ListView下拉加载二(分页)

这次在一的基础上做了数据通过HttpClient远程获取显示 并且分页，首先看下效果吧：

以上就是效果图了 下面看下具体代码实现吧

主要代码和上节差不多

主入口代码：

package com.tp.soft.app;

import java.io.IOException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.text.format.Time;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.tp.soft.entity.Article;
import com.tp.soft.http.HttpUtil;
import com.tp.soft.io.IOUtil;
import com.tp.soft.util.Constant;

public class MainActivity extends Activity implements OnScrollListener, OnItemClickListener{

    private ListView mListView;
    
    private View mLoadMoreView;
    
    private ProgressBar mLoadBtn;
    
    private PageAdapter adapter;
    
    private Handler handler = new Handler();
    
    private int curPage;
    
    private int visibleItemCount;       // 当前窗口可见项总数  
     
    private int visibleLastIndex = 0;   //最后的可视项索引   
    
    private long total;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mLoadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null);
        mLoadBtn = (ProgressBar) mLoadMoreView.findViewById(R.id.progressBar1);
        //mLoadBtn.setOnClickListener(this);
        
        mListView = (ListView) findViewById(R.id.menuList);
        
        
        mListView.addFooterView(mLoadMoreView);
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("curPage", 1);
        params.put("limit", 10);
        List<Article> articleList = getArticleList(params);
        adapter = new PageAdapter(articleList);
        mListView.setAdapter(adapter);
        
        //下拉滚动触发事件
        mListView.setOnScrollListener(this);
        mListView.setOnItemClickListener(this);
    }

    private List<Article> getArticleList(Map<String, Object> params) {
        HttpResponse response = HttpUtil.getHttpResponse(Constant.FINDARTICLE, params, Constant.ENCODING);
        List<Article> articles = new ArrayList<Article>();
        if(response!=null){
            if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                try{
                    IOUtil ioUtil = new IOUtil();
                    String resultJson = ioUtil.getJson(response.getEntity().getContent());
                    JSONObject jsonObject = new JSONObject(resultJson);
                    curPage = jsonObject.getInt("curPage");
                    total = jsonObject.getLong("total");
                    JSONArray jsonArray = jsonObject.getJSONArray("rows");
                    for (int i = 0; i < jsonArray.length(); i++) {
                        JSONObject obj = jsonArray.getJSONObject(i);
                        int id = obj.getInt("a_id");
                        String title = obj.getString("title");
                        String content = obj.getString("content");
                        Timestamp creat_time = new Timestamp(obj.getLong("create_time"));
                        Article article = new Article();
                        article.setA_id(id);
                        article.setTitle(title);
                        article.setContent(content);
                        article.setCreate_time(creat_time);
                        articles.add(article);
                    }
                }catch (IOException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }
        return articles;
    }

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

    /*@Override
    public void onClick(View v) {
        mLoadBtn.setText("正在加载中...");
        MyRunnable r = new MyRunnable();
        handler.postDelayed(r, 2000);
    }*/
    
    
    class MyRunnable implements Runnable{
        @Override
        public void run() {
            Log.e("visibleLastIndex", visibleLastIndex+"");
            if(visibleLastIndex== total + 1){
                mListView.removeFooterView(mLoadMoreView);
                adapter.notifyDataSetChanged();
                Toast.makeText(MainActivity.this, "数据全部加载完成", Toast.LENGTH_SHORT).show();
            }else{
                loadMoreDate();
            }
            
            //更新UI
            adapter.notifyDataSetChanged();
            //mLoadBtn.setText("查看更多...");
        }
    }
    
    
    
    class PageAdapter extends BaseAdapter {
        
        List<Article> itemList;
        
        public PageAdapter(List<Article> itemList){
            this.itemList = itemList;
        }
        
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if(convertView == null){
                convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.menu, null);
            }
            TextView titleView = (TextView) convertView.findViewById(R.id.showView);
            TextView contentView = (TextView) convertView.findViewById(R.id.content);
            titleView.setText(itemList.get(position).getTitle());
            contentView.setText(itemList.get(position).getContent());
            
            return convertView;
        }
        
        @Override
        public long getItemId(int position) {
            return position;
        }
        
        @Override
        public Object getItem(int position) {
            return itemList.get(position);
        }
        
        @Override
        public int getCount() {
            return itemList.size();
        }
        
        public void addItem(Article article){
            itemList.add(article);
        }
    }
    
    private void loadMoreDate() {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("curPage", curPage + 1);
        params.put("limit", 10);
        List<Article> articleList = getArticleList(params);
        for (Article article : articleList) {
            adapter.addItem(article);
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        visibleLastIndex = totalItemCount;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        //不滚动
        if(scrollState == OnScrollListener.SCROLL_STATE_IDLE){
            //滚动最底部
            if(view.getLastVisiblePosition() == view.getCount() -1){
                //mLoadBtn.setText("正在加载中...");
                MyRunnable r = new MyRunnable();
                handler.postDelayed(r, 2000);
            }
        }
        
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long arg3) {
        ListView listView = (ListView) parent;
        Article article = (Article) listView.getItemAtPosition(position);
        Intent intent = new Intent(MainActivity.this, ArticleDetalActivity.class);
        intent.putExtra("article", article);
        startActivity(intent);
    }
    
}

文章详细信息显示ArticleDetalActivity代码：

package com.tp.soft.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;

import com.tp.soft.entity.Article;
import com.tp.soft.util.DateUtil;

public class ArticleDetalActivity extends Activity implements OnClickListener{

    private Handler handler = new Handler();
    
    private TextView mTitle;
    private TextView mContent;
    private TextView mTime;
    
    private ImageButton mBackBtn;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_article_detal);
        
        mTitle = (TextView) findViewById(R.id.d_title);
        mContent = (TextView) findViewById(R.id.d_content);
        mTime = (TextView) findViewById(R.id.d_time);
        
        mBackBtn = (ImageButton) findViewById(R.id.backBtn);
        
        Intent intent = getIntent();
        Article article = (Article) intent.getSerializableExtra("article");
        mTitle.setText(article.getTitle());
        mContent.setText(article.getContent());
        mTime.setText("发表日期："+DateUtil.timestampToStr(article.getCreate_time(), "yyyy-MM-dd HH:mm:ss"));
        
        mBackBtn.setOnClickListener(this);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.article_detal, menu);
        return true;
    }


    @Override
    public void onClick(View v) {
        ArticleDetalActivity.this.setResult(RESULT_OK, getIntent());
        ArticleDetalActivity.this.finish();
    }
}

HttpUtil封装：

package com.tp.soft.http;

import java.net.SocketTimeoutException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

import android.util.Log;

public class HttpUtil {
    public static HttpResponse getHttpResponse(String serverPath, Map<String, Object> params, String encoding){
        List<NameValuePair> pairs = new ArrayList<NameValuePair>();
        if(null != params && !params.isEmpty()){
            for(Map.Entry<String, Object> entry : params.entrySet()){
                pairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
            }
        }
        
        HttpResponse response = null;
        try {
            HttpPost post = new HttpPost(serverPath);
            post.setEntity(new UrlEncodedFormEntity(pairs, encoding));
            response = getHttpClient().execute(post);
        }catch (ConnectTimeoutException e) {
            Log.e("提示", "连接超时");
            return null;
        } catch (SocketTimeoutException e) {
            Log.e("提示", "Socket连接超时");
            return null;
        } catch (Exception e) {
            Log.e("提示", e.getLocalizedMessage());
            return null;
        }
        return response;
    }

    public static synchronized HttpClient getHttpClient(){
        HttpParams params = new BasicHttpParams();
        ConnManagerParams.setTimeout(params, 3000);
        HttpConnectionParams.setConnectionTimeout(params, 3000);
        HttpConnectionParams.setSoTimeout(params, 3000);
        
        // 设置我们的HttpClient支持HTTP和HTTPS两种模式
        SchemeRegistry schReg = new SchemeRegistry();
        schReg.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
        schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
        
        // 使用线程安全的连接管理来创建HttpClient
        ClientConnectionManager conMgr = new ThreadSafeClientConnManager(params, schReg);
        HttpClient client = new DefaultHttpClient(conMgr ,params);
        return client;
    }
}

服务器代码：

@POST
    @Path(value="/findArticle")
    @Produces(MediaType.APPLICATION_JSON)
    @Override
    public Result findArticleAll(@FormParam(value="curPage") String curPage, @FormParam(value="limit") String limit)throws BaseServiceException {
        Result result = new Result();
        List<Article> aList = new ArrayList<Article>();
        Article article = new Article();
        article.setPageable(true);
        article.setStart((Integer.parseInt(curPage) - 1) * Integer.parseInt(limit));
        article.setLimit(Integer.parseInt(limit));
        try{
            aList = articleDao.find(article);
        }catch (DataAccessException e) {
            LOG.error("【ibatis】查询文章列表失败", e);
            throw new BaseServiceException(e.getLocalizedMessage());
        }
        
        long total = 0;
        try{
            total = articleDao.getTotal(article);
        }catch (DataAccessException e) {
            LOG.error("【ibatis】查询文章总数失败", e);
            throw new BaseServiceException(e.getLocalizedMessage());
        }
        result.setRows(aList);
        result.setCurPage(Integer.parseInt(curPage));
        result.setTotal(total);
        return result;
    }

核心代码就这么多了 界面代码就不一一贴出了 

想要具体代码可以到http://download.csdn.net/detail/taopeng_100/7864393地址下载