Android Dagger2:使子作用域组件可以访问父组件依赖项
我有以下设置:Android Dagger2:使子作用域组件可以访问父组件依赖项,android,scope,dagger-2,Android,Scope,Dagger 2,我有以下设置: @ApplicationScope @Component( dependencies = {AppContextComponent.class, CertUtilsComponent.class, ServiceComponent.class, JobManagerComponent.class}) public interface ApplicationComponent extends AppContextComponent, CertUtil
@ApplicationScope
@Component(
dependencies = {AppContextComponent.class, CertUtilsComponent.class, ServiceComponent.class, JobManagerComponent.class})
public interface ApplicationComponent
extends AppContextComponent, CertUtilsComponent, ServiceComponent, JobManagerComponent {
void inject(MainActivity mainActivity); //honestly, I won't need this
}
我有以下子范围组件:
@PresenterScope
@Component(dependencies = {ApplicationComponent.class, PersistenceComponent.class})
public interface PresenterComponent
extends ApplicationComponent, PersistenceComponent {
void inject(HomePresenter homePresenter);
void inject(SendCertificateRequestInteractor sendCertificateRequestInteractor);
}
PersisterComponent persisterComponent = DaggerPersisterComponent.builder()
.jobManagerComponent(Injector.INSTANCE.getJobManagerComponent()) //this should be subcomponent
.realmComponent(realmComponent)
.repositoryComponent(repositoryComponent)
.persisterModule(new PersisterModule())
.build();
问题在于PersistenceComponent
具有以下组件作为其依赖项:
@Component(dependencies = {JobManagerComponent.class, RealmComponent.class, RepositoryComponent.class}, modules = {PersisterModule.class})
public interface PersisterComponent {
DummyCertPersister dummyCertPersister();
}
它使用JobManagerComponent
,这是应用程序组件的依赖项
不幸的是,此组件似乎不是从ApplicationComponent
继承的。我需要明确地跟踪这个组件,并像这样为构建者提供它
//INJECTOR
ApplicationComponent applicationComponent = DaggerApplicationComponent.builder()
.appContextComponent(appContextComponent)
.certUtilsComponent(certUtilsComponent)
.jobManagerComponent(jobManagerComponent)
.serviceComponent(serviceComponent)
.build();
this.jobManagerComponent = jobManagerComponent;
this.applicationComponent = applicationComponent;
this.certUtilsComponent = certUtilsComponent;
this.appContextComponent = appContextComponent;
this.serviceComponent = serviceComponent;
}
public ApplicationComponent getApplicationComponent() {
return applicationComponent;
}
public JobManagerComponent getJobManagerComponent() {
return jobManagerComponent;
}
并在构建持久性组件时通过getter提供:
@PresenterScope
@Component(dependencies = {ApplicationComponent.class, PersistenceComponent.class})
public interface PresenterComponent
extends ApplicationComponent, PersistenceComponent {
void inject(HomePresenter homePresenter);
void inject(SendCertificateRequestInteractor sendCertificateRequestInteractor);
}
PersisterComponent persisterComponent = DaggerPersisterComponent.builder()
.jobManagerComponent(Injector.INSTANCE.getJobManagerComponent()) //this should be subcomponent
.realmComponent(realmComponent)
.repositoryComponent(repositoryComponent)
.persisterModule(new PersisterModule())
.build();
我希望从ApplicationComponent
继承该JobManagerComponent
。我猜我需要将它变成一个@子组件
,并为它提供一个供应方法,但到目前为止,它还没有起作用(我没有一个生成器方法,但它仍然没有在作业管理器组件
中看到作业管理器
)
如果子组件依赖于
@Subcomponent
,我是否需要跟踪ApplicationComponent
的“子组件”呢?答案是,我在Dagger2中对组件如何工作的概念上是错误的
一个组件只有在子作用域中才能依赖另一个组件。具有多个组件依赖项的组件不能依赖作用域组件。这意味着它们不能有作用域模块;这也意味着它们根本不能使用作用域,除非模块保留对新实例的引用,否则您将每次注入时都会得到一个新实例。这很糟糕,根本不是你想要的
正确的方法是将同一作用域的每个模块绑定到同一个组件。这样,提供的依赖项在构造函数中是可访问的,并且在不同组件中共享同一模块也不会有问题
因此,这个问题的做法是完全错误的
哦……等我有时间的时候,我可以回答这个问题。