Android-->RxJava2更新体验

compile ‘io.reactivex:rxjava:1.2.7’ 
compile ‘io.reactivex:rxandroid:1.2.1’

compile “io.reactivex.rxjava2:rxjava:2.0.7” 
compile “io.reactivex.rxjava2:rxandroid:2.0.1”

CompositeSubscription compositeSubscription = new CompositeSubscription();
Observable<String> observable = Observable.create(new Observable.OnSubscribe<String>() {
    @Override
    public void call(Subscriber<? super String> subscriber) {
        subscriber.onNext("1");
        subscriber.onNext("2");
        //e.onComplete();
        subscriber.onError(new NullPointerException());
    }
});
Subscription subscribe = observable.subscribe(new Observer<String>() {
    @Override
    public void onCompleted() {

    }

    @Override
    public void onError(Throwable e) {

    }

    @Override
    public void onNext(String s) {

    }
});

//取消订阅
subscribe.unsubscribe();
//或者
compositeSubscription.add(subscribe);
compositeSubscription.unsubscribe();

final CompositeDisposable compositeDisposable = new CompositeDisposable();
Observable<String> observable = Observable.create(new ObservableOnSubscribe<String>() {
    @Override
    public void subscribe(ObservableEmitter<String> e) throws Exception {
        e.onNext("1");
        e.onNext("2");
        //e.onComplete();
        e.onError(new NullPointerException());
    }
});

//subscribe方法返回void类型
observable.subscribe(new Observer<String>() {
    @Override
    public void onSubscribe(Disposable d) {
        compositeDisposable.add(d);
    }

    @Override
    public void onNext(String s) {

    }

    @Override
    public void onError(Throwable e) {

    }

    @Override
    public void onComplete() {

    }
});

compositeDisposable.dispose();

Flowable<String> stringFlowable = Flowable
       .create(new FlowableOnSubscribe<String>() {
           @Override
           public void subscribe(FlowableEmitter<String> e) throws Exception {
               e.onNext("1");
               e.onNext("2");
               e.onComplete();
               //e.onError(new NullPointerException());
           }
       }, BackpressureStrategy.ERROR)
       .subscribeOn(Schedulers.newThread())
       .observeOn(Schedulers.newThread());

stringFlowable.subscribe(new Subscriber<String>() {
   @Override
   public void onSubscribe(Subscription s) {
       //s.request(1);
       // 参数表示接受多少次onNext回调.
       // 当onNext回调次数和这个参数不一致时, 则通过BackpressureStrategy.ERROR参数决定之后的处理
       // 不调用等价于request(0).
       // 典型的错误MissingBackpressureException异常
       // 注意: Flowable请尽量在异步线程使用,否则很容易出现MissingBackpressureException异常
   }

   @Override
   public void onNext(String s) {
   }

   @Override
   public void onError(Throwable t) {
   }

   @Override
   public void onComplete() {
   }
});