AdpOnBoarding.kt

class AdpOnBoarding(fm: FragmentManager, behavior: Int) : FragmentPagerAdapter(fm, behavior) {
    private val fragments = mutableListOf<Fragment>()

    fun addItem(fragment: Fragment) {
        fragments.add(fragment)
        notifyDataSetChanged()
    }

    override fun getItem(position: Int): Fragment = fragments[position]

    override fun getCount(): Int = fragments.size
}