ExpandableListView using recyclerview. That also can have multiple adapters based on groups

ExpandableListView Using RecyclerView.java

ExpandableListAdapter.java             |
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import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.zeephr.one.R;
import com.zeephr.one.models.HeaderName;
import com.zeephr.one.models.PatientMedication;
import com.zeephr.one.models.PatientProblem;

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

/**
 * Created by SYSTEM on 24-09-2015.
 */
public class ExpandableListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    public static final int HEADER = 0;
    public static final int CHILD = 1;


    public static final int CHILD_MEDICATION = 1;
    public static final int CHILD_PROBLEM = 2;

    private List<Item> data;

    public ExpandableListAdapter(List<Item> data) {
        this.data = data;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
        View view = null;
        LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        Context context = parent.getContext();
        float dp = context.getResources().getDisplayMetrics().density;
        int subItemPaddingLeft = (int) (18 * dp);
        int subItemPaddingTopAndBottom = (int) (5 * dp);
        switch (type) {
            case HEADER:
                view = inflater.inflate(R.layout.list_header, parent, false);
                ListHeaderViewHolder header = new ListHeaderViewHolder(view);
                return header;
            case CHILD_MEDICATION:
                view = inflater.inflate(R.layout.adpt_patient_medication, parent, false);
                ViewHolderMedication childMedication = new ViewHolderMedication(view);
                return childMedication;

            case CHILD_PROBLEM:
                view = inflater.inflate(R.layout.adpt_patient_problem, parent, false);
                ViewHolderProblem childProblem = new ViewHolderProblem(view);
                return childProblem;

        }
        return null;
    }

    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        final Item item = data.get(position);
        switch (item.type) {
            case HEADER:
                final ListHeaderViewHolder itemController = (ListHeaderViewHolder) holder;
                itemController.refferalItem = item;
                //itemController.header_title.setText(item.text);


                if (data.get(position).text instanceof HeaderName) {
                    HeaderName lclObj= (HeaderName) data.get(position).text;
                    itemController.header_title.setText(lclObj.getmName());
                }



                if (item.invisibleChildren == null) {
                    itemController.btn_expand_toggle.setImageResource(R.drawable.ic_launcher);
                } else {
                    itemController.btn_expand_toggle.setImageResource(R.drawable.ic_launcher);
                }
                itemController.btn_expand_toggle.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (item.invisibleChildren == null) {
                            item.invisibleChildren = new ArrayList<Item>();
                            int count = 0;
                            int pos = data.indexOf(itemController.refferalItem);
                            while (data.size() > pos + 1 && data.get(pos + 1).type == CHILD_MEDICATION ||
                                    data.size() > pos + 1 && data.get(pos + 1).type == CHILD_PROBLEM) {
                                item.invisibleChildren.add(data.remove(pos + 1));
                                count++;
                            }
                            notifyItemRangeRemoved(pos + 1, count);
                            itemController.btn_expand_toggle.setImageResource(R.drawable.ic_launcher);
                        } else {
                            int pos = data.indexOf(itemController.refferalItem);
                            int index = pos + 1;
                            for (Item i : item.invisibleChildren) {
                                data.add(index, i);
                                index++;
                            }
                            notifyItemRangeInserted(pos + 1, index - pos - 1);
                            itemController.btn_expand_toggle.setImageResource(R.drawable.ic_launcher);
                            item.invisibleChildren = null;
                        }
                    }
                });
                break;
            case CHILD_MEDICATION:

                ViewHolderMedication medicationController = (ViewHolderMedication) holder;

                if (data.get(position).text instanceof PatientMedication) {
                    PatientMedication lclObj= (PatientMedication) data.get(position).text;
                    medicationController.txtTitleId.setText(lclObj.getMedicationname());
                }
                break;
            case CHILD_PROBLEM:

                ViewHolderProblem problemsController = (ViewHolderProblem) holder;

                if (data.get(position).text instanceof PatientProblem) {
                    PatientProblem lclObj= (PatientProblem) data.get(position).text;
                    problemsController.txtTitleId.setText(lclObj.getProblem_name());
                }

                break;
        }
    }

    @Override
    public int getItemViewType(int position) {
        return data.get(position).type;
    }

    @Override
    public int getItemCount() {
        return data.size();
    }

    private static class ListHeaderViewHolder extends RecyclerView.ViewHolder {
        public TextView header_title;
        public ImageView btn_expand_toggle;
        public Item refferalItem;

        public ListHeaderViewHolder(View itemView) {
            super(itemView);
            header_title = (TextView) itemView.findViewById(R.id.header_title);
            btn_expand_toggle = (ImageView) itemView.findViewById(R.id.btn_expand_toggle);
        }
    }


    public class ViewHolderMedication extends RecyclerView.ViewHolder {

        public TextView txtTitleId, txtModifiedId, txtCauseId, txtFromId, txtToId;
        public ImageButton btnEditId, btnDeleteId;
        public CardView card_view;

        public ViewHolderMedication(View itemLayoutView) {
            super(itemLayoutView);
            txtTitleId = (TextView) itemLayoutView.findViewById(R.id.txtTitleId);
            txtModifiedId = (TextView) itemLayoutView.findViewById(R.id.txtModifiedId);
            txtCauseId = (TextView) itemLayoutView.findViewById(R.id.txtCauseId);
            txtFromId = (TextView) itemLayoutView.findViewById(R.id.txtFromId);
            txtToId = (TextView) itemLayoutView.findViewById(R.id.txtToId);
            btnEditId = (ImageButton) itemLayoutView.findViewById(R.id.btnEditId);
            btnDeleteId = (ImageButton) itemLayoutView.findViewById(R.id.btnDeleteId);
            card_view = (CardView) itemLayoutView.findViewById(R.id.card_view);


        }

    }


    public class ViewHolderProblem extends RecyclerView.ViewHolder {

        public TextView txtTitleId,txtIsActiveId,txtFromId,txtToId;
        public ImageButton btnEditId,btnDeleteId;
        public CardView card_view;

        public ViewHolderProblem(View itemLayoutView) {
            super(itemLayoutView);
            txtTitleId = (TextView) itemLayoutView.findViewById(R.id.txtTitleId);
            txtIsActiveId = (TextView) itemLayoutView.findViewById(R.id.txtIsActiveId);
            txtFromId = (TextView) itemLayoutView.findViewById(R.id.txtFromId);
            txtToId = (TextView) itemLayoutView.findViewById(R.id.txtToId);
            btnEditId = (ImageButton) itemLayoutView.findViewById(R.id.btnEditId);
            btnDeleteId = (ImageButton) itemLayoutView.findViewById(R.id.btnDeleteId);
            card_view = (CardView) itemLayoutView.findViewById(R.id.card_view);
        }

    }

    public static class Item {
        public int type;
        public Object text;
        public List<Item> invisibleChildren;

        public Item() {
        }

        public Item(int type, Object text) {
            this.type = type;
            this.text = text;
        }
    }
}

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FrgPatientFamilyFather.java            |
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import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
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.zeephr.one.R;
import com.zeephr.one.adapters.ExpandableListAdapter;
import com.zeephr.one.models.HeaderName;
import com.zeephr.one.models.PatientMedication;
import com.zeephr.one.models.PatientProblem;

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

/**
 * Created by SYSTEM on 24-09-2015.
 */
public class FrgPatientFamilyFather extends Fragment {

    private RecyclerView recyclerview;

    public FrgPatientFamilyFather() {
    }

    public static FrgPatientFamilyFather newInstance() {
        FrgPatientFamilyFather fragment = new FrgPatientFamilyFather();
        return fragment;
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.frg_patient_family_father, container, false);

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        //((AppCompatActivity) getActivity()).getSupportActionBar().setTitle(getString(R.string.screen_name_target));


        recyclerview = (RecyclerView) getActivity().findViewById(R.id.recyclerview);
        recyclerview.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
        List<ExpandableListAdapter.Item> data = new ArrayList<>();


        Object obj = null;
        HeaderName mName;

        mName=new HeaderName();
        mName.setmName("Medication");
        obj=new Object();
        obj=mName;
        data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, obj));

        for(int i=0;i<2;i++){
            obj=new Object();
            PatientMedication mediCationObj=new PatientMedication();
            mediCationObj.setMedicationname("Medication-"+i);
            obj=mediCationObj;
            data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD_MEDICATION, obj));
        }


        mName=new HeaderName();
        mName.setmName("Problems");
        obj=new Object();
        obj=mName;
        data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, obj));

        for(int i=0;i<2;i++){
            obj=new Object();
            PatientProblem problemObj=new PatientProblem();
            problemObj.setProblem_name("Problems-" + i);
            obj=problemObj;
            data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD_PROBLEM, obj));
        }



        recyclerview.setAdapter(new ExpandableListAdapter(data));






    }
}