RxJava实战演示1------基本代码使用

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声明：本文适合有一点RxJava语法基础的同学阅读，如果基础为零，建议先看下仍物线大神的此篇文章：http://gank.io/post/560e15be2dca930e00da1083

1.应用程序配置，如果使用java8的lambda表达式的话，需要额外添加如下配置

在全局build.gradle的 dependencies中添加：classpath 'me.tatarka:gradle-retrolambda:2.5.0'

在app的build.gradle中添加如下内容：apply plugin: 'me.tatarka.retrolambda'，android空间下添加

compileOptions {        sourceCompatibility JavaVersion.VERSION_1_8        targetCompatibility JavaVersion.VERSION_1_8    }

正常的Rxjava配置，在dependencies中添加

 compile 'io.reactivex:rxjava:1.1.0' compile 'io.reactivex:rxandroid:1.1.0'

本文将添加，以下配置

compile fileTree(dir: 'libs', include: ['*.jar'])    testCompile 'junit:junit:4.12'    compile 'com.android.support:appcompat-v7:21.0.3'    compile 'com.android.support:cardview-v7:21.0.3'    compile 'com.android.support:recyclerview-v7:21.0.3'    compile 'io.reactivex:rxjava:1.1.0'    compile 'io.reactivex:rxandroid:1.1.0'    compile 'com.google.code.gson:gson:2.4'    compile 'com.jakewharton:butterknife:7.0.1'    compile 'com.squareup.picasso:picasso:2.5.2'    compile 'com.squareup.okhttp3:okhttp:3.+'

2.实例演示，基本用法

 /**     * 使用create方式     */    public static void createObserable() {        //定义被观察者，        Observable<String> observable = Observable.create(new Observable.OnSubscribe<String>() {            @Override            public void call(Subscriber<? super String> subscriber) {                if (!subscriber.isUnsubscribed()) {                    subscriber.onNext("hello");                    subscriber.onNext("hi");                    subscriber.onNext(downLoadJson());                    subscriber.onNext("world");                    subscriber.onCompleted();                }            }        });        Subscriber<String> showsub = new Subscriber<String>() {            @Override            public void onCompleted() {                Log.i(TAG, "onCompleted");            }            @Override            public void onError(Throwable e) {                Log.i(TAG, e.getMessage());            }            @Override            public void onNext(String s) {                Log.i(TAG, "result-->>" + s);            }        };        observable.subscribe(showsub);//关联被观察者    }    /**     * 调用下载方法     *     * @return     */    public static String downLoadJson() {        return "json data";    }    /**     * create 第二种方式     */    public static void createPrint() {        Observable.create(new Observable.OnSubscribe<Integer>() {            @Override            public void call(Subscriber<? super Integer> subscriber) {                if (!subscriber.isUnsubscribed()) {                    for (int i = 1; i <= 10; i++) {                        subscriber.onNext(i);                    }                    subscriber.onCompleted();                }            }        }).subscribe(new Subscriber<Integer>() {            @Override            public void onCompleted() {                Log.i(TAG, "onCompleted");            }            @Override            public void onError(Throwable e) {                Log.i(TAG, e.getMessage());            }            @Override            public void onNext(Integer integer) {                Log.i(TAG, "result-->>" + integer);            }        });    }    /***     * 使用在被观察者，返回的对象一般都是数值类型     */    public static void from() {        Integer[] items = {1, 2, 3, 4, 5, 6, 7, 8, 9};        Observable observable = Observable.from(items);        observable.subscribe(new Action1() {            @Override            public void call(Object o) {                Log.i(TAG, o.toString());            }        });    }    /**     * 指定某一时刻进行数据发送，轮询发射，注意与timer的区别     */    public static void interval() {        Integer[] items = {1, 2, 3, 4, 5};        Observable observable = Observable.interval(1, 1, TimeUnit.SECONDS);//每过一秒发送1个数据        observable.subscribe(new Action1() {            @Override            public void call(Object o) {                Log.i(TAG, o.toString());            }        });    }    /**     * 处理数组集合，将会按顺序输出1,2,3,4,5,6,3,5......     */    public static void just() {        Integer[] items1 = {1, 2, 3, 4, 5, 6};        Integer[] items2 = {3, 5, 6, 8, 3, 8};        Observable observable = Observable.just(items1, items2);        observable.subscribe(new Subscriber<Integer[]>() {            @Override            public void onCompleted() {                Log.i(TAG, "onCompleted");            }            @Override            public void onError(Throwable e) {                Log.i(TAG, e.getMessage());            }            @Override            public void onNext(Integer[] o) {                for(int i=0;i<o.length;i++){                    Log.i(TAG,"next:"+o[i]);                }            }        });    } //Observable.just(items1, items2).repeat(3).subscribe() 重复进行3次发射

<pre name="code" class="java">/** * 使用范围数据，指定输出数据的范围 */

public static void range(){

Observable observable = Observable.range(1, 40);//第一个是起始点，第二个是想发射数字的个数

observable.subscribe(new Subscriber<Integer>()

{ @Override

public void onCompleted()

{ Log.i(TAG, "onCompleted");

@Override

 public void onError(Throwable e)

{ Log.i(TAG, e.getMessage()); }

 @Override

 public void onNext(Integer o)

{ Log.i(TAG,"next:"+o); }

});

 /** * 使用过滤功能,将只会输出1,2,3,4 */

public static void filter(){

Observable observable = Observable.just(1,2,3,4,5,7,8);

observable.filter(new Func1<Integer,Boolean>()

{ @Override

public Boolean call(Integer o)

{ return o<5; } }).observeOn(Schedulers.io()).subscribe(new Subscriber<Integer>() {

@Override public void onCompleted() { }

 @Override public void onError(Throwable e) { }

@Override public void onNext(Integer o)

{ Log.i(TAG,o.toString()); }

});

Observable.timer(3,TimeUnit.SECONDS)//3秒后再进行发射.subscribe(new Observable<Long>() {@Overridepublic void onCompleted() {}@Overridepublic void onError(Throwable e) {}@Overridepublic void onNext(Long number) {Log.d("RXJAVA", "I say " + number);}});

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