Android Fundamentals #12: Intro to RxJava

Android Academy Minsk

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In this lecture, we're going to focus on using Reactive Extensions (Rx) in Java to compose and consume sequences of data.
At a glance, the API may look similar to Java 8 Streams, but in fact, it is much more flexible and fluent, making it a powerful programming paradigm.
 1) Intro - Sync, Async Callbacks - Rx pros/cons - When to use Rx
2) val disposable = observable.subscribe(observer) a) Observable (Event stream) - Definition - Marble diagram (timeline, event, complete, error) - Observable.just/empty/never/error/from b) Observer - Definition - onSubscribe, onNext, onError, onComplete - Contract (onSubscribe, *onNext onError|onComplete) c) Disposable - Definition - Clear resources
3) val disposable = observable .filter { ... } .map { ... } .subscribeOn(...) .observeOn(...) .subscribe(observer) a) Operators - Reducing (take/filter) - Transforming (map, flatMap) - Aggregating (scan, reduce, count) - Combining (merge, zip, combineLatest) - Time shifting (throttleFirst, debounce) b) Scheduling and threading - subscribeOn/observeOn - io, computation, mainThread
4) Example app - integration into app (build.gradle) - search query with debounce and loading from server
Additional reading (out of scope of lecture) - Single, Maybe, Completable, Flowable - Backpressure - Subject (Publish, Behavior, Replay) - Disposable containers (SerialDisposable, CompositeDisposable) - More operators in each category (TBD) - Side effects (doOnXXX) - Advanced error handling (onErrorReturn, retry) - hot and cold observables - custom observables and operators (compose, from emitter) - testing rx
 BTW, we create a <A HREF="https://t.me/androidacademyminsk" TARGET="_blank" DATA-MSYS-CLICKTRACK="0" REL="nofollow noopener noreferrer">telegram chat</A> for the discussions! 
See you soon!
Android Academy team.
Great thanks to our partners below!
 
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Android Fundamentals #12: Intro to RxJava

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Android Fundamentals #12: Intro to RxJava

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