Dagger/MissingBinding java.util.Map< java.lang.Class&lt ;?扩展ViewModel>，Provider< ViewModel>>没有@Provides注释的方法无法提供 [英] Dagger/MissingBinding java.util.Map<java.lang.Class<? extends ViewModel>,Provider<ViewModel>> cannot be provided without an @Provides-annotated method

问题描述

这就是我要提供我的ViewModelFactory的方式:

This is how I'm trying to provide my ViewModelFactory:

@Suppress("UNCHECKED_CAST")
@Singleton
class ViewModelFactory @Inject constructor(
    private val viewModels: MutableMap<Class<out ViewModel>, Provider<ViewModel>>
) : ViewModelProvider.Factory {

    override fun <T : ViewModel?> create(modelClass: Class<T>): T = viewModels[modelClass]?.get() as T
}

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
@kotlin.annotation.Retention(AnnotationRetention.RUNTIME)
@MapKey
annotation class ViewModelKey(val value: KClass<out ViewModel>)

这就是我绑定ViewModelFactory的方式:

@Suppress("unused")
@Module
abstract class ViewModelModule  {
    @Binds
    internal abstract fun bindViewModelFactory(factory: ViewModelFactory): ViewModelProvider.Factory

    @Binds
    @IntoMap
    @ViewModelKey(MainViewModel::class)
    internal abstract fun mainViewModel(viewModel: MainViewModel): ViewModel
}

我在构建过程中收到以下错误:

I'm receiving the following error during build:

di/Injector.java:9: error: [Dagger/MissingBinding] java.util.Map<java.lang.Class<? extends androidx.lifecycle.ViewModel>,javax.inject.Provider<androidx.lifecycle.ViewModel>> cannot be provided without an @Provides-annotated method.

我正试图从我的Activity接收ViewModelFactory:

@Inject
lateinit var viewModelFactory: ViewModelProvider.Factory

推荐答案

多挖了一点之后，我发现了问题所在. 它与我使用的代码完全无关.关于Kotlin 1.3.30.

After digging a little bit more I found the issue. It's completely un-related to the code I'm using. It regards Kotlin 1.3.30.

此处有关此信息的更多信息.

Here some more information about it.

降级为Kotlin 1.3.21解决了该问题.

这篇关于Dagger/MissingBinding java.util.Map< java.lang.Class&lt ;?扩展ViewModel>，Provider< ViewModel>>没有@Provides注释的方法无法提供的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！