Android ListView使用方法，处理Json数据

[转自]http://blog.csdn.net/woshisap/article/details/6621571

package cn.capinfotech.json;

import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
     private static final String TAG = "MainActivity";
     private List<HashMap<String, Object>> videos = null;
     private HashMap<String, Object> video = null;
     
     private ListView listView = null;
     private static String url = "http://10.0.2.2:8088/Struts2_sxt/getjson.action";  
     
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        listView = (ListView)findViewById(R.id.videos);
        getPDAServerData(url);
        
    }
 
    private void getPDAServerData(String url) {  
            HttpClient client = new DefaultHttpClient();  
            //提拱默认的HttpClient实现  
            HttpPost request;  
            try {  
                request = new HttpPost(new URI(url));  
                HttpResponse response = client.execute(request);  
                // 判断请求是否成功  
                if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功  
                    HttpEntity entity = response.getEntity();  
                    if (entity != null) {  
                        String out = EntityUtils.toString(entity, "UTF-8");  
                        Log.i(TAG, out);
                        
                        JSONArray jsonArray = new JSONArray(out);
                        
                        videos = new ArrayList<HashMap<String, Object>>();
                        for(int i = 0; i<jsonArray.length(); i++) {
                            JSONObject jsonObject = (JSONObject) jsonArray.get(i);
                            int id = jsonObject.getInt("id");
                            String name = jsonObject.getString("title");
                            int timelength = jsonObject.getInt("timelength");
                            
                            video = new HashMap<String, Object>();
                            video.put("id", id);
                            video.put("name", name);
                            video.put("timelength", "时长为:" + timelength);
                            
                            videos.add(video);
                        }
                        
                        SimpleAdapter adapter = new SimpleAdapter(this, videos, R.layout.item, 
                                                               new String[]{"name", "timelength"},
                                                               new int[]{R.id.title, R.id.timelength}
                                                 );
                        listView.setAdapter(adapter);
                        
                    }
                }
            } catch(Exception e) {
                e.printStackTrace();
                Log.e(TAG, e.toString());
                Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_LONG).show();
            }
    }
}

需要注意的事，ListView需要一个显示Item的layout, 上面第73行的R.layout.item就是这个东西。第75行的R.id...也是这个layout里面的控件的id。