FragmentPagerAdapterSample.kt

class FragmentPagerAdapterSample(manager: FragmentManager) : FragmentPagerAdapter(manager) {

    private val data = ArrayList<Any>()

    fun setData(data: List<Any>) {
        this.data.clear()
        this.data.addAll(data)
        notifyDataSetChanged()
    }

    override fun getItem(position: Int) = when (data[position]) {
        is Question -> QuestionFragment.newInstance(data[position] as Question)
        is Answer -> AnswerFragment.newInstance(data[position] as Answer)
        else -> null
    }

    override fun getCount() = data.size

    override fun getPageTitle(position: Int) = data[position].toString()

}