比较美观的ListView下拉刷新上拉加载

package com.example.demo;

import java.util.LinkedList;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

import com.bwie.guoxinbo20160505.pullToRefresh.Bean;
import com.bwie.guoxinbo20160505.pullToRefresh.Bean.MyData;
import com.bwie.guoxinbo20160505.pullToRefresh.MyAdapter;
import com.bwie.guoxinbo20160505.pullToRefresh.PullToRefreshLayout;
import com.bwie.guoxinbo20160505.pullToRefresh.PullToRefreshLayout.OnRefreshListener;
import com.bwie.guoxinbo20160505.pullToRefresh.PullableListView;
import com.google.gson.Gson;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;













public class MainActivity extends Activity {

	private PullToRefreshLayout layout;
	private PullableListView listView;
	private String url = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=242&pn=0&rn=10";
	private boolean flag=true;
	private LinkedList<MyData> list2;
	private LinkedList<MyData> list;
	private MyAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		layout = (PullToRefreshLayout) findViewById(R.id.layoutboke);
		listView = (PullableListView) findViewById(R.id.listviboke);

		
		new MyAsync().execute();
		layout.setOnRefreshListener(new OnRefreshListener() {

			// 刷新
			@Override
			public void onRefresh(PullToRefreshLayout pullToRefreshLayout) {
				String url1 = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=242&pn=10&rn=10";
				
				getJson(url1, pullToRefreshLayout);
			
			}

			// 加载
			@Override
			public void onLoadMore(final PullToRefreshLayout pullToRefreshLayout) {

				String url2 = "http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=242&pn=20&rn=10";
				
			   getJson(url2, null);	
			   new Handler().postDelayed(new Runnable() {
				
				@Override
				public void run() {
					   pullToRefreshLayout.loadmoreFinish(PullToRefreshLayout.SUCCEED);
				}
			}, 2000);
			
			}
		});
	}

	
	// 获取数据
	private void getJson( String url,final PullToRefreshLayout pullToRefreshLayout) {
		HttpUtils utils = new HttpUtils();
		utils.configResponseTextCharset("utf-8");
		utils.send(HttpMethod.POST, url, new RequestCallBack<String>() {

	

			@Override
			public void onFailure(HttpException arg0, String arg1) {
			}

			@Override
			public void onSuccess(ResponseInfo<String> arg0) {
				String json = arg0.result;
				Gson gson = new Gson();
				Bean bean = gson.fromJson(json, Bean.class);
				// 证明是第一次请求网络
				if (flag) {
					list = bean.result.data;
					adapter = new MyAdapter(MainActivity.this, list);
					listView.setAdapter(adapter);
//					gv_view.onRefreshComplete();
//					pullToRefreshLayout.loadmoreFinish(PullToRefreshLayout.SUCCEED);
					flag = false;
				} else {
					// 执行下拉刷新或者上拉加载的时候，进入此判断。通过判断boolean的值来判断是什么操作。

					if (pullToRefreshLayout==null) {
						// 上拉加载，加载出的数据在数据的底部。
						list2 = bean.result.data;
						for (MyData myData : list2) {
							list.add(myData);
						}
//						gv_view.onRefreshComplete();
						
						adapter.notifyDataSetChanged();
					} else {
						// 下拉刷新，刷新出来的数据在数据的顶部，之前的数据还在。
						list2 = bean.result.data;
						for (MyData myData : list2) {
							list.addFirst(myData);
						}
//						gv_view.onRefreshComplete();
						pullToRefreshLayout
						.refreshFinish(PullToRefreshLayout.SUCCEED);
						adapter.notifyDataSetChanged();
					}
				
				}
			}
		});
	}

	// 异步加载
	class MyAsync extends AsyncTask<String, Integer, String> {

		@Override
		protected String doInBackground(String... params) {
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			getJson(url, null);
			super.onPostExecute(result);
		}
	}

}