RxAndroid: Retrofit doesn't work on the second time? - retrofit

Question

I am using RxAndroid and Retrofit for httpRequest, my code is as below:
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(logging)
.authenticator(new DigestAuthenticator())
.build();
// retrofit with custom client
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(NetUtil.getServerBaseUrl())
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.client(client)
.build();
ApiService apiService = retrofit.create(ApiEndpoints.class);
CustomerSubscriber mSubscriber = new CustomerSubscriber();
apiService.checkAccount(mUser.getEmail()).observeOn(AndroidSchedulers.mainThread()).subscribeOn(Schedulers.newThread()).subscribe(mSubscirber);
//Retrofit
#Headers({
"Accept: application/json;charset=utf-8",
"Content-Type: application/json;charset=utf-8"
})
#HEAD("/account")
Observable<Result<Void>> rxHeadAccount(
#Query("email") String encryptedEmail);
My scenario like this: every time when I click the button "apiService.checkAccount()" method will be triggered. The first time:click button, the httpRequest is sent and I can get response
However, click the second time, no httpRequest was sent and the logs shows " I/Choreographer: Skipped 115 frames! The application may be doing too much work on its main thread."
However if I change code to
apiService.checkAccount(mUser.getEmail()).observeOn(AndroidSchedulers.mainThread()).subscribeOn(Schedulers.newThread()).subscribe(new Subscriber<Result<Void>>() {
#Override
public void onCompleted() {
}
#Override
public void onError(Throwable e) {
}
#Override
public void onNext(Result<Void> voidResult) {
}
});
}
});
The Retrofit works very well, it can send HttpRequest as many times as your want?
Looks like the "Subscriber" can't be one instance?
Why, Any idea about it?
Thanks

Answer 1

Once an observable emits a terminal event (a complete or error event) it is not going to emit any more events (see here). Each call to apiService.checkAccount(mUser.getEmail()) creates a new observable to which you can subscribe with a subscriber. This creates a subscription.
You probably want to store your subscription objects and unsubscribe from them when you're done.