XRecyclerView实现上拉加载更多和下拉刷新功能

package com.example.recyclerview_demo1.mvp.view.activity;

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.recyclerview_demo1.R;
import com.example.recyclerview_demo1.mvp.model.bean.Tiyu;
import com.example.recyclerview_demo1.utils.OkHttpManager;
import com.google.gson.Gson;
import com.jcodecraeer.xrecyclerview.XRecyclerView;

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

public class Main2Activity extends AppCompatActivity {

    private XRecyclerView xrv;
    private OkHttpManager instance;
    private MAdapter adapter;
    private int operType = 1;
    private int pageIndex = 1;
    private String myurl = "http://365jia.cn/news/api3/365jia/news/headline?page=" + pageIndex;
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
        }
    };
    private List<Tiyu.DataBeanX.DataBean> datas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        xrv = findViewById(R.id.xrv);

        datas = new ArrayList<>();

        initXrv();

        requestNetData();

        xrv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));

    }

    private void requestNetData() {

        instance = OkHttpManager.getInstance();

        instance.asyncJsonStringByURL(myurl, new OkHttpManager.Fun1() {
            @Override
            public void onResponse(String result) {
                Gson gson = new Gson();
                Tiyu tiyu = gson.fromJson(result, Tiyu.class);
                List<Tiyu.DataBeanX.DataBean> list = tiyu.getData().getData();


                if (operType == 1) {
                    datas.clear();
                }

                if (list != null) {

                    datas.addAll(list);

                }

                setAdapter();

            }
        });

    }

    private void initXrv() {

        xrv.setPullRefreshEnabled(true);
        xrv.setLoadingMoreEnabled(true);

        xrv.setLoadingListener(new XRecyclerView.LoadingListener() {
            @Override
            public void onRefresh() {
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        operType = 1;
                        pageIndex = 1;
                        myurl = "http://365jia.cn/news/api3/365jia/news/headline?page=" + pageIndex;
                        requestNetData();
                        xrv.refreshComplete();
                    }
                }, 1000);
            }

            @Override
            public void onLoadMore() {
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        operType = 2;
                        pageIndex++;
                        myurl = "http://365jia.cn/news/api3/365jia/news/headline?page=" + pageIndex;
                        requestNetData();
                        xrv.refreshComplete();
                    }
                }, 1000);
            }
        });

    }

    public void setAdapter() {

        if (adapter == null) {
            adapter = new MAdapter();
            xrv.setAdapter(adapter);
        } else {
            adapter.notifyDataSetChanged();
        }
    }

    class MAdapter extends RecyclerView.Adapter<MAdapter.ViewHolder> {

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            View view = View.inflate(Main2Activity.this, R.layout.xrv_item, null);

            ViewHolder viewHolder = new ViewHolder(view);

            return viewHolder;
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {

            String title = datas.get(position).getTitle();
            holder.tv.setText(title);

        }

        @Override
        public int getItemCount() {
            return datas == null ? 0 : datas.size();
        }

        public class ViewHolder extends RecyclerView.ViewHolder {

            private final TextView tv;

            public ViewHolder(View itemView) {
                super(itemView);
                tv = itemView.findViewById(R.id.tv);
            }
        }
    }
}