Expandable Recyclerview findViewById(int) cannot be resolved

manpreet Best Answer 2 years ago

error findViewById(int) cannot resolve method

trying to achieve in fragment

A custom RecyclerView which allows for an expandable view to be attached to each ViewHolder

Is there a way i could click operation in expanded view

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.bignerdranch.expandablerecyclerview.Model.ParentObject;
import com.blipclap.engineering_solution.Adapter.adapter;
import com.blipclap.engineering_solution.Models.TitleChild;
import com.blipclap.engineering_solution.Models.TitleCreator;
import com.blipclap.engineering_solution.Models.TitleParent;

import java.util.ArrayList;
import java.util.List;


public class SYFragment extends Fragment {
    RecyclerView recyclerView;

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        ((adapter)recyclerView.getAdapter()).onSaveInstanceState(outState);
    }

    @Override
    public void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        recyclerView =(RecyclerView)findViewById(R.id.recyclerview);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        adapter adapter =new adapter(getActivity(),initData());
        adapter.setParentClickableViewAnimationDefaultDuration();
        adapter.setParentAndIconExpandOnClick(
                                                

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