android kotlin之rxjava2

首先在build.gradle中增加

 implementation 'io.reactivex.rxjava2:rxjava:2.1.4'
 implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'

Observable幾種創建方法

        //使用Observable.just()創建被觀察者
        var observable2 = Observable.just("Hello", "World");
        //使用Observable.from()創建被觀察者

        val words: IntArray = intArrayOf(1, 2, 3)
        var observable3 = Observable.fromArray(words);

        var list =  ArrayList<String>();
        list.add("Hellow");
        list.add("Wrold");
        var observable4 = Observable.fromArray(list);

簡單的示例

 Observable.create(ObservableOnSubscribe<Int?> { emitter ->
            emitter.onNext(1)
            emitter.onNext(2)
            emitter.onNext(3)
            emitter.onNext(4)
            emitter.onComplete()
        }).subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(object : Observer<Int?> {
                    override fun onSubscribe(d: Disposable) {
                        println("onSubscribe=$d")
                    }

                    override fun onNext(t: Int) {
                        println("onNext=$t")
                    }

                    override fun onError(e: Throwable) {
                        println("onError=$e")
                    }

                    override fun onComplete() {
                        println("onComplete")
                    }
                })

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