lets say I have:
public interface Shape {}
public class Rectangle implements Shape {
}
public class Circle implements Shape {
}
and I have a ApplicationModule which needs to provides instances for both Rec and Circle:
@Module
public class ApplicationModule {
private Shape rec;
private Shape circle;
public ApplicationModule() {
rec = new Rectangle();
circle= new Circle ();
}
@Provides
public Shape provideRectangle() {
return rec ;
}
@Provides
public Shape provideCircle() {
return circle;
}
}
and ApplicationComponent:
@Component(modules = ApplicationModule.class)
public interface ApplicationComponent {
Shape provideRectangle();
}
with the code the way it is - it won't compile. error saying
Error:(33, 20) error: Shape is bound multiple times.
It makes sense to me that this can't be done, because the component is trying to find a Shape instance, and it finds two of them, so it doesn't know which one to return.
My question is - how can I handle this issue?
I recently post the answer to a question like this in this post :
Dagger 2 : error while getting a multiple instances of same object with @Named
You need to use @Named("someName")in your module like this:
@Module
public class ApplicationModule {
private Shape rec;
private Shape circle;
public ApplicationModule() {
rec = new Rectangle();
circle= new Circle ();
}
@Provides
@Named("rect")
public Shape provideRectangle() {
return rec ;
}
@Provides
@Named("circle")
public Shape provideCircle() {
return circle;
}
}
Then wherever you need to inject them just write
@Inject
@Named("rect")
Shape objRect;
its funny but you have to inject in a different way in Kotlin:
@field:[Inject Named("rect")]
lateinit var objRect: Shape