How to get Current Fragment in ViewPager2

Question

i used this ViewPager2 dependency:

implementation 'androidx.viewpager2:viewpager2:1.0.0'

then i wrote code and make Adapter for FragmentStateAdapter like below:

private inner class ViewPagerAdapter(fragmentManager: FragmentManager,
                                         lifecycle: Lifecycle, config: TribunConfig?)
        : FragmentStateAdapter(fragmentManager, lifecycle) {
        private val config: TribunConfig?
        override fun createFragment(position: Int): Fragment {
            return TribunNewsFragment.newInstance(if (menuTribun!!.get(position) == "News") "home"
            else menuTribun!!.get(position)!!.replace(" ", "").toLowerCase(), config)!!
        }

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

        init {
            this.config = config
        }
    }

an in method onCreate i implement some code related viewpager2 and its adapter like below:

        viewPager2!!.offscreenPageLimit = 1
        viewPager2!!.adapter = ViewPagerAdapter(supportFragmentManager, lifecycle, config)
        TabLayoutMediator(tabLayout!!, viewPager2!!, TabLayoutMediator.TabConfigurationStrategy { tab: TabLayout.Tab?, position: Int -> tab!!.text = menuTribun!!.get(position) }).attach()

But i have problem when i want to make swipeRefresh. My swipeRefresh needs current fragment to access the method inside fragment. But there is NO METHOD getItem in FragmentStateAdapter. Anyone can help me?

Answer 1

1. Create property in your adapter to save all your fragments
2. Save current position
3. Get fragment from fragment list (property) by position when you need it

Something like this:

    val fragments: MutableList<Fragment> = mutableListOf()

    private val config: TribunConfig?
    override fun createFragment(position: Int): Fragment {
        val fragment = TribunNewsFragment.newInstance(if (menuTribun!!.get(position) == "News") "home"
        else menuTribun!!.get(position)!!.replace(" ", "").toLowerCase(), config)!!

        fragments.add(fragment)
        return fragment
    }

Parent:

 yourTabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
        override fun onTabSelected(tab: TabLayout.Tab?) {
            val fragment = adapter.fragments[tab!!.position]
            // cast fragment to your fragment class and do what you want
        }

        override fun onTabUnselected(tab: TabLayout.Tab?) {
        }

        override fun onTabReselected(tab: TabLayout.Tab?) {
        }
    })

Also you can use when or if-else for your fragments position or create base class with methods you need and cast getting fragment to it.