android.os.NetworkOnMainThreadException using rxjava on android

Question

i\'m having trouble implementing rxJava in order to check if there is internet connection on android i\'m doing it like this:

on my launcher activity i have this in

Answer 1

AdamS is correct, however RxJava 2 now offers Observable.fromCallable() to defer an observable operation till subscription. A good reference: https://caster.io/lessons/fromcallable-converting-slow-methods-into-an-observable/

Some example code from my use-case:

Single.fromCallable(new Callable() {
        @Override
        public Response call() throws Exception {
            return NetworkGateway.networkRequest();
        }
    })
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(observer);