For anyone trying to use compose and hilt to injec...

# compose

[Abhishek Dewan]

For anyone trying to use compose and hilt to inject viewModels along with compose nav host composable, here is a github issue to be aware of https://github.com/google/dagger/issues/2166#issuecomment-769162910. In short, if you have a navHost that defines routes then viewModel inject stops working in those routes. For e.g

NavHost(navController = navController, startDestination = "splash") {
            composable("splash") {
                SplashScreen(navController)
            }
            composable("home") {
                HomeScreen()
            }
        }

and you SplashScreen was defined somewhat like this

@Composable
fun SplashScreen(navController: NavHostController) {
    
    val viewModel: SplashViewModel = viewModel()

The injection will not work if your SplashScreenViewModel takes non zero constructor params. In order to fix this you need to inject the viewModel somewhat like this

val viewModel: SplashViewModel = viewModel(
        factory = HiltViewModelFactory(
            LocalContext.current,
            navController.getBackStackEntry("splash")
        )
    )

and this is possible by using the androidx.hilt:hilt-navigation:1.0.0-alpha03 library.

I spent the last hour trying to debug why despite everything being right, the injection wouldn’t work 😄

[Ian Lake]

Using Hilt with Navigation Compose should be even easier later this week (if all goes according to plan): https://kotlinlang.slack.com/archives/CJLTWPH7S/p1614619457323100?thread_ts=1614601227.289300&cid=CJLTWPH7S