ListView下拉加载二(分页)_移动开发

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ListView下拉加载二(分页)

2014/9/4 19:22:54 L_O_V_E_Java 程序员俱乐部我要评论(0)

摘要：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：packagecom.tp.soft.app;importjava.io.IOException;importjava.sql.Timestamp;importjava.util.ArrayList;importjava.util.HashMap;importjava.util.List;importjava.util.Map
标签：view list

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;
    }