Show device location | ArcGIS Maps SDK for Kotlin

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Sample viewer app

Show your current position on the map, as well as switch between different types of auto pan modes.

Image of show device location

Use case

When using a map within a GIS, it may be helpful for a user to know their own location within a map, whether that’s to aid the user’s navigation or to provide an easy means of identifying/collecting geospatial information at their location.

How to use the sample

On the lower left, there is a switch that allows you to turn location tracking On and Off.

Tap the button in the lower right (which starts in Re-Center mode). A menu will appear with the following options:

Re-Center - Starts the location display with LocationDisplayAutoPanMode set to Recenter.
Navigation - Starts the location display with LocationDisplayAutoPanMode set to Navigation.
Compass - Starts the location display with LocationDisplayAutoPanMode set to CompassNavigation.

How it works

Add the composable MapView to your UI.
Get a LocationDisplay object by calling rememberLocationDisplay() and set it to the composable MapView.
Use start() and stop() on the LocationDisplay.dataSource as necessary.

Relevant API

ArcGISMap
LocationDisplay
LocationDisplay.AutoPanMode
MapView

Additional information

Location permissions are required for this sample.

This sample demonstrates the following AutoPanMode options:

Recenter: In this mode, the MapView attempts to keep the location symbol on-screen by re-centering the location symbol when the symbol moves outside a “wander extent”. The location symbol may move freely within the wander extent, but as soon as the symbol exits the wander extent, the MapView re-centers the map on the symbol.
Navigation: This mode is best suited for in-vehicle navigation.
CompassNavigation: This mode is better suited for waypoint navigation when the user is walking.

This sample uses the GeoView-Compose Toolkit module to be able to implement a composable MapView.

Sample Code

MainActivity.kt

ShowDeviceLocationViewModel.kt

ShowDeviceLocationScreen.kt

/* Copyright 2025 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgismaps.sample.showdevicelocation

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.showdevicelocation.screens.ShowDeviceLocationScreen

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.ACCESS_TOKEN)

        enableEdgeToEdge()
        setContent {
            SampleAppTheme {
                ShowDeviceLocationApp()
            }
        }
    }

    @Composable
    private fun ShowDeviceLocationApp() {
        Surface(color = MaterialTheme.colorScheme.background) {
            ShowDeviceLocationScreen(
                sampleName = getString(R.string.show_device_location_app_name)
            )
        }
    }
}

/* Copyright 2025 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgismaps.sample.showdevicelocation.components

import android.app.Application
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.location.LocationDisplayAutoPanMode
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.view.LocationDisplay
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import com.esri.arcgismaps.sample.showdevicelocation.R
import kotlinx.coroutines.launch

class ShowDeviceLocationViewModel(app: Application) : AndroidViewModel(app) {

    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISNavigationNight)

    // Create a message dialog view model for handling error messages
    val messageDialogVM = MessageDialogViewModel()

    init {
        viewModelScope.launch {
            arcGISMap.load().onFailure { messageDialogVM.showMessageDialog(it) }
        }
    }

    // available options in dropdown menu
    val dropDownMenuOptions = arrayListOf(
        ItemData("Re-center", R.drawable.locationdisplayrecenter),
        ItemData("Navigation", R.drawable.locationdisplaynavigation),
        ItemData("Compass", R.drawable.locationdisplayheading)
    )

    // This variable holds the currently selected item from the dropdown menu
    var selectedItem by mutableStateOf(dropDownMenuOptions[0])
        private set


    // This function handles the selection of an item from the dropdown menu
    fun onItemSelected(item: ItemData, locationDisplay: LocationDisplay){
        selectedItem = item
        when (item.text) {
            "Re-center" -> {
                // re-center MapView on location
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.Recenter)
            }
            "Navigation" -> {
                // start navigation mode
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.Navigation)
            }
            "Compass" -> {
                // start compass navigation mode
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.CompassNavigation)
            }
        }
    }

    // variable to track if location tracking is enabled
    var isLocationTrackingEnabled by mutableStateOf(true)
        private set

    // function to toggle location tracking based on the switch state
    fun toggleLocationTracking(newValue: Boolean, locationDisplay: LocationDisplay){
        isLocationTrackingEnabled = newValue
        if(isLocationTrackingEnabled) {
            viewModelScope.launch {
                locationDisplay.dataSource.start()
            }
        } else {
            viewModelScope.launch {
                locationDisplay.dataSource.stop()
            }
        }
    }
}

/** Represents an option from dropdown menu */
@Stable
data class ItemData(val text: String, val imageId: Int)

/* Copyright 2025 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgismaps.sample.showdevicelocation.screens

import android.Manifest
import android.content.Context
import android.widget.Toast
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.Image
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.DropdownMenu
import androidx.compose.material3.DropdownMenuItem
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.arcgismaps.ArcGISEnvironment
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.arcgismaps.toolkit.geoviewcompose.rememberLocationDisplay
import com.esri.arcgismaps.sample.showdevicelocation.components.ShowDeviceLocationViewModel
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialog
import com.esri.arcgismaps.sample.sampleslib.components.SampleTopAppBar

/**
 * Main screen layout for the sample app
 */
@Composable
fun ShowDeviceLocationScreen(sampleName: String) {
    val mapViewModel: ShowDeviceLocationViewModel = viewModel()

    val context = LocalContext.current

    // some parts of the API require an Android Context to properly interact with Android system
    // features, such as LocationProvider and application resources
    ArcGISEnvironment.applicationContext = context.applicationContext

    // Create and remember a location display with a recenter auto pan mode.
    val locationDisplay = rememberLocationDisplay()

    // this variable controls the visibility of the dropdown menu
    var showDropDownMenu by remember { mutableStateOf(false) }

    RequestPermissions(
        context = context,
        onPermissionsGranted = {
            mapViewModel.toggleLocationTracking(mapViewModel.isLocationTrackingEnabled, locationDisplay)
        }
    )

    Scaffold(
        topBar = { SampleTopAppBar(title = sampleName) },
        content = {
            Box(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(it),
            ) {
                MapView(
                    modifier = Modifier
                        .fillMaxSize(),
                    arcGISMap = mapViewModel.arcGISMap,
                    locationDisplay = locationDisplay,
                )

                Card (
                    modifier = Modifier
                        .align(Alignment.BottomStart)
                        .padding(horizontal = 20.dp, vertical = 70.dp)
                        .border(2.dp, MaterialTheme.colorScheme.primary, RoundedCornerShape(20.dp))
                        .width(150.dp)
                        .height(50.dp),
                    shape = RoundedCornerShape(20.dp),
                    elevation = CardDefaults.cardElevation(
                        defaultElevation = 4.dp
                    ),
                ) {
                    Row(
                        modifier = Modifier.fillMaxSize(),
                        verticalAlignment = Alignment.CenterVertically,
                        horizontalArrangement = Arrangement.SpaceEvenly
                    ) {
                        Text(text = "Off", fontSize = 22.sp)
                        Switch(
                            checked = mapViewModel.isLocationTrackingEnabled,
                            onCheckedChange = { isChecked ->
                                mapViewModel.toggleLocationTracking(
                                    isChecked,
                                    locationDisplay
                                )
                            }
                        )
                        Text(text = "On", fontSize = 22.sp)
                    }
                }

                Column (
                    modifier = Modifier
                        .align(Alignment.BottomEnd)
                        .padding(horizontal = 20.dp, vertical = 70.dp)
                ) {
                    DropdownMenu(
                        expanded = showDropDownMenu,
                        onDismissRequest = { showDropDownMenu = false },
                        modifier = Modifier
                            .border(2.dp, MaterialTheme.colorScheme.primary),
                    ) {
                        mapViewModel.dropDownMenuOptions.forEach { option ->
                            DropdownMenuItem(
                                text = @Composable{
                                    Text(option.text, style = TextStyle(fontSize = 22.sp)) },
                                trailingIcon = @Composable{ Image(
                                    painter = painterResource(option.imageId),
                                    contentDescription = null,
                                    modifier = Modifier.size(25.dp),
                                )},
                                onClick = {
                                    showDropDownMenu = false
                                    mapViewModel.onItemSelected(option, locationDisplay)
                                },
                            )
                        }
                    }

                    Spacer(modifier = Modifier.height(5.dp))

                    Card(
                        modifier = Modifier
                            .clickable { showDropDownMenu = true }
                            .border(2.dp, MaterialTheme.colorScheme.primary, RoundedCornerShape(20.dp))
                            .width(150.dp)
                            .height(50.dp),
                        shape = RoundedCornerShape(20.dp),
                        elevation = CardDefaults.cardElevation(
                            defaultElevation = 4.dp
                        ),
                    ) {
                        Row(
                            modifier = Modifier.fillMaxSize(),
                            verticalAlignment = Alignment.CenterVertically,
                            horizontalArrangement = Arrangement.SpaceEvenly
                        ) {
                            Text(text = mapViewModel.selectedItem.text, fontSize = 22.sp)
                            Image(
                                painter = painterResource(mapViewModel.selectedItem.imageId),
                                contentDescription = null,
                                modifier = Modifier.size(25.dp),
                            )
                        }
                    }
                }
            }

            mapViewModel.messageDialogVM.apply {
                if (dialogStatus) {
                    MessageDialog(
                        title = messageTitle,
                        description = messageDescription,
                        onDismissRequest = ::dismissDialog
                    )
                }
            }
        }
    )
}


@Composable
fun RequestPermissions(context: Context, onPermissionsGranted: () -> Unit) {

    // Create an activity result launcher using permissions contract and handle the result.
    val activityResultLauncher = rememberLauncherForActivityResult(
        ActivityResultContracts.RequestMultiplePermissions()
    ) { permissions ->
        // Check if both fine & coarse location permissions are true.
        if (permissions.all { it.value }) {
            onPermissionsGranted()
        } else {
            showError(context, "Location permissions were denied")
        }
    }

    LaunchedEffect(Unit) {
        activityResultLauncher.launch(
            // Request both fine and coarse location permissions.
            arrayOf(
                Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_FINE_LOCATION
            )
        )
    }
}


fun showError(context: Context, message: String) {
    Toast.makeText(context, message, Toast.LENGTH_LONG).show()
}