Async injection with Dagger 2 and RxJava

ObservableHeavyExternalLibrary.java

@Singleton
@Provides
Observable<HeavyExternalLibrary> provideHeavyExternalLibraryObservable(final Lazy<HeavyExternalLibrary> heavyExternalLibraryLazy) {
    return Observable.create(new Observable.OnSubscribe<HeavyExternalLibrary>() {
        @Override
        public void call(Subscriber<? super HeavyExternalLibrary> subscriber) {
            subscriber.onNext(heavyExternalLibraryLazy.get());
        }
    }).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread());
}