Question

我得到带有以下代码的MissingBinding：

class AnActivityComponent @Inject constructor(activity: Activity)

@Module
abstract class MainActivityModule {
    @ContributesAndroidInjector
    abstract fun contributeAndroidInjector(): MainActivity

    @Binds
    abstract fun bindActivity(mainActivity: MainActivity): Activity
}

@Module
abstract class AppModule(app: App) {
    @Binds
    abstract fun bindApplication(app: App): Application
}

@Component(modules = [AppModule::class, AndroidInjectionModule::class, MainActivityModule::class])
interface AppComponent : AndroidInjector<App> {
}

但是，如果我更改

class AnActivityComponent @Inject constructor(activity: Activity)

到

class AnActivityComponent @Inject constructor(activity: MainActivity)

它工作正常。我在活动模块中绑定了活动，那又是什么问题？

Answer 1

好吧，事实证明@ContributesAndroidInjector不包含在查找中声明的模块，因此您必须更好地组织代码：

class AnActivityComponent @Inject constructor(activity: Activity)

@Module
abstract class ActivitiesModule {
    @ContributesAndroidInjector(modules = [MainActivityModule::class])
    abstract fun contributeAndroidInjector(): MainActivity
}

@Module
abstract class MainActivityModule {
    @Binds
    abstract fun bindActivity(mainActivity: MainActivity): Activity
}

@Module
abstract class AppModule(app: App) {
    @Binds
    abstract fun bindApplication(app: App): Application
}

@Component(modules = [AppModule::class, AndroidInjectionModule::class, ActivitiesModule::class])
interface AppComponent : AndroidInjector<App> {
}

与活动相关的依赖关系的问题：获取Dagger / MissingBinding

1 个答案: