I have created RecyclerView in fragment inside activity, all are working good but when i do notifyDataSetChanged() to adapter from activity through interface,I got an error "lateinit property adapter has not been initialized" but I have already initialized adapter
class BuildingListFragment : Fragment(), MainActivity.EditInterface {
lateinit var adapter: BuildingListAdapter
private var mListener: OnFragmentInteractionListener? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
return inflater!!.inflate(R.layout.fragment_building_list, container, false)
}
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
val buildingList = ArrayList<BuildingDetailModel>()
val alphaList = arrayOf("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K",
"L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "z")
for (i in alphaList.indices) {
val building = BuildingDetailModel()
building.buildingName = alphaList[i] + " Building"
buildingList.add(building)
}
//initialize adapter
adapter = BuildingListAdapter(buildingList)
// RV_Building_List.layoutManager = LinearLayoutManager(context, LinearLayout.VERTICAL, false)
RV_Building_List.adapter = adapter
RV_Building_List.layoutManager = object : LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false) {
override fun onLayoutChildren(recycler: RecyclerView.Recycler?, state: RecyclerView.State) {
super.onLayoutChildren(recycler, state)
//TODO if the items are filtered, considered hiding the fast scroller here
val firstVisibleItemPosition = findFirstVisibleItemPosition()
if (firstVisibleItemPosition != 0) {
// this avoids trying to handle un-needed calls
if (firstVisibleItemPosition == -1)
//not initialized, or no items shown, so hide fast-scroller
{
fastscroller.visibility = View.GONE
}
return
}
val lastVisibleItemPosition = findLastVisibleItemPosition()
val itemsShown = lastVisibleItemPosition - firstVisibleItemPosition + 1
//if all items are shown, hide the fast-scroller
fastscroller.visibility = if (adapter.itemCount > itemsShown) View.VISIBLE else View.GONE
}
}
fastscroller.setRecyclerView(RV_Building_List)
fastscroller.setViewsToUse(R.layout.recycler_view_fast_scroller__fast_scroller, R.id.fastscroller_bubble, R.id.fastscroller_handle)
}
override fun editClickFromMainActivity() {
// TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
//at this line error is lateinit property adapter has not been initialized
if (adapter.getIsSelected()) adapter.setIsSelected(false) else adapter.setIsSelected(true)
}
override fun onDetach() {
super.onDetach()
mListener = null
}
override fun onResume() {
super.onResume()
}
interface OnFragmentInteractionListener {
// TODO: Update argument type and name
fun onFragmentInteraction(uri: Uri)
}
companion object {
// TODO: Rename and change types and number of parameters
fun newInstance(): BuildingListFragment {
val fragment = BuildingListFragment()
return fragment
}
}
}
My mainActivity
class MainActivity : AppCompatActivity() {
private val mOnNavigationItemSelectedListener =
BottomNavigationView.OnNavigationItemSelectedListener { item ->
when (item.itemId) {
R.id.navigation_list -> {
val fragment = BuildingListFragment.Companion.newInstance();
addFragment(fragment, R.anim.slide_re_in, R.anim.slide_re_out)
return@OnNavigationItemSelectedListener true
}
R.id.navigation_map -> {
val fragment = BuildingMapFragment.Companion.newInstance();
addFragment(fragment, R.anim.slide_in, R.anim.slide_out)
return@OnNavigationItemSelectedListener true
}
}
false
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)
val fragment = BuildingListFragment.Companion.newInstance()
addFragment(fragment, R.anim.slide_re_in, R.anim.slide_re_out)
iv_Add.setOnClickListener {
var intent = Intent(this, AddBuildingMapsActivity::class.java)
startActivity(intent)
}
iv_edit.setOnClickListener {
(BuildingListFragment.newInstance() as EditInterface).editClickFromMainActivity()
}
}
/**
* add/replace fragment in container [framelayout]
*/
private fun addFragment(fragment: Fragment, slide_re_in: Int, slide_re_out: Int) {
supportFragmentManager
.beginTransaction()
.setCustomAnimations(slide_re_in, slide_re_out)
.replace(R.id.fragmentContainer, fragment, null)//fragment.javaClass.getSimpleName()
.addToBackStack(null)//fragment.javaClass.getSimpleName()
.commit()
}
override fun onBackPressed() {
super.onBackPressed()
Log.e("TAG", "TAG")
}
interface EditInterface {
fun editClickFromMainActivity()
}
}
please help me to solve this issue thanks..
