This repository contains Kotlin extensions (KTX) for:
It enables you to write more concise, idiomatic Kotlin. Each set of extensions can be used independently or together.
dependencies {
// KTX for the Maps SDK for Android library
implementation 'com.google.maps.android:maps-ktx:5.2.0'
// KTX for the Maps SDK for Android Utility Library
implementation 'com.google.maps.android:maps-utils-ktx:5.2.0'
}
With this KTX library, you should be able to take advantage of several Kotlin language features such as extension functions, named parameters and default arguments, destructuring declarations, and coroutines.
This repository includes a demo app that illustrates the use of this KTX library.
To run the demo app, you'll have to:
secrets.properties (this file should NOT be under version control to protect your API key)secrets.properties that looks like MAPS_API_KEY=YOUR_API_KEY, where YOUR_API_KEY is the API key you obtained in the first stepAdding a Marker:
Before
GoogleMap googleMap = // ...
LatLng sydney = new LatLng(-33.852, 151.211);
MarkerOptions markerOptions = new MarkerOptions()
.position(Sydney)
.title("Marker in Sydney");
Marker marker = googleMap.addMarker(markerOptions);
After
val googleMap = // ...
val sydney = LatLng(-33.852, 151.211)
val marker = googleMap.addMarker {
position(sydney)
title("Marker in Sydney")
}
Accessing a GoogleMap instance can be retrieved using coroutines vs. traditional the callback mechanism. The example here demonstrates how you can use this feature alongside with Lifecycle-aware coroutine scopes provided in Android’s Architecture Components. To use this, you'll need to add the following to your build.gradle dependencies: implementation 'androidx.lifecycle:lifecycle-runtime-ktx:<latest-version>'
Before
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SupportMapFragment mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map));
mapFragment.getMapAsync(new OnMapReadyCallback {
@Override
public void onMapReady(GoogleMap googleMap) {
// Access GoogleMap instance here
}
});
}
After
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as? SupportMapFragment
lifecycle.coroutineScope.launchWhenCreated {
val googleMap = mapFragment?.awaitMap()
}
}
Listing to camera events can be collected via Kotlin Flow.
Before
val googleMap = //...
googleMap.setOnCameraIdleListener = { //... }
googleMap.setOnCameraMoveCanceledListener { //... }
googleMap.setOnCameraMoveListener { //... }
googleMap.setOnCameraMoveStartedListener { //... }
After
// To be invoked within a coroutine scope
googleMap.cameraIdleEvents().collect { //... }
googleMap.cameraMoveCanceledEvents().collect { //... }
googleMap.cameraMoveEvents().collect { //... }
googleMap.cameraMoveStartedEvents().collect { //... } Maps SDK for Android Utilities KTX
Checking if a LatLng is contained within a Polygon:
Before
Polygon polygon = // some polygon LatLng latlng = // some latlng boolean result = PolygonUtil.containsLocation(latlng, polygon.getPoints(), true);
After
val polygon: Polygon = // some polygon val latlng: LatLng = // some latlng val result: Boolean = polygon.contains(latLng)Named parameters and default arguments
Creating a GeoJsonLayer object:
Before
GeoJsonLayer layer = new GeoJsonLayer(
map,
geoJsonFile,
null,
polygonManager,
null,
groundOverlayManager
);
After
val layer = geoJsonLayer(
map = map,
geoJsonFile = geoJsonFile,
polygonManager = polygonManager,
groundOverlayManager = groundOverlayManager
) Destructuring Declarations
Destructuring properties of a Point:
Before
Point point = new Point(1.0, 2.0); double x = point.x; double y = point.y;
After
val point = Point(1.0, 2.0) val (x, y) = point
You can learn more about all the extensions provided by this library by reading the documentation.
Contributions are welcome and encouraged! If you'd like to contribute, send us a pull request and refer to our code of conduct and contributing guide.
This library uses Google Maps Platform services. Use of Google Maps Platform services through this library is subject to the Google Maps Platform Terms of Service.
If your billing address is in the European Economic Area, effective on 8 July 2025, the Google Maps Platform EEA Terms of Service will apply to your use of the Services. Functionality varies by region. Learn more.
This library is not a Google Maps Platform Core Service. Therefore, the Google Maps Platform Terms of Service (e.g. Technical Support Services, Service Level Agreements, and Deprecation Policy) do not apply to the code in this library.
This library is offered via an open source license. It is not governed by the Google Maps Platform Support [Technical Support Services Guidelines, the SLA, or the Deprecation Policy. However, any Google Maps Platform services used by the library remain subject to the Google Maps Platform Terms of Service.
This library adheres to semantic versioning to indicate when backwards-incompatible changes are introduced. Accordingly, while the library is in version 0.x, backwards-incompatible changes may be introduced at any time.
If you find a bug, or have a feature request, please file an issue on GitHub. If you would like to get answers to technical questions from other Google Maps Platform developers, ask through one of our developer community channels. If you'd like to contribute, please check the contributing guide.
You can also discuss this library on our Discord server.
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