ViewPager2 and FragmentStatePagerAdapter

Question

I want to set the adapter of ViewPager2 to FragmentStatePagerAdapter but I get this error:

Type mismatch. Required: (RecyclerView.Adapter<RecyclerView.ViewHolder!>?..RecyclerView.Adapter<*>?) Found: ViewPager2Adapter

My ViewPagerAdapter class is

class ViewPager2Adapter(fm:FragmentManager) :FragmentStatePagerAdapter(fm) {

override fun getItem(position: Int): Fragment {
    return when(position) {
        0 -> {
            MyScansListFragment()
        }
        1 -> {
            PurchasedItemsFragment()
        }
        else -> {
            Fragment()
        }
    }
}

override fun getCount(): Int {
    return 2
}

override fun getItemPosition(`object`: Any): Int {
    return POSITION_NONE
}}

And in the oncreateView() :

val viewPager2Adapter = ViewPager2Adapter(activity?.supportFragmentManager!!)
    binding!!.viewPager.adapter = viewPager2Adapter

lets start coding · Answer 1 · 2021-07-28T16:04:25.743

2

okay, let's change the code a little bit. First of all, FragmentStatePagerAdapter has been deprecated.

FragmentStatePagerAdapter & FragmentPagerAdapter have been recently deprecated, and your code must look something like this. ~~FragmentStatePagerAdapter~~ and if you get your cursor over it and see details, there will be a statement "Deprecated Switch to androidx.viewpager2.widget.ViewPager2 and use androidx.viewpager2.adapter.FragmentStateAdapter instead."

try the following code.

class ViewPager2Adapter(private val listFragment: ArrayList<Fragment>,
                        fm: FragmentManager,
                        lifecycle: Lifecycle) : FragmentStateAdapter(fm, lifecycle) {


    override fun getItemCount(): Int {
        return listFragment.size
    }

    override fun createFragment(position: Int): Fragment {
       return listFragment[position]
    }
}

so, this is now kind of your universal viewpager adapter. The next thing is we require fragments to be passed in here.

//I don't think you need Fragment() but since it's there in your list.

val fragmentList = listOf(MyScansListFragment(),  PurchasedItemsFragment(),Fragment())
val viewPager2Adapter = ViewPager2Adapter(fragmentList, activity?.supportFragmentManager!!, lifecycle)
binding!!.viewPager.adapter = viewPager2Adapter

edited Jul 28 '21 at 16:04

answered Jul 28 '21 at 12:22

lets start coding

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Thanks for the answer, but since my fragments doesn't update when data is changed I wanted to use FragmentStatePagerAdapter because of the answer in there https://stackoverflow.com/questions/30080045/fragmentpageradapter-notifydatasetchanged-not-working – Abdulsamet Kılınçarslan Jul 28 '21 at 12:24
so, that's an old question and FragmentStatePagerAdapter has been recently deprecated, even you must see your code look something like this. ~~FragmentStatePagerAdapter~~ and if you get your cursor over it and see details, there will be a statement " Deprecated Switch to androidx.viewpager2.widget.ViewPager2 and use androidx.viewpager2.adapter.FragmentStateAdapter instead." – lets start coding Jul 28 '21 at 12:34
even FragmentPagerAdapter has been deprecated for that as well android studio tells you to switch to FragmentStateAdapter. – lets start coding Jul 28 '21 at 12:35
@AbdulsametKılınçarslan if this answer helped you out don't forget to mark this answer as accepted and feel free to ask queries if you have any. – lets start coding Jul 28 '21 at 16:12

ViewPager2 and FragmentStatePagerAdapter

1 Answers1