I am using navigation component for jetpack compose in my app like this:
@Composable
fun FoodiumNavigation() {
val navController = rememberNavController()
NavHost(
navController = navController,
startDestination = Screen.Main.route,
) {
composable(Screen.Main.route) {
MainScreen(navController)
}
...
}
}
And I am getting viewmodel in my MainScreen composable like this:
@Composable
fun MainScreen(navController: NavController) {
val mainViewModel: MainViewModel = viewModel()
...
}
which is giving me a runtime exception as Cannot create an instance of class com.package.main.MainViewModel.
Here, I am stating that this only happens while using navigation component, i.e. everything was working fine and mainViewModel was successfully instantiated before using navigation component in my app.
The MainViewModel is like this:
@ExperimentalCoroutinesApi
@HiltViewModel
class MainViewModel @Inject constructor(private val postRepository: PostRepository) :
ViewModel() {
private val _postsLiveDataState = MutableLiveData<UiState<List<Post>>>()
val postLiveState: LiveData<UiState<List<Post>>> = _postsLiveDataState
init {
getPostsState()
}
private fun getPostsState() {
viewModelScope.launch {
postRepository.getAllPosts()
.onStart { _postsLiveDataState.value = UiState(loading = true) }
.map { resource -> UiState.fromResource(resource) }
.collect { state -> _postsLiveDataState.value = state }
}
}
}
