CODEWITHSUNDEEP
androidretrofit2moshi
kaulex
kaulex

Reputation: 3187

Unable to create call adapter for retrofit2.Response<...>

My Api:

@GET("/cinema/notShownMovies")
fun getNotShownMovies(
   @Query("token") token: String
): Response<GetMovieResponse>

Exception when trying to call API:

java.lang.IllegalArgumentException: Unable to create call adapter for retrofit2.Response<...data.GetMovieResponse> for method InstanceApi.getNotShownMovies Unable to create call adapter for retrofit2.Response<...data.GetMovieResponse> for method InstanceApi.getNotShownMovies

I don't know where to start. All other API calls work fine which is also defined in the same API class. Maybe a model error?

Upvotes: 26

Views: 20700

Answers (3)

ricardopereira
ricardopereira

Reputation: 11683

I had a similar crash IllegalArgumentException: Call return type must be parameterized as Call.

Crash log:

Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for interface retrofit2.Call
    for method Api.login
    at retrofit2.Utils.methodError(Utils.java:54)
    at retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:116)
    at retrofit2.HttpServiceMethod.parseAnnotations(HttpServiceMethod.java:67)
    at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:39)
    at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:202)
    at retrofit2.Retrofit$1.invoke(Retrofit.java:160)
    at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
    at $Proxy0.login(Unknown Source)
    at <redacted>.screen.login.LoginActivity.onSignInClick(LoginActivity.java:103)
    ... 13 more
Caused by: java.lang.IllegalArgumentException: Call return type must be parameterized as Call<Foo> or Call<? extends Foo>
    at retrofit2.DefaultCallAdapterFactory.get(DefaultCallAdapterFactory.java:42)
    at retrofit2.Retrofit.nextCallAdapter(Retrofit.java:253)
    at retrofit2.Retrofit.callAdapter(Retrofit.java:237)
    at retrofit2.HttpServiceMethod.createCallAdapter(HttpServiceMethod.java:114)
    ... 20 more

I found out it was crashing because of Proguard/R8. Proguard was renaming Retrofit classes and to fix it I updated the Proguard settings with:

-dontwarn retrofit2.**
-keep class retrofit2.** { *; }

Upvotes: 17

Hardik Patel
Hardik Patel

Reputation: 1

In the Gradle file add this line inside of release buildTyps

  • minifyEnabled false

Upvotes: -7

Abdul Mateen
Abdul Mateen

Reputation: 1674

Just add suspend modifier if using coroutines. This will solve the problem.

Otherwise your issue is likely because there is no Call adapter added when instantiating your Retrofit object. For example, for RxJava2, you can include a call adapter by adding this line while building it.

.addCallAdapterFactory(RxJava2CallAdapterFactory.createWithScheduler(Schedulers.io()))

Upvotes: 68

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