Subscribing and unsubscribing
The Observable.subscribe() method has many overloads as follows:
subscribe(): This one ignores all the emissions from theObservableinstance and throws anOnErrorNotImplementedExceptionexception if there is anOnErrornotification. This can be used to only trigger theOnSubscribe.callbehavior.subscribe(Action1<? super T>): This only subscribes toonNext()method-triggered updates. It ignores theOnCompletednotification and throws anOnErrorNotImplementedExceptionexception if there is anOnErrornotification. It is not a good choice for real production code, because it is hard to guarantee that no errors will be thrown.subscribe(Action1<? super T>, Action1<Throwable>): This is the same as preceding one, but the second parameter is called if there is anOnErrornotification.subscribe(Action1<? super T>,Action1<Throwable>, Action0): This is the same as the preceding one, but the third parameter is called onOnCompletednotification...
