我的RxJava之旅 三

Observable.defer: 創建一個返回Observable的Observable方法

public static void test7(){
        // observable這個對象是沒有什麼作用的 每訂閱一次其內部就會創建一個observable
        Observable<Integer> observable = Observable.defer(new Func0<Observable<Integer>>() {
            @Override
            public Observable<Integer> call() {
                Log.v(TAG,"...call.. = ");
                Observable<Integer> observable1 = Observable.create(new Observable.OnSubscribe<Integer>() {
                    @Override
                    public void call(Subscriber<? super Integer> subscriber) {
                        subscriber.onNext(1);

                    }
                });


                return observable1;
            }
        });

        observable.subscribe(new Action1<Integer>() {
            @Override
            public void call(Integer integer) {
                Log.v(TAG,"...integer.. = " + integer);
            }
        });

    }

just: 被觀察者發送事件的簡便方法

public static void test8() {
        Observable
                // 我們其實就打印了兩句話 代碼卻這麼多 所以有just簡便方法
                /*.create(new Observable.OnSubscribe<String>() {
                    @Override
                    public void call(Subscriber<? super String> subscriber) {
                        if (!subscriber.isUnsubscribed()) {
                            subscriber.onNext("人醜就要多讀書");
                            subscriber.onNext("人醜就要多讀書222");
                            subscriber.onCompleted();

                        }
                    }
                })*/
                .just("人醜就要多讀書","人醜就要多讀書222") // 而且just方法完成後會自動調用oncompleted方法
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        Log.v(TAG, "...s.. = " + s);
                    }
                });

    }

form: 上面說到的just最多可以接受9個參數,那麼form接受的就是一個數組

public static void test9() {
        List<String> list = new ArrayList<>();
        list.add("人醜就要多讀書1");
        list.add("人醜就要多讀書2");
        list.add("人醜就要多讀書3");
        list.add("人醜就要多讀書4");

        Observable
                .from(list)
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        Log.v(TAG, "...s.. = " + s);
                    }
                });

    }

定時器:Timer/ Interval 

public static void test10() {
        Observable
                .interval(3, TimeUnit.SECONDS, Schedulers.io())
                .subscribe(new Action1<Long>() {
                    @Override
                    public void call(Long aLong) {
                        Log.v(TAG, "...thread..1 = " + Thread.currentThread().getName());
                    }
                });

        Observable.timer(3,TimeUnit.SECONDS,Schedulers.io()).subscribe(new Action1<Long>() {
            @Override
            public void call(Long aLong) {
                Log.v(TAG, "...thread..2 = " + Thread.currentThread().getName());
            }
        });
    }// 以上兩種選擇一種就可以了

range/repeat 操作數字或者重複發生事件

public static void test11() {
        // 操作數字也可以重複發生事件
        Observable
                .range(0,10)
                .subscribe(new Action1<Integer>() {
                    @Override
                    public void call(Integer integer) {
                        Log.v(TAG, "...call = " +integer);
                    }
                });

        Observable
                .just("人醜就要多讀書")
                .repeat(3) // 重複三遍
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        Log.v(TAG, "...call = " +s);
                    }
                });

    }

Delay 發送數據延時

public static void test12() {
        Observable
                .just("起牀","洗臉","刷牙")
                .delay(3,TimeUnit.SECONDS)// 這裏的延時是整體發送的延時
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        Log.v(TAG, "...call = " +s);
                    }
                });
    }