Google Map
Manage Car Location
We need to keep track of our car across application runs. To do this, we'll use a Preferences Datastore to store the latitude and longitude of the car.
The Datastore API exposes the data from the preference as a Kotlin Flow; whenever the preference is updated, the new value is emitted. We'll expose the car location to the UI from the view model, allowing new values to be collected. The preferences data store is a simple file that stores values. This is useful when a database would be overkill for storing small amounts of data. The datastore is typically used to hold simple application state across application runs.
We start by Adding the Datastore Dependency. This allows us to store and load the car's location.
carLatLngis aFlowcreated by mapping the data store'sFlowinto aLatLnginstance. If either latitude or longitude are missing, anullis emitted.clearCarLocationremoves the latitude and longitude from the data store.setCarLocationstores the current location's latitude and longitude in datastore (or removes them if there is no current location)
When clearCarLocation or setCarLocation change the latitude/longitude in the data store, new data is emitted to the data store Flow, which will trigger the carLatLng to emit a new LatLng or null.
The state in the GoogleMapDisplay is similar to the current location setup.
Code Changes
CHANGED: /app/build.gradle.kts
@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
plugins {
alias(libs.plugins.androidApplication)
alias(libs.plugins.kotlinAndroid)
alias(libs.plugins.secrets)
}
kotlin {
jvmToolchain(17)
}
android {
namespace = "com.androidbyexample.googlemap"
compileSdk = 34
defaultConfig {
applicationId = "com.androidbyexample.googlemap"
minSdk = 24
targetSdk = 34
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"
)
}
}
buildFeatures {
compose = true
}
composeOptions {
kotlinCompilerExtensionVersion = "1.5.3"
}
packaging {
resources {
excludes += "/META-INF/{AL2.0,LGPL2.1}"
}
}
}
dependencies {
implementation(libs.datastore.preferences)// implementation(libs.icons.extended)
implementation(libs.location.services)
implementation(libs.runtime.compose)
implementation(libs.maps.compose)
implementation(libs.maps.compose.utils)
implementation(libs.core.ktx)
implementation(libs.lifecycle.runtime.ktx)
implementation(libs.activity.compose)
implementation(platform(libs.compose.bom))
implementation(libs.ui)
implementation(libs.ui.graphics)
implementation(libs.ui.tooling.preview)
implementation(libs.material3)
testImplementation(libs.junit)
androidTestImplementation(libs.androidx.test.ext.junit)
androidTestImplementation(libs.espresso.core)
androidTestImplementation(platform(libs.compose.bom))
androidTestImplementation(libs.ui.test.junit4)
debugImplementation(libs.ui.tooling)
debugImplementation(libs.ui.test.manifest)
}
CHANGED: /app/src/main/java/com/androidbyexample/googlemap/CarViewModel.kt
package com.androidbyexample.googlemap
import android.app.Application
import android.content.Contextimport android.location.Location
import androidx.datastore.core.DataStoreimport androidx.datastore.preferences.core.Preferencesimport androidx.datastore.preferences.core.editimport androidx.datastore.preferences.core.stringPreferencesKeyimport androidx.datastore.preferences.preferencesDataStoreimport androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScopeimport com.google.android.gms.maps.model.LatLngimport kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.mapimport kotlinx.coroutines.launchprivate val LAT_PREF = stringPreferencesKey("lat")private val LON_PREF = stringPreferencesKey("lon")
class CarViewModel(application: Application) : AndroidViewModel(application) {
private val _currentLocation = MutableStateFlow<Location?>(null)
val currentLocation: Flow<Location?>
get() = _currentLocation
fun updateLocation(location: Location?) {
_currentLocation.value = location
}
private val Context.preferencesDataStore: DataStore<Preferences> by preferencesDataStore(name = "carfinder") val carLatLng = application.preferencesDataStore.data.map { preferences -> preferences[LAT_PREF]?.let { latString -> preferences[LON_PREF]?.let { lonString -> LatLng(latString.toDouble(), lonString.toDouble()) } } } fun clearCarLocation() { viewModelScope.launch { getApplication<Application>().preferencesDataStore.edit { preferences -> preferences.remove(LAT_PREF) preferences.remove(LON_PREF) } } } fun setCarLocation() { viewModelScope.launch { _currentLocation.value?.let { location -> getApplication<Application>().preferencesDataStore.edit { preferences -> preferences[LAT_PREF] = location.latitude.toString() preferences[LON_PREF] = location.longitude.toString() } } ?: run { clearCarLocation() } } }}
CHANGED: /app/src/main/java/com/androidbyexample/googlemap/MainActivity.kt
package com.androidbyexample.googlemap
import android.Manifest
import android.annotation.SuppressLint
import android.app.AlertDialog
import android.content.Intent
import android.content.pm.PackageManager
import android.location.Location
import android.net.Uri
import android.os.Bundle
import android.os.Looper
import android.provider.Settings
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.result.contract.ActivityResultContracts
import androidx.activity.viewModels
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.EnterTransition
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Surface
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.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import androidx.core.app.ActivityCompat
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import com.androidbyexample.googlemap.ui.theme.GoogleMapTheme
import com.google.android.gms.common.GoogleApiAvailability
import com.google.android.gms.location.FusedLocationProviderClient
import com.google.android.gms.location.LocationCallback
import com.google.android.gms.location.LocationRequest
import com.google.android.gms.location.LocationResult
import com.google.android.gms.location.LocationServices
import com.google.android.gms.location.Priority
import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.model.BitmapDescriptor
import com.google.android.gms.maps.model.CameraPosition
import com.google.android.gms.maps.model.LatLng
import com.google.maps.android.compose.CameraPositionState
import com.google.maps.android.compose.GoogleMap
import com.google.maps.android.compose.MapProperties
import com.google.maps.android.compose.MapType
import com.google.maps.android.compose.MarkerInfoWindowContent
import com.google.maps.android.compose.MarkerState
import com.google.maps.android.compose.rememberCameraPositionState
import com.google.maps.android.compose.rememberMarkerStateimport kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
class MainActivity : ComponentActivity() {
private val viewModel: CarViewModel by viewModels()
private lateinit var fusedLocationProviderClient: FusedLocationProviderClient
private val locationCallback = object : LocationCallback() {
override fun onLocationResult(locationResult: LocationResult) {
viewModel.updateLocation(locationResult.lastLocation)
}
}
private val getLocationPermission =
registerForActivityResult(
ActivityResultContracts.RequestMultiplePermissions()
) { isGranted ->
if (isGranted.values.any { it }) {
startLocationAndMap()
} else {
// if the user denied permissions, tell them they
// cannot use the app without them. In general,
// you should try to just reduce function and let the
// user continue, but location is a key part of this
// application.
// (Note that a real version of this application
// might allow the user to manually click on the map
// to set their current location, and we wouldn't
// show this dialog, or perhaps only show it once)
// NOTE: This is a normal Android-View-based dialog, not a compose one!
AlertDialog.Builder(this)
.setTitle("Permissions Needed")
.setMessage(
"We need coarse-location or fine-location permission " +
"to locate a car (fine location is highly " +
"recommended for accurate car locating). " +
"Please allow these permissions via App Info " +
"settings")
.setCancelable(false)
.setNegativeButton("Quit") { _, _ -> finish() }
.setPositiveButton("App Info") { _, _ ->
startActivity(
Intent(
Settings.ACTION_APPLICATION_DETAILS_SETTINGS
).apply {
data = Uri.parse("package:$packageName")
}
)
finish()
}
.show()
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GoogleApiAvailability.getInstance()
.makeGooglePlayServicesAvailable(this)
.addOnSuccessListener {
if (ActivityCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_FINE_LOCATION
) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(
this,
Manifest.permission.ACCESS_COARSE_LOCATION
) != PackageManager.PERMISSION_GRANTED
) {
getLocationPermission.launch(
arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION
)
)
} else {
startLocationAndMap()
}
}.addOnFailureListener(this) {
Toast.makeText(
this,
"Google Play services required (or upgrade required)",
Toast.LENGTH_SHORT
).show()
finish()
}
}
@SuppressLint("MissingPermission")
fun startLocationAndMap() {
val locationRequest =
LocationRequest.Builder(Priority.PRIORITY_HIGH_ACCURACY, 5000)
.setWaitForAccurateLocation(false)
.setMinUpdateIntervalMillis(0)
.setMaxUpdateDelayMillis(5000)
.build()
fusedLocationProviderClient =
LocationServices.getFusedLocationProviderClient(this)
fusedLocationProviderClient.requestLocationUpdates(
locationRequest,
locationCallback,
Looper.getMainLooper()
)
setContent {
GoogleMapTheme {
// A surface container using the 'background' color from the theme
Surface(
modifier = Modifier.fillMaxSize(),
color = MaterialTheme.colorScheme.background
) {
val cameraPositionState = rememberCameraPositionState()
val currentLocation by viewModel.currentLocation.collectAsStateWithLifecycle(
initialValue = null
)
val carLatLng by viewModel.carLatLng.collectAsStateWithLifecycle(initialValue = null) GoogleMapDisplay(
currentLocation = currentLocation,
carLatLng = carLatLng, cameraPositionState = cameraPositionState,
onSetCarLocation = viewModel::setCarLocation, onClearCarLocation = viewModel::clearCarLocation, modifier = Modifier.fillMaxSize(),
)
}
}
}
}
}
@Composable
fun GoogleMapDisplay(
currentLocation: Location?,
carLatLng: LatLng?, cameraPositionState: CameraPositionState,
onSetCarLocation: () -> Unit, onClearCarLocation: () -> Unit, modifier: Modifier,
) {
var mapLoaded by remember { mutableStateOf(false) }
var currentMapType by remember { mutableStateOf(MapType.NORMAL) }
var mapProperties by remember {
mutableStateOf(MapProperties(mapType = MapType.NORMAL))
}
val currentLocationState = remember(currentLocation) {
currentLocation?.let {
MarkerState(
LatLng(
it.latitude,
it.longitude
)
)
}
}
val carState = rememberMarkerState("car") val context = LocalContext.current
var currentLocationIcon by
remember { mutableStateOf<BitmapDescriptor?>(null) }
var carIcon by remember { mutableStateOf<BitmapDescriptor?>(null) } val scope = rememberCoroutineScope()
var initialBoundsSet by remember { mutableStateOf(false) }
LaunchedEffect(key1 = currentLocation) {
if (currentLocation != null) {
if (!initialBoundsSet) {
initialBoundsSet = true
val current =
LatLng(currentLocation.latitude, currentLocation.longitude)
cameraPositionState.animate(
CameraUpdateFactory.newLatLngZoom(
current,
16f
), 1000
)
}
}
}
Scaffold(
topBar = {
CarTopBar(
currentLocation = currentLocation,
// carLatLng = null,// onSetCarLocation = { TODO() },// onClearCarLocation = { TODO() }, carLatLng = carLatLng, onSetCarLocation = onSetCarLocation, onClearCarLocation = onClearCarLocation, onWalkToCar = { TODO() },
onGoToCurrentLocation = {
currentLocation?.let { curr ->
scope.launch {
cameraPositionState.animate(
CameraUpdateFactory.newLatLngZoom(
LatLng(curr.latitude, curr.longitude),
16f
), 1000
)
}
} ?: Toast.makeText(
context,
"No current location available",
Toast.LENGTH_LONG
).show()
},
)
},
content = { paddingValues ->
Box(
modifier = modifier.padding(paddingValues),
) {
Column(
modifier = Modifier.fillMaxSize()
) {
MapTypeSelector(
currentValue = currentMapType,
modifier = Modifier.fillMaxWidth(),
) {
mapProperties = mapProperties.copy(mapType = it)
currentMapType = it
}
GoogleMap(
cameraPositionState = cameraPositionState,
onMapLoaded = {
mapLoaded = true
scope.launch(Dispatchers.IO) {
currentLocationIcon =
context.loadBitmapDescriptor(
R.drawable.ic_current_location
)
carIcon = context.loadBitmapDescriptor( R.drawable.ic_car ) }
},
properties = mapProperties,
modifier = Modifier
.fillMaxWidth()
.weight(1f),
) {
currentLocationState?.let {
MarkerInfoWindowContent(
state = it,
icon = currentLocationIcon,
anchor = Offset(0.5f, 0.5f),
title = stringResource(
id = R.string.current_location
),
)
}
carLatLng?.let { carState.position = it MarkerInfoWindowContent( state = carState, icon = carIcon, anchor = Offset(0.5f, 0.5f), title = stringResource( id = R.string.car_location ), ) } }
}
}
if (!mapLoaded) {
AnimatedVisibility(
visible = true,
modifier = Modifier.fillMaxSize(),
enter = EnterTransition.None,
exit = fadeOut()
) {
CircularProgressIndicator(
modifier = Modifier
.background(MaterialTheme.colorScheme.background)
.wrapContentSize()
)
}
}
}
)
}
ADDED: /app/src/main/res/drawable/ic_car.xml
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CHANGED: /app/src/main/res/values/strings.xml
<resources>
<string name="app_name">Car finder</string>
<string name="map_type">Map Type</string>
<string name="current_location">Current Location</string>
<string name="go_to_current_location">Go to Current Location</string>
<string name="remember_location">Remember Location</string>
<string name="navigate">Walk to Car</string>
<string name="forget_location">Forget Car Location</string>
<string name="car_location">Car Location</string></resources>
CHANGED: /gradle/libs.versions.toml
[versions] agp = "8.2.0-beta06" kotlin = "1.9.10" core-ktx = "1.12.0" junit = "4.13.2" androidx-test-ext-junit = "1.1.5" espresso-core = "3.5.1" lifecycle-runtime-ktx = "2.6.2" activity-compose = "1.8.0" compose-bom = "2023.10.00"secrets = "2.0.1"maps-compose = "3.0.0" # bug in 3.1.0 - map only takes up 50% of columnlocation-services = "21.0.1" runtime-compose = "2.6.2" icons-extended = "1.6.0-alpha06" # needed to bump to version that has source datastore-preferences = "1.0.0" [libraries] core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "core-ktx" } junit = { group = "junit", name = "junit", version.ref = "junit" } androidx-test-ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "androidx-test-ext-junit" } espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espresso-core" } lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycle-runtime-ktx" } activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activity-compose" } compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "compose-bom" } ui = { group = "androidx.compose.ui", name = "ui" } ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" } ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" } ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" } ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" } ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" } material3 = { group = "androidx.compose.material3", name = "material3" }maps-compose = { group = "com.google.maps.android", name = "maps-compose", version.ref = "maps-compose" } maps-compose-utils = { group = "com.google.maps.android", name = "maps-compose-utils", version.ref = "maps-compose" }location-services = { group = "com.google.android.gms", name = "play-services-location", version.ref = "location-services" } runtime-compose = { group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "runtime-compose" } icons-extended = { group = "androidx.compose.material", name = "material-icons-extended", version.ref = "icons-extended" } datastore-preferences = { group = "androidx.datastore", name = "datastore-preferences", version.ref = "datastore-preferences" } [plugins] androidApplication = { id = "com.android.application", version.ref = "agp" } kotlinAndroid = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }secrets = { id = "com.google.android.libraries.mapsplatform.secrets-gradle-plugin", version.ref = "secrets" }