Changes to enable Firebase cloud messaging (FCM)

app/build.gradle.kts

@@ -186,6 +186,7 @@ dependencies {
     implementation(platform(libs.firebase.bom))
     implementation(libs.firebase.ai)
     implementation(libs.datastore)
+    implementation(libs.firebase.messaging)
 
     implementation(libs.adaptive.navigation3)
     implementation(libs.navigation3.runtime)

app/src/main/AndroidManifest.xml

@@ -199,6 +199,12 @@
                 android:value="" />
         </service>
 
+        <service android:name=".fcm.MessagingService" android:exported="false">
+            <intent-filter>
+                <action android:name="com.google.firebase.MESSAGING_EVENT" />
+            </intent-filter>
+        </service>
+
     </application>
 
 </manifest>

app/src/main/java/com/google/android/samples/socialite/MainActivity.kt

@@ -20,6 +20,7 @@ import android.content.Intent
 import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Bundle
+import android.util.Log
 import android.view.KeyEvent
 import android.view.KeyboardShortcutGroup
 import android.view.KeyboardShortcutInfo
@@ -30,8 +31,10 @@ import androidx.activity.enableEdgeToEdge
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.glance.appwidget.updateAll
 import androidx.lifecycle.lifecycleScope
+import com.google.android.gms.tasks.OnCompleteListener
 import com.google.android.samples.socialite.ui.Main
 import com.google.android.samples.socialite.widget.SociaLiteAppWidget
+import com.google.firebase.messaging.FirebaseMessaging
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.launch
 
@@ -40,6 +43,7 @@ class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         installSplashScreen()
         enableEdgeToEdge()
+        initializeFcm()
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
             window.isNavigationBarContrastEnforced = false
         }
@@ -55,6 +59,25 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    /**
+     * Sets up Firebase Cloud Messaging (FCM) for push notifications.
+     * FCM enables cross device message delivery and versatile message delivery.
+     * See https://firebase.google.com/docs/cloud-messaging/android/get-started.
+     */
+    private fun initializeFcm() {
+        FirebaseMessaging.getInstance().token.addOnCompleteListener(
+            OnCompleteListener { task ->
+                if (!task.isSuccessful) {
+                    Log.w("FCM", "Fetching FCM registration token failed", task.exception)
+                    return@OnCompleteListener
+                } // Get new FCM registration token
+                val token = task.result
+                // Log token, for testing purposes only.
+                // Log.d("FCM", "FCM message token $token")
+            },
+        )
+    }
+
     private fun extractAppArgs(intent: Intent?): AppArgs? {
         if (intent == null) return null
         return AppArgs.ShortcutParams.tryFrom(intent) ?: AppArgs.LaunchParams.tryFrom(intent)

app/src/main/java/com/google/android/samples/socialite/fcm/MessagingService.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2026 The Android Open Source Project
+ *
+ * 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.google.android.samples.socialite.fcm
+
+import com.google.firebase.messaging.FirebaseMessagingService
+import com.google.firebase.messaging.RemoteMessage
+
+class MessagingService : FirebaseMessagingService() {
+
+    override fun onNewToken(token: String) {
+        // Token used for device targeting.
+        // See https://firebase.google.com/docs/cloud-messaging/android/get-started#access-fcm-registration-token
+        super.onNewToken(token)
+    }
+
+    override fun onMessageReceived(remoteMessage: RemoteMessage) {
+        super.onMessageReceived(remoteMessage)
+
+        // Handle data payload
+        if (remoteMessage.data.isNotEmpty()) {
+            // Log.d("FCM", "Message data payload: ${remoteMessage.data}")
+        }
+
+        // Handle notification payload
+        remoteMessage.notification?.let {
+            // Log.d("FCM", "Message Notification Body: ${it.body}")
+            // Trigger local notification here
+        }
+    }
+}

build.gradle.kts

@@ -26,6 +26,7 @@ plugins {
     alias(libs.plugins.spotless) apply false
     alias(libs.plugins.hilt) apply false
     alias(libs.plugins.ksp) apply false
+    alias(libs.plugins.google.gms.google.services) apply false
 }
 
 subprojects {

gradle/libs.versions.toml

@@ -30,8 +30,8 @@ core = "1.16.0"
 core-performance = "1.0.0"
 core-splashscreen = "1.0.1"
 espresso = "3.6.1"
-firebaseBoM = "33.14.0"
-googleGmsGoogleServices = "4.4.2"
+firebaseBoM = "34.10.0"
+googleGmsGoogleServices = "4.4.4"
 download = "5.6.0"
 graphics = "1.0.1"
 hilt = "2.56.1"
@@ -145,6 +145,8 @@ generativeai = { group = "com.google.ai.client.generativeai", name = "generative
 datastore = { group = "androidx.datastore", name = "datastore-preferences", version.ref = "datastore" }
 firebase-bom = { group = "com.google.firebase", name = "firebase-bom", version.ref = "firebaseBoM" }
 firebase-ai = { group = "com.google.firebase", name = "firebase-ai" }
+firebase-analytics = { group = "com.google.firebase", name = "firebase-analytics" }
+firebase-messaging = {group = "com.google.firebase", name = "firebase-messaging" }
 vision-common = { group = "com.google.mlkit", name = "vision-common", version.ref = "visionCommon" }