How to handle onError inside RxJava. I am getting “OnErrorNotImplementedException”

Question

In my app I am using ReactiveLocationProvider library (link). I subscribe for updates in the onCreate method. It works fine when the device is online but if I switch my wifi

Answer 1

There is an error happening when you are trying to geocode the location.

Caused by: java.io.IOException: Timed out waiting for response from server at android.location.Geocoder.getFromLocation(Geocoder.java:136)

When you call subscribe with one Action1 as a parameter it only handles calls to onNext and if an error happens the app will crash.

You need to subscribe with:

subscribe(new Subscriber<Location>() {
    @Override
    public void onNext(Location location) { /*Handle the location updates*/ }

    @Override
    public void onCompleted() { }

    @Override
    public void onError(Throwable e) { }
})

Answer 2

Consider subscribing to the location data with subscribe(Action<T> onNext, Action<Throwable> onError). In other words, you should handle errors that are emitted from the observable data.

Answer 3

If you still wish to implement only one method and handle error too, then probably you can have abstract CustomSubscriber like below.

public abstract class CustomSubscriber<T> extends Subscriber<T> {

    @Override
    public void onCompleted() {

    }

    @Override
    public void onError(Throwable e) {

    }

    @Override
    public void onNext(T t) {

    }
}

Implement this way

 getObservable()
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new CustomSubscriber<List<String>>() {
        @Override
        public void onNext(List<String> list) {

        }
    });

hope some one will benefited.