Hilt中的组件依赖项

Question

您好，我有dagger2的经验，但我试图获得一些Hilt的经验，所以我从演示应用程序开始，将演示从dagger2迁移到Hilt。在我的Dagger应用程序中，我有两个组件ApplicationComponent和ActivityComponent。ActivityComponent依赖于ApplicationComponent，所以我编写ActivityComponent如下：-

@ActivityScope
@Component(
    dependencies = [ApplicationComponent::class],
    modules = [ActivityModule::class]
)
interface ActivityComponent {
    fun inject(dummyActivity: DummyActivity)
    fun inject(dummyActivity2: DummyActivity2)
}

所以我认为我可以做以下事情，因为ActivityComponent是SingletonComponent/ApplicationComponent的子级，所以ActivityComponent可以访问ApplicationComponent中的任何绑定：-

@Module
@InstallIn(ApplicationComponent::class)
class  ApplicationModule {


    @Provides
    @Singleton
    fun provideDispatcherProvider(): DispatcherProvider = FlowDispatcherProvider()

    @Provides
    @Singleton
    fun provideSharedPreferences(@ApplicationContext application: Application): SharedPreferences =
        application.getSharedPreferences("project-prefs", Context.MODE_PRIVATE)

   
    @Provides
    @Singleton
    fun provideNetworkHelper(@ApplicationContext application: Application): NetworkHelper = NetworkHelper(application)

@Provides
@Singleton
fun provideNetworkService(@ApplicationContext application: Application): NetworkService =
        Networking.create(
            BuildConfig.USERNAME,
            BuildConfig.PASSWORD,
            BuildConfig.BASE_URL,
            application.cacheDir,
            10 * 1024 * 1024 // 10MB
        )

}


@Module
@InstallIn(ActivityComponent::class)
class ActivityModule {


    @Provides
    @ActivityScoped
    fun provideMyHelper(
        dispatcherProvider: DispatcherProvider,
        networkHelper: NetworkHelper
       ):MyHelper =  MyHelper(dispatcherProvider, networkHelper)


}

class MyHelper
    (
    private val dispatcherProvider: DispatcherProvider,
    private val networkHelper: NetworkHelper
) {

}

@ActivityScoped
@AndroidEntryPoint
class DummyActivity(): AppCompatActivity() {

    @Inject
    lateinit var myhelper: MyHelper
}

但是当我尝试构建这段代码时，我得到了：-

error: [Dagger/MissingBinding] @com.mypackage.ApplicationContext android.app.application cannot be provided without an @Provides-annotated method.
  public abstract static class SingletonC implements MyApplication_GeneratedInjector,
                         ^
      @com.mypackage.ApplicationContext android.app.Application is injected at
          mypackage.module.ApplicationModule.provideNetworkHelper(application)
      com.mypackage.NetworkHelper is injected at
          com.mypackage.ActivityModule.provideMyHelper(�, networkHelper)
      com.mypackage.MyHelper is injected at
          com.mypackage.DummyActivity.myhelper
      com.mypackage.DummyActivity is injected at
      com.mypackage.DummyActivity.myhelper

Answer 1

显然您没有正确导入ApplicationContext限定符，它应该是dagger.hilt.android.qualifiers.ApplicationContext。