RxJava和RxAndroid

现在RxJava和RxAndroid越来越火爆,自己在业余时间也学习了一下,感觉确实很好用,之前 为了完成页面刷新,数据请求,组件信息传递的时候,要使用handler,真的是逻辑思路很强,稍微不注意,就各种错误一大堆。这下有了RxJava和RxAndroid,真的爽。
RxJava

网上有很多给RxJava做定义的,很多人说的比较官方,而我是比较笨的那种人,所以看了很久也没有看懂,不过最后在一个博客中,看到

    RxJava就是异步

我决定这句话概括的还是非常好的!!!

 


不过我们还是要来先看一下官方给出的定义
定义

    RxJava:a library for composing asynchronous and event-based programs using observable sequences for the Java VM
    // 翻译:RxJava 是一个在 Java VM 上使用可观测的序列来组成异步的、基于事件的程序的库

所以说,RxJava 是一个 基于事件流、实现异步操作的库
特点:

RxJava的使用方式是:基于事件流的链式调用
1. 逻辑简洁
2. 实现优雅
3. 使用简单
更重要的是,随着程序逻辑的复杂性提高,它依然能够保持简洁 & 优雅
原理

这个地方使用的是别人的例子,我觉得很好
顾客到餐厅吃饭

 

 

RxJava是一种基于扩展的观察者模式
在RxJava中有四种角色:
角色     作用     类比
被观察者(Observable)     产生事件     顾客
观察者(Observer)     接收事件,并给出响应动作     厨房
订阅(Subscribe)     连接 被观察者 & 观察者     服务员
事件(Event)     被观察者 & 观察者 沟通的载体     菜式

 

 


即RxJava原理可总结为:被观察者 (Observable) 通过 订阅(Subscribe) 按顺序发送事件(Event) 给观察者 (Observer), 观察者(Observer) 按顺序接收事件 & 作出对应的响应动作。具体如下图

 


配置

compile 'io.reactivex.rxjava2:rxjava:2.0.1'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'

RxJava的使用

使用方式:
1. 分步骤实现:该方法主要为了深入说明Rxjava的原理 & 使用,主要用于演示说明
2. 基于事件流的链式调用:主要用于实际使用
分步实现的步骤


    创建被观察者(Obserable)和生产事件
        即:顾客-坐下餐桌-点菜
        具体实现:

// 1. 创建被观察者 Observable 对象
        Observable<Integer> observable = Observable.create(new ObservableOnSubscribe<Integer>() {
          // create() 是 RxJava 最基本的创造事件序列的方法
          // 此处传入了一个 OnSubscribe 对象参数
          // 当 Observable 被订阅时,OnSubscribe 的 call() 方法会自动被调用,即事件序列就会依照设定依次被触发
          // 即观察者会依次调用对应事件的复写方法从而响应事件
          // 从而实现被观察者调用了观察者的回调方法 & 由被观察者向观察者的事件传递,即观察者模式

        // 2. 在复写的subscribe()里定义需要发送的事件
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                // 通过 ObservableEmitter类对象产生事件并通知观察者
                // ObservableEmitter类介绍
                    // a. 定义:事件发射器
                    // b. 作用:定义需要发送的事件 & 向观察者发送事件
                emitter.onNext(1);
                emitter.onNext(2);
                emitter.onNext(3);
                emitter.onComplete();
            }
        });


        <--扩展:RxJava 提供了其他方法用于 创建被观察者对象Observable -->
// 方法1:just(T...):直接将传入的参数依次发送出来
  Observable observable = Observable.just("A", "B", "C");
  // 将会依次调用:
  // onNext("A");
  // onNext("B");
  // onNext("C");
  // onCompleted();

// 方法2:from(T[]) / from(Iterable<? extends T>) : 将传入的数组 / Iterable 拆分成具体对象后,依次发送出来
  String[] words = {"A", "B", "C"};
  Observable observable = Observable.from(words);
  // 将会依次调用:
  // onNext("A");
  // onNext("B");
  // onNext("C");
  // onCompleted();


    关于onComplete和onError唯一并且互斥这一点, 是需要自行在代码中进行控制, 如果你的代码逻辑中违背了这个规则, 并不一定会导致程序崩溃. 比如发送多个onComplete是可以正常运行的, 依然是收到第一个onComplete就不再接收了, 但若是发送多个onError, 则收到第二个onError事件会导致程序会崩溃.

    创建观察者 (Observer )并 定义响应事件的行为
        即 开厨房 - 确定对应菜式
        发生的事件类型包括:Next事件、Complete事件 & Error事件
        

 


        具体实现:

//方式1:采用Observer 接口 -- >
        // 1. 创建观察者 (Observer )对象
        Observer<Integer> observer = new Observer<Integer>() {
            // 2. 创建对象时通过对应复写对应事件方法 从而 响应对应事件

            // 观察者接收事件前,默认最先调用复写 onSubscribe()
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }

            // 当被观察者生产Next事件 & 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "对Next事件作出响应" + value);
            }

            // 当被观察者生产Error事件& 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            // 当被观察者生产Complete事件& 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }
        };

        //方式2:采用Subscriber 抽象类 -- >
        // 说明:Subscriber类 = RxJava 内置的一个实现了 Observer 的抽象类,对 Observer 接口进行了扩展

        // 1. 创建观察者 (Observer )对象
        Subscriber<String> subscriber = new Subscriber<Integer>() {

            // 2. 创建对象时通过对应复写对应事件方法 从而 响应对应事件
            // 观察者接收事件前,默认最先调用复写 onSubscribe()
            @Override
            public void onSubscribe(Subscription s) {
                Log.d(TAG, "开始采用subscribe连接");
            }

            // 当被观察者生产Next事件 & 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "对Next事件作出响应" + value);
            }

            // 当被观察者生产Error事件& 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            // 当被观察者生产Complete事件& 观察者接收到时,会调用该复写方法 进行响应
            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }
        };

        //特别注意:2 种方法的区别,即Subscriber 抽象类与Observer 接口的区别-- >
        // 相同点:二者基本使用方式完全一致(实质上,在RxJava的 subscribe 过程中,Observer总是会先被转换成Subscriber再使用)
        // 不同点:Subscriber抽象类对 Observer 接口进行了扩展,新增了两个方法:
        // 1. onStart():在还未响应事件前调用,用于做一些初始化工作
        // 2. unsubscribe():用于取消订阅。在该方法被调用后,观察者将不再接收 & 响应事件
        // 调用该方法前,先使用 isUnsubscribed() 判断状态,确定被观察者Observable是否还持有观察者Subscriber的引用,如果引用不能及时释放,就会出现内存泄露


    通过订阅(Subscribe)连接观察者和被观察者
        顾客找到服务员 - 点菜 - 服务员下单到厨房 - 厨房烹调
        具体实现:

observable.subscribe(observer);
 // 或者 observable.subscribe(subscriber);
 ```
 扩展说明:
 ```
 <-- Observable.subscribe(Subscriber) 的内部实现 -->

public Subscription subscribe(Subscriber subscriber) {
    subscriber.onStart();
    // 步骤1中 观察者  subscriber抽象类复写的方法,用于初始化工作
    onSubscribe.call(subscriber);
    // 通过该调用,从而回调观察者中的对应方法从而响应被观察者生产的事件
    // 从而实现被观察者调用了观察者的回调方法 & 由被观察者向观察者的事件传递,即观察者模式
    // 同时也看出:Observable只是生产事件,真正的发送事件是在它被订阅的时候,即当 subscribe() 方法执行时
}

基于事件流的链式调用

在实际应用中,会将上述步骤&代码连在一起,从而更加简洁、更加优雅,即所谓的 RxJava基于事件流的链式调用

// RxJava的链式操作
        Observable.create(new ObservableOnSubscribe<Integer>() {
        // 1. 创建被观察者 & 生产事件
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                emitter.onNext(1);
                emitter.onNext(2);
                emitter.onNext(3);
                emitter.onComplete();
            }
        }).subscribe(new Observer<Integer>() {
            // 2. 通过通过订阅(subscribe)连接观察者和被观察者
            // 3. 创建观察者 & 定义响应事件的行为
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }
            // 默认最先调用复写的 onSubscribe()

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "对Next事件"+ value +"作出响应"  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }

        });
    }
}

    注意:整体方法调用顺序:观察者.onSubscribe()> 被观察者.subscribe()> 观察者.onNext()>观察者.onComplete()

随着程序逻辑的复杂性提高,它依然能够保持简洁 & 优雅。所以,一般建议使用这种基于事件流的链式调用方式实现RxJava
RxJava 2.x 提供了多个函数式接口 ,用于实现简便式的观察者模式

 


以consumer为例,实现观察者模式 Observable.just(
"hello").subscribe(new Consumer<String>() { // 每次接收到Observable的事件都会调用Consumer.accept() @Override public void accept(String s) throws Exception { System.out.println(s); } }); 实际使用 使用分步实现 package com.paulniu.rxjavademo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import org.reactivestreams.Subscriber; import org.reactivestreams.Subscription; import io.reactivex.Observable; import io.reactivex.ObservableEmitter; import io.reactivex.ObservableOnSubscribe; import io.reactivex.Observer; import io.reactivex.disposables.Disposable; public class MainActivity extends AppCompatActivity { public static final String TAG = "MainActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //1.创建观察者Observable对象 Observable<Integer>observable = Observable.create(new ObservableOnSubscribe<Integer>() { @Override public void subscribe(ObservableEmitter<Integer> e) throws Exception { // 在复写的subscribe()里定义需要发送的事件 // 通过 ObservableEmitter类对象产生事件并通知观察者 // ObservableEmitter类介绍 // a. 定义:事件发射器 // b. 作用:定义需要发送的事件 & 向观察者发送事件 e.onNext(1); e.onNext(2); e.onNext(3); //完成发送 e.onComplete(); } }); //2:创建观察者 Observer 并 定义响应事件行为 Observer<Integer>observer = new Observer<Integer>() { // 通过复写对应方法来 响应 被观察者 @Override public void onSubscribe(Disposable d) { // 默认最先调用复写的 onSubscribe() Log.d(TAG, "开始采用subscribe连接"); } @Override public void onNext(Integer value) { Log.d(TAG, "对Next事件"+ value +"作出响应" ); } @Override public void onError(Throwable e) { Log.d(TAG, "对Error事件作出响应"); } @Override public void onComplete() { Log.d(TAG, "对Complete事件作出响应"); } }; //3:通过订阅(subscribe)连接观察者和被观察者 observable.subscribe(observer); } } 实验结果:

 


基于事件流的链式调用方式
// RxJava的流式操作 Observable.create(new ObservableOnSubscribe<Integer>() { // 1. 创建被观察者 & 生产事件 @Override public void subscribe(ObservableEmitter<Integer> emitter) throws Exception { emitter.onNext(1); emitter.onNext(2); emitter.onNext(3); emitter.onComplete(); } }).subscribe(new Observer<Integer>() { // 2. 通过通过订阅(subscribe)连接观察者和被观察者 // 3. 创建观察者 & 定义响应事件的行为 @Override public void onSubscribe(Disposable d) { Log.d(TAG, "开始采用subscribe连接"); } // 默认最先调用复写的 onSubscribe() @Override public void onNext(Integer value) { Log.d(TAG, "对Next事件"+ value +"作出响应" ); } @Override public void onError(Throwable e) { Log.d(TAG, "对Error事件作出响应"); } @Override public void onComplete() { Log.d(TAG, "对Complete事件作出响应"); } }); 实现效果和上图一样 除了此之外,观察者Observer的subscribe()具有重载方法 public final Disposable subscribe() {} // 表示观察者不对被观察者发送的事件作出任何响应(但被观察者还是可以继续发送事件) public final Disposable subscribe(Consumer<? super T> onNext) {} // 表示观察者只对被观察者发送的Next事件作出响应 public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError) {} // 表示观察者只对被观察者发送的Next事件 & Error事件作出响应 public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete) {} // 表示观察者只对被观察者发送的Next事件、Error事件 & Complete事件作出响应 public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete, Consumer<? super Disposable> onSubscribe) {} // 表示观察者只对被观察者发送的Next事件、Error事件 、Complete事件 & onSubscribe事件作出响应 public final void subscribe(Observer<? super T> observer) {} // 表示观察者对被观察者发送的任何事件都作出响应 可采用 Disposable.dispose() 切断观察者 与 被观察者 之间的连接 即观察者 无法继续 接收 被观察者的事件,但被观察者还是可以继续发送事件 // 主要在观察者 Observer中 实现 Observer<Integer> observer = new Observer<Integer>() { // 1. 定义Disposable类变量 private Disposable mDisposable; @Override public void onSubscribe(Disposable d) { Log.d(TAG, "开始采用subscribe连接"); // 2. 对Disposable类变量赋值 mDisposable = d; } @Override public void onNext(Integer value) { Log.d(TAG, "对Next事件"+ value +"作出响应" ); if (value == 2) { // 设置在接收到第二个事件后切断观察者和被观察者的连接 mDisposable.dispose(); Log.d(TAG, "已经切断了连接:" + mDisposable.isDisposed()); } } @Override public void onError(Throwable e) { Log.d(TAG, "对Error事件作出响应"); } @Override public void onComplete() { Log.d(TAG, "对Complete事件作出响应"); } }; 运行结果

 


RxJava的操作符

作用:创建被观察者对象(Observable)和发送事件

 


基本创建

完整创建一个被观察者,同时也是创建被观察者对象最基本的操作符
create()

具体使用

/ **
   * 1. 通过creat()创建被观察者 Observable 对象
   */ 
        Observable<Integer> observable = Observable.create(new ObservableOnSubscribe<Integer>() {
          // 传入参数: OnSubscribe 对象
          // 当 Observable 被订阅时,OnSubscribe 的 call() 方法会自动被调用,即事件序列就会依照设定依次被触发
          // 即观察者会依次调用对应事件的复写方法从而响应事件
          // 从而实现由被观察者向观察者的事件传递 & 被观察者调用了观察者的回调方法 ,即观察者模式
/ **
   * 2. 在复写的subscribe()里定义需要发送的事件
   */ 
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {
                // 通过 ObservableEmitter类对象 产生 & 发送事件
                // ObservableEmitter类介绍
                    // a. 定义:事件发射器
                    // b. 作用:定义需要发送的事件 & 向观察者发送事件
                   // 注:建议发送事件前检查观察者的isUnsubscribed状态,以便在没有观察者时,让Observable停止发射数据
                    if (!observer.isUnsubscribed()) {
                           emitter.onNext(1);
                           emitter.onNext(2);
                           emitter.onNext(3);
                }
                emitter.onComplete();
            }
        });

// 至此,一个完整的被观察者对象(Observable)就创建完毕了。


但是在使用的时候一般采用链式方式

// 1. 通过creat()创建被观察者对象
        Observable.create(new ObservableOnSubscribe<Integer>() {

            // 2. 在复写的subscribe()里定义需要发送的事件
            @Override
            public void subscribe(ObservableEmitter<Integer> emitter) throws Exception {

                    emitter.onNext(1);
                    emitter.onNext(2);
                    emitter.onNext(3);

                emitter.onComplete();
            }  // 至此,一个被观察者对象(Observable)就创建完毕
        }).subscribe(new Observer<Integer>() {
            // 以下步骤仅为展示一个完整demo,可以忽略
            // 3. 通过通过订阅(subscribe)连接观察者和被观察者
            // 4. 创建观察者 & 定义响应事件的行为
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }
            // 默认最先调用复写的 onSubscribe()

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }

        });
    }


结果

 


just()

快速创建1个被观察者对象(Observable),直接发送 传入的事件

    最多只能传10个参数

具体使用:

// 1. 创建时传入整型1、2、3、4
        // 在创建后就会发送这些对象,相当于执行了onNext(1)、onNext(2)、onNext(3)、onNext(4)
        Observable.just(1, 2, 3,4)   
            // 至此,一个Observable对象创建完毕,以下步骤仅为展示一个完整demo,可以忽略
            // 2. 通过通过订阅(subscribe)连接观察者和被观察者
            // 3. 创建观察者 & 定义响应事件的行为
         .subscribe(new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }
            // 默认最先调用复写的 onSubscribe()

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }

        });
    }


结果:

 


fromArray()

快速创建1个被观察者对象(Observable),直接发送 传入的数组数据

    会将数组中的数据转换为Observable对象

具体使用:

// 1. 设置需要传入的数组
     Integer[] items = { 0, 1, 2, 3, 4 };

        // 2. 创建被观察者对象(Observable)时传入数组
        // 在创建后就会将该数组转换成Observable & 发送该对象中的所有数据
        Observable.fromArray(items) 
        .subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }

        });
    }

// 注:
// 可发送10个以上参数
// 若直接传递一个list集合进去,否则会直接把list当做一个数据元素发送

/*
  * 数组遍历
  **/
        // 1. 设置需要传入的数组
        Integer[] items = { 0, 1, 2, 3, 4 };

        // 2. 创建被观察者对象(Observable)时传入数组
        // 在创建后就会将该数组转换成Observable & 发送该对象中的所有数据
        Observable.fromArray(items)
                .subscribe(new Observer<Integer>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "数组遍历");
                    }

                    @Override
                    public void onNext(Integer value) {
                        Log.d(TAG, "数组中的元素 = "+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "遍历结束");
                    }

                });


结果:

 


 


fromIterable()

快速创建1个被观察者对象(Observable),直接发送 传入的集合List数据

    会将数组中的数据转换为Observable对象

具体实现

/*
 * 快速发送集合
 **/
// 1. 设置一个集合
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(3);

// 2. 通过fromIterable()将集合中的对象 / 数据发送出去
        Observable.fromIterable(list)
                .subscribe(new Observer<Integer>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "开始采用subscribe连接");
                    }

                    @Override
                    public void onNext(Integer value) {
                        Log.d(TAG, "接收到了事件"+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "对Complete事件作出响应");
                    }
                });


/*
 * 集合遍历
 **/
        // 1. 设置一个集合
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(3);

        // 2. 通过fromIterable()将集合中的对象 / 数据发送出去
        Observable.fromIterable(list)
                .subscribe(new Observer<Integer>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "集合遍历");
                    }

                    @Override
                    public void onNext(Integer value) {
                        Log.d(TAG, "集合中的数据元素 = "+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "遍历结束");
                    }
                });


结果:

 


 



    其他

// 下列方法一般用于测试使用

<-- empty()  -->
// 该方法创建的被观察者对象发送事件的特点:仅发送Complete事件,直接通知完成
Observable observable1=Observable.empty(); 
// 即观察者接收后会直接调用onCompleted()

<-- error()  -->
// 该方法创建的被观察者对象发送事件的特点:仅发送Error事件,直接通知异常
// 可自定义异常
Observable observable2=Observable.error(new RuntimeException())
// 即观察者接收后会直接调用onError()

<-- never()  -->
// 该方法创建的被观察者对象发送事件的特点:不发送任何事件
Observable observable3=Observable.never();
// 即观察者接收后什么都不调用

延迟创建

使用场景:
1. 定时操作:在经过了x秒后,需要自动执行y操作
2. 周期性操作:每隔x秒后,需要自动执行y操作
defer()

    作用: 直到有观察者(Observer )订阅时,才动态创建被观察者对象(Observable) & 发送事件

    通过 Observable工厂方法创建被观察者对象(Observable)
    每次订阅后,都会得到一个刚创建的最新的Observable对象,这可以确保Observable对象里的数据是最新的
    具体使用:

<-- 1. 第1次对i赋值 ->>
        Integer i = 10;

        // 2. 通过defer 定义被观察者对象
        // 注:此时被观察者对象还没创建
        Observable<Integer> observable = Observable.defer(new Callable<ObservableSource<? extends Integer>>() {
            @Override
            public ObservableSource<? extends Integer> call() throws Exception {
                return Observable.just(i);
            }
        });

        <-- 2. 第2次对i赋值 ->>
        i = 15;

        <-- 3. 观察者开始订阅 ->>
        // 注:此时,才会调用defer()创建被观察者对象(Observable)
        observable.subscribe(new Observer<Integer>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }

            @Override
            public void onNext(Integer value) {
                Log.d(TAG, "接收到的整数是"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }
        });


结果:
因为是在订阅时才创建,所以i值会取第2次的赋值

 


timer()

    快速创建1个被观察者对象(Observable)
    发送事件的特点:延迟指定时间后,发送1个数值0(Long类型)

    本质 = 延迟指定时间后,调用一次 onNext(0)

具体使用:

// 该例子 = 延迟2s后,发送一个long类型数值
        Observable.timer(2, TimeUnit.SECONDS) 
                  .subscribe(new Observer<Long>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, "开始采用subscribe连接");
            }

            @Override
            public void onNext(Long value) {
                Log.d(TAG, "接收到了事件"+ value  );
            }

            @Override
            public void onError(Throwable e) {
                Log.d(TAG, "对Error事件作出响应");
            }

            @Override
            public void onComplete() {
                Log.d(TAG, "对Complete事件作出响应");
            }

        });

// 注:timer操作符默认运行在一个新线程上
// 也可自定义线程调度器(第3个参数):timer(long,TimeUnit,Scheduler)


结果

 


interval()

    快速创建1个被观察者对象(Observable)
    发送事件的特点:每隔指定时间 就发送 事件

    发送的事件序列 = 从0开始、无限递增1的的整数序列

具体实现

// 参数说明:
        // 参数1 = 第1次延迟时间;
        // 参数2 = 间隔时间数字;
        // 参数3 = 时间单位;
        Observable.interval(3,1,TimeUnit.SECONDS)
                // 该例子发送的事件序列特点:延迟3s后发送事件,每隔1秒产生1个数字(从0开始递增1,无限个)
                .subscribe(new Observer<Long>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "开始采用subscribe连接");
                    }
                    // 默认最先调用复写的 onSubscribe()

                    @Override
                    public void onNext(Long value) {
                        Log.d(TAG, "接收到了事件"+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "对Complete事件作出响应");
                    }

                });

// 注:interval默认在computation调度器上执行
// 也可自定义指定线程调度器(第3个参数):interval(long,TimeUnit,Scheduler)


结果:

 


intervalRange()

    快速创建1个被观察者对象(Observable)
    发送事件的特点:每隔指定时间 就发送 事件,可指定发送的数据的数量

    a. 发送的事件序列 = 从0开始、无限递增1的的整数序列
    b. 作用类似于interval(),但可指定发送的数据的数量

具体实现

// 参数说明:
        // 参数1 = 事件序列起始点;
        // 参数2 = 事件数量;
        // 参数3 = 第1次事件延迟发送时间;
        // 参数4 = 间隔时间数字;
        // 参数5 = 时间单位
        Observable.intervalRange(3,10,2, 1, TimeUnit.SECONDS)
                // 该例子发送的事件序列特点:
                // 1. 从3开始,一共发送10个事件;
                // 2. 第1次延迟2s发送,之后每隔2秒产生1个数字(从0开始递增1,无限个)
                .subscribe(new Observer<Long>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "开始采用subscribe连接");
                    }
                    // 默认最先调用复写的 onSubscribe()

                    @Override
                    public void onNext(Long value) {
                        Log.d(TAG, "接收到了事件"+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "对Complete事件作出响应");
                    }

                });


结果:

 


range()

    快速创建1个被观察者对象(Observable)
    发送事件的特点:连续发送 1个事件序列,可指定范围

    a. 发送的事件序列 = 从0开始、无限递增1的的整数序列
    b. 作用类似于intervalRange(),但区别在于:无延迟发送事件

具体实现:

// 参数说明:
        // 参数1 = 事件序列起始点;
        // 参数2 = 事件数量;
        // 注:若设置为负数,则会抛出异常
        Observable.range(3,10)
                // 该例子发送的事件序列特点:从3开始发送,每次发送事件递增1,一共发送10个事件
                .subscribe(new Observer<Integer>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d(TAG, "开始采用subscribe连接");
                    }
                    // 默认最先调用复写的 onSubscribe()

                    @Override
                    public void onNext(Integer value) {
                        Log.d(TAG, "接收到了事件"+ value  );
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "对Error事件作出响应");
                    }

                    @Override
                    public void onComplete() {
                        Log.d(TAG, "对Complete事件作出响应");
                    }

                });


结果:

 


rangeLong()

    作用:类似于range(),区别在于该方法支持数据类型 = Long
    具体使用与range()类似,此处不作过多描述

最后的总结:

 



一个例子:
1. 添加依赖

// Android 支持 Rxjava
    // 此处一定要注意使用RxJava2的版本
    compile 'io.reactivex.rxjava2:rxjava:2.0.1'
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'

    // Android 支持 Retrofit
    compile 'com.squareup.retrofit2:retrofit:2.1.0'

    // 衔接 Retrofit & RxJava
    // 此处一定要注意使用RxJava2的版本
    compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'

    // 支持Gson解析
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'

    compile 'com.orhanobut:logger:2.1.1'


    创建实体类

package com.paulniu.rxjavademo;

import java.util.List;

/**
 * Created by niupule on 2017/12/30.
 */

public class MovieBean {


    /**
     * count : 20
     * start : 0
     * total : 25
     * subjects : 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& Cie","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1036749/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p4917.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p4917.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p4917.webp"},"name":"阿兰·夏巴","id":"1036749"}],"year":"2017","images":{"small":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2505778884.webp","large":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2505778884.webp","medium":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2505778884.webp"},"alt":"https://movie.douban.com/subject/27011205/","id":"27011205"},{"rating":{"max":10,"average":4.8,"stars":"25","min":0},"genres":["喜剧","犯罪"],"title":"这就是命","casts":[{"alt":"https://movie.douban.com/celebrity/1317139/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371453539.51.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371453539.51.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371453539.51.webp"},"name":"王迅","id":"1317139"},{"alt":"https://movie.douban.com/celebrity/1002862/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1161.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1161.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1161.webp"},"name":"曾志伟","id":"1002862"},{"alt":"https://movie.douban.com/celebrity/1340702/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1402633807.18.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1402633807.18.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1402633807.18.webp"},"name":"梁超","id":"1340702"}],"collect_count":1432,"original_title":"这就是命","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1335838/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1507906324.74.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1507906324.74.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1507906324.74.webp"},"name":"王丹","id":"1335838"}],"year":"2017","images":{"small":"https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2506823369.webp","large":"https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2506823369.webp","medium":"https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2506823369.webp"},"alt":"https://movie.douban.com/subject/27037539/","id":"27037539"},{"rating":{"max":10,"average":6.6,"stars":"35","min":0},"genres":["动作","科幻","奇幻"],"title":"正义联盟","casts":[{"alt":"https://movie.douban.com/celebrity/1054417/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p7622.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p7622.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p7622.webp"},"name":"本·阿弗莱克","id":"1054417"},{"alt":"https://movie.douban.com/celebrity/1044713/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371934661.95.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371934661.95.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1371934661.95.webp"},"name":"亨利·卡维尔","id":"1044713"},{"alt":"https://movie.douban.com/celebrity/1044996/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1467908677.92.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1467908677.92.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1467908677.92.webp"},"name":"盖尔·加朵","id":"1044996"}],"collect_count":121703,"original_title":"Justice League","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1031904/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23346.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23346.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23346.webp"},"name":"扎克·施奈德","id":"1031904"}],"year":"2017","images":{"small":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504027804.webp","large":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504027804.webp","medium":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504027804.webp"},"alt":"https://movie.douban.com/subject/2158490/","id":"2158490"},{"rating":{"max":10,"average":6.2,"stars":"30","min":0},"genres":["惊悚","冒险"],"title":"鲨海","casts":[{"alt":"https://movie.douban.com/celebrity/1000013/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23017.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23017.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p23017.webp"},"name":"曼迪·摩尔","id":"1000013"},{"alt":"https://movie.douban.com/celebrity/1232340/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p46657.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p46657.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p46657.webp"},"name":"克莱尔·霍尔特","id":"1232340"},{"alt":"https://movie.douban.com/celebrity/1050080/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p11804.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p11804.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p11804.webp"},"name":"克里斯·J.约翰逊","id":"1050080"}],"collect_count":11033,"original_title":"47 Meters Down","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1019388/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1498455992.67.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1498455992.67.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1498455992.67.webp"},"name":"约翰内斯·罗伯茨","id":"1019388"}],"year":"2016","images":{"small":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504892832.webp","large":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504892832.webp","medium":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2504892832.webp"},"alt":"https://movie.douban.com/subject/26845362/","id":"26845362"}]
     * title : 正在上映的电影-北京
     */

    private int count;
    private int start;
    private int total;
    private String title;
    private List<SubjectsBean> subjects;

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public int getStart() {
        return start;
    }

    public void setStart(int start) {
        this.start = start;
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public List<SubjectsBean> getSubjects() {
        return subjects;
    }

    public void setSubjects(List<SubjectsBean> subjects) {
        this.subjects = subjects;
    }

    public static class SubjectsBean {
        /**
         * rating : {"max":10,"average":4.9,"stars":"25","min":0}
         * genres : ["喜剧"]
         * title : 妖铃铃
         * casts : [{"alt":"https://movie.douban.com/celebrity/1127819/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp"},"name":"吴君如","id":"1127819"},{"alt":"https://movie.douban.com/celebrity/1325700/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1356510694.28.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1356510694.28.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1356510694.28.webp"},"name":"沈腾","id":"1325700"},{"alt":"https://movie.douban.com/celebrity/1317663/","avatars":{"small":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p40756.webp","large":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p40756.webp","medium":"https://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p40756.webp"},"name":"岳云鹏","id":"1317663"}]
         * collect_count : 10595
         * original_title : 妖铃铃
         * subtype : movie
         * directors : [{"alt":"https://movie.douban.com/celebrity/1127819/","avatars":{"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp"},"name":"吴君如","id":"1127819"}]
         * year : 2017
         * images : {"small":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp","large":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp","medium":"https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp"}
         * alt : https://movie.douban.com/subject/26966580/
         * id : 26966580
         */

        private RatingBean rating;
        private String title;
        private int collect_count;
        private String original_title;
        private String subtype;
        private String year;
        private ImagesBean images;
        private String alt;
        private String id;
        private List<String> genres;
        private List<CastsBean> casts;
        private List<DirectorsBean> directors;

        public RatingBean getRating() {
            return rating;
        }

        public void setRating(RatingBean rating) {
            this.rating = rating;
        }

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public int getCollect_count() {
            return collect_count;
        }

        public void setCollect_count(int collect_count) {
            this.collect_count = collect_count;
        }

        public String getOriginal_title() {
            return original_title;
        }

        public void setOriginal_title(String original_title) {
            this.original_title = original_title;
        }

        public String getSubtype() {
            return subtype;
        }

        public void setSubtype(String subtype) {
            this.subtype = subtype;
        }

        public String getYear() {
            return year;
        }

        public void setYear(String year) {
            this.year = year;
        }

        public ImagesBean getImages() {
            return images;
        }

        public void setImages(ImagesBean images) {
            this.images = images;
        }

        public String getAlt() {
            return alt;
        }

        public void setAlt(String alt) {
            this.alt = alt;
        }

        public String getId() {
            return id;
        }

        public void setId(String id) {
            this.id = id;
        }

        public List<String> getGenres() {
            return genres;
        }

        public void setGenres(List<String> genres) {
            this.genres = genres;
        }

        public List<CastsBean> getCasts() {
            return casts;
        }

        public void setCasts(List<CastsBean> casts) {
            this.casts = casts;
        }

        public List<DirectorsBean> getDirectors() {
            return directors;
        }

        public void setDirectors(List<DirectorsBean> directors) {
            this.directors = directors;
        }

        public static class RatingBean {
            /**
             * max : 10
             * average : 4.9
             * stars : 25
             * min : 0
             */

            private int max;
            private double average;
            private String stars;
            private int min;

            public int getMax() {
                return max;
            }

            public void setMax(int max) {
                this.max = max;
            }

            public double getAverage() {
                return average;
            }

            public void setAverage(double average) {
                this.average = average;
            }

            public String getStars() {
                return stars;
            }

            public void setStars(String stars) {
                this.stars = stars;
            }

            public int getMin() {
                return min;
            }

            public void setMin(int min) {
                this.min = min;
            }
        }

        public static class ImagesBean {
            /**
             * small : https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp
             * large : https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp
             * medium : https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2506825662.webp
             */

            private String small;
            private String large;
            private String medium;

            public String getSmall() {
                return small;
            }

            public void setSmall(String small) {
                this.small = small;
            }

            public String getLarge() {
                return large;
            }

            public void setLarge(String large) {
                this.large = large;
            }

            public String getMedium() {
                return medium;
            }

            public void setMedium(String medium) {
                this.medium = medium;
            }
        }

        public static class CastsBean {
            /**
             * alt : https://movie.douban.com/celebrity/1127819/
             * avatars : {"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp"}
             * name : 吴君如
             * id : 1127819
             */

            private String alt;
            private AvatarsBean avatars;
            private String name;
            private String id;

            public String getAlt() {
                return alt;
            }

            public void setAlt(String alt) {
                this.alt = alt;
            }

            public AvatarsBean getAvatars() {
                return avatars;
            }

            public void setAvatars(AvatarsBean avatars) {
                this.avatars = avatars;
            }

            public String getName() {
                return name;
            }

            public void setName(String name) {
                this.name = name;
            }

            public String getId() {
                return id;
            }

            public void setId(String id) {
                this.id = id;
            }

            public static class AvatarsBean {
                /**
                 * small : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 * large : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 * medium : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 */

                private String small;
                private String large;
                private String medium;

                public String getSmall() {
                    return small;
                }

                public void setSmall(String small) {
                    this.small = small;
                }

                public String getLarge() {
                    return large;
                }

                public void setLarge(String large) {
                    this.large = large;
                }

                public String getMedium() {
                    return medium;
                }

                public void setMedium(String medium) {
                    this.medium = medium;
                }
            }
        }

        public static class DirectorsBean {
            /**
             * alt : https://movie.douban.com/celebrity/1127819/
             * avatars : {"small":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","large":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp","medium":"https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp"}
             * name : 吴君如
             * id : 1127819
             */

            private String alt;
            private AvatarsBeanX avatars;
            private String name;
            private String id;

            public String getAlt() {
                return alt;
            }

            public void setAlt(String alt) {
                this.alt = alt;
            }

            public AvatarsBeanX getAvatars() {
                return avatars;
            }

            public void setAvatars(AvatarsBeanX avatars) {
                this.avatars = avatars;
            }

            public String getName() {
                return name;
            }

            public void setName(String name) {
                this.name = name;
            }

            public String getId() {
                return id;
            }

            public void setId(String id) {
                this.id = id;
            }

            public static class AvatarsBeanX {
                /**
                 * small : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 * large : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 * medium : https://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p45539.webp
                 */

                private String small;
                private String large;
                private String medium;

                public String getSmall() {
                    return small;
                }

                public void setSmall(String small) {
                    this.small = small;
                }

                public String getLarge() {
                    return large;
                }

                public void setLarge(String large) {
                    this.large = large;
                }

                public String getMedium() {
                    return medium;
                }

                public void setMedium(String medium) {
                    this.medium = medium;
                }
            }
        }
    }
}


使用的是豆瓣电影API,直接用Gsonformat,内容比较多
3. 创建描述网络请求的接口

package com.paulniu.rxjavademo;

import io.reactivex.Observable;
import retrofit2.http.GET;

/**
 * Created by niupule on 2017/12/30.
 */

public interface GerRequest_Interface {

    @GET("v2/movie/in_theaters")
    Observable<MovieBean> getCall();
    // 注解里传入 网络请求 的部分URL地址
    // Retrofit把网络请求的URL分成了两部分:一部分放在Retrofit对象里,另一部分放在网络请求接口里
    // 如果接口里的url是一个完整的网址,那么放在Retrofit对象里的URL可以忽略
    // 采用Observable<...>接口
    // getCall()是接受网络请求数据的方法

}


    在Activity中实现

package com.paulniu.rxjavademo;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.ListView;

import com.jakewharton.retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import com.orhanobut.logger.AndroidLogAdapter;
import com.orhanobut.logger.Logger;


import io.reactivex.Observable;
import io.reactivex.ObservableEmitter;
import io.reactivex.ObservableOnSubscribe;
import io.reactivex.Observer;
import io.reactivex.Scheduler;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.Disposable;
import io.reactivex.functions.Consumer;
import io.reactivex.schedulers.Schedulers;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * Created by niupule on 2017/12/30.
 */

public class RxJava_Douban extends Activity {

    private ListView listview;

    public static final String TAG = "RxJava_Douban";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rxjava_douban);
        listview = findViewById(R.id.listview);
        Logger.addLogAdapter(new AndroidLogAdapter());
        getData();
    }

    private void getData() {
        /**
         * 通过RxJava发送网络请求
         */
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("https://api.douban.com/")
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build();

        GerRequest_Interface request = retrofit.create(GerRequest_Interface.class);
        Observable<MovieBean> call = request.getCall();
        call.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<MovieBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(MovieBean value) {
                        //获取服务器返回数据
                        Logger.d("hello");
                        Logger.d(value.getSubjects().size());
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }
}


暂时先写这么多,后面关于别的内容,以后再补充

代码实例
参考资料

轻易&易懂的RxJava入门
RxJava基础操作符-创建操作符
给初学者的RxJava教程
功能强大的Logger
[RxJava中文文档]
(https://mcxiaoke.gitbooks.io/rxdocs/content/)

 

posted @ 2019-01-25 14:41  brave-sailor  阅读(563)  评论(0编辑  收藏  举报