android-pagination-example | Example project for the Android Jetpack | Android library

I am following the approach described in this post (the corresponding repository can be found here) to use the Paging library in order to partially load data from my Firestore database. Instead of making use of a different activity (as is done in the original post), I put the code in a Fragment.

In my DataSource, the loadInitial function gets called in which we subscribe to the results. Once the results are available, calling callback.onResult with as argument the newly retrieved data does not reach the adapter. After stepping in and through the callback.onResult function, the following exception occurs in the onNext method: