RxJava2.X版本-map语法

一、map语法练习

1、Obserable创建

  public Observable getRxJavaCreateExampleData() {
        return Observable.create(new ObservableOnSubscribe() {
            @Override
            public void subscribe(ObservableEmitter emitter) {
                LogUtils.debug(TAG, "getRxJavaCreateExampleData---:"+Thread.currentThread().getName()+"--:" + 1);
                emitter.onNext(1);

                LogUtils.debug(TAG, "getRxJavaCreateExampleData---:" +Thread.currentThread().getName()+"--:"+ 2);
                emitter.onNext(2);

                LogUtils.debug(TAG, "getRxJavaCreateExampleData---:"+Thread.currentThread().getName()+"--:" + 3);
                emitter.onNext(3);
                emitter.onComplete();
                LogUtils.debug(TAG, "getRxJavaCreateExampleData---:" +Thread.currentThread().getName()+"--:"+ 4);
                emitter.onNext(4);

            }
        });
    }

2、观察者-Consumer创建

   public void rxJavaMapExpamle() {
        Disposable subscribe = model.getRxJavaCreateExampleData()
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .map(new Function() {
                    @Override
                    public String apply(Integer integer) throws Exception {
                        LogUtils.error(TAG, "rxJavaMapExpamle--Function--:"+Thread.currentThread().getName()+"--:" + integer);
                        return "this is from map " + integer;
                    }
                }).subscribe(new Consumer() {
                    @Override
                    public void accept(String s) throws Exception {
                        LogUtils.error(TAG, "rxJavaMapExpamle--Consumer--:"+Thread.currentThread().getName()+"--:" + s);
                    }
                });
        compositeDisposable.add(subscribe);
    }

3、日志

08-08 14:09:57.556 13443-14015/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:1
08-08 14:09:57.557 13443-14015/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:2
    getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:3
    getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:4
08-08 14:09:57.557 13443-13443/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Function--:main--:1
    rxJavaMapExpamle--Consumer--:main--:this is from map 1
    rxJavaMapExpamle--Function--:main--:2
08-08 14:09:57.558 13443-13443/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Consumer--:main--:this is from map 2
    rxJavaMapExpamle--Function--:main--:3
    rxJavaMapExpamle--Consumer--:main--:this is from map 3

总结

1、map 基本作用就是将一个 Observable 通过某种函数关系，转换为另一种 Observable，上面例子中就是把我们的 Integer 数据变成了 String 类型

二、修改线程调度

  public void rxJavaMapExpamle() {
        Disposable subscribe = model.getRxJavaCreateExampleData()
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .map(new Function() {
                    @Override
                    public String apply(Integer integer) throws Exception {
                        LogUtils.error(TAG, "rxJavaMapExpamle--Function--:" + Thread.currentThread().getName() + "--:" + integer);
                        return "this is from map " + integer;
                    }
                })
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer() {
                    @Override
                    public void accept(String s) throws Exception {
                        LogUtils.error(TAG, "rxJavaMapExpamle--Consumer--:" + Thread.currentThread().getName() + "--:" + s);
                    }
                });
        compositeDisposable.add(subscribe);
    }

日志

08-08 14:12:58.857 14348-14738/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:1
08-08 14:12:58.857 14348-14738/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Function--:RxCachedThreadScheduler-1--:1
08-08 14:12:58.857 14348-14738/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:2
08-08 14:12:58.857 14348-14738/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Function--:RxCachedThreadScheduler-1--:2
08-08 14:12:58.857 14348-14738/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:3
08-08 14:12:58.857 14348-14738/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Function--:RxCachedThreadScheduler-1--:3
08-08 14:12:58.858 14348-14738/com.example.zhang D/MainModel: getRxJavaCreateExampleData---:RxCachedThreadScheduler-1--:4
08-08 14:12:58.860 14348-14348/com.example.zhang E/MainPresenter: rxJavaMapExpamle--Consumer--:main--:this is from map 1
    rxJavaMapExpamle--Consumer--:main--:this is from map 2
    rxJavaMapExpamle--Consumer--:main--:this is from map 3