Hi guys , I was exploring MVVM with jetpack compos...

# android

[Debdut Saha]

Hi guys , I was exploring MVVM with jetpack compose. But want to understand how to deal with side effects in compose?

[jefbit]

This should be a good starting point https://developer.android.com/jetpack/compose/side-effects

[Debdut Saha]

Bro I know side effects in compose. Just wanted to know how to emit conditional side effects from view model to view such as showing snackbar doing navigation etc.

[jefbit]

well you could use something like a sharedflow to handle one offs for different EventStates , ex navigation, snackbar

[Chrimaeon]

So if you use a view model, there is not need to use compose side effects. Just emit the new “state” from your viewmodel.

[Chrimaeon]

Have a look at the “now in android” github repo, it’s a very good source for such questions.

[Debdut Saha]

But showing a snackbar going to a next screen is this really required to be present in the ui state?

[Chrimaeon]

A snack bar is usually tied to a scaffold - so actually the snack bar is a UI state for the scaffold.

[Bill Cole]

Of course your composables will observe some state object provided by the viewmodel. To show a snackbar, for instance, you'll use a LaunchedEffect with the view state field as the key such that it will update whenever that field is updated.

[Bill Cole]

Alternatively, your viewmodel can own and expose the actual state object that your composables observe.