RxJava部分操作符

package qianxingzhe.rxjava_learning;

import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import rx.Observable;
import rx.Observer;
import rx.Scheduler;
import rx.Subscriber;
import rx.Subscription;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Action1;
import rx.functions.Func1;
import rx.schedulers.Schedulers;

/**
 * Created by lunyi.yly on 16/8/6.
 */

public class RxJavaText {

    @Test
    public void hello_world_01() {
        Observable<String> observable = Observable.create(new Observable.OnSubscribe<String>() {
            @Override
            public void call(Subscriber<? super String> subscriber) {
                subscriber.onNext("Hello, World!");
                subscriber.onCompleted();
            }
        });

        Subscriber<String> subscriber = new Subscriber<String>() {
            @Override
            public void onCompleted() {
                System.out.println("onCompleted()");
            }

            @Override
            public void onError(Throwable e) {
                System.out.println("onError()");
            }

            @Override
            public void onNext(String s) {
                System.out.println("onNext()");
                System.out.println(s);
            }
        };

        observable.subscribe(subscriber);
    }

    @Test
    public void hello_world_02() {
        Observable<String> observable = Observable.create(new Observable.OnSubscribe<String>() {
            @Override
            public void call(Subscriber<? super String> subscriber) {
                subscriber.onNext("Hello, World!");
                subscriber.onCompleted();
            }
        });

        Observer<String> observer = new Observer<String>() {
            @Override
            public void onCompleted() {
                System.out.println("onCompleted()");
            }

            @Override
            public void onError(Throwable e) {
                System.out.println("onError()");
            }

            @Override
            public void onNext(String s) {
                System.out.println("onNext()");
                System.out.println("s");
            }
        };

        observable.subscribe(observer);
    }

    @Test
    public void just_01() {
        Observable<String> observable = Observable.just("hello world");

        Action1<String> action1 = new Action1<String>() {
            @Override
            public void call(String s) {
                System.out.println(s);
            }
        };

        observable.subscribe(action1);
    }

    /**
     * just 用来创建只发出一个事件就结束的Observable对象
     */
    @Test
    public void just_02() {
        Observable.just("hello world").subscribe(new Action1<String>() {
            @Override
            public void call(String s) {
                System.out.println(s);
            }
        });
    }

    /**
     * map 把一个事件转换为另一个事件
     */
    @Test
    public void map() {
        Observable.just("hello world")
                .map(new Func1<String, Integer>() {
                    @Override
                    public Integer call(String s) {
                        return s.hashCode();
                    }
                })
                .subscribe(new Action1<Integer>() {
                    @Override
                    public void call(Integer integer) {
                        System.out.println(integer);
                    }
                });
    }

    /**
     * from 接收一个集合作为输入,然后每次输出一个元素给subscriber
     */
    @Test
    public void from() {
        Observable.from(new String[]{"hello", "world"})
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                });
    }

    /**
     * flatMap 接收一个Observable的输出作为输入，同时输出另外一个Observable
     */
    @Test
    public void flatmap() {
        List<List<String>> lists = new ArrayList<>();
        Observable.from(lists)
                .flatMap(new Func1<List<String>, Observable<String>>() {
                    @Override
                    public Observable<String> call(List<String> strings) {
                        return Observable.from(strings);
                    }
                })
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                });
    }

    /**
     * filter 输出和输入相同的元素，并且会过滤掉那些不满足检查条件的
     */
    @Test
    public void filter() {
        Observable.from(new String[]{"hello", "world"})
                .flatMap(new Func1<String, Observable<String>>() {
                    @Override
                    public Observable<String> call(String s) {
                        return Observable.just(s);
                    }
                })
                .filter(new Func1<String, Boolean>() {
                    @Override
                    public Boolean call(String s) {
                        return s.equals("hello");
                    }
                })
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                });
    }

    /**
     * take 输出最多指定数量的结果
     */
    @Test
    public void take() {
        Observable.from(new Integer[]{1, 2, 3, 4, 5,})
                .take(3)
                .subscribe(new Action1<Integer>() {
                    @Override
                    public void call(Integer integer) {
                        System.out.println(integer);
                    }
                });
    }

    /**
     * doOnNext 允许我们在每次输出一个元素之前做一些额外的事情，比如这里的保存标题。
     */
    @Test
    public void doOnNext() {
        Observable.just("hello world")
                .doOnNext(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                })
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                });
    }

    /**
     * subscribeOn 指定被观察者代码运行的线程
     * ObserverOn 指定观察者运行的线程
     */
    @Test
    public void subscribeOn_ObserverOn() {
        Observable.just("http://www.baidu.com")
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println("在UI线程执行");
                    }
                });

    }

    /**
     * unsubscribe 在他当前执行的地方终止
     */
    @Test
    public void unsubscribe() {
        Subscription subscribe = Observable.just("hello world")
                .subscribe(new Action1<String>() {
                    @Override
                    public void call(String s) {
                        System.out.println(s);
                    }
                });
        subscribe.unsubscribe();
        System.out.println(subscribe.isUnsubscribed());

    }
}