Can I pass a string from a activity to another one but still get it update when the original updated?

Question

I get score from firebase in GameActivity and then pass it to ScoreActivity using bundle I want to update score in my app realtime when database changed, how can I achieve it?

Thank you.

Answer 1

According to this comment:

The score that you get in the GameActivity is constantly changing and you want to get real-time updates about the score in ScoreActivity?

To get real-time updates about a property that is constantly changing, you need to attach a real-time listener in the second activity as well.

According to the official documentation:

To read data at a path and listen for changes, use the addValueEventListener() method to add a ValueEventListener to a DatabaseReference.

Simply passing an object through an Intent or Bundle doesn't provide this real-time feature.

Since you didn't select a tag for a particular database, I'll also show you how to achieve this in the case of Cloud Firestore, where to listen for real-time updates you should use addSnapshotListener() on DocumentReference or on a CollectionReference object.

So don't be afraid to use multiple listeners, all queries are pipelined over a single connection.