关于PullToRefresh对于数据的解析和上拉刷新下拉加载

首先我们需要先导入pulltorefresh的jar包可以从王网上下载，其次导入imageloader的jar包
之后进行代码的开始编写
示例是一个对于图书分类点击进入后，分类书籍的加载
首先开始写一个utils类，

package com.wj.parser.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.content.Context;
import android.util.Log;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.wj.parser.bean.Book;

/**
 * @author Administrator
 * @date 2016-7-28
 */
public class Utils {
	/**
	 * @param url
	 * @return 字节流
	 * @throws IOException
	 */
	public static InputStream getInput(String url) throws IOException {
		URL urlPath = new URL(url);
		HttpURLConnection http = (HttpURLConnection) urlPath.openConnection();
		http.setReadTimeout(5000);
		http.setConnectTimeout(5000);
		http.connect();
		if (http.getResponseCode() == 200) {
			// 开始返回数据
			return http.getInputStream();

		}
		return null;
	}

	public static ArrayList getData(InputStream input)
			throws IOException, XmlPullParserException {
		ArrayList list = null;
		XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
		XmlPullParser pullParser = factory.newPullParser();
		pullParser.setInput(input, "utf-8");
		int type = pullParser.getEventType();
		Book book = null;
		while (type != XmlPullParser.END_DOCUMENT) {
			String name = pullParser.getName();
			switch (type) {
			case XmlPullParser.START_DOCUMENT:
				list = new ArrayList();

				break;

			case XmlPullParser.START_TAG:
				if (name.equals("item")) {
					book = new Book();
					Log.i("kankan", name);
				} else if (name.equals("catalog")) {
					book.setCatalog(pullParser.nextText());
					Log.i("kankan", name);
				} else if (name.equals("id")) {
					book.setId(pullParser.nextText());
					Log.i("kankan", name);
				}
				break;
			case XmlPullParser.END_TAG:
				if (name.equals("item")) {
					list.add(book);
					Log.i("kankan", name);
				}
				break;
			}
			type = pullParser.next();
			Log.i("kankan", type + "");
		}

		return list;
	}

	/**
	 * @param context
	 * @param url
	 * @return 从网络上获取数据
	 * @throws IOException
	 */
	public static String getDataFromHttp(Context context, String url)
			throws IOException {
		InputStream input = getInput(url);
		byte[] by = new byte[1024];
		int len = -1;
		ByteArrayOutputStream bop = new ByteArrayOutputStream();
		while ((len = input.read(by)) != -1) {
			bop.write(by, 0, len);

		}
		return bop.toString("utf-8");
	}

	public static ImageLoader getImageLo(Context context) {
		ImageLoader image = ImageLoader.getInstance();
		image.init(ImageLoaderConfiguration.createDefault(context));

		return image;

	}
}

之后  我们需要在一个主的mainactivity进行逻辑编写

package com.wj.parser;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import org.xmlpull.v1.XmlPullParserException;

import com.wj.parser.base.BaseActivity;
import com.wj.parser.bean.Book;
import com.wj.parser.utils.Utils;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private final String URL = "http://apis.juhe.cn/goodbook/catalog?key=1d93c33c310af960cd9060727d38e8aa&dtype=xml";
	private ListView lv;
	private ArrayList list;
	private long mExitTime;
	private BaseActivity base;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		base=new BaseActivity();
		base.onCreate(this);
		initView();
		new AsyncTask>() {

			@Override
			protected ArrayList doInBackground(String... params) {
				try {
					InputStream input = Utils.getInput(params[0]);
					ArrayList data = Utils.getData(input);
					return data;
				} catch (IOException e) {
					e.printStackTrace();
				} catch (XmlPullParserException e) {
					e.printStackTrace();
				}
				return null;
			}

			protected void onPostExecute(java.util.ArrayList result) {
				list = result;
				lv.setAdapter(new BaseAdapter() {

					@Override
					public View getView(int position, View convertView, ViewGroup parent) {
						convertView = View.inflate(MainActivity.this, android.R.layout.simple_list_item_1, null);
						TextView tv = (TextView) convertView.findViewById(android.R.id.text1);
						tv.setText(list.get(position).getCatalog());
						return convertView;
					}

					@Override
					public long getItemId(int position) {
						return position;
					}

					@Override
					public Object getItem(int position) {
						return null;
					}

					@Override
					public int getCount() {
						return list.size();
					}
				});
				lv.setOnItemClickListener(new OnItemClickListener() {

					@Override
					public void onItemClick(AdapterView parent, View view, int position, long id) {
						// 设置跳转到详情页面
						Intent intent = new Intent(MainActivity.this, IndexActivity.class);
						// 带值传参
						intent.putExtra("bean", list.get(position));
						startActivity(intent);

					}
				});

			};
		}.execute(URL);
	}

	private void initView() {
		lv = (ListView) findViewById(R.id.tt);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        if ((System.currentTimeMillis() - mExitTime) > 2000) {
                Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
                mExitTime = System.currentTimeMillis();
        } else {
              base.onDestroy();
        }
        return true;
}
	return super.onKeyDown(keyCode, event);
}

}

之后  还有一个数据跳转展示  一个分类的数值

package com.wj.parser;

import java.io.IOException;
import java.util.ArrayList;


import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.wj.parser.bean.Book;
import com.wj.parser.bean.MessageList;
import com.wj.parser.bean.MessageResult;
import com.wj.parser.utils.Utils;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

@SuppressLint("HandlerLeak")
public class IndexActivity extends Activity {
	private PullToRefreshGridView gv;
	private ImageLoader imageLoder;
	private int x = 10;
	private int y = 10;
	private Book book;
	private BaseAdapter base;
	Handler mHandler = new Handler() {

		public void handleMessage(android.os.Message msg) {
			imageLoder = Utils.getImageLo(IndexActivity.this);
			String str = null;
			str = (String) msg.obj;
			Gson gson = new Gson();
			MessageResult result = gson.fromJson(str, MessageResult.class);
			MessageList list = result.getResult();
			final ArrayList data = list.getData();
		    base=new BaseAdapter() {

				@Override
				public View getView(int position, View convertView, ViewGroup parent) {
					convertView = View.inflate(IndexActivity.this, R.layout.gv_item, null);
					ImageView ima = (ImageView) convertView.findViewById(R.id.ima_item);
					TextView tv = (TextView) convertView.findViewById(R.id.tv_item);
					imageLoder.displayImage(data.get(position).getImg(), ima);
					tv.setText(data.get(position).getTitle());
					return convertView;
				}

				@Override
				public long getItemId(int position) {
					return position;
				}

				@Override
				public Object getItem(int position) {
					return data.get(position);
				}

				@Override
				public int getCount() {
					return data.size();
				}
			};
			gv.setAdapter(base);
			gv.setOnRefreshListener(new OnRefreshListener() {

				@Override
				public void onRefresh(PullToRefreshBase refreshView) {
					y = y + 10;

					new Thread() {
						public void run() {
							try {
								requestData(book, x, y);
							    
							} catch (IOException e) {
								e.printStackTrace();
							}

						};
					}.start();
				Toast.makeText(IndexActivity.this, y+"", Toast.LENGTH_SHORT).show();
					// 开始刷新
					 base.notifyDataSetChanged();
				     gv.onRefreshComplete();
				}
			});
		};
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_index);
		gv = (PullToRefreshGridView) findViewById(R.id.gv);
		Intent intent = getIntent();
		book = (Book) intent.getSerializableExtra("bean");
		Log.i("kankan", book.getId() + "");
		// 开始请求数据
		new Thread() {
			public void run() {
				try {
					requestData(book, x, y);
				} catch (IOException e) {
					e.printStackTrace();
				}

			};
		}.start();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.index, menu);
		return true;
	}

	private void requestData(final Book book, int x, int y) throws IOException {
		String http = Utils.getDataFromHttp(IndexActivity.this, "http://apis.juhe.cn/goodbook/query?key=1d93c33c310af960cd9060727d38e8aa&catalog_id="
				+ book.getId() + "&rn=" + x + "&rn=" + y);
		Message msg = mHandler.obtainMessage();
		msg.obj = http;
		mHandler.sendMessage(msg);

	}
}

最后 展示一下被pulltorefresh覆盖的控件