CODEWITHSUNDEEP
dependency-injectiondagger-2
Jose Ramirez
Jose Ramirez

Reputation: 401

Injecting dependencies inside @Provides methods with Dagger 2

I have these three dependencies correctly created (I verified it by debugging that they indeed exist) using Dagger 2, let's call them a, b, c, like so:

class Example {
    ...
    @Inject A a;
    @Inject B b;
    @Inject C c;
    ...
},

provided by SomeModule as follows:

@Module
class SomeModule {
    ...
    @Singleton @Provides A provideA(){return new A()};
    @Singleton @Provides B provideB(){return new B()};
    @Singleton @Provides C provideC(){return new C()};
    ...
},

and the component is a fairly simple one:

@Component(modules = {SomeModule.class, ...})
class SomeComponent {
    ...
    void inject(Example example);
    ...
},

and I need them to create another objects, let's call them d, e, something like this:

public Example(){
    DaggerSomeComponent.builder().build().inject(this);
    ...
    this.d = new D(c);
    this.e = new E(d, a, b);
    ...
}

My question is: is it possible to get to something like this?

class Example {
    ...
    @Inject A a;
    @Inject B b;
    @Inject C c;
    @Inject D d;
    @Inject E e;
    ...
    public Example(){
        DaggerSomeComponent.builder().build().inject(this);
        ...
    }
}

Upvotes: 0

Views: 100

Answers (1)

Jeff Bowman
Jeff Bowman

Reputation: 95634

Yes, @Provides methods can take parameters. Dagger will create instances before invoking the method.

@Provides D provideD(C c){return new D(c)};
@Provides E provideE(A a, B b, D d){return new E(d, a, b)};

Upvotes: 1

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