ListView下拉加载二(分页)

时间：2021-06-17 18:19:03

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：

ListView下拉加载二(分页)

ListView下拉加载二(分页)

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 = ;   //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", );

        params.put("limit", );

        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 = ; 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 + ){

                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 + );

        params.put("limit", );

        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() -){

                //mLoadBtn.setText("正在加载中...");

                MyRunnable r = new MyRunnable();

                handler.postDelayed(r, );

            }

        }

    }

    @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, );

        HttpConnectionParams.setConnectionTimeout(params, );

        HttpConnectionParams.setSoTimeout(params, );

        // 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(), ));

        schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), ));

        // 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) - ) * 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 = ;

        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

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