RxJava & RxAndroid简单使用（1）

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介绍

RxJava 的官方介绍：RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
RxAndroid的官方介绍：RxJava bindings for Android.

一般都结合Observable一起使用还有Retrofit，下面我就记录点简单的使用。RxJava的精妙之处就是Schedulers的使用。

添加依赖dependencies

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

just的简单使用

观察者输出整型1、2、3

        Observable.just(1,2,3)
                .subscribe(new Observer<Integer>() {

                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d("onSubscribe","Subscribe");
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d("onError",e.toString());
                    }

                    @Override
                    public void onNext(Integer integer) {
                       Log.d("onNext",integer+"");
                    }

                    @Override
                    public void onComplete() {
                        Log.d("onComplete","Complete");
                    }
                });

输出结果：

04-10 04:12:01.421 14730-14730/com.song.rxjavademo D/onSubscribe: Subscribe
04-10 04:12:01.421 14730-14730/com.song.rxjavademo D/onNext: 1
04-10 04:12:01.421 14730-14730/com.song.rxjavademo D/onNext: 2
04-10 04:12:01.421 14730-14730/com.song.rxjavademo D/onNext: 3
04-10 04:12:01.421 14730-14730/com.song.rxjavademo D/onComplete: Complete

观察者输出字符串”string1”、”string2”、”string3”

        Observable.just("string1","string2","string3")
        .subscribe(new Observer<String>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d("onNext","onSubscribe");
            }

            @Override
            public void onNext(String value) {
                Log.d("onNext",value);
            }

            @Override
            public void onError(Throwable e) {
                Log.d("onError",e.toString());
            }

            @Override
            public void onComplete() {
                Log.d("onError","onComplete");
            }
        });

输出结果：

04-10 04:09:15.889 12236-12236/com.song.rxjavademo D/onNext: onSubscribe
04-10 04:09:15.889 12236-12236/com.song.rxjavademo D/onNext: string1
04-10 04:09:15.889 12236-12236/com.song.rxjavademo D/onNext: string2
04-10 04:09:15.889 12236-12236/com.song.rxjavademo D/onNext: string3
04-10 04:09:15.889 12236-12236/com.song.rxjavademo D/onError: onComplete

fromArray的使用

输出整型1、2、3

        Integer[] items = {1,2,3};

        Observable.fromArray(items).subscribe(new Observer<Integer>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d("onSubscribe","onSubscribe");
            }

            @Override
            public void onNext(Integer value) {
                Log.d("onNext",""+value);
            }

            @Override
            public void onError(Throwable e) {
                Log.d("onError","onError");
            }

            @Override
            public void onComplete() {
                Log.d("onComplete","onComplete");
            }
        });

输出结果：

04-10 04:24:12.937 25593-25593/com.song.rxjavademo D/onSubscribe: onSubscribe
04-10 04:24:12.937 25593-25593/com.song.rxjavademo D/onNext: 1
04-10 04:24:12.937 25593-25593/com.song.rxjavademo D/onNext: 2
04-10 04:24:12.937 25593-25593/com.song.rxjavademo D/onNext: 3
04-10 04:24:12.937 25593-25593/com.song.rxjavademo D/onComplete: onComplete

repeat的简单使用

repeat（重复的次数）
简单循环三次，传进参数3，例如：repeat（3）

        String[] items = {"string1","string2","string3"};
        Observable.fromArray(items).repeat(3).subscribe(new Observer<String>() {
            @Override
            public void onSubscribe(Disposable d) {
                Log.d("onSubscribe","onSubscribe");
            }

            @Override
            public void onNext(String value) {
                Log.d("onNext",""+value);
            }

            @Override
            public void onError(Throwable e) {
                Log.d("onError","onError");
            }

            @Override
            public void onComplete() {
                Log.d("onComplete","onComplete");
            }
        });

输出结果：

04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onSubscribe: onSubscribe
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string1
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string2
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string3
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string1
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string2
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string3
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string1
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string2
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onNext: string3
04-10 04:30:59.037 31616-31616/com.song.rxjavademo D/onComplete: onComplete

repeatWhen的简单使用

repeatWhen(Function) 传一个Function 每隔3秒钟执行一次

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        String[] items = {"string1", "string2", "string3"};
        Observable.fromArray(items)
                .repeatWhen(new Function<Observable<Object>, ObservableSource<?>>() {
                    @Override
                    public ObservableSource<?> apply(Observable<Object> objectObservable) throws Exception {
                        return objectObservable.delay(3, TimeUnit.SECONDS);
                    }
                })
                .subscribe(new Observer<String>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        Log.d("onSubscribe", "onSubscribe");
                    }

                    @Override
                    public void onNext(String value) {
                        Log.d("onNext", "" + value);
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d("onError", "onError");
                    }

                    @Override
                    public void onComplete() {
                        Log.d("onComplete", "onComplete");
                    }
                });

输出结果：

04-10 05:00:07.709 14217-14217/com.song.rxjavademo D/onSubscribe: onSubscribe
04-10 05:00:07.713 14217-14217/com.song.rxjavademo D/onNext: string1
04-10 05:00:07.713 14217-14217/com.song.rxjavademo D/onNext: string2
04-10 05:00:07.713 14217-14217/com.song.rxjavademo D/onNext: string3
04-10 05:00:10.717 14217-14251/com.song.rxjavademo D/onNext: string1
04-10 05:00:10.717 14217-14251/com.song.rxjavademo D/onNext: string2
04-10 05:00:10.717 14217-14251/com.song.rxjavademo D/onNext: string3
......

参考

• https://juejin.im/entry/582a5664da2f600063c90438
• http://blog.csdn.net/nicolelili1/article/details/52038211
• http://blog.csdn.net/pizza_lawson/article/details/45198117
• http://www.jianshu.com/p/5e93c9101dc5