Find places | ArcGIS Maps SDK for Kotlin

Learn how to search for places of interest, such as hotels, cafes, and gas stations using the geocoding service A geocoding service is a service that can search for addresses, place addresses, businesses, reverse geocode coordinates to addresses, provide suggestions for places, and perform bulk geocoding. It is hosted by Esri as the ArcGIS Geocoding service and can also be hosted in ArcGIS Enterprise. Learn more .

find places

Geocoding Geocoding is the process of converting text for an address or place to a complete address with a location. Learn more is the process of transforming an address or place name to a location on the earth’s surface. A geocoding service A geocoding service is a service that can search for addresses, place addresses, businesses, reverse geocode coordinates to addresses, provide suggestions for places, and perform bulk geocoding. It is hosted by Esri as the ArcGIS Geocoding service and can also be hosted in ArcGIS Enterprise. Learn more allows you to quickly find places that meet specific criteria.

In this tutorial, you use a picklist in the user interface to select a category of places, for example, coffee shops or gas stations. You locate all the places that match this category by accessing a geocoding service. The places are displayed on the map so that you can click on them to get further information.

Prerequisites

Before starting this tutorial, you need the following:

An ArcGIS Location Platform or ArcGIS Online account.
A development and deployment environment that meets the system requirements.
An IDE for Android development in Kotlin.

Set up authentication

To access the secure ArcGIS location services ArcGIS Location Services, also referred to as Location Services, are services hosted by Esri that provide geospatial functionality for developing mapping applications. They include the ArcGIS Basemap Styles service, ArcGIS Static Basemap Tiles service, ArcGIS Places service, ArcGIS Geocoding service, ArcGIS Routing service, ArcGIS GeoEnrichment service, and ArcGIS Elevation service. An ArcGIS Location Platform or ArcGIS Online account is required to use the services. Learn more used in this tutorial, you must implement API key authentication API key authentication is a type of authentication that uses an API key to authenticate requests to ArcGIS services and secure portal items. Learn more or user authentication User authentication is a type of authentication that allows users with an ArcGIS account to sign into an application and allow it to access ArcGIS content, services, and resources on their behalf. The typical authorization protocol used is OAuth2.0. Learn more using an ArcGIS Location Platform An ArcGIS Location Platform account, formerly known as an ArcGIS Developer account, is an identity associated with an ArcGIS Location Platform subscription. Learn more or an ArcGIS Online An ArcGIS Online account, also known as an ArcGIS Organization account, is an identity associated with an ArcGIS Online subscription. It can be used to access ArcGIS tools and develop applications with ArcGIS location services for an organization. Learn more account.

You can implement API key authentication or user authentication in this tutorial. Compare the differences below:

API key authentication API key authentication is a type of authentication that uses an API key to authenticate requests to ArcGIS services and secure portal items. Learn more

Users are not required to sign in.
Requires creating an API key credential API key credentials are an item that contains the parameters used to create and manage long-lived access tokens for API key authentication. They are a type of developer credential. Learn more with the correct privileges.
API keys An API key is a long-lived access token created using API key credentials. They are valid for up to one year and are typically embedded directly into client applications. Learn more are long-lived access tokens.
Service usage is billed to the API key owner/developer.
Simplest authentication method to implement.
Recommended approach for new ArcGIS developers.

Learn more in API key authentication.

User authentication User authentication is a type of authentication that allows users with an ArcGIS account to sign into an application and allow it to access ArcGIS content, services, and resources on their behalf. The typical authorization protocol used is OAuth2.0. Learn more

Users are required to sign in with an ArcGIS account An ArcGIS account is an identity with a user type and set of privileges that can access specific ArcGIS products, tools, APIs, services, and resources. The main account types that can be used for development are an ArcGIS Location Platform account, ArcGIS Online account, and ArcGIS Enterprise account. ArcGIS Location Platform and ArcGIS Online accounts are also associated with a subscription. Learn more .
User accounts must have privilege Privileges are a set of permissions assigned to ArcGIS accounts, developer credentials, and applications that grant access to secure resources and functionality in ArcGIS. Learn more to access the ArcGIS services A service, also known as an ArcGIS service, is software that supports an ArcGIS REST API and provides geospatial functionality or data. A service can be hosted by Esri or in ArcGIS Enterprise. Learn more used in application.
Requires creating OAuth credentials OAuth credentials are an item that contains parameters required to implement user authentication or app authentication, including a client_id, client_secret, and redirect URIs. They are a type of developer credential. Learn more .
Application uses a redirect URL and client ID.
Service usage is billed to the organization of the user signed into the application.

Learn more in User authentication.

To complete this tutorial, click on the tab in the switcher below for your authentication type of choice, either API key authentication or User authentication.

Create a new API key access token An access token is an authorization string that provides access to secure ArcGIS content, data, and services. Its capabilities are determined by the privileges it supports. It is obtained by implementing API key authentication, User authentication, or App authentication. Learn more with privileges Privileges are a set of permissions assigned to ArcGIS accounts, developer credentials, and applications that grant access to secure resources and functionality in ArcGIS. Learn more to access the secure resources used in this tutorial.

Complete the Create an API key tutorial and create an API key with the following privilege(s) Privileges are a set of permissions assigned to ArcGIS accounts, developer credentials, and applications that grant access to secure resources and functionality in ArcGIS. Learn more :
- Privileges
  - Location services > Basemaps
  - Location services > Geocoding
Copy and paste the API key access token into a safe location. It will be used in a later step.

Create new OAuth credentials to access the secure resources used in this tutorial.

Complete the Create OAuth credentials for user authentication tutorial to obtain a Client ID and Redirect URL.

A Client ID uniquely identifies your app on the authenticating server. If the server cannot find an app with the provided Client ID, it will not proceed with authentication.
The Redirect URL (also referred to as a callback url) is used to identify a response from the authenticating server when the system returns control back to your app after an OAuth login. Since it does not necessarily represent a valid endpoint that a user could navigate to, the redirect URL can use a custom scheme, such as my-app://auth. It is important to make sure the redirect URL used in your app’s code matches a redirect URL configured on the authenticating server.
Copy and paste the Client ID and Redirect URL into a safe location. They will be used in a later step.

All users that access this application need account privileges Privileges are a set of permissions assigned to ArcGIS accounts, developer credentials, and applications that grant access to secure resources and functionality in ArcGIS. Learn more to access the ArcGIS Basemap Styles service The ArcGIS Basemap Styles service, also referred to as the Basemap Styles service, is a location service that provides basemap styles and data for the world. It returns styles as Mapbox styles and web maps, and data as vector tiles and/or map tiles. It supports all of the styles in the ArcGIS Basemap style and Open Basemap style family. An ArcGIS Location Platform or ArcGIS Online account is required to use the service. Learn more and the ArcGIS Geocoding service A geocoding service is a service that can search for addresses, place addresses, businesses, reverse geocode coordinates to addresses, provide suggestions for places, and perform bulk geocoding. It is hosted by Esri as the ArcGIS Geocoding service and can also be hosted in ArcGIS Enterprise. Learn more .

Develop or download

You have two options for completing this tutorial:

Option 1: Develop the code or
Option 2: Download the completed solution

Option 1: Develop the code

Open an Android Studio project

Open the project you created by completing the Display a map tutorial.
Continue with the following instructions to search for places of interest, such as hotels, cafes, and gas stations using the ArcGIS Geocoding service A geocoding service is a service that can search for addresses, place addresses, businesses, reverse geocode coordinates to addresses, provide suggestions for places, and perform bulk geocoding. It is hosted by Esri as the ArcGIS Geocoding service and can also be hosted in ArcGIS Enterprise. Learn more .

Modify the old project for use in this new tutorial.

On your file system, delete the .idea folder, if present, at the top level of your project.
In the Android view, open app > res > values > strings.xml.

In the <string name="app_name"> element, change the text content to Find places.
strings.xml
<resources> <string name="app_name">Find places</string> </resources>

In the Android view, open Gradle Scripts > settings.gradle.kts.

Change the value of rootProject.name to “Find places”.

settings.gradle.kts

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pluginManagement {
    repositories {
        google {
            content {
                includeGroupByRegex("com\\.android.*")
                includeGroupByRegex("com\\.google.*")
                includeGroupByRegex("androidx.*")
            }
        }

        mavenCentral()
        gradlePluginPortal()
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url = uri("https://esri.jfrog.io/artifactory/arcgis") }
    }
}

rootProject.name = "Find places"
include(":app")

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

In libs.versions.toml, add a [libraries] entry for the dependency. In the module-level build.gradle.kts (app), add the dependency for the lifecycle view model.

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[versions]
arcgisMapsKotlin = "200.8.2"

# Version numbers added by Android Studio New Project Wizard
agp = "8.9.2"
kotlin = "2.1.20"
coreKtx = "1.16.0"
junit = "4.13.2"
junitVersion = "1.2.1"
espressoCore = "3.6.1"
lifecycleRuntimeKtx = "2.8.7"
activityCompose = "1.10.1"
composeBom = "2025.04.00"

# Other version numbers
compileSdk = "36"
minSdk = "28"
targetSdk = "36"
media3CommonKtx = "1.5.1"

[libraries]
arcgis-maps-kotlin = { group = "com.esri", name = "arcgis-maps-kotlin", version.ref = "arcgisMapsKotlin" }
arcgis-maps-kotlin-toolkit-bom = { group = "com.esri", name = "arcgis-maps-kotlin-toolkit-bom", version.ref = "arcgisMapsKotlin" }
arcgis-maps-kotlin-toolkit-geoview-compose = { group = "com.esri", name = "arcgis-maps-kotlin-toolkit-geoview-compose" }
arcgis-maps-kotlin-toolkit-authentication = { group = "com.esri", name = "arcgis-maps-kotlin-toolkit-authentication" }
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntimeKtx" }
androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }

androidx-lifecycle-viewmodel-compose = { group = "androidx.lifecycle", name = "lifecycle-viewmodel-compose", version.ref = "lifecycleRuntimeKtx" }
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androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
androidx-ui = { group = "androidx.compose.ui", name = "ui" }
androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
androidx-media3-common-ktx = { group = "androidx.media3", name = "media3-common-ktx", version.ref = "media3CommonKtx" }

[plugins]
android-application = { id = "com.android.application", version.ref = "agp" }
kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }

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plugins {
    alias(libs.plugins.android.application)
    alias(libs.plugins.kotlin.android)
    alias(libs.plugins.kotlin.compose)
}

android {
    namespace = "com.example.app"
    compileSdk = libs.versions.compileSdk.get().toInt()

    defaultConfig {
        applicationId = "com.example.app"
        minSdk = libs.versions.minSdk.get().toInt()
        targetSdk = libs.versions.targetSdk.get().toInt()
        versionCode = 1
        versionName = "1.0"
        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = "17"
    }
    buildFeatures {
        compose = true
    }
    packaging {
        resources {
            excludes += "/META-INF/{AL2.0,LGPL2.1}"
        }
    }
}

dependencies {

    implementation(libs.androidx.core.ktx)
    implementation(libs.androidx.lifecycle.runtime.ktx)
    implementation(libs.androidx.activity.compose)
    implementation(platform(libs.androidx.compose.bom))

    implementation(libs.androidx.lifecycle.viewmodel.compose)

    implementation(libs.androidx.ui)
    implementation(libs.androidx.ui.graphics)
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    implementation(libs.androidx.ui.tooling.preview)
    implementation(libs.androidx.material3)
    implementation(libs.androidx.media3.common.ktx)
    testImplementation(libs.junit)
    androidTestImplementation(libs.androidx.junit)
    androidTestImplementation(libs.androidx.espresso.core)
    androidTestImplementation(platform(libs.androidx.compose.bom))
    androidTestImplementation(libs.androidx.ui.test.junit4)
    debugImplementation(libs.androidx.ui.tooling)
    debugImplementation(libs.androidx.ui.test.manifest)
    // ArcGIS Maps for Kotlin - SDK dependency
    implementation(libs.arcgis.maps.kotlin)
    // Toolkit dependencies
    implementation(platform(libs.arcgis.maps.kotlin.toolkit.bom))
    implementation(libs.arcgis.maps.kotlin.toolkit.geoview.compose)
    implementation(libs.arcgis.maps.kotlin.toolkit.authentication)
}

Set developer credentials

If you implemented API key authentication API key authentication is a type of authentication that uses an API key to authenticate requests to ArcGIS services and secure portal items. Learn more in the Display a map tutorial, the API key access token will only have the Basemaps privilege. The Find places tutorial requires the Geocoding privilege to find places using the LocatorTask. To create an API Key access token that has the Basemaps and Geocoding privileges, see the Set up authentication step and then follow the instructions below.

In the Android view of Android Studio, open app > kotlin+java > com.example.app > MainActivity.
In the onCreate() lifecycle method of the MainActivity class, set the ArcGISEnvironment.apiKey property by calling ApiKey.create(). Pass in your API key access token as a string and don’t forget the double quotes. Do this before the setContent block.
MainActivity.kt
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) ArcGISEnvironment.apiKey = ApiKey.create("YOUR_ACCESS_TOKEN")

Best Practice: The access token is stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

Use the Authenticator toolkit component to manage your OAuth credentials OAuth credentials are an item that contains parameters required to implement user authentication or app authentication, including a client_id, client_secret, and redirect URIs. They are a type of developer credential. Learn more and pass it to the ArcGISEnvironment.

Open the app > kotlin+java > com.example.app > MainActivity.kt file.

Set your clientID and redirectURL values.

MainActivity.kt

        authenticatorState.oAuthUserConfigurations = listOf(
            OAuthUserConfiguration(

                portalUrl = "https://www.arcgis.com",
                clientId = "YOUR_CLIENT_ID",
                redirectUrl = "YOUR_REDIRECT_URL"

            )
        )

Best Practice: The OAuth credentials are stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

Add import statements and some Compose variables

In the Android view, open app > kotlin+java > com.example.app > screens > MainScreen.kt. Replace the import statements with the imports needed for this tutorial.

MainScreen.kt

@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

Create a view model

Modern app architecture uses a map view model to hold the business logic and the mutable state of your app.

In Android Studio: in the Android view, open app > kotlin+java > com.example.app > screens > MainScreen.kt, create a map view model that extends ViewModel.

MainScreen.kt

65 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

}
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@Composable
fun MainScreen() {

}

In the MainScreen composable, delete the entire function body. Leave just the function declaration as shown below. Then delete the top-level code for creating a map that is part of the Display a map tutorial. In this tutorial, you will create the map within the view model.

MainScreen.kt

69 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

}

@Composable
fun MainScreen() {

}

MainScreen.kt

40 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.example.app.R

@Composable
fun MainScreen() {

    val map = remember {
        createMap()
    }

    Scaffold(
        topBar = { TopAppBar(title = { Text(text = stringResource(id = R.string.app_name)) }) }
    ) {

        MapView(
            modifier = Modifier.fillMaxSize().padding(it),
            arcGISMap = map
        )

    }

}

fun createMap(): ArcGISMap {

    return ArcGISMap(BasemapStyle.ArcGISTopographic).apply {

        initialViewpoint = Viewpoint(
            latitude = 34.0270,
            longitude = -118.8050,

            scale = 72000.0

        )

    }

}

In the view model, create a map from a BasemapStyle and center the ArcGISMap.initialViewpoint on downtown Santa Monica, CA. Then create a MapViewProxy, which is defined in the ArcGIS Maps SDK for Kotlin Toolkit.

MapViewModel class

67 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()
7 collapsed lines

}

@Composable
fun MainScreen() {

}

Create a GraphicsOverlay to display graphics A graphic is a visual element composed of a geometry, symbol, and attributes that is displayed on a map or scene. Learn more that represent places of the same category, such as coffee shops.

A graphics overlay A graphics overlay is a client-side, temporary container of graphics to display on a map view or scene view. Learn more is a container for graphics A graphic is a visual element composed of a geometry, symbol, and attributes that is displayed on a map or scene. Learn more . It is used with a map view A map view is a user interface that displays map layers and graphics in 2D. It controls the area (extent) of the map that is visible and supports user interactions such as pan and zoom. Learn more to display graphics on a map A map is a collection of layers that are displayed in 2D. It is typically composed of a basemap layer and data layers. Learn more . You can add more than one graphics overlay to a map view. Graphics overlays are displayed on top of all the other layers A layer is a reference to a collection of geographic data that is used to access and display data. The data for layers are typically provided by the basemap layer service and data services. Learn more .

Then create other map view model properties as follows:

The current extent visible on the map view.
The location on the map where the user taps to obtain further information about the place represented by a graphic.
The selected geoelement A geoelement refers to any geographic element in a map or map view that can be identified by its location to return attribute information. Learn more , which is the closest geoelement to the tap location. (A graphic is a type of GeoElement.)
The current coroutine Job, so the job can be cancelled before launching a new coroutine.

MapViewModel class

65 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

}
5 collapsed lines

@Composable
fun MainScreen() {

}

Set up the LocatorTask

A locator task is used to search for places using a geocoding service. Results from this search contain the place location and additional information ( attributes Attributes are fields and values for a single feature or non-spatial record. They are typically stored in a database or service such as a feature service. Learn more ). Create the locator task along with any variables and methods needed to perform the search and display the results.

In the view model, create a LocatorTask property named locator based on the Geocoding service.

A locator task is used to convert an address to a point A point is a type of geometry containing a single set of x,y coordinates and a spatial reference. Learn more (geocode) or vice-versa ( reverse geocode Reverse geocoding is the process of converting a point to its nearest address or place. Learn more ). An address includes any type of information that distinguishes a place. A locator A locator is an ArcGIS dataset that stores address information and the rules for translating descriptions of places (such as street addresses or place names) into spatial data that can be displayed on a map. Learn more involves finding matching locations for a given address. Reverse-geocoding is the opposite and finds the closest address for a given point.

MapViewModel class

94 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")
7 collapsed lines

}

@Composable
fun MainScreen() {

}

To support the geocode operation, create an enum named Category. It should have two properties: a String named “label” and a Color named “color”. Each category is searched using its label and is distinguished on the map using its associated color.

This tutorial uses category filtering to provide accurate search results based on pre-determined place categories. Feel free to modify this list to your specific requirements.

MapViewModel class

1
    enum class Category(val label: String, val color: Color) {
2
        // CoffeeShop color is brown.
3
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
4
        // GasStation color is orange.
5
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
6
        // Food color is purple.
7
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
8
        // Hotel color is blue.
9
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
10
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
11
    }

Create a suspend function called findPlaces() to perform the geocode Geocoding is the process of converting text for an address or place to a complete address with a location. Learn more search operation. The method takes a parameter of type Category that you created in the previous step to indicate which category of places to search for.

MapViewModel class

108 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

    }
7 collapsed lines

}

@Composable
fun MainScreen() {

}

Clear the previous results by removing all graphics from the graphics overlay. Create and configure new GeocodeParameters. Populate them with the searchArea parameter (the current map view extent) and the result attribute names.

MapViewModel class

108 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

    }
7 collapsed lines

}

@Composable
fun MainScreen() {

}

Perform the search query using geocode(). Pass in the category’s label and the geocode parameters.

MapViewModel class

108 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

    }
7 collapsed lines

}

@Composable
fun MainScreen() {

}

Create graphics for each of the results and add them to the graphics overlay.

Populate the graphicsOverlay with SimpleMarkerSymbols representing each place returned in the search results. This is very similar to the Add a point, line, and polygon tutorial.

MapViewModel class

108 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }
7 collapsed lines

}

@Composable
fun MainScreen() {

}

Identify the closest geoelement to the user’s tap location

An identify Identify is a query based on a point on a map or scene that is used to find feature, graphic, or raster cell data. Learn more operation can be used to get information about a geoelement A geoelement refers to any geographic element in a map or map view that can be identified by its location to return attribute information. Learn more (such as a graphic A graphic is a visual element composed of a geometry, symbol, and attributes that is displayed on a map or scene. Learn more ) at a location where the user has tapped on the map.

Create a function called identify() that takes a SingleTapConfirmedEvent . In the function, first cancel the current identify job. Then launch a new coroutine and call MapViewProxy.identify() to identify the closest graphic(s) at the tap location.

MapViewModel class

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

Add functions to clear the selected geoelement and log errors

Add a function that clears the currently selected geoelement A geoelement refers to any geographic element in a map or map view that can be identified by its location to return attribute information. Learn more . Then add a function to log errors.

MapViewModel class

170 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }
7 collapsed lines

}

@Composable
fun MainScreen() {

}

The MainScreen composable needs some variables to hold state for a dropdown menu, a view model, and the currently selected geoelement A geoelement refers to any geographic element in a map or map view that can be identified by its location to return attribute information. Learn more . It also needs a Scaffold composable to display a dropdown menu, the map view, and a callout.

In the MainScreen composable function add the following:

A mutable state boolean to hold whether a dropdown menu, which you’ll create in a later step, is expanded.
An instance of your MapViewModel class, using the Jetpack Compose viewModel() function.
A selectedGeoElement variable that collects the mapViewModel.selectedGeoElement, which was defined as a StateFlow<GeoElement>.

MainScreen()

180 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

}

Add a Scaffold that has a top bar. Add an empty content lambda to the Scaffold. That lambda is where you will add MapView in a later step.

MainScreen()

180 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

            ) }
    ) {

    }

}

Add an actions lambda as a parameter to the TopAppBar. The lambda will first display a More options icon (the three vertical dots), which the user taps to display a dropdown menu of place categories.

MainScreen()

180 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

                actions = {

                    IconButton(onClick = { isDropdownExpanded = !isDropdownExpanded }) {
                        Icon(
                            imageVector = Icons.Default.MoreVert,
                            contentDescription = "More options"
                        )
                    }

                }

            ) }
    ) {

    }

}

The actions lambda then defines a DropdownMenu that has a DropdownMenuItem for each of the categories you created in the map view model.

MainScreen()

180 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

                actions = {

                    IconButton(onClick = { isDropdownExpanded = !isDropdownExpanded }) {
                        Icon(
                            imageVector = Icons.Default.MoreVert,
                            contentDescription = "More options"
                        )
                    }

                    DropdownMenu(
                        expanded = isDropdownExpanded,
                        onDismissRequest = { isDropdownExpanded = false }
                    ) {
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.CoffeeShop)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.CoffeeShop.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.GasStation)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.GasStation.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Food)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Food.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Hotel)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Hotel.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.ParksOutdoors)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.ParksOutdoors.label) }
                        )
                    }

                }

            ) }
    ) {

    }

}

Add `MapView` to display the map and interact with the map view model

Add the MapView composable and pass the parameters that do the following:

Display the current extent of the map when the extent (visible area) changes.
Define a MapViewProxy
Attach the graphics overlay to display the graphics that represent places matching the category selected in the dropdown menu.

Call the identify() function when the user taps on the map. You created this function in the map view model.

MapView()

264 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

                actions = {

                    IconButton(onClick = { isDropdownExpanded = !isDropdownExpanded }) {
                        Icon(
                            imageVector = Icons.Default.MoreVert,
                            contentDescription = "More options"
                        )
                    }

                    DropdownMenu(
                        expanded = isDropdownExpanded,
                        onDismissRequest = { isDropdownExpanded = false }
                    ) {
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.CoffeeShop)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.CoffeeShop.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.GasStation)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.GasStation.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Food)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Food.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Hotel)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Hotel.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.ParksOutdoors)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.ParksOutdoors.label) }
                        )
                    }

                }

            ) }
    ) {

        MapView(modifier = Modifier
            .fillMaxSize()
            .padding(it),
            arcGISMap = mapViewModel.map,

            onVisibleAreaChanged = { newVisibleArea ->
                mapViewModel.geoViewExtent = newVisibleArea.extent
            },
            mapViewProxy = mapViewModel.mapViewProxy,
            graphicsOverlays = listOf(mapViewModel.graphicsOverlay),
            onSingleTapConfirmed = { singleTapConfirmedEvent ->
                mapViewModel.identify(singleTapConfirmedEvent)
            },

        )
4 collapsed lines

    }

}

Define `CalloutContent` to display name and address for the found place

When a user taps on a graphic, a callout displays showing the name and address of the geoelement A geoelement refers to any geographic element in a map or map view that can be identified by its location to return attribute information. Learn more closest to the tapped location on the map.

Define a composable function named CalloutContent that displays the name of the place in larger font size and the address of the place in a smaller size.

CalloutContent()

284 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

                actions = {

                    IconButton(onClick = { isDropdownExpanded = !isDropdownExpanded }) {
                        Icon(
                            imageVector = Icons.Default.MoreVert,
                            contentDescription = "More options"
                        )
                    }

                    DropdownMenu(
                        expanded = isDropdownExpanded,
                        onDismissRequest = { isDropdownExpanded = false }
                    ) {
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.CoffeeShop)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.CoffeeShop.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.GasStation)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.GasStation.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Food)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Food.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Hotel)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Hotel.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.ParksOutdoors)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.ParksOutdoors.label) }
                        )
                    }

                }

            ) }
    ) {

        MapView(modifier = Modifier
            .fillMaxSize()
            .padding(it),
            arcGISMap = mapViewModel.map,

            onVisibleAreaChanged = { newVisibleArea ->
                mapViewModel.geoViewExtent = newVisibleArea.extent
            },
            mapViewProxy = mapViewModel.mapViewProxy,
            graphicsOverlays = listOf(mapViewModel.graphicsOverlay),
            onSingleTapConfirmed = { singleTapConfirmedEvent ->
                mapViewModel.identify(singleTapConfirmedEvent)
            },

        )

    }

}

/**
 * Content for the Callout to display information on the tapped graphics overlay and its [selectedElementAttributes]
 */
@Composable
fun CalloutContent(
    selectedElementAttributes: Map<String, Any?>
) {
    LazyColumn(contentPadding = PaddingValues(8.dp)) {
        selectedElementAttributes.forEach { attribute ->
            item {
                val style = if (attribute.key == "PlaceName") {
                    MaterialTheme.typography.titleLarge
                } else {
                    MaterialTheme.typography.bodyMedium
                }

                Text(
                    text = "${attribute.value}",
                    fontStyle = FontStyle.Normal,
                    style = style,
                    textAlign = TextAlign.Start
                )

            }
        }
    }
}

Display information for the found place

The MapView needs one more parameter so the callout content displays on top of the map view.

Go back to MapView in your code and add the content parameter, which is a lambda that calls the Callout composable defined in the ArcGIS Maps SDK for Kotlin Toolkit. The Callout function has its own content lambda parameter, which in turn calls your CalloutContent function with the attributes (Place_addr, PlaceName) you specified in the map view model .

The Modifier passed to Callout calls size functions that restrict the display size of the callout: wrapContentSize(), height(), widthIn().

MapView()

264 collapsed lines
@file:OptIn(ExperimentalMaterial3Api::class)

package com.example.app.screens

import android.app.Application
import android.util.Log
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.GeoElement
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.mapping.view.SingleTapConfirmedEvent
import com.arcgismaps.tasks.geocode.GeocodeParameters
import com.arcgismaps.tasks.geocode.LocatorTask
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.example.app.R
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MapViewModel() : ViewModel() {

    // Create a map using the basemap style ArcGISTopographic.
    val map = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(
            center = Point(
                x = -118.477324,
                y = 33.999390,
                spatialReference = SpatialReference.wgs84()
            ),
            scale = 72_000.0
        )
    }
    val mapViewProxy = MapViewProxy()

    val graphicsOverlay = GraphicsOverlay()
    // The current extent visible in the map view.
    lateinit var geoViewExtent: Envelope

    // The location on the map that the user tapped to obtain further information. (A graphic is a type of GeoElement).
    private val _tapLocation = MutableStateFlow<Point?>(null)
    val tapLocation: StateFlow<Point?> = _tapLocation.asStateFlow()

    // The geoelement closest to the location that the user tapped.
    private val _selectedGeoElement = MutableStateFlow<GeoElement?>(null)
    val selectedGeoElement: StateFlow<GeoElement?> = _selectedGeoElement.asStateFlow()

    private var currentIdentifyJob: Job? = null

    val locator = LocatorTask(uri = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")

    enum class Category(val label: String, val color: Color) {
        // CoffeeShop color is brown.
        CoffeeShop(label = "Coffee shop", color = Color.fromRgba(r =150, g = 75, b= 0, a = 255)),
        // GasStation color is orange.
        GasStation(label = "Gas station", color = Color.fromRgba(r = 255, g = 165, b = 0, a =255)),
        // Food color is purple.
        Food(label = "Food", color = Color.fromRgba(r = 160, g = 32, b = 240, a = 255)),
        // Hotel color is blue.
        Hotel(label = "Hotel", color = Color.fromRgba(r = 0, g = 0, b = 255, a = 255)),
        ParksOutdoors(label = "Parks and Outdoors", Color.green)
    }

    suspend fun findPlaces(category: Category) {

        graphicsOverlay.graphics.clear()

        val geocodeParameters = GeocodeParameters().apply {
            searchArea = geoViewExtent
            resultAttributeNames.addAll(listOf("Place_addr", "PlaceName"))
        }

        val geocodeResultsList = locator.geocode(
            searchText = category.label,
            parameters = geocodeParameters
        ).getOrElse { error ->
            return logError(error)
        }

        if (geocodeResultsList.isNotEmpty()) {
            val placeSymbol = SimpleMarkerSymbol(
                style = SimpleMarkerSymbolStyle.Circle,
                color = category.color,
                size = 10f
            ).apply {
                outline = SimpleLineSymbol(
                    style = SimpleLineSymbolStyle.Solid,
                    color = Color.white,
                    width = 2f
                )
            }
            val graphics = geocodeResultsList.map { geocodeResult ->
                Graphic(
                    geometry = geocodeResult.displayLocation,
                    attributes = geocodeResult.attributes,
                    symbol = placeSymbol
                )
            }
            graphicsOverlay.graphics.addAll(graphics)
        }

    }

    /**
     * Identifies the tapped screen coordinate in the provided [singleTapConfirmedEvent]. The
     * identified geoelement is set to [_selectedGeoElement].
     *
     * @since 200.5.0
     */
    fun identify(singleTapConfirmedEvent: SingleTapConfirmedEvent) {
        currentIdentifyJob?.cancel()
        currentIdentifyJob = viewModelScope.launch {
            val result = mapViewProxy.identify(
                graphicsOverlay = graphicsOverlay,
                screenCoordinate = singleTapConfirmedEvent.screenCoordinate,
                tolerance = 2.dp
            )
            result.onSuccess { identifyGraphicsOverlayResult ->
                _selectedGeoElement.value = identifyGraphicsOverlayResult.geoElements.firstOrNull()
            }.onFailure { error ->
                logError(error)
            }
        }
    }

    fun clearSelectedGeoElement() {
        _selectedGeoElement.value = null
    }

    private fun logError(error: Throwable) {
        Log.e(this.javaClass.simpleName, error.message.toString(), error.cause)
    }

}

@Composable
fun MainScreen() {

    var isDropdownExpanded by remember { mutableStateOf(false) }

    // Create a ViewModel to handle MapView interactions.
    val mapViewModel: MapViewModel = viewModel()
    val selectedGeoElement = mapViewModel.selectedGeoElement.collectAsState().value

    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = stringResource(id = R.string.app_name)) },

                actions = {

                    IconButton(onClick = { isDropdownExpanded = !isDropdownExpanded }) {
                        Icon(
                            imageVector = Icons.Default.MoreVert,
                            contentDescription = "More options"
                        )
                    }

                    DropdownMenu(
                        expanded = isDropdownExpanded,
                        onDismissRequest = { isDropdownExpanded = false }
                    ) {
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.CoffeeShop)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.CoffeeShop.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.GasStation)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.GasStation.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Food)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Food.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.Hotel)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.Hotel.label) }
                        )
                        DropdownMenuItem(
                            onClick = {
                                mapViewModel.clearSelectedGeoElement()
                                mapViewModel.viewModelScope.launch {
                                    mapViewModel.findPlaces(category = MapViewModel.Category.ParksOutdoors)
                                    isDropdownExpanded = false
                                }
                            },
                            text = { Text(MapViewModel.Category.ParksOutdoors.label) }
                        )
                    }

                }

            ) }
    ) {

        MapView(modifier = Modifier
            .fillMaxSize()
            .padding(it),
            arcGISMap = mapViewModel.map,

            onVisibleAreaChanged = { newVisibleArea ->
                mapViewModel.geoViewExtent = newVisibleArea.extent
            },
            mapViewProxy = mapViewModel.mapViewProxy,
            graphicsOverlays = listOf(mapViewModel.graphicsOverlay),
            onSingleTapConfirmed = { singleTapConfirmedEvent ->
                mapViewModel.identify(singleTapConfirmedEvent)
            },

            content = if (selectedGeoElement != null) {

                {
                    Callout(
                        modifier = Modifier
                            .wrapContentSize()
                            .height(120.dp)
                            .widthIn(max = 300.dp),
                        geoElement = selectedGeoElement,
                        tapLocation = mapViewModel.tapLocation.value
                    ) {
                        CalloutContent(
                            selectedElementAttributes = selectedGeoElement.attributes
                        )
                    }
                }
            } else {
                null
            }

        )
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    }

}

/**
 * Content for the Callout to display information on the tapped graphics overlay and its [selectedElementAttributes]
 */
@Composable
fun CalloutContent(
    selectedElementAttributes: Map<String, Any?>
) {
    LazyColumn(contentPadding = PaddingValues(8.dp)) {
        selectedElementAttributes.forEach { attribute ->
            item {
                val style = if (attribute.key == "PlaceName") {
                    MaterialTheme.typography.titleLarge
                } else {
                    MaterialTheme.typography.bodyMedium
                }

                Text(
                    text = "${attribute.value}",
                    fontStyle = FontStyle.Normal,
                    style = style,
                    textAlign = TextAlign.Start
                )

            }
        }
    }
}

Click Run > Run > app to run the app.

When the app opens, tap the More options icon in the upper right and select a place category. Then tap one of the places and see its name and address. If you zoom or pan to another area, tap the More options icon again and select a category to display places in the new extent.

Alternatively, you can download the tutorial solution, as follows.

Option 2: Download the solution

Click the Download solution link in the right-hand side of this page.
Unzip the file to a location on your machine.
Run Android Studio.
Go to File > Open…. Navigate to the solution folder and click Open.

On Windows: If you are in the Welcome to Android Studio dialog, click Open and navigate to the solution folder. Then click Open.

Since the downloaded solution does not contain authentication credentials, you must add the developer credentials that you created in the Set up authentication section.

Set developer credentials in the solution

To allow your app users to access ArcGIS location services ArcGIS Location Services, also referred to as Location Services, are services hosted by Esri that provide geospatial functionality for developing mapping applications. They include the ArcGIS Basemap Styles service, ArcGIS Static Basemap Tiles service, ArcGIS Places service, ArcGIS Geocoding service, ArcGIS Routing service, ArcGIS GeoEnrichment service, and ArcGIS Elevation service. An ArcGIS Location Platform or ArcGIS Online account is required to use the services. Learn more , use the developer credentials that you created in the Set up authentication step to authenticate requests for resources.

In the Android view of Android Studio, open app > kotlin+java > com.example.app > MainActivity. Set the AuthenticationMode to .API_KEY.

MainActivity.kt

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package com.example.app

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.httpcore.authentication.OAuthUserConfiguration
import com.arcgismaps.toolkit.authentication.AuthenticatorState
import com.arcgismaps.toolkit.authentication.DialogAuthenticator
import com.example.app.screens.MainScreen
import com.example.app.ui.theme.TutorialTheme

class MainActivity : ComponentActivity() {

    private enum class AuthenticationMode { API_KEY, USER_AUTH }

    private val authenticationMode = AuthenticationMode.API_KEY
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    private val authenticatorState = AuthenticatorState()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        when (authenticationMode) {
            AuthenticationMode.API_KEY -> {

                ArcGISEnvironment.apiKey = ApiKey.create("YOUR_ACCESS_TOKEN")

            }

            AuthenticationMode.USER_AUTH -> {
                authenticatorState.oAuthUserConfigurations = listOf(
                    OAuthUserConfiguration(
                        portalUrl = "https://www.arcgis.com",

                        clientId = "YOUR_CLIENT_ID",
                        redirectUrl = "YOUR_REDIRECT_URL"

                    )
                )

            }
        }

        enableEdgeToEdge()

        setContent {
            TutorialTheme {
                MainScreen()

                if (authenticationMode == AuthenticationMode.USER_AUTH) {
                    DialogAuthenticator(authenticatorState)
                }

            }
        }
    }

}

Set the apiKey property with your API key access token.

MainActivity.kt

22 collapsed lines
package com.example.app

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.httpcore.authentication.OAuthUserConfiguration
import com.arcgismaps.toolkit.authentication.AuthenticatorState
import com.arcgismaps.toolkit.authentication.DialogAuthenticator
import com.example.app.screens.MainScreen
import com.example.app.ui.theme.TutorialTheme

class MainActivity : ComponentActivity() {

    private enum class AuthenticationMode { API_KEY, USER_AUTH }

    private val authenticationMode = AuthenticationMode.API_KEY

    private val authenticatorState = AuthenticatorState()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        when (authenticationMode) {
            AuthenticationMode.API_KEY -> {

                ArcGISEnvironment.apiKey = ApiKey.create("YOUR_ACCESS_TOKEN")

            }
30 collapsed lines

            AuthenticationMode.USER_AUTH -> {
                authenticatorState.oAuthUserConfigurations = listOf(
                    OAuthUserConfiguration(
                        portalUrl = "https://www.arcgis.com",

                        clientId = "YOUR_CLIENT_ID",
                        redirectUrl = "YOUR_REDIRECT_URL"

                    )
                )

            }
        }

        enableEdgeToEdge()

        setContent {
            TutorialTheme {
                MainScreen()

                if (authenticationMode == AuthenticationMode.USER_AUTH) {
                    DialogAuthenticator(authenticatorState)
                }

            }
        }
    }

}

Best Practice: The access token is stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

In the Android view of Android Studio, open app > kotlin+java > com.example.app > MainActivity. Set the AuthenticationMode to .USER_AUTH.

MainActivity.kt

class MainActivity : ComponentActivity() {
    private enum class AuthenticationMode { API_KEY, USER_AUTH }

    private val authenticationMode = AuthenticationMode.USER_AUTH

Set your clientID and redirectURL values. You must use the RedirectURL that you supplied for your app in the user authentication part of the Set up authentication step.

MainActivity.kt

            AuthenticationMode.USER_AUTH -> {
                authenticatorState.oAuthUserConfigurations = listOf(
                    OAuthUserConfiguration(
                        portalUrl = "https://www.arcgis.com",

                        clientId = "YOUR_CLIENT_ID",
                        redirectUrl = "YOUR_REDIRECT_URL"

                    )
                )

Open app > manifests > AndroidManifest.xml.

Set the android:scheme and android:host using the scheme and host from your RedirectURL.

A redirectURL is composed of a scheme and a host component. The format for the redirect url is scheme://host. For example, if the redirect url is myscheme://myhost then the scheme is myscheme and the host is myhost.

AndroidManifest.xml

41 collapsed lines
<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-permission android:name="android.permission.INTERNET" />

    <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.Tutorial"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:theme="@style/Theme.Tutorial">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

        </activity>

        <activity
            android:name="com.arcgismaps.toolkit.authentication.AuthenticationActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
            android:exported="true"
            android:launchMode="singleTop" >
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:scheme="your_redirect_url_scheme"
                    android:host="your_redirect_url_host" />
6 collapsed lines

            </intent-filter>
        </activity>

    </application>
</manifest>

Best Practice: The OAuth credentials are stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

Run the app

Click Run > Run > app to run the app.

What’s next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

TutorialsSearch for an address NextRoute and directions

Prerequisites

Set up authentication

Develop or download

Option 1: Develop the code

Open an Android Studio project

Set developer credentials

Add import statements and some Compose variables

Create a view model

Set up the LocatorTask

Identify the closest geoelement to the user’s tap location

Add functions to clear the selected geoelement and log errors

Add a Scaffold with a top bar and a dropdown menu

Add MapView to display the map and interact with the map view model

Define CalloutContent to display name and address for the found place

Display information for the found place

Option 2: Download the solution

Set developer credentials in the solution

Run the app

What’s next?

Add `MapView` to display the map and interact with the map view model

Define `CalloutContent` to display name and address for the found place