[SOLVED] - OnLongClickListener not working

public class RecyclerViewAdapter extends RecyclerView.Adapter {
    private final MainFragment.OnListItemSelectedInterface mListener;
    private final MainFragment.OnListItemLongSelectedInterface mLongListener;

    public RecyclerViewAdapter(MainFragment.OnListItemSelectedInterface listener, MainFragment.OnListItemLongSelectedInterface longListener) {
        mListener = listener;
        mLongListener = longListener;
    }


    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.llist_item_vertical, parent, false);
        return new ListViewHolder(view);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        ((ListViewHolder)holder).bindView(position);
    }

    @Override
    public int getItemCount() {
        //change to how many items are in the list or should be displayed in the list
        return Exercises.mainList.length;
    }

    private class ListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener{
        private TextView mTextView1;
        private ImageView mImageView;
        private int mIndex;

        public ListViewHolder(View itemView) {
            super(itemView);
            mTextView1 = (TextView) itemView.findViewById(R.id.textView);

            itemView.setOnClickListener(this);
        }

        public void bindView(int position){
            mTextView1.setText(Exercises.mainList[position]);
            mIndex = position;
        }

        @Override
        public void onClick(View v) {
            mListener.onItemSelected(mIndex);
        }

        @Override
        public boolean onLongClick(View v) {
            mLongListener.onItemLongSelected(mIndex);
            return true;
        }
    }
}

public interface OnListItemLongSelectedInterface{
        void onItemLongSelected(int index);
    }

    public interface OnListItemSelectedInterface {
        void onItemSelected(int index);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        OnListItemSelectedInterface listener = (OnListItemSelectedInterface)getActivity();
        OnListItemLongSelectedInterface longlistener = (OnListItemLongSelectedInterface)getActivity();


        View view = inflater.inflate(R.layout.fragment_main, container, false);

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.listRecyclerView);
        RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(listener, longlistener);
        recyclerView.addItemDecoration(new Divider(getActivity()));
        recyclerView.setAdapter(recyclerViewAdapter);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);

 @Override
    public void onItemLongSelected(int index) {
        Toast.makeText(this, "Delete selected item with prompt message " + index, Toast.LENGTH_SHORT).show();
    }