lateinit var disposable : Disposable
// 第一个参数提供了一个集合资源
Observable.using({ listOf(1,2,3,4,5,6,7,8) },...) { disposable = d}
override fun onNext(t: Int) {
Log.e("RX", "onNext $t...")
if (t == 5) disposable?....super T> onNext)
public final Disposable subscribe(Consumer onNext, Consumer onSubscribe)
public final void subscribe(Observer<?