使用依赖注入编译问题

Question

从 java 进行 Kotlin 转换时出错，此项目正在测试 Github Api 并在 recyclerview.I 中显示数据得到编译错误，我无法解决 Dagger2，它在 Java 中工作，但是当转换为 Kotlin 时，我在运行时遇到编译错误。似乎是将 api 方法注入视图模型我已尝试跟踪错误然后清理并重建应用程序我也尝试过使缓存无效并重新启动，但似乎从 Java 转换为 Kotlin 时出现错误。任何帮助，将不胜感激。这是我的 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)
 }
}

我的组件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
 }
}

还有我的 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
    }
 }
}

这是我得到的错误：

[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

您的错误清楚地表明：

[Dagger/MissingBinding] repos.network.RepoRepository cannot be provided without an @Inject constructor or an @Provides-annotated method.

您没有为 RepoRepository 定义构造函数 class。

它应该看起来像这样：

class RepoRepository @Inject constructor(private val repoService: GithubRepos) {//the rest of your code here}

这也适用于您的视图模型 class。如果您正在使用 android ViewModel 架构组件，我建议您阅读此 article，其中解释了如何将其与 Dagger2 一起使用。

希望这对您有所帮助。

使用依赖注入编译问题

Issue compiling with dependency injection

kotlin

dagger-2