chore(examples): add env-based Android channel ID override

Author: fadi-george

examples/demo/.env.example

@@ -1,2 +1,6 @@
 ONESIGNAL_APP_ID=your-onesignal-app-id
 ONESIGNAL_API_KEY=your-onesignal-api-key
+
+# Optional: Android Notification Channel ID for the WITH SOUND test notification.
+# Create one in your OneSignal dashboard under Settings > Android Notification Categories.
+ONESIGNAL_ANDROID_CHANNEL_ID=

examples/demo/lib/models/notification_type.dart

@@ -17,22 +17,22 @@ enum NotificationType {
     title: 'Sound Notification',
     body: 'This notification plays a custom sound',
     iosSound: 'vine_boom.wav',
-    androidChannelId: 'b3b015d9-c050-4042-8548-dcc34aa44aa4',
+    useAndroidChannel: true,
   );
 
   final String title;
   final String body;
   final String? bigPicture;
   final Map<String, String>? iosAttachments;
   final String? iosSound;
-  final String? androidChannelId;
+  final bool useAndroidChannel;
 
   const NotificationType({
     required this.title,
     required this.body,
     this.bigPicture,
     this.iosAttachments,
     this.iosSound,
-    this.androidChannelId,
+    this.useAndroidChannel = false,
   });
 }

examples/demo/lib/services/onesignal_api_service.dart

@@ -1,11 +1,26 @@
 import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
+import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 
 import '../models/notification_type.dart';
 import '../models/user_data.dart';
 
+const String _defaultAndroidChannelId = 'b3b015d9-c050-4042-8548-dcc34aa44aa4';
+
+String _resolveAndroidChannelId() {
+  String? envValue;
+  try {
+    envValue = dotenv.env['ONESIGNAL_ANDROID_CHANNEL_ID']?.trim();
+  } catch (_) {
+    envValue = null;
+  }
+  return (envValue != null && envValue.isNotEmpty)
+      ? envValue
+      : _defaultAndroidChannelId;
+}
+
 class OneSignalApiService {
   String _appId = '';
   String _apiKey = '';
@@ -36,8 +51,8 @@ class OneSignalApiService {
       if (type.iosSound != null) {
         body['ios_sound'] = type.iosSound;
       }
-      if (type.androidChannelId != null) {
-        body['android_channel_id'] = type.androidChannelId;
+      if (type.useAndroidChannel) {
+        body['android_channel_id'] = _resolveAndroidChannelId();
       }
 
       final response = await http.post(

examples/demo_pods/.env.example

@@ -1,2 +1,6 @@
 ONESIGNAL_APP_ID=your-onesignal-app-id # default app id: 77e32082-ea27-42e3-a898-c72e141824ef if empty
 ONESIGNAL_API_KEY=your-onesignal-api-key
+
+# Optional: Android Notification Channel ID for the WITH SOUND test notification.
+# Create one in your OneSignal dashboard under Settings > Android Notification Categories.
+ONESIGNAL_ANDROID_CHANNEL_ID=

examples/demo_pods/lib/models/notification_type.dart

@@ -17,22 +17,22 @@ enum NotificationType {
     title: 'Sound Notification',
     body: 'This notification plays a custom sound',
     iosSound: 'vine_boom.wav',
-    androidChannelId: 'b3b015d9-c050-4042-8548-dcc34aa44aa4',
+    useAndroidChannel: true,
   );
 
   final String title;
   final String body;
   final String? bigPicture;
   final Map<String, String>? iosAttachments;
   final String? iosSound;
-  final String? androidChannelId;
+  final bool useAndroidChannel;
 
   const NotificationType({
     required this.title,
     required this.body,
     this.bigPicture,
     this.iosAttachments,
     this.iosSound,
-    this.androidChannelId,
+    this.useAndroidChannel = false,
   });
 }

examples/demo_pods/lib/services/onesignal_api_service.dart

@@ -1,11 +1,26 @@
 import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
+import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:http/http.dart' as http;
 
 import '../models/notification_type.dart';
 import '../models/user_data.dart';
 
+const String _defaultAndroidChannelId = 'b3b015d9-c050-4042-8548-dcc34aa44aa4';
+
+String _resolveAndroidChannelId() {
+  String? envValue;
+  try {
+    envValue = dotenv.env['ONESIGNAL_ANDROID_CHANNEL_ID']?.trim();
+  } catch (_) {
+    envValue = null;
+  }
+  return (envValue != null && envValue.isNotEmpty)
+      ? envValue
+      : _defaultAndroidChannelId;
+}
+
 class OneSignalApiService {
   String _appId = '';
   String _apiKey = '';
@@ -36,8 +51,8 @@ class OneSignalApiService {
       if (type.iosSound != null) {
         body['ios_sound'] = type.iosSound;
       }
-      if (type.androidChannelId != null) {
-        body['android_channel_id'] = type.androidChannelId;
+      if (type.useAndroidChannel) {
+        body['android_channel_id'] = _resolveAndroidChannelId();
       }
 
       final response = await http.post(