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I am just learning Rx-java and Rxandroid2 and I am just confused what is the major difference between in SubscribeOn and ObserveOn.
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RxJava makes it easy. subscribeOn() operator tells the source Observable which thread to emit and push items on all the way down to Observer (hence, it affects both upstream and downstream operators). It does not matter where you put the subscribeOn() in your Observable chain of operators.
RxAndroid is an extension of RxJava for Android which is used only in Android application. RxAndroid introduced the Main Thread required for Android. To work with the multithreading in Android, we will need the Looper and Handler for Main Thread execution. RxAndroid provides AndroidSchedulers.
2. Default Threading Behavior. By default, Rx is single-threaded which implies that an Observable and the chain of operators that we can apply to it will notify its observers on the same thread on which its subscribe() method is called.
Android Scheduler — This Scheduler is provided by rxAndroid library. This is used to bring back the execution to the main thread so that UI modification can be made. This is usually used in observeOn method.
SubscribeOn specify the Scheduler on which an Observable will operate. ObserveOn specify the Scheduler on which an observer will observe this Observable.
So basically SubscribeOn is mostly subscribed (executed) on a background thread ( you do not want to block the UI thread while waiting for the observable) and also in ObserveOn you want to observe the result on a main thread...
If you are familiar with AsyncTask then SubscribeOn is similar to doInBackground method and ObserveOn to onPostExecute...
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