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過(guò)濾操作符

根據(jù)應(yīng)用場(chǎng)景對(duì)過(guò)濾操作符進(jìn)行分類，可分成以下4個(gè)類別：

1. 根據(jù)"指定條件"過(guò)濾事件

操作符	作用
filter	過(guò)濾特定條件的事件
ofType	過(guò)濾特定數(shù)據(jù)類型的數(shù)據(jù)
skip/skipLast	跳過(guò)某個(gè)事件
distinct/distinctUntilChanged	過(guò)濾事件序列中重復(fù)的事件 / 連續(xù)重復(fù)的事件

filter()

Observable.just("hello", 1, "haha", 2).filter(new Predicate<Serializable>() {
    @Override
    public boolean test(Serializable serializable) throws Throwable {
        return serializable instanceof Integer;
    }
}).subscribe(observer);

結(jié)果：

2022-05-05 14:59:17.674 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 14:59:17.674 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 14:59:17.675 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:2
2022-05-05 14:59:17.675 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

ofType()

Observable.just(1,2,"hello").ofType(String.class).subscribe(observer);

結(jié)果：

2022-05-05 14:58:09.137 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 14:58:09.137 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:hello
2022-05-05 14:58:09.137 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

skip()

Observable.just(1,2,3,4,5).skip(2).subscribe(observer);

結(jié)果：

2022-05-05 15:00:10.151 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:00:10.151 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:3
2022-05-05 15:00:10.151 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:4
2022-05-05 15:00:10.152 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:5
2022-05-05 15:00:10.152 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

skipLast()

Observable.just(1,2,3,4,5).skipLast(3).subscribe(observer);

結(jié)果：

2022-05-05 15:01:03.328 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:01:03.328 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 15:01:03.328 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:2
2022-05-05 15:01:03.328 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

distinct()

//過(guò)濾事件序列中重復(fù)的事件
Observable.just(1,2,2,4,4,5,6, 1).distinct().subscribe(observer);

結(jié)果：

2022-05-05 15:01:42.336 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:2
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:4
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:5
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:6
2022-05-05 15:01:42.337 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

distinctUntilChanged()

//過(guò)濾事件序列中連續(xù)重復(fù)的事件
Observable.just(1,2,2,4,4,5,6, 1).distinctUntilChanged().subscribe(observer);

結(jié)果：

2022-05-05 15:02:07.275 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:2
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:4
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:5
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:6
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 15:02:07.276 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

2. 根據(jù)"指定事件數(shù)量"過(guò)濾事件

操作符	作用
take	指定觀察者最多能接收到的事件數(shù)量
takeLast	指定觀察者只能接收到被觀察者發(fā)送的最后幾個(gè)事件

take

Observable.just(1,2,3,4,5).take(2).subscribe(observer);

結(jié)果:

2022-05-05 15:06:45.219 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:06:45.219 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:1
2022-05-05 15:06:45.219 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:2
2022-05-05 15:06:45.219 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

takeLast

Observable.just(1,2,3,4,5).takeLast(1).subscribe(observer);

結(jié)果:

2022-05-05 15:06:58.362 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe:
2022-05-05 15:06:58.363 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onNext:5
2022-05-05 15:06:58.363 1522-1522/com.alsan.rxjavademo D/RxFilterSymbolActivity: onComplete

3. 根據(jù)"指定時(shí)間"過(guò)濾事件

操作符	作用
throttleFirst	在某段時(shí)間內(nèi)，只發(fā)送該段時(shí)間內(nèi)第1次事件
throttleLast/sample	在某段時(shí)間內(nèi)，只發(fā)送該段時(shí)間內(nèi)最后1次事件
throttleWithTimeout / debounce	發(fā)送數(shù)據(jù)事件時(shí)，若2次發(fā)送事件的間隔＜指定時(shí)間，就會(huì)丟棄前一次的數(shù)據(jù)，直到指定時(shí)間內(nèi)都沒(méi)有新數(shù)據(jù)發(fā)射時(shí)才會(huì)發(fā)送后一次的數(shù)據(jù)

throttleFirst

Observable.create(new ObservableOnSubscribe<Integer>() {
    @Override
    public void subscribe(ObservableEmitter<Integer> e) throws Exception {
        // 隔段事件發(fā)送時(shí)間
        e.onNext(1);
        Thread.sleep(500);

        e.onNext(2);
        Thread.sleep(400);

        e.onNext(3);
        Thread.sleep(300);

        e.onNext(4);
        Thread.sleep(300);

        e.onNext(5);
        Thread.sleep(300);

        e.onNext(6);
        Thread.sleep(400);

        e.onNext(7);
        Thread.sleep(300);
        e.onNext(8);

        Thread.sleep(300);
        e.onNext(9);

        Thread.sleep(300);
        e.onComplete();
    }
}).throttleFirst(1, TimeUnit.SECONDS)//每1秒中采用數(shù)據(jù)
        .subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "開(kāi)始采用subscribe連接");
            }

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "對(duì)Error事件作出響應(yīng)");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "對(duì)Complete事件作出響應(yīng)");
            }
        });

結(jié)果：

2022-05-05 15:27:20.009 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 開(kāi)始采用subscribe連接
2022-05-05 15:27:20.009 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件1
2022-05-05 15:27:21.214 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件4
2022-05-05 15:27:22.218 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件7
2022-05-05 15:27:23.121 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 對(duì)Complete事件作出響應(yīng)

throttleLast/sample

Observable.create(new ObservableOnSubscribe<Integer>() {
    @Override
    public void subscribe(ObservableEmitter<Integer> e) throws Exception {
        // 隔段事件發(fā)送時(shí)間
        e.onNext(1);
        Thread.sleep(500);

        e.onNext(2);
        Thread.sleep(400);

        e.onNext(3);
        Thread.sleep(300);

        e.onNext(4);
        Thread.sleep(300);

        e.onNext(5);
        Thread.sleep(300);

        e.onNext(6);
        Thread.sleep(400);

        e.onNext(7);
        Thread.sleep(300);
        e.onNext(8);

        Thread.sleep(300);
        e.onNext(9);

        Thread.sleep(300);
        e.onComplete();
    }
}).throttleLast(1, TimeUnit.SECONDS)//每1秒中采用數(shù)據(jù)
        .subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "開(kāi)始采用subscribe連接");
            }

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "對(duì)Error事件作出響應(yīng)");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "對(duì)Complete事件作出響應(yīng)");
            }
        });

結(jié)果：

2022-05-05 15:27:23.124 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 開(kāi)始采用subscribe連接
2022-05-05 15:27:24.129 3744-3924/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件3
2022-05-05 15:27:25.129 3744-3924/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件6
2022-05-05 15:27:26.129 3744-3924/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件9
2022-05-05 15:27:26.234 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 對(duì)Complete事件作出響應(yīng)

throttleWithTimeout/debounce

Observable.create(new ObservableOnSubscribe<Integer>() {
            @Override
            public void subscribe(ObservableEmitter<Integer> e) throws Exception {
                // 隔段事件發(fā)送時(shí)間
                e.onNext(1);
                Thread.sleep(500);
                e.onNext(2); // 1和2之間的間隔小于指定時(shí)間1s，所以前1次數(shù)據(jù)（1）會(huì)被拋棄，2會(huì)被保留
                Thread.sleep(1500);  // 因?yàn)?和3之間的間隔大于指定時(shí)間1s，所以之前被保留的2事件將發(fā)出
                e.onNext(3);
                Thread.sleep(1500);  // 因?yàn)?和4之間的間隔大于指定時(shí)間1s，所以3事件將發(fā)出
                e.onNext(4);
                Thread.sleep(500); // 因?yàn)?和5之間的間隔小于指定時(shí)間1s，所以前1次數(shù)據(jù)（4）會(huì)被拋棄，5會(huì)被保留
                e.onNext(5);
                Thread.sleep(500); // 因?yàn)?和6之間的間隔小于指定時(shí)間1s，所以前1次數(shù)據(jù)（5）會(huì)被拋棄，6會(huì)被保留
                e.onNext(6);
                Thread.sleep(1500); // 因?yàn)?和Complete實(shí)踐之間的間隔大于指定時(shí)間1s，所以之前被保留的6事件將發(fā)出

                e.onComplete();
            }
        }).throttleWithTimeout(1, TimeUnit.SECONDS)//每1秒中采用數(shù)據(jù)
                .subscribe(new Observer<Integer>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(Integer value) {
                        Log.d(TAG, "接收到了事件"+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "對(duì)Error事件作出響應(yīng)");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "對(duì)Complete事件作出響應(yīng)");
                    }
                });

結(jié)果：

2022-05-05 15:21:14.416 3428-3490/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件2
2022-05-05 15:21:15.916 3428-3490/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件3
2022-05-05 15:21:18.420 3428-3490/com.alsan.rxjavademo D/RxFilterSymbolActivity: 接收到了事件6
2022-05-05 15:21:18.920 3428-3428/com.alsan.rxjavademo D/RxFilterSymbolActivity: 對(duì)Complete事件作出響應(yīng)

4. 根據(jù)"指定事件位置"過(guò)濾事件

操作符	作用
firstElement	僅選取第1個(gè)元素
lastElement	僅選取最后一個(gè)元素
elementAt	指定接收某個(gè)元素（通過(guò) 索引值確定）
elementAtOrError	在elementAt（）的基礎(chǔ)上，當(dāng)出現(xiàn)越界情況（即獲取的位置索引＞發(fā)送事件序列長(zhǎng)度）時(shí)，即拋出異常

firstElement

Observable.just("hello", 1, "haha", 2).firstElement().subscribe((Consumer<Serializable>) serializable -> {
    Log.d(TAG, serializable.toString());
});

結(jié)果：

2022-05-05 15:38:09.536 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: hello

lastElement

Observable.just("hello", 1, "haha", 2).lastElement().subscribe((Consumer<Serializable>) serializable -> {
  Log.d(TAG, serializable.toString());
});

結(jié)果：

2022-05-05 15:38:22.242 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: 2

elementAt

Observable.just(1,2,2,4,4,5,6, 1).elementAt(1).subscribe(new Consumer<Integer>() {
    @Override
    public void accept(Integer integer) throws Throwable {
        Log.d(TAG, "accept:" + integer);
    }
});

結(jié)果：

2022-05-05 15:39:14.759 3744-3744/com.alsan.rxjavademo D/RxFilterSymbolActivity: accept:2

elementAtOrError

Observable.just(1,2,3,4,5).elementAtOrError(9).subscribe(new SingleObserver<Integer>() {
    @Override
    public void onSubscribe(@NonNull Disposable d) {
        Log.d(TAG, "onSubscribe...");
    }

    @Override
    public void onSuccess(@NonNull Integer integer) {
        Log.d(TAG, "onSuccess..." + integer);
    }

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

結(jié)果：

022-05-05 15:41:16.713 4285-4285/com.alsan.rxjavademo D/RxFilterSymbolActivity: onSubscribe...
2022-05-05 15:41:16.715 4285-4285/com.alsan.rxjavademo D/RxFilterSymbolActivity: onError:java.util.NoSuchElementException
        at io.reactivex.rxjava3.internal.operators.observable.ObservableElementAtSingle$ElementAtObserver.onComplete(ObservableElementAtSingle.java:115)
        at io.reactivex.rxjava3.internal.operators.observable.ObservableFromArray$FromArrayDisposable.run(ObservableFromArray.java:112)
        at io.reactivex.rxjava3.internal.operators.observable.ObservableFromArray.subscribeActual(ObservableFromArray.java:38)
        at io.reactivex.rxjava3.core.Observable.subscribe(Observable.java:13095)
        at io.reactivex.rxjava3.internal.operators.observable.ObservableElementAtSingle.subscribeActual(ObservableElementAtSingle.java:37)
        at io.reactivex.rxjava3.core.Single.subscribe(Single.java:4813)
        at com.alsan.rxjavademo.RxFilterSymbolActivity.lambda$onCreate$17$RxFilterSymbolActivity(RxFilterSymbolActivity.java:311)
        at com.alsan.rxjavademo.-$$Lambda$RxFilterSymbolActivity$bbHK8cGk2DGgxkmEzj5endgLd8A.onClick(Unknown Source:2)
        at android.view.View.performClick(View.java:6291)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:967)
        at android.view.View$PerformClick.run(View.java:24931)
        at android.os.Handler.handleCallback(Handler.java:808)
        at android.os.Handler.dispatchMessage(Handler.java:101)
        at android.os.Looper.loop(Looper.java:166)
        at android.app.ActivityThread.main(ActivityThread.java:7529)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)

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Rxjava3使用教程：操作符-過(guò)濾

Rxjava3使用教程：操作符-過(guò)濾

過(guò)濾操作符

根據(jù)應(yīng)用場(chǎng)景對(duì)過(guò)濾操作符進(jìn)行分類，可分成以下4個(gè)類別：

1. 根據(jù)"指定條件"過(guò)濾事件

2. 根據(jù)"指定事件數(shù)量"過(guò)濾事件

3. 根據(jù)"指定時(shí)間"過(guò)濾事件

4. 根據(jù)"指定事件位置"過(guò)濾事件

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友情鏈接更多精彩內(nèi)容

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Rxjava3使用教程：操作符-過(guò)濾

過(guò)濾操作符

根據(jù)應(yīng)用場(chǎng)景對(duì)過(guò)濾操作符進(jìn)行分類，可分成以下4個(gè)類別：

1. 根據(jù)"指定條件"過(guò)濾事件

2. 根據(jù)"指定事件數(shù)量"過(guò)濾事件

3. 根據(jù)"指定時(shí)間"過(guò)濾事件

4. 根據(jù)"指定事件位置"過(guò)濾事件

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

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