RxJava 知識梳理(2) RxJava2 操做符實戰

時間 2019-11-21

原文原文鏈接

1、概述

本文中的全部示例均來自RxJava2這個大神的倉庫，這兩篇文章主要是對示例當中的用法進行一個記錄，方便之後進行查詢。git

2、詳細示例

2.1 `SimpleExampleActivity`

這是一個最簡單的例子，被訂閱者發射了兩個數據（Cricket、Football），而且有一個訂閱者，發生訂閱時，會先回調onSubscribe(Disposable d)，發射數據後，回調onNext(String value)方法，最後回調onComplete()。github

private void doSomeWork() {
        getObservable()
                 //被訂閱者在子線程進行操做.
                .subscribeOn(Schedulers.io())
                 //訂閱者在主線程處理結果.
                .observeOn(AndroidSchedulers.mainThread()) 
                .subscribe(getObserver());
    }

    private Observable<String> getObservable() {
        return Observable.just("Cricket", "Football");
    }

    private Observer<String> getObserver() {
        return new Observer<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果： api

2.2 `MapExampleActivity`

map操做符能夠將一個類型的被訂閱者的數據傳給接收另外一個類型的訂閱者，即Obervable<T>發射的數據能夠傳給Obersever<U>，在轉換的中間，咱們須要本身定義轉換的規則，即map(new Function<T, U>())。數組

private void doSomeWork() {
        getObservable()
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .map(new Function<List<ApiUser>, List<User>>() {

                    @Override
                    public List<User> apply(List<ApiUser> apiUsers) throws Exception {
                        return Utils.convertApiUserListToUserList(apiUsers);
                    }
                })
                .subscribe(getObserver());
    }

    private Observable<List<ApiUser>> getObservable() {
        return Observable.create(new ObservableOnSubscribe<List<ApiUser>>() {
            @Override
            public void subscribe(ObservableEmitter<List<ApiUser>> e) throws Exception {
                if (!e.isDisposed()) {
                    e.onNext(Utils.getApiUserList());
                    e.onComplete();
                }
            }
        });
    }

    private Observer<List<User>> getObserver() {
        return new Observer<List<User>>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(List<User> userList) {
                textView.append(" onNext");
                textView.append(AppConstant.LINE_SEPARATOR);
                for (User user : userList) {
                    textView.append(" firstName : " + user.firstName);
                    textView.append(AppConstant.LINE_SEPARATOR);
                }
                Log.d(TAG, " onNext : " + userList.size());
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果： bash

2.3 `ZipExampleActivity`

zip是Observable的靜態方法，咱們經過它傳入n個能夠是不一樣類型的訂閱者，以及一個聲明將這n個被訂閱者組合成一個新的被訂閱者的函數，這個函數的返回值要和訂閱者的類型的Observer<T>的T一致。app

private void doSomeWork() {
        Observable.zip(getCricketFansObservable(), getFootballFansObservable(),
                new BiFunction<List<User>, List<User>, List<User>>() {
                    @Override
                    public List<User> apply(List<User> cricketFans, List<User> footballFans) throws Exception {
                        return Utils.filterUserWhoLovesBoth(cricketFans, footballFans);
                    }
                })
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<List<User>> getCricketFansObservable() {
        return Observable.create(new ObservableOnSubscribe<List<User>>() {
            @Override
            public void subscribe(ObservableEmitter<List<User>> e) throws Exception {
                if (!e.isDisposed()) {
                    e.onNext(Utils.getUserListWhoLovesCricket());
                    e.onComplete();
                }
            }
        });
    }

    private Observable<List<User>> getFootballFansObservable() {
        return Observable.create(new ObservableOnSubscribe<List<User>>() {
            @Override
            public void subscribe(ObservableEmitter<List<User>> e) throws Exception {
                if (!e.isDisposed()) {
                    e.onNext(Utils.getUserListWhoLovesFootball());
                    e.onComplete();
                }
            }
        });
    }

    private Observer<List<User>> getObserver() {
        return new Observer<List<User>>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(List<User> userList) {
                textView.append(" onNext");
                textView.append(AppConstant.LINE_SEPARATOR);
                for (User user : userList) {
                    textView.append(" firstName : " + user.firstName);
                    textView.append(AppConstant.LINE_SEPARATOR);
                }
                Log.d(TAG, " onNext : " + userList.size());
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果： ide

2.4 `DisposableExampleActivity`

private final CompositeDisposable disposables = new CompositeDisposable();
    
    void doSomeWork() {
        disposables.add(sampleObservable()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(new DisposableObserver<String>() {
                    @Override
                    public void onComplete() {
                        textView.append(" onComplete");
                        textView.append(AppConstant.LINE_SEPARATOR);
                        Log.d(TAG, " onComplete");
                    }

                    @Override
                    public void onError(Throwable e) {
                        textView.append(" onError : " + e.getMessage());
                        textView.append(AppConstant.LINE_SEPARATOR);
                        Log.d(TAG, " onError : " + e.getMessage());
                    }

                    @Override
                    public void onNext(String value) {
                        textView.append(" onNext : value : " + value);
                        textView.append(AppConstant.LINE_SEPARATOR);
                        Log.d(TAG, " onNext value : " + value);
                    }
                }));
    }

    static Observable<String> sampleObservable() {
        return Observable.defer(new Callable<ObservableSource<? extends String>>() {
            @Override
            public ObservableSource<? extends String> call() throws Exception {
                SystemClock.sleep(2000);
                return Observable.just("one", "two", "three", "four", "five");
            }
        });
    }
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2.5 `TakeExampleActivity`

take(n)操做，僅發射前n個數據。函數

private void doSomeWork() {
        getObservable()
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .take(3)
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 3, 4, 5);
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果： ui

2.6 `TimerExampleActivity`

Observable的靜態方法，它會建立Observable，並在等待指定的時間以後發射惟一的事件。spa

private void doSomeWork() {
        getObservable()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<? extends Long> getObservable() {
        return Observable.timer(2, TimeUnit.SECONDS);
    }

    private Observer<Long> getObserver() {
        return new Observer<Long>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Long value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果，能夠發現即便咱們沒有發射任何數據，也會有一個默認值回調到onNext方法當中：

2.7 `IntervalExampleActivity`

interval和timer相似，也是Observable的靜態建立方法，它和timer的區別是：它並非在計時結束後就發射惟一的事件，而是每隔一段時間，就發射一次事件，而且Observer會收到遞增的值。

private void doSomeWork() {
        disposables.add(getObservable()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(getObserver()));
    }

    private Observable<? extends Long> getObservable() {
        return Observable.interval(0, 2, TimeUnit.SECONDS);
    }

    private DisposableObserver<Long> getObserver() {
        return new DisposableObserver<Long>() {

            @Override
            public void onNext(Long value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.8 `SingleObserverExampleActivity`

SingleObserver屬於Observer的一種，它和普通Observer的不一樣，在於其回調方法，它沒有onNext(T t)方法，而是隻有onSuccess(T t)方法。

private void doSomeWork() {
        Single.just("Amit").subscribe(getSingleObserver());
    }

    private SingleObserver<String> getSingleObserver() {
        return new SingleObserver<String>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onSuccess(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }
        };
    }
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運行結果：

2.9 `CompletableObserverExampleActivity`

CompletableObserver也是屬於Observer的一種，它只有onComplete回調，而沒有相似與onNext之間的參數回調。

private void doSomeWork() {
        Completable completable = Completable.timer(1000, TimeUnit.MILLISECONDS);
        completable
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getCompletableObserver());
    }

    private CompletableObserver getCompletableObserver() {
        return new CompletableObserver() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }
        };
    }
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運行結果：

2.10 `FlowableExampleActivity`

private void doSomeWork() {
        Flowable<Integer> observable = Flowable.just(1, 2, 3, 4);
        observable.reduce(50, new BiFunction<Integer, Integer, Integer>() {
            @Override
            public Integer apply(Integer t1, Integer t2) {
                return t1 + t2;
            }
        }).subscribe(getObserver());
    }

    private SingleObserver<Integer> getObserver() {

        return new SingleObserver<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onSuccess(Integer value) {
                textView.append(" onSuccess : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onSuccess : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }
        };
    }
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運行結果：

2.11 `ReduceExampleActivity`

reduce是把發射序列內值進行兩兩比較，直到比較出最值，若是序列的長度小於2，那麼不會被回調。

private void doSomeWork() {
        getObservable().reduce(new BiFunction<Integer, Integer, Integer>() {
                    @Override
                    public Integer apply(Integer t1, Integer t2) {
                        return t1 + t2;
                    }
                }).subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 3, 4);
    }

    private MaybeObserver<Integer> getObserver() {
        return new MaybeObserver<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onSuccess(Integer value) {
                textView.append(" onSuccess : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onSuccess : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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2.12 `BufferExampleActivity`

buffer(a, b)，a表示數組的最大長度，b表示步長。

private void doSomeWork() {
        Observable<List<String>> buffered = getObservable().buffer(3, 1);
        buffered.subscribe(getObserver());
    }

    private Observable<String> getObservable() {
        return Observable.just("one", "two", "three", "four", "five");
    }

    private Observer<List<String>> getObserver() {
        return new Observer<List<String>>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(List<String> stringList) {
                textView.append(" onNext size : " + stringList.size());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : size :" + stringList.size());
                for (String value : stringList) {
                    textView.append(" value : " + value);
                    textView.append(AppConstant.LINE_SEPARATOR);
                    Log.d(TAG, " : value :" + value);
                }

            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.13 `FilterExampleActivity`

filter操做符須要傳入一個條件函數，僅當發射的數據知足該條件時，訂閱者纔會收到數據。

private void doSomeWork() {
        Observable.just(1, 2, 3, 4, 5, 6)
                .filter(new Predicate<Integer>() {
                    @Override
                    public boolean test(Integer integer) throws Exception {
                        return integer % 2 == 0;
                    }
                })
                .subscribe(getObserver());
    }


    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : ");
                textView.append(AppConstant.LINE_SEPARATOR);
                textView.append(" value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext ");
                Log.d(TAG, " value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.14 `SkipExampleActivity`

skip(n)操做符，會跳過前n個結果。

private void doSomeWork() {
        getObservable()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .skip(2)
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 3, 4, 5);
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.15 `ScanExampleActivity`

scan操做符經過遍歷被訂閱者產生的結果，依次對每個結果項按照指定規則進行運算，計算後的結果做爲下一個迭代項參數，每一次迭代項都會把計算結果輸出給訂閱者。

private void doSomeWork() {
        getObservable()
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .scan(new BiFunction<Integer, Integer, Integer>() {
                    @Override
                    public Integer apply(Integer int1, Integer int2) throws Exception {
                        return int1 + int2;
                    }
                })
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 3, 4, 5);
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.16 `ReplayExampleActivity`

relay(n)，使得即便在未訂閱時，被訂閱者已經發射了數據，訂閱者也能夠收到被訂閱者在訂閱以前最多n個數據。

private void doSomeWork() {
        PublishSubject<Integer> source = PublishSubject.create();
        ConnectableObservable<Integer> connectableObservable = source.replay(3); 
        connectableObservable.connect(); // connecting the connectableObservable
        connectableObservable.subscribe(getFirstObserver());
        source.onNext(1);
        source.onNext(2);
        source.onNext(3);
        source.onNext(4);
        source.onComplete();
        connectableObservable.subscribe(getSecondObserver());
    }

    private Observer<Integer> getFirstObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " First onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" First onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" First onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" First onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onComplete");
            }
        };
    }

    private Observer<Integer> getSecondObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
                Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
                textView.append(AppConstant.LINE_SEPARATOR);
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" Second onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" Second onError : " + e.getMessage());
                Log.d(TAG, " Second onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" Second onComplete");
                Log.d(TAG, " Second onComplete");
            }
        };
    }
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運行結果：

2.17 `ConcatExampleActivity`

Observable.concat(Observable a, Observable b)，鏈接兩個被訂閱者，訂閱者將會按照a->b的順序收到兩個被訂閱者所發射的消息。

private void doSomeWork() {
        final String[] aStrings = {"A1", "A2", "A3", "A4"};
        final String[] bStrings = {"B1", "B2", "B3"};

        final Observable<String> aObservable = Observable.fromArray(aStrings);
        final Observable<String> bObservable = Observable.fromArray(bStrings);

        Observable.concat(aObservable, bObservable)
                .subscribe(getObserver());
    }


    private Observer<String> getObserver() {
        return new Observer<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.18 `MergeExampleActivity`

merge和concat相似，也是用來鏈接兩個被訂閱者，可是它不保證兩個被訂閱發射數據的順序。

private void doSomeWork() {
        final String[] aStrings = {"A1", "A2", "A3", "A4"};
        final String[] bStrings = {"B1", "B2", "B3"};

        final Observable<String> aObservable = Observable.fromArray(aStrings);
        final Observable<String> bObservable = Observable.fromArray(bStrings);

        Observable.merge(aObservable, bObservable)
                .subscribe(getObserver());
    }


    private Observer<String> getObserver() {
        return new Observer<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.19 `DeferExampleActivity`

使用defer能夠延遲被訂閱者的生成，也就是使得被訂閱者是在訂閱發生時才生成。

private void doSomeWork() {
        Car car = new Car();
        Observable<String> brandDeferObservable = car.brandDeferObservable();
        car.setBrand("BMW");
        brandDeferObservable.subscribe(getObserver());
    }

    private Observer<String> getObserver() {
        return new Observer<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.20 `DistinctExampleActivity`

distinct僅會發射序列當中以前沒有發射過的數據。

private void doSomeWork() {

        getObservable()
                .distinct()
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.just(1, 2, 1, 1, 2, 3, 4, 6, 4);
    }


    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.21 `LastOperatorExampleActivity`

private void doSomeWork() {
        getObservable().last("A1") .subscribe(getObserver());
    }

    private Observable<String> getObservable() {
        return Observable.just("A1", "A2", "A3", "A4", "A5", "A6");
    }

    private SingleObserver<String> getObserver() {
        return new SingleObserver<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onSuccess(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext value : " + value);
            }


            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }
        };
    }
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運行結果：

2.22 `ReplaySubjectExampleActivity`

ReplaySubject使得不管訂閱者在什麼時候訂閱，它們都能收到被訂閱者發射序列中的全部數據。

private void doSomeWork() {
        ReplaySubject<Integer> source = ReplaySubject.create();
        source.subscribe(getFirstObserver());
        source.onNext(1);
        source.onNext(2);
        source.onNext(3);
        source.onNext(4);
        source.onComplete();
        source.subscribe(getSecondObserver());
    }

    private Observer<Integer> getFirstObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " First onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" First onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" First onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" First onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onComplete");
            }
        };
    }

    private Observer<Integer> getSecondObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
                Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
                textView.append(AppConstant.LINE_SEPARATOR);
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" Second onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" Second onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" Second onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onComplete");
            }
        };
    }
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運行結果：

2.23 `PublishSubjectExampleActivity`

若是使用了PublishSubject，那麼對於訂閱者來講，它們只會收到被訂閱者在訂閱以後發射的序列。

private void doSomeWork() {
        PublishSubject<Integer> source = PublishSubject.create();
        source.onNext(1);
        source.onNext(2);
        source.onNext(3);
        source.subscribe(getSecondObserver());
        source.onNext(4);
        source.onComplete();
    }


    private Observer<Integer> getFirstObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " First onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" First onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" First onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" First onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onComplete");
            }
        };
    }

    private Observer<Integer> getSecondObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
                Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
                textView.append(AppConstant.LINE_SEPARATOR);
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" Second onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" Second onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" Second onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onComplete");
            }
        };
    }
複製代碼

運行結果：

2.24 `BehaviorSubjectExampleActivity`

若是使用了BehaviorSubject這個被訂閱者，那麼被訂閱者收到的序列和它訂閱的時間點有關，被訂閱者會收到發生訂閱以前最近一次的發射的值（若是以前沒有發射任何值，那麼有多是一個種子/默認值），以及從訂閱時刻到整個序列完成的序列。

private void doSomeWork() {
        BehaviorSubject<Integer> source = BehaviorSubject.create();
        source.subscribe(getFirstObserver()); // it will get 1, 2, 3, 4 and onComplete
        source.onNext(1);
        source.onNext(2);
        source.onNext(3);
        source.subscribe(getSecondObserver());
        source.onNext(4);
        source.onComplete();
    }


    private Observer<Integer> getFirstObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " First onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" First onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" First onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" First onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onComplete");
            }
        };
    }

    private Observer<Integer> getSecondObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
                Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
                textView.append(AppConstant.LINE_SEPARATOR);
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" Second onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" Second onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" Second onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onComplete");
            }
        };
    }
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運行結果：

2.25 `AsyncSubjectExampleActivity`

若是使用了AsyncSubject這個被訂閱者，那麼它全部的訂閱者只會在被訂閱者整個序列發射完成以後才能收到值，而且僅僅會收到整個發射序列的最後一個值。若是訂閱者沒有發射任何一個值，那麼全部的被訂閱者都不會收到除完成以外的其它消息。

private void doSomeWork() {
        AsyncSubject<Integer> source = AsyncSubject.create();
        source.subscribe(getFirstObserver()); //第一個訂閱者.
        source.onNext(1);
        source.onNext(2);
        source.onNext(3);
        source.subscribe(getSecondObserver()); //第二個訂閱者.
        source.onNext(4);
        source.onComplete();
    }

    private Observer<Integer> getFirstObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " First onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" First onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" First onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" First onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " First onComplete");
            }
        };
    }

    private Observer<Integer> getSecondObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                textView.append(" Second onSubscribe : isDisposed :" + d.isDisposed());
                Log.d(TAG, " Second onSubscribe : " + d.isDisposed());
                textView.append(AppConstant.LINE_SEPARATOR);
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" Second onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onNext value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" Second onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" Second onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " Second onComplete");
            }
        };
    }
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運行結果：

2.26 `ThrottleFirstExampleActivity`

throttleFirst用來解決抖動的問題，咱們能夠設置一段時間，以後它會發射固定時間長度以內的第一個事件，而屏蔽其它的事件。

private void doSomeWork() {
        getObservable()
                .throttleFirst(500, TimeUnit.MILLISECONDS)
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                // send events with simulated time wait
                Thread.sleep(0);
                emitter.onNext(1); // deliver
                emitter.onNext(2); // skip
                Thread.sleep(505);
                emitter.onNext(3); // deliver
                Thread.sleep(99);
                emitter.onNext(4); // skip
                Thread.sleep(100);
                emitter.onNext(5); // skip
                emitter.onNext(6); // skip
                Thread.sleep(305);
                emitter.onNext(7); // deliver
                Thread.sleep(510);
                emitter.onComplete();
            }
        });
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : ");
                textView.append(AppConstant.LINE_SEPARATOR);
                textView.append(" value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext ");
                Log.d(TAG, " value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.27 `ThrottleLastExampleActivity`

throttleLast和throttleFirst相似，都是設置固定的時間長度，可是它發射的是這個時間段內的最後一個事件，而不是第一個事件。

private void doSomeWork() {
        getObservable()
                .throttleLast(500, TimeUnit.MILLISECONDS)
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                // send events with simulated time wait
                Thread.sleep(0);
                emitter.onNext(1); // skip
                emitter.onNext(2); // deliver
                Thread.sleep(505);
                emitter.onNext(3); // skip
                Thread.sleep(99);
                emitter.onNext(4); // skip
                Thread.sleep(100);
                emitter.onNext(5); // skip
                emitter.onNext(6); // deliver
                Thread.sleep(305);
                emitter.onNext(7); // deliver
                Thread.sleep(510);
                emitter.onComplete();
            }
        });
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : ");
                textView.append(AppConstant.LINE_SEPARATOR);
                textView.append(" value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext ");
                Log.d(TAG, " value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
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運行結果：

2.28 `DebounceExampleActivity`

Observable.debounce(float value, Unit unit)，dounce，被訂閱者在收到要發射消息的指令後，會等待一段時間，若是在這段時間內沒有新的消息發射指令，那麼它會發射這條消息，不然它會丟棄掉它，從這個新收到的值開始從新等待設置的時間長度。

private void doSomeWork() {
        getObservable()
                .debounce(500, TimeUnit.MILLISECONDS)
                // Run on a background thread
                .subscribeOn(Schedulers.io())
                // Be notified on the main thread
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getObserver());
    }

    private Observable<Integer> getObservable() {
        return Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                // send events with simulated time wait
                emitter.onNext(1); // skip
                Thread.sleep(400);
                emitter.onNext(2); // deliver
                Thread.sleep(505);
                emitter.onNext(3); // skip
                Thread.sleep(100);
                emitter.onNext(4); // deliver
                Thread.sleep(605);
                emitter.onNext(5); // deliver
                Thread.sleep(510);
                emitter.onComplete();
            }
        });
    }

    private Observer<Integer> getObserver() {
        return new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(Integer value) {
                textView.append(" onNext : ");
                textView.append(AppConstant.LINE_SEPARATOR);
                textView.append(" value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext ");
                Log.d(TAG, " value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }
複製代碼

2.29 `WindowExampleActivity`

每隔ns集中發射這段時間內的數據，而不是一有數據就發射。

protected void doSomeWork() {
        Observable.interval(1, TimeUnit.SECONDS).take(12)
                .window(3, TimeUnit.SECONDS)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(getConsumer());
    }

    public Consumer<Observable<Long>> getConsumer() {
        return new Consumer<Observable<Long>>() {
            @Override
            public void accept(Observable<Long> observable) throws Exception {
                Log.d(TAG, "Sub Divide begin....");
                textView.append("Sub Divide begin ....");
                textView.append(AppConstant.LINE_SEPARATOR);
                observable
                        .subscribeOn(Schedulers.io())
                        .observeOn(AndroidSchedulers.mainThread())
                        .subscribe(new Consumer<Long>() {
                            @Override
                            public void accept(Long value) {
                                Log.d(TAG, "Next:" + value);
                                textView.append("Next:" + value);
                                textView.append(AppConstant.LINE_SEPARATOR);
                            }
                        });
            }
        };
    }
複製代碼

RxJava 知識梳理(2) RxJava2 操做符實戰

1、概述

2、詳細示例

2.1 SimpleExampleActivity

2.2 MapExampleActivity

2.3 ZipExampleActivity

2.4 DisposableExampleActivity

2.5 TakeExampleActivity

2.6 TimerExampleActivity

2.7 IntervalExampleActivity

2.8 SingleObserverExampleActivity

2.9 CompletableObserverExampleActivity

2.10 FlowableExampleActivity

2.11 ReduceExampleActivity

2.12 BufferExampleActivity

2.13 FilterExampleActivity

2.14 SkipExampleActivity

2.15 ScanExampleActivity

2.16 ReplayExampleActivity

2.17 ConcatExampleActivity

2.18 MergeExampleActivity

2.19 DeferExampleActivity

2.20 DistinctExampleActivity

2.21 LastOperatorExampleActivity

2.22 ReplaySubjectExampleActivity

2.23 PublishSubjectExampleActivity

2.24 BehaviorSubjectExampleActivity

2.25 AsyncSubjectExampleActivity

2.26 ThrottleFirstExampleActivity

2.27 ThrottleLastExampleActivity

2.28 DebounceExampleActivity

2.29 WindowExampleActivity

更多文章，歡迎訪問個人 Android 知識梳理系列：

2.1 `SimpleExampleActivity`

2.2 `MapExampleActivity`

2.3 `ZipExampleActivity`

2.4 `DisposableExampleActivity`

2.5 `TakeExampleActivity`

2.6 `TimerExampleActivity`

2.7 `IntervalExampleActivity`

2.8 `SingleObserverExampleActivity`

2.9 `CompletableObserverExampleActivity`

2.10 `FlowableExampleActivity`

2.11 `ReduceExampleActivity`

2.12 `BufferExampleActivity`

2.13 `FilterExampleActivity`

2.14 `SkipExampleActivity`

2.15 `ScanExampleActivity`

2.16 `ReplayExampleActivity`

2.17 `ConcatExampleActivity`

2.18 `MergeExampleActivity`

2.19 `DeferExampleActivity`

2.20 `DistinctExampleActivity`

2.21 `LastOperatorExampleActivity`

2.22 `ReplaySubjectExampleActivity`

2.23 `PublishSubjectExampleActivity`

2.24 `BehaviorSubjectExampleActivity`

2.25 `AsyncSubjectExampleActivity`

2.26 `ThrottleFirstExampleActivity`

2.27 `ThrottleLastExampleActivity`

2.28 `DebounceExampleActivity`

2.29 `WindowExampleActivity`