Dagger2地图多重绑定：我为此java.util.Map 用于视图模型地图多重绑定提供什么？

Question

我想通过匕首提供viewmodel，所以我使用的是具有地图多重绑定的ViewModelProviderFactory。这是ViewModelProviderFactory.kt的代码：

@Singleton
class ViewModelProviderFactory @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
}

这是我的ViewModelFactoryModule.kt：

@Module
abstract class ViewModelFactoryModule {

    @Binds
    abstract fun bindViewModelFactory(providerFactory: ViewModelProviderFactory) : ViewModelProvider.Factory

}

这是我的ViewModelKey.kt：

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

}

我想将AuthViewModel添加到名为Login的活动中，这是我的AuthViewModelModule.kt：

@Module
abstract class AuthViewModelModule {
    @Binds
    @IntoMap
    @ViewModelKey(AuthViewModel::class)
    abstract fun bindAuthViewModel(viewModel : AuthViewModel) : ViewModel
}

这是Login.kt：

class Login : AppCompatActivity() {
    @Inject
    lateinit var providerFactory : ViewModelProviderFactory

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val api = Api.instance

        val repository = UserRepository(api)

        val factory = AuthViewModelFactory(repository)

        val binding: ActivityLoginBinding =
            DataBindingUtil.setContentView(this, R.layout.activity_login)

        val viewModel = ViewModelProvider(this, providerFactory).get(AuthViewModel::class.java)

        binding.viewmodel = viewModel

    }

}

这是我的AppComponent.kt

@Singleton
@Component(
    modules = [
        AndroidSupportInjectionModule::class,
        ActivityBuildersModule::class,
        AppModule::class,
        ViewModelFactoryModule::class
    ]
)
interface AppComponent : AndroidInjector<BaseApplication> {

    @Component.Builder
    interface Builder {

        @BindsInstance
        fun application(application: Application) : Builder

        fun build() : AppComponent
    }
}

和我的ActivityBuildersModule.kt：

@Module
abstract class ActivityBuildersModule {

    @ContributesAndroidInjector(
        modules = [AuthViewModelModule::class]
    )
    abstract fun contributeLogin() : Login
}

代替注入所有这些，我因没有提供而出错，这是我现在得到的错误：

java.util.Map<java.lang.Class<? extends androidx.lifecycle.ViewModel>,javax.inject.Provider<androidx.lifecycle.ViewModel>> cannot be provided without an @Provides-annotated method.
java.util.Map<java.lang.Class<? extends androidx.lifecycle.ViewModel>,javax.inject.Provider<androidx.lifecycle.ViewModel>> is injected at
com.kreeti.gogal.viewmodels.ViewModelProviderFactory(viewModels)
com.kreeti.gogal.viewmodels.ViewModelProviderFactory is injected at
com.kreeti.gogal.di.ViewModelFactoryModule.bindViewModelFactory(providerFactory)
androidx.lifecycle.ViewModelProvider.Factory is injected at
com.kreeti.gogal.ui.auth.Login.providerFactory
com.kreeti.gogal.ui.auth.Login is injected at

Answer 1

您应该注入viewModel类的构造方法例：@注入公共AuthViewModel（）{}它应该工作正常。