Issue compiling with dependency injection - kotlin

Question

Error with Kotlin conversion from java, this project is testing Github Api and displaying data in recyclerview.I get the a compile error which i cannot workout for Dagger2, it worked in Java but when converting to Kotlin i get a compile error at runtime.
It seems to be with injecting an api method into the view model
i have tried following the error then cleaning and rebuilding the app
I have also tried invalidating caches and restarting but seems there is an error with the conversion into Kotlin from Java. Any help would be appreciated.
Here is my class:
class RepoRepository {
private lateinit var repoService: GithubRepos
#Inject
fun RepoRepository(repoService: GithubRepos) {
this.repoService = repoService
}
fun getRepositories(): Single<List<Repo>> {
return repoService.getRepos()
}
fun getSingleRepo(owner: String, name: String): Single<Repo> {
return repoService.getSingleRepo(owner, name)
}
}
My component class:
#Singleton
#Component(modules = arrayOf(NetworkModule::class))
interface AppComponent {
/**
* inject required dependencies into MainActivityListViewModel
*/
fun inject(mainActivityListViewModel: MainActivityListViewModel)
#Component.Builder
interface Builder {
fun build(): AppComponent
fun networkModule(networkModule: NetworkModule): Builder
}
}
And my ViewModel:
class MainActivityListViewModel : BaseViewModel() {
private lateinit var repoRepository: RepoRepository
private var disposable: CompositeDisposable? = null
private val repos = MutableLiveData<List<Repo>>()
private val repoLoadError = MutableLiveData<Boolean>()
private val loading = MutableLiveData<Boolean>()
#Inject
fun ListViewModel(repoRepository: RepoRepository) {
this.repoRepository = repoRepository
disposable = CompositeDisposable()
fetchRepos()
}
fun getRepos(): LiveData<List<Repo>> {
return repos
}
fun getError(): LiveData<Boolean> {
return repoLoadError
}
fun getLoading(): LiveData<Boolean> {
return loading
}
private fun fetchRepos() {
loading.value = true
disposable?.add(repoRepository.getRepositories()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribeWith(object :
DisposableSingleObserver<List<Repo>>() {
override fun onSuccess(value: List<Repo>) {
repoLoadError.value = false
repos.value = value
loading.value = false
}
override fun onError(e: Throwable) {
repoLoadError.value = true
loading.value = false
}
}))
}
override fun onCleared() {
super.onCleared()
if (disposable != null) {
disposable!!.clear()
disposable = null
}
}
}
this is error i am getting:
[Dagger/MissingBinding] repos.network.RepoRepository cannot be
provided without an #Inject constructor or an #Provides-annotated
method. This type supports members injection but cannot be
implicitly provided.
public abstract repos.network.RepoRepository
repoRepository();
^
repos.network.RepoRepository is provided at
components.AppComponent.repoRepository() e: repos/di/components/AppComponent.java:19: error:
[Dagger/MissingBinding] repos.network.RepoRepository cannot be
provided without an #Inject constructor or an #Provides- annotated
method. This type supports members injection but cannot be
implicitly provided.
^
repos.network.RepoRepository is injected at
repos.viewmodels.MainActivityListViewModel.ListViewModel(repoRepository)
repos.viewmodels.MainActivityListViewModel is injected at
repos.di.components.AppComponent.inject(repos.viewmodels.MainActivityListViewModel)

Answer 1

Your error clearly says:
[Dagger/MissingBinding] repos.network.RepoRepository cannot be provided without an #Inject constructor or an #Provides-annotated method.
You didn't define constructor for your RepoRepository class.
It should look something like this:
class RepoRepository #Inject constructor(private val repoService: GithubRepos) {//the rest of your code here}
This goes for your viewmodel class as well.
If you are using android ViewModel architecture component i suggest you read this article which explains how to use it with Dagger2.
Hope this helps.