun setApiKeyForApp () {
// 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" )
}
Add import statements and class properties Modify import statements to reference the packages and classes required for this tutorial. Then add properties to the class that are used in multiple functions within this tutorial.
Replace app-specific import statements with the imports needed for this tutorial.
MainActivity.kt
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package com.example.app
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import android.R.layout
import android.graphics.Color
import android.util.Log
import android.view.MotionEvent
import android.widget.ArrayAdapter
import android.widget.ListView
import android.widget.Toast
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 kotlin.math.roundToInt
import com.example.app.databinding.ActivityMainBinding
Within the Main Activity
class, add the following class properties.
MainActivity.kt
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Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line. Add line.
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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)
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 Graphics Overlay
.
In the setup Map()
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
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// set up your map here. You will call this method from onCreate()
private fun setupMap () {
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 ))
}
}
Add the graphics Overlay
to the map View
. 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
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mapView.apply {
// set the map on the map view
this .map = map
setViewpoint(Viewpoint( 34.0539 , - 118.2453 , 144447.638572 ))
graphicsOverlays.add(graphicsOverlay)
}
Add a List View
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.
In the activity_ main.xml
file, create an AndroidList View
which will display a vertical list of directions.
activity_main.xml
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< ListView
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override fun onCreate (savedInstanceState: Bundle ?) {
super .onCreate(savedInstanceState)
setContentView(activityMainBinding.root)
listView.adapter = arrayAdapter
setApiKeyForApp()
setupMap()
}
Create an add Stop
function A Route Task
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.
More info When a user taps on the map, a stop will be added to a list of route stops. In this tutorial, the first tap will create the origin stop and the second will create the destination stop.
Create an add Stop(stop)
function.
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private fun addStop (stop: Stop ) {
}
Add the stop
to the Mutable List< Stop>
named route Stops
.
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private fun addStop (stop: Stop ) {
routeStops.add(stop)
}
Create a Simple Marker Symbol
and use the stop
's Geometry
to create a new Graphic
and add it to the graphics Overlay
.
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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))
}
Create a find Route
function A route task makes a request to a service and returns the results. Solve the route between the origin and destination stops using a Route Task
, which accesses a routing service . A routing service with global coverage is part of ArcGIS location services. You can also publish custom routing services using ArcGIS Enterprise.
Create a find Route()
function.
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private fun findRoute () {
}
Create a Route Task
with a string URL to reference the routing service .
MainActivity.kt
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private fun findRoute () {
val routeTask = RouteTask(
this ,
"https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World"
)
}
Get default Route Parameters
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and set the return directions property to true
. This specifies that the route results should include turn-by-turn directions. Also, set the route Stops
list to the route Parameters
with set Stops(route Stops)
.
MainActivity.kt
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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)
}
} 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)
}
}
}
To find the route between the origin and destination stops, solve the route using the Route Task
with the route Parameters
.
MainActivity.kt
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