Push notifications (FCM) in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Firebase Cloud Messaging (FCM)?

FCM is a free service by Google that lets apps send notifications and messages to users across Android, iOS, and web platforms.

beginner

Which Flutter package is commonly used to integrate FCM?

The firebase_messaging package is used to add Firebase Cloud Messaging support in Flutter apps.

intermediate

How do you request permission for notifications on iOS in Flutter?

Use FirebaseMessaging.instance.requestPermission() to ask the user for notification permissions on iOS devices.

beginner

What is a device token in FCM?

A device token is a unique ID that FCM uses to send notifications to a specific device.

intermediate

How can you handle a notification when the app is in the foreground?

Use FirebaseMessaging.onMessage.listen() to listen for messages and show custom UI or alerts when the app is open.

Which package do you add to your Flutter app to use Firebase Cloud Messaging?

A flutter_local_notifications

B firebase_messaging

C http

D firebase_auth

The firebase_messaging package is specifically designed to integrate FCM in Flutter apps.

What must you do on iOS before receiving push notifications?

A Request user permission for notifications

B Enable background fetch

C Install Google Play Services

D Nothing, it works automatically

iOS requires explicit user permission to show notifications, so you must request it.

What does the device token represent in FCM?

A A unique identifier for the device to receive messages

B The app version number

C The user's email address

D The Firebase project ID

The device token uniquely identifies the device for sending targeted notifications.

Which method listens for messages when the app is running in the foreground?

A FirebaseMessaging.subscribeToTopic()

B FirebaseMessaging.getInitialMessage()

C FirebaseMessaging.onMessage.listen()

D FirebaseMessaging.requestPermission()

onMessage.listen() handles incoming messages while the app is open.

What is the first step to set up FCM in a Flutter app?

A Request notification permission

B Write notification UI code

C Create a new Flutter widget

D Add firebase_messaging package and configure Firebase project

You must add the package and connect your app to Firebase before handling notifications.

Explain the steps to receive push notifications using FCM in a Flutter app.

Think about setup, permissions, and message handling.

Describe how to handle a notification when the app is open versus when it is closed.

Consider different app states and corresponding listeners.