Dagger2 Subcomponent module override

Question

ApplicationComponent.java

@Component(modules = SomeModule.class)
@ApplicationScope
public interface ApplicationComponent {
    // stuff
    ActivityComponent activityComponent();
}

ActivityComponent.java

@Subcomponent(modules = AnotherModule.class)
@ActivityScope
public interface ActivityComponent {
    // stuff
    void inject(MainActivity mainActivity);
}

SomeModule can be overriden using something like this . But how about AnotherModule ?

One solution would be to separate the 2 components, but what if I want to reuse some bindings from the parent?

edit:

MainActivity.java

onCreate(Bundle bundle) {
    getApplicationComponent().getActivityComponent().inject(this);
}

edit2:

ActivityRyle.java

init() {
    application.setComponent(DaggerApplicationComponent.builder()
                    .someModule(new TestSomeModule(application))
                    .build();
}

edit3: I'm trying to avoid wiring too much stuff in Application (where the main component is created).

Answer 1

You also just override the module.

Please keep in mind, how you create subcomponents:

public interface ApplicationComponent {

    ActivityComponent activityComponent(/*needed modules go here*/);
}

So unless you have no-args constructors for modules, you have to put them as parameters in the method declaration.

If you want to be able to override modules with a no-arg constructor, you'd have to add them to your method signature:

public interface ApplicationComponent {

    ActivityComponent activityComponent(AnotherModule module);
}

And in your test you just supply your subclass.

Answer 2

您需要将该模块声明为子组件工厂方法的输入参数。