Android Dagger2缺少绑定无法提供ViewModel密钥

我正在尝试使用Dagger2和多绑定创建ViewModel的依赖项注入，但是我收到了这个错误，我无法使它工作，我尝试了下面的几个答案，但没有一个对我有帮助

这是我收到的错误：

SaveMyHeroApplicationComponent.java:8: 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.

我知道这个问题有几个问题，但我试了几个，没有一个对我有效

以下是我尝试阅读和检查的解决方案链接：

试着用一个例子

Dagger Android本身就是一个烂摊子，遵循一些模板不要走错方向很重要。也许您的方法也可以修复，但我建议您尝试更改您的模式：

自定义视图模型工厂应具有@Inject-in构造函数： 对于您的所有对-Activitiy/ViewModel和Fragment/ViewModel，您应该像这样添加模块，但您可以为所有对添加单个模块，这取决于您： 在Dagger组件中，您应该使用步骤3中的所有模块：

---

谢谢，我遵循了你的步骤+蓝图，我能够修复！

class SaveMyHeroApplication : DaggerApplication() {

    override fun applicationInjector(): AndroidInjector<out DaggerApplication> {
        return DaggerSaveMyHeroApplicationComponent.factory().create(this)
    }
}

@Singleton
@Component(modules = [AndroidInjectionModule::class, MainActivityModule::class])
interface SaveMyHeroApplicationComponent : AndroidInjector<SaveMyHeroApplication> {

    @Component.Factory
    interface Factory {
        fun create(@BindsInstance context: Context): SaveMyHeroApplicationComponent
    }
}

@Module(includes = [NetworkModule::class, HomeModule::class])
class MainActivityModule {

    @Provides
    fun provideViewModelFactoryProviders(
        providers: Map<Class<out ViewModel>, @JvmSuppressWildcards Provider<ViewModel>>
    ): ViewModelProvider.Factory = SaveMyHeroViewModelFactory(providers)
}

class SaveMyHeroViewModelFactory(
    private val providers: Map<Class<out ViewModel>, Provider<ViewModel>>
) : ViewModelProvider.Factory {

    override fun <T : ViewModel> create(modelClass: Class<T>): T =
        requireNotNull(getProvider(modelClass).get()) {
            "Provider for $modelClass returned null"
        }


    private fun <T : ViewModel> getProvider(modelClass: Class<T>): Provider<T> =
        try {
            requireNotNull(providers[modelClass] as Provider<T>) {
                "No ViewModel provider is bound for class $modelClass"
            }
        } catch (error: ClassCastException) {
            error("Wrong provider type registered for ViewModel type $error")
        }
}

@Module(includes = [HomeModule.ProvideViewModel::class])
abstract class HomeModule {

    @ContributesAndroidInjector(modules = [InjectViewModel::class])
    abstract fun bind(): HomeFragment

    @Module
    class ProvideViewModel {

        @Provides
        @IntoMap
        @ViewModelKey(HomeViewModel::class)
        fun provideHomeViewModel() = HomeViewModel()
    }

    @Module
    class InjectViewModel {

        @Provides
        fun provideHomeViewModel(
            factory: ViewModelProvider.Factory,
            target: HomeFragment
        ) = ViewModelProvider(target, factory).get(HomeViewModel::class.java)
    }
}

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

 kotlin_version = ‘1.3.72'
 dagger_version = ‘2.27’

 gradle:3.6.3

class SaveMyHeroViewModelFactory @Inject constructor(
    private val creators:  @JvmSuppressWildcards Map<Class<out ViewModel>, Provider<ViewModel>>
) : ViewModelProvider.Factory {
.......

@Module
abstract class ViewModelBuilderModule {
    @Binds
    abstract fun bindViewModelFactory(factory: SaveMyHeroViewModelFactory): ViewModelProvider.Factory
}

@Module
abstract class HomeModule {

    @ContributesAndroidInjector(modules = [ViewModelBuilderModule::class])
    internal abstract fun bind(): HomeFragment

    @Binds
    @IntoMap
    @ViewModelKey(HomeViewModel::class)
    internal abstract fun provideHomeViewModel(viewModel: HomeViewModel): ViewModel
}

@Singleton
@Component(modules = [AndroidSupportInjectionModule::class, HomeModule::class, ...])
interface SaveMyHeroApplicationComponent : AndroidInjector<SaveMyHeroApplication> {

    @Component.Factory
    interface Factory {
        fun create(@BindsInstance context: Context): SaveMyHeroApplicationComponent
    }
}