How to properly handle onError inside RxJava (Android)?

Question

I\'m getting a list of installed apps on the device. It\'s a costly operation, so I\'m using Rx for that:

    Observable observable = Observable         


        

Answer 1

Here is the newbie response (because I am new in javarx and finally fix this issue) :

Here is your implementation :

    Observable.create(new Observable.OnSubscribe() {
                @Override
                public void call(Subscriber subscriber) {
                    subscriber.onError(new Exception("TADA !"));
                }
            })
            .doOnNext(actionNext)
            .doOnError(actionError)
            .doOnCompleted(actionCompleted)
            .subscribe();

In this previous implementation, when I subscribe I trigger the error flow ... and I get an application crash.

The problem is that you HAVE TO manage the error from the subscribe() call. The "doOnError(...)" is just a kind of helper that clone the error and give you a new place to do some action after an error. But it doesn't Handle the error.

So you have to change your code with that :

    Observable.create(new Observable.OnSubscribe() {
                @Override
                public void call(Subscriber subscriber) {
                    subscriber.onError(new Exception("TADA !"));
                }
            })
            .subscribe(actionNext, actionError, actionCompleted);

Not sure about the real explanation, but this is how I fix it. Hope it will help.