I am finally starting with Navigation but I am stuck with a basic problem:

Scaffold(
            scaffoldState = scaffoldState,
            drawerContent = {
                HomePageDrawer()
            },

For HomePageDrawer() I get : "No value passed for parameter 'navController'". What am I supposed to put for parameter navController? Whatever I try gives me a nullpointer... Basically I have some items in my drawer and I want to navigate to other screens from them...

The Getting Started part of the guide (https://developer.android.com/jetpack/compose/navigation#getting-started) states that you should be using

rememberNavController()

outside of your

Scaffold

I'm using it in my navigation composable:

@Composable
fun ApplicationNavigation() {
    val navController = rememberNavController()
    androidx.navigation.compose.NavHost(
        navController = navController,
        startDestination = "homepage"
    ) {
        composable("homepage") {
            HomePage()
        }
        composable("drawer"){
            HomePageDrawer(navController)
        }
        composable("placeholder"){
            PlaceHolder()
        }
    }

But how can I refer to it in my HomePage Scaffold? I'm a bit confused.

Just pass in

navController

You could also consider passing a lambda instead of passing the

navController

, that way you can keep all navigation related code in one place and not pass the

navController

around

@Nikola Drljaca Thanks for this, I'm interested in your idea. Would you be able to show me how it would look, if you have the time? Maybe with my example above?

Well, here is a quick example of something thats similar to what I use. For your example, I think you can pass the lambda down your composable tree to wherever you need to call

navigate()

. Maybe the parent of the scaffold can have a lambda and pass it to the

HomePageDrawer()

. Anyway, here's a gist https://gist.github.com/nikolaDrljaca/06013137c325638ac6b71ca3ac76c681

Thanks for this, really appreciate it

Yep, that's actually the recommended practice to make your composables separately testable (from a bit farther down that exact same page I linked earlier): https://developer.android.com/jetpack/compose/navigation#testing

Oh excellent, thanks, I really need to start reading the doc more carefully! 😉