在一个对象中来自两个不同组件的两个@Injects [英] Two @Injects in one object but from two different Components

问题描述

我有：

@Inject
AdalService adalService;

@Inject
Realm realm;

这两个都来自两个不同的组件。

Both of these come from two different Components.

AdalComponent

@UserScope
@Component(dependencies = {NetComponent.class}, modules = AdalServiceModule.class)
public interface AdalServiceComponent
{
    void inject(MainActivity activity);

    void inject(EventsJob eventsJob);
}

RealmComponent

@UserScope
@Subcomponent(modules = RealmModule.class)
public interface RealmComponent
{
    void inject(EventsJob eventsJob);
}

但是出现以下错误：

Error:(16, 10) error: io.realm.Realm cannot be provided without an @Inject constructor or from an @Provides- or @Produces-annotated method.
    io.realm.Realm is injected at
    com.bjss.bjssevents.jobs.EventsJob.realm
    com.bjss.bjssevents.jobs.EventsJob is injected at
    com.bjss.bjssevents.dagger.components.AdalServiceComponent.inject(eventsJob)

RealmModule

@Module
public class RealmModule
{
    private static final String TAG = RealmModule.class.getSimpleName();

    public RealmModule(@Singleton final Context context)
    {
        Log.d(TAG, "Configuring Realm");
        Realm.init(context);
        Realm.setDefaultConfiguration(new RealmConfiguration.Builder().deleteRealmIfMigrationNeeded().build());
    }

    @UserScope
    @Provides
    public Realm providesRealm()
    {
        Log.d(TAG, "Providing Realm");
        return Realm.getDefaultInstance();
    }
}

推荐答案

内部 AdalServiceComponent 和 RealmComponent 您具有相同的方法：

Inside AdalServiceComponent and RealmComponent you have the same method:

void inject(EventsJob eventsJob);

这是不可接受的。对于指定对象，该对象只能是一个 inject 方法（参数 inject 的参数）。

That is unacceptable. The must be only one inject method for specified object (argument of inject method).

此外，您不能从同一级别的两个模块中注入东西。两个 Component 都具有相同的范围： @UserScope 。他们彼此一无所知。如果要在 AdalServiceComponent 和 RealmComponent 中定义资源，请使其中之一成为父级 Component 和另一个 Subcomponent 。并且 inject 方法应该在子组件中。

Also you can't inject things from two moduled at the same level. Both Component's are annotated with the same Scope: @UserScope. They don't know nothing about each other. If you want to define resources in AdalServiceComponent and RealmComponent make one of them parent Component and the other one Subcomponent. And the inject method should be in subcomponent.

请阅读这本关于高级Dagger-2行为的优秀文章系列，以更好地理解该库。

Please read this excellent article series about advanced Dagger-2 behaviour to gain better understanding of this library.

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