add android push customization

example/android/app/src/main/kotlin/com/example/example/Application.kt

@@ -1,5 +1,6 @@
 package com.example.example
 
+import com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin
 import com.example.path_provider.PathProviderPlugin
 import io.flutter.app.FlutterApplication
 import io.flutter.plugin.common.PluginRegistry
@@ -15,6 +16,8 @@ class Application : FlutterApplication(), PluginRegistrantCallback {
     }
 
     override fun registerWith(registry: PluginRegistry?) {
+        FlutterLocalNotificationsPlugin.registerWith(registry?.registrarFor(
+                "com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin"))
         SharedPreferencesPlugin.registerWith(registry?.registrarFor(
                 "io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin"))
         FirebaseMessagingPlugin.registerWith(registry?.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"))

example/lib/main.dart

@@ -1,10 +1,35 @@
 import 'package:flutter/material.dart';
 import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
+Future<void> _handleBackgroundNotification(
+  Map<String, dynamic> notification,
+) async {
+  final notificationData = await NotificationService.storeMessage(notification);
+
+  final androidPlatformChannelSpecifics = AndroidNotificationDetails(
+    'Message notifications',
+    'Message notifications',
+    'Channel dedicated to message notifications',
+    importance: Importance.Max,
+    priority: Priority.High,
+  );
+
+  final androidNotificationOptions = AndroidNotificationOptions(
+    androidNotificationDetails: androidPlatformChannelSpecifics,
+    id: notificationData.message.id.hashCode,
+    title:
+        'CUSTOM ${notificationData.message.user.name} @ ${notificationData.channel.cid}',
+    body: notificationData.message.text,
+  );
+
+  await NotificationService.sendNotification(androidNotificationOptions);
+}
+
 void main() async {
   final client = Client(
     's2dxdhpxd94g',
     logLevel: Level.INFO,
+    notificationHandler: _handleBackgroundNotification,
   );
 
   await client.setUser(