RxJava - Speaker Deck

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RxJava Douglas Drumond [email protected]

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whoami

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Por que RxJava? Eventos de UI Eventos do domínio Concorrência

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RxJava Observer pattern Iterator pattern Functional programming

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Lambda

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Retrolambda export JAVA_HOME=/path/java8 export JAVA7_HOME=/path/java7

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Retrolambda plugins { id "me.tatarka.retrolambda" version "3.2.2" } android { compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } }

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Retrolambda view.setOnClickListener(new View. OnClickListener() { @Override public void onClick(final View v) { ... } });

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Retrolambda view.setOnClickListener(v -> { });

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Básico Observables Subscribers Operadores

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Observables Emite itens Chama onNext, onComplete ou onError Hot or Cold

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Subscriber Implementa onNext onComplete onError

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Operadores flatMap filter debounce create defer etc

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Criando Observable e Subscriber DEMO

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Operators Subscribers reagem, não mudam Operadores transformam dados

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Operators DEMO

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Exemplo com UI DEMO

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Mais operadores filter Ex: .filter(query -> !TextUtils.isEmpty(query))

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Threads subscribeOn observeOn NewThreadScheduler HandlerThreadScheduler

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Rede DEMO

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Tratamento de erros Observable.create(...) .map(s -> exception(s)) .map(s -> exception2(s)) .subscribe(new Subscriber() { @Override public void onNext(String s) { Log.d(TAG, s); } @Override public void onCompleted() { Log.d(TAG, "uhu!"); } @Override public void onError(Throwable e) { Log.e(TAG, "ops!"); } });

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Ciclo de vida da Activity .cache .unsubscribe ao rodar .subscribe ao restaurar Use RxLifecycle

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Google Play Services https://github.com /mcharmas/Android-ReactiveLocation https://github.com /zmarkan/Reactive-PlayServices

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Google Play Services ReactiveLocationProvider locationProvider = new ReactiveLocationProvider(context); locationProvider.getLastKnownLocation() .subscribe(new Action1() { @Override public void call(Location location) { doSthImportantWithObtainedLocation(location); } });

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Testes @Test public void shouldLoadTwoUsers() throw Exception { TestSubscriber testSubscriber = new TestSubscriber<>(); databaseHelper.loadUser().subscribe(testSubscriber); testSubscriber.assertNoErrors(); testSubscriber.assertReceivedOnNext( Arrays.asList(user1, user2)) }

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Testes https://github.com/ribot/assertj-rx + BlockingObservable

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Testes (exemplo) assertThat(observable.toBlocking()). completes(); assertThat(observable.toBlocking()) .completes() .listOfValuesEmitted() .containsExactly("a", "b", "c");

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Referências http://reactivex.io/ https://github.com/ReactiveX/RxJava/wiki /Alphabetical-List-of-Observable-Operators https://speakerdeck.com/benjchristensen https://github.com/mutexkid/rxjava-koans

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Referências https://github.com/trello/RxLifecycle https://github.com/JakeWharton/RxBinding https://github.com/ReactiveX/RxAndroid/

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Código https://github.com/ douglasdrumond/KnightsOfLambdaCalculus

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Obrigado

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Contato [email protected] @douglasdrumond +DouglasDrumond www.cafelinear.com [email protected]