首页 > 代码库 > ListView下拉加载二(分页)

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=http://www.mamicode.com/"curPage") String curPage, @FormParam(value=http://www.mamicode.com/"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

ListView下拉加载二(分页)