Facilitates push and local notifications across various platforms, utilizing Firebase Cloud Messaging and Huawei Push Kit for push notifications on mobile, and supporting local notifications on multiple platforms including web and desktop.
Simple and easy to use Kotlin Multiplatform Push Notification library (using Firebase Cloud Messaging and Huawei Push Kit) targeting ios and android, and Local Notification targetting android, ios, desktop and web (js and wasm).
This library is used in FindTravelNow production KMP project.
You can check out Documentation for full library api information.
Related Blog Posts
KMPNotifier Update: Web, Desktop, and New Features for Kotlin Multiplatform Notifications
How to implement Push Notifications in Kotlin Multiplatform
Before starting, ensure your project is set up in the respective cloud consoles:
google-services.json to your Android app module, and GoogleService-Info.plist to your iOS app.agconnect-services.json to your Android app module.minSdkVersion 21iOS 14.1KMPNotifier is available on Maven Central.
1. Root build.gradle.kts (or settings.gradle.kts):
Add mavenCentral() to repositories and declare the necessary service plugins.
// settings.gradle.kts or build.gradle.kts in project root
pluginManagement { // If in settings.gradle.kts
repositories {
google()
mavenCentral()
gradlePluginPortal()
}
}
plugins {
// Apply KMPNotifier plugin (replace <latest_kmpnotifier_version> with the actual latest version)
id() version apply
id() version apply
id() version apply
id() version apply
}
Then in your shared module you add dependency in commonMain. Latest version: . In iOS framework part export this library as well.
sourceSets {
commonMain.dependencies {
// Replace <latest_library_version> with the actual latest version from Maven Central
api("io.github.mirzemehdi:kmpnotifier:<latest_library_version>")
}
}
// For iOS, export the library in the framework block
listOf(iosX64(),iosArm64(),iosSimulatorArm64()).forEach { iosTarget ->
iosTarget.binaries.framework {
export("io.github.mirzemehdi:kmpnotifier:<latest_library_version>")
// ...
}
}
3. Android App Module (androidApp/build.gradle.kts):
Apply the Android application plugin, the KMPNotifier plugin, and the respective service plugins.
plugins {
id("com.android.application")
id()
id()
}
android {
defaultConfig {
manifestPlaceholders.putAll(
mapOf(
to ,
to
)
)
}
}
Note: If you support both Firebase and Huawei, you will likely need to configure them per flavor. The com.mmk.kmpnotifier plugin aims to simplify this; check its documentation for advanced flavor-specific setups.
In all platforms on Application Start you need to initialize library using
//passing android, ios, desktop or web configuration depending on the platform
NotifierManager.initialize(NotificationPlatformConfiguration)
You need to put notification icon into (or your common resources folder for Compose Multiplatform). For more information:
On application start initialize it using Web configuration
fun main() {
NotifierManager.initialize(
NotificationPlatformConfiguration.Web(
askNotificationPermissionOnStart = ,
notificationIconPath =
)
)
}
You can send either local or push notification.
Local notifications are supported on Android, iOS, Desktop, JS and Wasm targets. Image is supported on Android and iOS.
val notifier = NotifierManager.getLocalNotifier()
notifier.notify {
id = Random.nextInt(0, Int.MAX_VALUE)
title = "Title from KMPNotifier"
body = "Body message from KMPNotifier"
payloadData = mapOf(
Notifier.KEY_URL to "https://github.com/mirzemehdi/KMPNotifier/",
"extraKey" to "randomValue"
)
image = NotificationImage.Url("https://github.com/user-attachments/assets/a0f38159-b31d-4a47-97a7-cc230e15d30b")
}
notifier.remove(notificationId) //Removes notification by Id
notifier.removeAll() //Removes all notification
Push notifications are supported for Android (Firebase, Huawei) and iOS (Firebase/APNS).
In this method you can send notification token to the server.
NotifierManager.addListener(object : NotifierManager.Listener {
override fun onNewToken(token: String) {
println("onNewToken: $token") //Update user token in the server if needed
}
})
NotifierManager.addListener(object : NotifierManager.Listener {
override fun onPushNotificationWithPayloadData(title: String?, body: String?, data: PayloadData) {
//PayloadData is just typeAlias for Map<String,Any?>.
println("Push Notification is received: Title: $title and Body: $body and Notification payloadData: $data")
}
})
NotifierManager.addListener(object : NotifierManager.Listener {
override fun onPushNotification(title:String?, body:String?) {
println("Push Notification notification title: $title, body: $body")
}
})
NotifierManager.addListener(object : NotifierManager.Listener {
override fun onPayloadData(data: PayloadData) {
println("Push Notification payloadData: $data") //PayloadData is just typeAlias for Map<String,Any?>.
}
})
And you need to call below platform-specific functions in order to receive payload data properly when the app is in the background or terminated.
Call NotifierManager.onCreateOrOnNewIntent(intent) on launcher Activity's onCreate and onNewIntent methods.
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
NotifierManager.onCreateOrOnNewIntent(intent)
// ...
}
override fun onNewIntent(intent: Intent?) {
super.onNewIntent(intent)
NotifierManager.onCreateOrOnNewIntent(intent)
}
Call NotifierManager.shared.onApplicationDidReceiveRemoteNotification(userInfo: userInfo) on application's didReceiveRemoteNotification method.
// In your AppDelegate.swift
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) async -> UIBackgroundFetchResult {
NotifierManager.shared.onApplicationDidReceiveRemoteNotification(userInfo: userInfo)
return UIBackgroundFetchResult.newData
}
Make sure you follow previous step for getting payload data properly.
NotifierManager.addListener(object : NotifierManager.Listener {
override fun onNotificationClicked(data: PayloadData) {
super.onNotificationClicked(data)
println("Notification clicked, Notification payloadData: $data")
}
})
val pushNotifier = NotifierManager.getPushNotifier()
// pushNotifier.getToken() //Get current user push notification token
// pushNotifier.deleteMyToken() //Delete user's token for example when user logs out
// pushNotifier.subscribeToTopic("new_users")
// pushNotifier.unSubscribeFromTopic("new_users")
For setting custom notification sound, check #61
For setting Intent data in Android (for deeplink), check #60
For permissionUtil, or manually asking notification permission check #27
If you want to see internal logs of the library, you can set a logger using:
NotifierManager.setLogger { message ->
// Log the message, e.g., using your own logger or simply println
println(message)
}
Regardless of whether you use Firebase or Huawei, initialize NotifierManager in your Application class.
The com.mmk.kmpnotifier plugin, along with com.google.gms.google-services for firebase, will handle the necessary AndroidManifest.xml entries (like services and permissions).
class MyApplication : Application() {
override fun onCreate() {
super.onCreate()
/**
* By default showPushNotification value is true.
* When set showPushNotification to false foreground push notification will not be shown to user.
* You can still get notification content using #onPushNotification listener method.
*/
NotifierManager.initialize(
configuration = NotificationPlatformConfiguration.Android(
notificationIconResId = R.drawable.ic_launcher_foreground, // Replace with your icon
showPushNotification = true,
// Add any other specific configurations if needed
)
)
}
}
Runtime Notification Permission (Android 13+):
Starting from Android 13 (API Level 33), you need to request the POST_NOTIFICATIONS runtime permission.
// In your Activity or Composable
val permissionUtil by permissionUtil() // Assuming this is a utility you have
permissionUtil.askNotificationPermission() // This will ask permission on Android 13+
agconnect-services.json: Ensure this file from Huawei AppGallery Connect is placed in your Android app module's root directory (e.g., androidApp/agconnect-services.json).manifestPlaceholders: As shown in the androidApp/build.gradle.kts setup, define huawei_agconnect_appid and huawei_agconnect_cpid. The com.mmk.kmpnotifier plugin uses these to configure the manifest correctly for Huawei services. You generally do not need to add Huawei services or permissions manually to the AndroidManifest.xml if the plugin is applied.NotifierManager as shown in the "Android (Common Setup)" section.First you just need to include FirebaseMessaging library to your ios app from Xcode. Then on application start you need to call both FirebaseApp initialization and NotifierManager initialization methods, and apnsToken setting as below. Don't forget to add Push Notifications and Background Modes (Remote Notifications) signing capability in Xcode.
import SwiftUI
import shared // Your shared module
import FirebaseCore
import FirebaseMessaging
class AppDelegate: NSObject, UIApplicationDelegate {
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
FirebaseApp.configure() //important for Firebase
//By default showPushNotification value is true.
//When set showPushNotification to false foreground push notification will not be shown.
//You can still get notification content using #onPushNotification listener method.
NotifierManager.shared.initialize(configuration: NotificationPlatformConfigurationIos(
showPushNotification: true,
askNotificationPermissionOnStart: true, // Asks user for notification permission on app start
notificationSoundName: nil // Optional: "default" or custom sound file e.g., "sound.caf"
)
)
return true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
Messaging.messaging().apnsToken = deviceToken // For Firebase
// If KMPNotifier supports direct APNS token handling for other services, add here.
}
}
@main
struct iOSApp: App {
@UIApplicationDelegateAdaptor(AppDelegate.self) var delegate
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
composeResources/drawablefun main() = application {
NotifierManager.initialize(
NotificationPlatformConfiguration.Desktop(
showPushNotification = true,
notificationIconPath = composeDesktopResourcesPath() + File.separator + "ic_notification.png"
)
)
AppInitializer.onApplicationStart()
Window(
onCloseRequest = ::exitApplication,
title = "KMPNotifier Desktop",
) {
println("Desktop app is started")
App()
}
}
Note: If you are using mac make sure you also allow notifications for browser from system system settings in order to see web notifications.
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