How to collapse/group expo notifications

Question

Hello everybody

I'm currently developing an application that uses expo for push notifications. This app includes a chat feature that notifies the user of each message. The real problem is that these notifications are not collapsing immediately so the user gets a lot of notifications before android automatically decides to collapse.

Here's what is happening.

[App] John Doe
 Hello dude.
[App] John Doe
 How are you?
[App] John Doe
 Pay me!!!

The expected behaviour

[App] John Doe
  Hello dude
  How are you?
  Pay me!!!

Answer 1

It seems like IOS automatically group all your App notifications into one thread. However, on Android you need to set notification.androidMode to collapse, which is not set by default.

Take a look at current documentation: https://docs.expo.dev/versions/latest/config/app/#androidmode

app.json

Path: notification.androidMode
Type: enum

Show each push notification individually (default) or collapse into one (collapse).

That will only work in standalone app, nor in Expo Go.