android官方下拉刷新控件SwipeRefreshLayout的使用

package com.example.nanchen.swiperefreshlayoutdemo;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

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

public class MainActivity extends AppCompatActivity implements AbsListView.OnScrollListener {

    private SwipeRefreshLayout swipeRefreshLayout;
    private ListView lv;
    private ArrayAdapter adapter;
    private List list;
    private View footerView;

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0x101:
                    if (swipeRefreshLayout.isRefreshing()){
                        adapter.notifyDataSetChanged();
                        swipeRefreshLayout.setRefreshing(false);//设置不刷新
                    }
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.main_srl);
        lv = (ListView) findViewById(R.id.main_lv);

        footerView = getLayoutInflater().inflate(R.layout.loading_layout,null);
        lv.addFooterView(footerView);

        lv.setOnScrollListener(this);

        list = new ArrayList<>();
        list.addAll(Arrays.asList("Java","php","C++","C#","IOS","html","C","J2ee","j2se","VB",".net","Http","tcp","udp","www"));

        adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,
                android.R.id.text1,list);
        lv.setAdapter(adapter);

        swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
                android.R.color.holo_orange_light, android.R.color.holo_red_light);

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                new LoadDataThread().start();
            }
        });
    }

    private int visibleLastIndex;//用来可显示的最后一条数据的索引
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if(adapter.getCount() == visibleLastIndex && scrollState == SCROLL_STATE_IDLE){
            new LoadDataThread().start();
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        visibleLastIndex = firstVisibleItem + visibleItemCount - 1;//减去最后一个加载中那条
    }



    /**
     * 模拟加载数据的线程
     */
    class LoadDataThread extends  Thread{
        @Override
        public void run() {
            initData();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            handler.sendEmptyMessage(0x101);//通过handler发送一个更新数据的标记
        }

        private void initData() {
            list.addAll(Arrays.asList("Json","XML","UDP","http"));
        }
    }





}