RxJava 复杂场景 Schedulers调度

参考： https://blog.piasy.com/2016/10/14/Complex-RxJava-2-scheduler/

以Zip为例，学习Schedulers的线程调度

要求：

        * create 里的代码在 io 线程执行，
        * zip 合并的代码在主线程执行，
        * map 的操作在 io 线程执行，
        * subscriber 的代码在主线程执行。

        Observable<Integer> odd = Observable.create(new Observable.OnSubscribe<Integer>() {

            @Override
            public void call(Subscriber<? super Integer> subscriber) {
                System.out.println("1. create odd @ " + Thread.currentThread().getName());
                subscriber.onNext(1);
                subscriber.onCompleted();
            }
        });

        Observable<Integer> even = Observable.create(new Observable.OnSubscribe<Integer>() {

            @Override
            public void call(Subscriber<? super Integer> subscriber) {
                System.out.println("2. create even @ " + Thread.currentThread().getName());
                subscriber.onNext(2);
                subscriber.onCompleted();
            }
        });

        Observable.zip(
                // 決定--> zip 合并的代码在主线程执行
                odd.observeOn(AndroidSchedulers.mainThread()),
                even,
                new Func2<Integer, Integer, Integer>() {
                    @Override
                    public Integer call(Integer integer, Integer integer2) {
                        System.out.println("3. zip @ " + Thread.currentThread().getName());
                        return integer + integer2;
                    }
                })
                // 決定--> create 里的代码在 io 线程执行
                .subscribeOn(Schedulers.io())
                // 決定--> map 的操作在 io 线程执行
                .observeOn(Schedulers.io())
                .map(new Func1<Integer, String>() {
                    @Override
                    public String call(Integer integer) {
                        System.out.println("4. map @ " + Thread.currentThread().getName());
                        return "" + integer;
                    }
                })
                // 決定--> subscriber 的代码在主线程执行
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String str) {
                        System.out.println("5. subscribe @ " + Thread.currentThread().getName());
                    }
                });

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