IllegalArgumentException: Could not locate call adapter for rx.Observable RxJava, Retrofit2

问题

I am getting the above error while calling the rest api. I am using both retrofit2 and RxJava.

ServiceFactory.java

public class ServiceFactory {
public static <T> T createRetrofitService(final Class<T> clazz, final String endpoint){

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(endpoint)
            //.addConverterFactory(GsonConverterFactory.create())

            .build();

    T service = retrofit.create(clazz);
    return service;
}

}

MovieService.java

public interface MovieService{
//public final String API_KEY = "<apikey>";
public final String SERVICE_END = "https://api.mymovies.org/3/";
@GET("movie/{movieId}??api_key=xyz")
Observable<Response<Movies>> getMovies(@Field("movieId") int movieId);

}

Inside MainActivity

      MovieService   tmdbService = ServiceFactory.createRetrofitService(MovieService.class, MovieService.SERVICE_END);
    Observable<Response<Movies>> responseObservable = tmdbService.getMovies(400);
    responseObservable .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Subscriber<Response<Movies>>() {
                @Override
                public void onCompleted() {

                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onNext(Response<Movies> moviesResponse) {

                }
            });

回答1:

Be sure to add implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0' or whatever version you are using to your dependencies, and then configure retrofit with that converter:

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl(endpoint)
    .addConverterFactory(GsonConverterFactory.create())
    .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
    .build();

Updated

RxJavaCallAdapterFactory was renamed to RxJava2CallAdapterFactory. Changed the snipped above.

回答2:

For RxJava2 Use compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'

.addCallAdapterFactory(RxJava2CallAdapterFactory.create())

For more information on usage https://github.com/JakeWharton/retrofit2-rxjava2-adapter

回答3:

you should have to use all Rx dependency of latest version , here i am using version 2 (like rxjava2)

implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'

implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
implementation 'io.reactivex.rxjava2:rxjava:2.1.9'
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'

And add one more thing :

addCallAdapterFactory(RxJava2CallAdapterFactory.create())

in Retrofit Api client like :

retrofit = new Retrofit.Builder()
                    .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                    .addConverterFactory(GsonConverterFactory.create())
                    .baseUrl(BASE_URL)
                    .build();

回答4:

From the said Github project page:

Blockquote This is now DEPRECATED! Retrofit 2.2 and newer have a first-party call adapter for RxJava 2: https://github.com/square/retrofit/tree/master/retrofit-adapters/rxjava2

now you just need to include in your app/build.gradle file:

compile 'com.squareup.retrofit2:adapter-rxjava2:latest.version'

回答5:

In my case, it was enough to replace

.addCallAdapterFactory(RxJavaCallAdapterFactory.create())

with

.addCallAdapterFactory(RxJava2CallAdapterFactory.create())

来源：https://stackoverflow.com/questions/35233161/illegalargumentexception-could-not-locate-call-adapter-for-rx-observable-rxjava