Firebase and OneSignal: Push Notification Setup Failing on Android in Flutter

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I have configured both Firebase and OneSignal in my Flutter app, yet it neither receives push notifications nor prompts for notification permission.

I double-checked the setup on the OneSignal dashboard and Firebase console, but the app still doesn’t work as expected. Any suggestions on what might be missing or causing this issue?

Flutter version: 3.22.3
onesignal_flutter: ^5.2.9

DART
void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Initialize Firebase
  await Firebase.initializeApp();
  configureOneSignal();

  runApp(const MyApp());
}

// Configure OneSignal SDK
void configureOneSignal() {
  // Enable verbose logging for development
  OneSignal.Debug.setLogLevel(OSLogLevel.verbose);

  // Initialize OneSignal with the app ID
  OneSignal.initialize("b38128ff-0561-499c-ab67-87fb6c3b9911");

  // Request notification permissions
  OneSignal.Notifications.requestPermission(true).then((granted) {
    if (granted) {
      debugPrint("Notification permission granted.");
    } else {
      debugPrint("Notification permission denied.");
    }
  });
}

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

Here are a few things to check:

Native Platform Setup
- iOS:
  - Verify that you’ve enabled push notifications and added the proper capabilities (push notifications and background modes) in Xcode.
  - Make sure you’ve uploaded your APNs certificate or key to both Firebase (if you plan to use it) and OneSignal if required by your setup.
- Android:
  - Confirm that the Firebase configuration file (google-services.json) is in the correct location (typically app/).
  - Check that your AndroidManifest.xml includes the proper metadata and permissions for both Firebase and OneSignal.
OneSignal SDK Initialization
- Double‑check that you’re using the correct and updated initialization method. Some versions of the OneSignal Flutter SDK changed API calls (for example, using OneSignal.shared.setAppId instead of OneSignal.initialize). Ensure that the method you’re using is correct for version 5.2.9.
Test Environment
- On Android, real devices (not emulators) are generally needed to test push notifications.
- On iOS, if you’re testing in a simulator, note that push notifications may not be delivered.
Interplay with Firebase
- Although you’re initializing Firebase, make sure that its setup isn’t interfering with OneSignal (especially if you’re not using Firebase Cloud Messaging directly for delivery).
- Confirm that both services have been configured properly in their respective consoles.
Permission Prompt Behavior
- On platforms like Android (pre-13) the notification permission prompt may not appear because notifications are enabled by default. On iOS, the prompt only appears if your configuration (and your APNs setup) is complete.

Review these areas and adjust your native configuration files or update your OneSignal initialization code if needed. Often the issue comes down to missing native settings or discrepancies in the initialization API.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by NeptunianHunter169 • 1 month ago

Paste this code

JAVASCRIPT
OneSignal.Debug.setLogLevel(OSLogLevel.verbose);
OneSignal.initialize("b38128ff-0561-499c-ab67-87fb6c3b9911");
OneSignal.Notifications.requestPermission(true);

Before runApp(const MyApp());

Here is a video for better understanding

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Firebase and OneSignal: Push Notification Setup Failing on Android in Flutter

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