Question

使用 LiveDataReactiveStreams 可以将LiveData转换为Publisher。但是为了使用 RxJava2 方法，例如withLatestFrom，我需要Observable而不是Publisher。是否有另一种方法将Publisher转换为Observable，旁边使用这个（过时的）库 - RxJava<->ReactiveStreams？

Answer 1

// Flowable to LiveData

val flowable = Flowable.just(1, 2, 3)
val liveData = LiveDataReactiveStreams.fromPublisher<Int>(flowable)

// From Live Data to Publisher(Flowable is also publisher)

LiveDataReactiveStreams.toPublisher(this, liveData).subscribe(object: Subscriber<Int>{
    override fun onNext(t: Int?) {}

    override fun onComplete() {}

    override fun onSubscribe(s: Subscription?) {}

    override fun onError(t: Throwable?) {}
})

Answer 2

所以我设法做了这样的事情。但我不知道将此代码放在android项目结构中的位置，因为toPublisher需要Activity实例。

val rxDataPublisher: Publisher<DataSnapshot> = LiveDataReactiveStreams.toPublisher(this@LocationActivity,fireBaseLiveData)

val rxLocationPublisher: Publisher<Location> = LiveDataReactiveStreams.toPublisher(this@LocationActivity, locationLiveData)

val rxFlowable: Flowable<Pair<Location, DataSnapshot>> = Flowable.fromPublisher(rxDataPublisher)
                .withLatestFrom(rxLocationPublisher, BiFunction{t1, t2 -> Pair(t2,t1) })

val flowableToLiveData = LiveDataReactiveStreams.fromPublisher(rxFlowable)

LiveData to Observable转换为使用RxJava

2 个答案: