Retrotif2 + RxJava sending POST request failed - http-post

Question

I want to send POST request with Retrofit + RxJava, but it is failing and I don't know the reason. In one activity it's working, in another - don't want to work:
private void sendMerchantInfo() {
try {
String advertiserOriginalDeepLink = "https://mywebsite.com/main-1?param1=value1&param2=value2";
String urlGetParams = LinkParser.getUrlGETParams(advertiserOriginalDeepLink);
Map<Object, Object> merchantInfo = LinkParser.parseUrlGetParams(urlGetParams);
String merchantInfoJson = new Gson().toJson(merchantInfo); //{"param1":"value1","param2":"value2"}
String url = "https://api.endpoint.com/v1/system/merchant/process";
userService = this.serviceGenerator.createService(UserService.class, true);
final Observable observable = userService.sendUserInfo(
url, new RetrofitMapBody(merchantInfo))
.doOnNext(new Consumer<ResponseBody>() {
#Override
public void accept(ResponseBody responseBody) throws Exception {
//handle 200 OK.
}
})
.onErrorResumeNext((ObservableSource<? extends ResponseBody>) v ->
Crashlytics.log("Send user info attempt failed."))
.subscribeOn(Schedulers.from(threadExecutor))
.observeOn(postExecutionThread.getScheduler());
addDisposable(observable.subscribe());
}
} catch (Exception exception) {
Crashlytics.log("Send user info attempt failed. " + exception.getMessage());
}
}
I suspect that problem in this part, I am trying to send request in OnCreate() method:
.subscribeOn(Schedulers.from(threadExecutor))
.observeOn(postExecutionThread.getScheduler());
Tried to use this, but no effect:
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());
What I am doing wrong? It always call onErrorResumeNext() It's probably something with threads because one time I got exception: networkonmainthreadexception. Please help.

Answer 1

Try using RxJava2 Adapter, it will save you a lot!
Step 1: Retrofit client setup
private Retrofit getRetrofitClient() {
return new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create()) //option 1
.addCallAdapterFactory(RxJava2CallAdapterFactory.createWithScheduler(Schedulers.newThread())) //option 2
.build();
}
Step 2: APIService interface (Example)
#GET("endpoint")
Single<ResponseModel> fetch();
Step 3: Usage
Single<ResponseModel> fetch() {
return getRetrofitClient()
.create(APIService.class)
.fetch();
}
Any non-2xx HTTP response will be wrapped in HttpException from which you can extract the status code, the status message and the full HTTP response.
Any connection errors will be wrapped in IOException
And that is all you need to do to wrap your network call in any RxJava stream.