在Dagger 2中创建依赖组件

Creating dependent component in dagger 2

我有一个带有AppComponent的项目可以构建和运行。现在，我想向项目添加另一个依赖组件。

我添加了范围注释

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@Scope
@Retention(AnnotationRetention.RUNTIME)
annotation class MyTestScope

然后我为其创建一些类和一个模块

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class A {
fun get() = 1
}

@Module
class TestModule {
@Provides
@MyTestScope
fun provideA(): A {
return A()
}
}

像这样添加从属组件后

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@MyTestScope
@Component(dependencies = [AppComponent::class],
modules = [TestModule::class])
interface DependentComponent {
@Component.Builder
interface Builder {
@BindsInstance
fun appComponent(component: AppComponent): Builder
fun build(): DependentComponent
}

fun inject(application: Application)
}

如果我尝试构建它，则会看到下一个错误
error: @Component.Builder is missing setters for required modules or components: [AppComponent]

这是我的AppComponent的外观

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@Singleton
@Component(modules = [
AndroidInjectionModule::class,
ActivityModule::class,
// etc ....
])
interface AppComponent {
@Component.Builder
interface Builder {
@BindsInstance
fun language(language: Language): Builder
@BindsInstance
fun appContext(appContext: Context): Builder
fun build(): AppComponent
}

fun inject(application: Application)
}

有什么想法吗？

在为依赖组件创建构建器时，切勿使用@BindsInstance

标记主要组件的设置器

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@MyTestScope
@Component(dependencies = [AppComponent::class],
modules = [TestModule::class])
interface DependentComponent {
@Component.Builder
interface Builder {
fun appComponent(component: AppComponent): Builder
fun build(): DependentComponent
}

fun inject(application: Application)
}