Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview..)' on a null object reference

Issue

I want to write a good chat application with bottom navigation using Fragments. In ChatsFragment.kt I got a problem: enter image description here

My fun onCreateView() in ChatsFragment:

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

    usersRecycler.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)

    var userlist = ArrayList<User>()
    userlist.add(User("Squirrel", "https://wampi.ru/image/RjQ3yNw"))
    userlist.add(User("Adam", "https://wampi.ru/image/RjQ3yNw"))


    var userAdapter = UserAdapter(requireActivity(), userlist)
    usersRecycler.adapter = userAdapter
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_chats, container, false)

}

Exception on usersRecycler.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)

I read a lot of solutions like: "replace "this" to requiredActivity() or requiredContext()", but nothing helped, throwing out this error: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference

I also wanted replace Fragments on Activity as bottom navigation. Would that be the wrong decision?

How can I resolve this problem? Help me, android developers, please...

Solution

To solve this issue you need to pass the context of fragment. in Kotlin below code can solve your problem. Just pass "activity"

   val layoutManager = LinearLayoutManager(activity)

You can also user

 layoutManager = LinearLayoutManager(requireActivity())

Both will return the getActivity() instance.

Please let me know if you still face the error will help you for sure.

Thanks

Answered By - Rahul Goswami