I want that firebase sends a notification to my app when my database is updated. For example when I write a new entry in this database, the app should receive a notification, even if the app is closed.
Since you are using Firebase I would suggest you to use the feature Cloud Messaging. You can send a Data Message and the application knows that the database was updated. Check more info about it here: https://firebase.google.com/docs/cloud-messaging/concept-options
Related
I'm creating an ecommerce app and I want to send promotional notifications to users from firebase cloud messaging. I want to show all the notifications in recycler view in notification screen using adapter can anyone tell how do I save all incoming notifications and display them in notification screen
If you want to show all notifications you need to save those in
local database when you receive and fetch all on required screen.
You can use Room database for the same.
You can ask the backend developer to save all notifications at
backend side and fetch those by an API.
Approach 1
See If you are sending a notification from the firebase console, Then you need to save that notification in the local DB While It receives in Mobile Firebase Messaging Service Class. (but It's not a good approach, Because user loss notification in case of clear data for app or reinstall app)
Approach 2
If you are sending notifications using some API or firebase function Then you can create one collection of Notifications and save notifications every time while sending And Fetch notifications from the same collection.
Currently i am working in a project which receive Push notification using FCM, i am receiving notification quite well.
In next part of project , i have to make an ativity which will display all the previous notification. kind of action center.
any clue will help me a lot.
For getting previous notifications, you have to save your notification in your database before sending the push notification.
After that you can fetch all the previous notification's data from your database.
You can use firebase realtime database or firebase cloud firestore database to save the data.
I see here is event triggers https://firebase.google.com/docs/functions/database-events for RTDB and I watch onCreate() method.
onCreate()`, which triggers when new data is created in the Realtime
Database.
When I create new insert into RTDB in this method I can notify user about new insert into database.
But my question is now I can make here notification and all mobile device in same time get notification?
Why I need to use FCM. With FCM I can choose which mobile device get notification and many more features about notification?
The Firebase Database client in your app is (normally) only active when the app is running and in the foreground. So it can only receive the new data, while the user is actively using your app.
The Firebase Cloud Messaging SDK includes a service that is also listening for messages when the app is not in the foreground. That means that with FCM you can also notify the users when they are not actively using your app.
It is quite common to use a combination of the Firebase Database and Cloud Messaging:
If one user changes the state, write that change to the database.
Then use FCM to notify the other users that "something" has changed.
Finally when the other users open the app again, the app gets the latest state from the database.
Is it possible to generate a push notification (if the app is not in the foreground) on firebase db changes? I started coding an android app.
Firebase provides a tool called Cloud Functions.
With this, you can listen to your Firebase Database and send Notifications without the need for an external server :)
See : https://firebase.google.com/docs/functions/use-cases
To do it in a simple way, you can use a Service, in this Service you can set a Listener on a ref in your firebase DB when the event is triggered you can create a notify and show it to the user.
This is a very simple tutorial:
https://www.simplifiedcoding.net/android-push-notification-tutorial-using-firebase/
There certainly is. Just have your Android app write the notification request into the database.
Sending device-to-device notifications is not a supported scenario in Firebase Cloud Messaging (see this answer), so you'll need a server component for that. For an example of how to send a push notification in nodejs, see this answer.
I am using Google App engine for the database. My idea is that whenever someone, for an instance, signs up for the app - then all users must get a notification that a new member has been added. How can we do this?
For that you should read about GCM. GCM provides a simple way through which you can send notification to your users through your server. You can read about GCM here:
https://developers.google.com/cloud-messaging/