BottomBarAdapter

class BottomBarAdapter : NavBarFragmentStatePagerAdapter<Fragment> {

    private val fragments = ArrayList<Fragment>()

    constructor(fm: FragmentManager?) : super(fm)

    fun addFragments(fragment: Fragment) {
        fragments.add(fragment)
    }

    override fun getItem(position: Int): Fragment {
        return fragments.get(position);
    }

    override fun getCount(): Int {
        return fragments.size;
    }
}

CategorySearchFragment

class CategorySearchFragment : Fragment() {

    @BindView(R.id.rvSearchList)
    lateinit var rvSearchList: RecyclerView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        val view = inflater.inflate(R.layout.fragment_search_category, container, false)
        ButterKnife.bind(this, view)
        initAdapter()
        return view
    }

    override fun onResume() {
        super.onResume()
        initAdapter()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        rvSearchList.clearOnChildAttachStateChangeListeners()
        rvSearchList.layoutManager = null
        rvSearchList.adapter = null
    }

    private fun initAdapter() {
        val adapter = SeachListAdapter(this.context, getData())
        val llManager = LinearLayoutManager(this.context)
        rvSearchList.layoutManager = llManager
        rvSearchList.adapter = adapter
    }

    private val data = arrayListOf<Organization>()

    fun getData(): ArrayList<Organization> {
        for (i in 0..orgs.size - 1) {
            data.add(Organization(orgs[i], location[i], distance[i], openClosed[i]))
        }
        return data
    }

    private val openClosed = booleanArrayOf(true, false, true, false, true, false, true, false)
    private val orgs = arrayOf("Organization One", "Organization Two",
            "Organization Three", "Organization Four", "Organization Five",
            "Organization Six", "Organization Seven", "Organization Eight")
    private val location = arrayOf("Tashkent, Uzbekistan", "Shymkent, Kazakhstan",
            "Tashkent, Uzbekistan", "Tashkent, Uzbekistan",
            "Samarkand, Uzbekistan", "Fergana, Uzbekistan",
            "Namangan, Uzbekistan", "Tashkent, Uzbekistan")
    private val distance = floatArrayOf(1f, 2f, 3f, 4f, 5f, 6f, 7f, 8f)
}

HomeActivity

private lateinit var pagerAdapter: BottomBarAdapter

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.content_main)
        setupViewPager()
    }

private fun setupViewPager() {
        viewPager.setPagingEnabled(false);
        pagerAdapter = BottomBarAdapter(getSupportFragmentManager())

        pagerAdapter.addFragments(HomeFragment.newInstance());
        pagerAdapter.addFragments(SearchFragment.newInstance());
        pagerAdapter.addFragments(BookmarkFragment.newInstance());
        pagerAdapter.addFragments(MyProfileFragment.newInstance());

        viewPager.setAdapter(pagerAdapter);
    }

SearchFragment

class SearchFragment : Fragment() {

    @BindView(R.id.vpSearch)
    lateinit var vpSearch: ViewPager
    @BindView(R.id.tlSearch)
    lateinit var tlSearch: TabLayout
    @BindView(R.id.llWorkingContainer)
    lateinit var llWorkingContainer: RelativeLayout
    @BindView(R.id.llGradContainer)
    lateinit var llGradContainer: LinearLayout

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {

        val view = inflater.inflate(R.layout.fragment_search, container, false) as View
        ButterKnife.bind(this, view)
        val adapter = SearchVPAdapter(fragmentManager)

        adapter.addFragment(CategorySearchFragment(), "Category")
        adapter.addFragment(NameSearchFragment(), "Name")
        adapter.addFragment(MapSearchFragment(), "Map")
        vpSearch.adapter = adapter
        tlSearch.setupWithViewPager(vpSearch)
        initUI()
        return view
    }

    private fun initUI() {
        RevelyGradient.linear()
                .angle(-45f)
                .colors(Constants.arrOfColsBelowToolbar)
                .onBackgroundOf(llGradContainer)
    }


    override fun onDetach() {
        super.onDetach()
    }

    override fun onDestroyView() {
        super.onDestroyView()
//        rvSearchList.clearOnChildAttachStateChangeListeners()
//        rvSearchList.layoutManager = null
//        rvSearchList.adapter = null
    }

    companion object {
        @JvmStatic
        fun newInstance()  = SearchFragment()
    }
}