add handling for different content types

Author: nplasterer

build.gradle

@@ -1,12 +1,12 @@
-//buildscript {
-//    repositories {
-//        google()
-//        mavenCentral()
-//    }
-//    dependencies {
-//        classpath 'com.google.gms:google-services:4.3.15'
-//    }
-//}
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.google.gms:google-services:4.3.15'
+    }
+}
 
 plugins {
     id 'com.android.application' version '8.0.0' apply false

example/build.gradle

@@ -8,7 +8,7 @@ buildscript {
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
-//    id 'com.google.gms.google-services'
+    id 'com.google.gms.google-services'
 }
 
 android {

example/src/main/java/org/xmtp/android/example/pushnotifications/PushNotificationsService.kt

@@ -23,6 +23,7 @@ import org.xmtp.android.example.utils.KeyUtil
 import org.xmtp.android.library.Conversation
 import org.xmtp.android.library.messages.EnvelopeBuilder
 import org.xmtp.android.library.messages.Topic
+import uniffi.xmtpv3.org.xmtp.android.library.codecs.GroupMembershipChanges
 import java.util.Date
 
 class PushNotificationsService : FirebaseMessagingService() {
@@ -98,7 +99,16 @@ class PushNotificationsService : FirebaseMessagingService() {
             }
             val peerAddress = conversation.peerAddress
 
-            val body = decodedMessage.body
+            val body: String = if (decodedMessage.content<Any>() is String) {
+                decodedMessage.body
+            } else if (decodedMessage.content<Any>() is GroupMembershipChanges) {
+                val changes = decodedMessage.content() as? GroupMembershipChanges
+                "Membership Changed ${
+                    changes?.membersAddedList?.mapNotNull { it.accountAddress }.toString()
+                }"
+            } else {
+                ""
+            }
             val title = peerAddress.truncatedAddress()
 
             val pendingIntent = PendingIntent.getActivity(