//fragment
private var notices = listOf<String>()

override fun onActivityCreated(savedInstanceState: Bundle?) {

        viewModel = obtainViewModel(FindingOpponentViewModel::class.java).apply {
            observe(changeSlide, {
                if (vpGuide.currentItem == notices.size - 1) {
                    vpGuide.currentItem = 0
                } else {
                    vpGuide.currentItem = vpGuide.currentItem + 1
                }
            })

            startChangeSlideEvent()
        }

    //...
    vpGuide.apply {
        adapter = NoticePagerAdapter(notices)
        offscreenPageLimit = notices.size - 1
        addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
            override fun onPageScrollStateChanged(p0: Int) {
            }

            override fun onPageScrolled(p0: Int, p1: Float, p2: Int) {
            }

            override fun onPageSelected(p0: Int) {
                viewModel.startChangeSlideEvent()
            }
        })
    }
}

// viewModel
val changeSlide = SingleLiveData<Boolean>()

var eventDisposable: Disposable? = null

fun startChangeSlideEvent() {
        eventDisposable?.dispose()

        eventDisposable = Flowable.intervalRange(0, 1, 3, 3, TimeUnit.SECONDS)
                .waitOnUI()
                .subscribe(
                        { changeSlide.postValue(true) },
                        { Timber.e(it) }
                )

        addDisposable(eventDisposable)
    }