RecyclerView过滤item 配合SerchView

       SearchView searchView = findViewById(R.id.searchView);
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                adapter.getFilter().filter(newText);
                System.out.println(newText);
                if (newText.isEmpty())
                    adapter.notifyDataSetChanged();
                return false;
            }
        });

package com.xy.heying.constact.adapter;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;


import com.xy.heying.constact.cn.CNPinyin;
import com.xy.heying.constact.search.Contact;
import com.xy.heying.constact.stickyheader.StickyHeaderAdapter;

import java.util.ArrayList;
import java.util.List;
import com.xy.heying.R;
/**
 * Created by you on 2017/9/11.
 */
			//这里要实现监听
public class ContactAdapter extends RecyclerView.Adapter<ContactHolder> implements StickyHeaderAdapter<HeaderHolder> , Filterable {

    private List<CNPinyin<Contact>> mSourceList = new ArrayList<>();
    private List<CNPinyin<Contact>> mFilterList = new ArrayList<>();


    public ContactAdapter(List<CNPinyin<Contact>> cnPinyinList) {
        this.mSourceList = cnPinyinList;
        this.mFilterList = cnPinyinList;
    }

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

    @NonNull
    @Override
    public ContactHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ContactHolder(LayoutInflater.from(parent.getContext())
                .inflate(R.layout.activity_main_item, parent, false));
    }

    @Override
    public void onBindViewHolder(ContactHolder holder, final int position) {
        final Contact contact = mFilterList.get(position).data;
        holder.iv_header.setImageResource(contact.imgUrl);
        holder.tv_name.setText(contact.name);
        holder.tv_phone_num.setText(contact.phonenum);
        //
        holder.ll_constact_item.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });
    }

    @Override
    public long getHeaderId(int childAdapterPosition) {
        return mFilterList.get(childAdapterPosition).getFirstChar();
    }

    @Override
    public void onBindHeaderViewHolder(HeaderHolder holder, int childAdapterPosition) {
        holder.tv_header.setText(String.valueOf(mFilterList.get(childAdapterPosition).getFirstChar()));
    }

    @Override
    public HeaderHolder onCreateHeaderViewHolder(ViewGroup parent) {
        return new HeaderHolder(LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_header, parent, false));
    }



    //过滤监听
    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                String charString = charSequence.toString();
                if (charString.isEmpty()) {
                    mFilterList = mSourceList;
                } else {
                    List<CNPinyin<Contact>> filteredList = new ArrayList<>();
                    for (CNPinyin<Contact> str : mSourceList) {
                        //这里根据需求，添加匹配规则
                        if (str.data.name.contains(charString)) {
                            filteredList.add(str);
                        }
                    }

                    mFilterList = filteredList;
                }

                FilterResults filterResults = new FilterResults();
                filterResults.values = mFilterList;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                mFilterList = (List<CNPinyin<Contact>>) filterResults.values;
                //刷新数据
                notifyDataSetChanged();
            }
        };
    }



}