How to Implement MVI in Android using just Java

Before you click! This is in Kotlin -> https://tech.olx.com/mvi-architecture-in-android-a-simple-livedata-based-approach-b4b23896fd32 But if you actually look at the code snippets there is not a single line that doesn't have an obvious Java counter part. There is not a single Kotlin exclusive item like Flow, Scoping, Coroutine anywhere.

You don't need to learn Kotlin to understand it, just read it.

The article explains MVI as a modified way to use a MVVM.

It has 2 (ViewState/ViewEffect) components that are observed by the view (Fragment/Activity)

It has 1 (ViewEvent) component that is used by the view to trigger changes in the observed components above.

ViewState : It contains your data, like a List, like a boolean that determines if something is enabled, etc... When there is a change in any state data, like an update to the List, the observer receives everything, and updates everything.

ViewEffect : These are one off "effects" like starting an animation, making a toast. You will update this with new data when you not concerned about the state of the effect. Like I don't care if there is another toast on the screen, atm. Just make a new one with new information, and show it.

ViewEvent : This allows the ViewModel to receive events from the view and start the "update" process. If a button is clicked in the view all the view would do is send a ViewEvent to the ViewModel stating what has been clicked. Then the ViewModel updates the ViewState/ViewEffect based on the ViewEvent received, which then propagates to the view.