剛剛入門學習了Android的ListView，也是看了傳智播客黎活明老師的視訊學習了，但是一直執行不了，還報錯了。報的錯誤是：at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1......省略後面的了。。。。。後面上網查找了一下資料，原因是Android4.0以後訪問網路要在子執行緒裡執行；不能在主程式裡執行。查找了一下資料對這個例子進行了改進，下面連結的例子程式碼就是視訊裡面的差不多的程式碼：http://blog.csdn.net/lynxzong/article/details/12435451

下面的是我在這個例子上改過的程式碼，只是改動了MainActivity而已，其他的跟上面連結的程式碼一樣的。希望各位多多指導；有寫錯或者寫不好的地方求改正。。。

package com.example.videonews;

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

import com.example.domain.News;
import com.example.service.VideoNewsService;

import android.support.v7.app.ActionBarActivity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

	private Context context;
	private ListView listview;
	private ProgressDialog dialog;
	private SimpleAdapter adapter;
	private VideoNewsService videoNewsService;
	private List<News> videosList = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		context = MainActivity.this;
		
		/**初始化介面**/
		initView();
		
		/**載入基本的控制元件，並設定載入時候的滾動條**/
		dialog = new ProgressDialog(context);
		dialog.setMessage("正在載入資料...");
		dialog.setCancelable(false);
		dialog.show();
		Thread thread=new Thread(new loadListRunnable());
		thread.start();
		
	}

	

	/**
	 * *初始化介面
	 */
	private void initView() {
		listview=(ListView) findViewById(R.id.listview);
	}

	public class loadListRunnable implements Runnable {

		@Override
		public void run() {

			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			
			videoNewsService=new VideoNewsService();
			try {
				
				//videosList=videoNewsService.getLastNews();//讀取xml檔案
				videosList=videoNewsService.getJSONLastNews(); //讀取json
				Bundle bundle=new Bundle();
				if(null!=videosList && videosList.size()>0)
				{
					bundle.putString("result", "success");
					Message message=new Message();
					message.setData(bundle);
					handler.sendMessage(message);
				}
				else
				{
					bundle.putString("result", "fail");
				}
				
			} catch (Exception e) {
				e.printStackTrace();
			}
			
		}

	}
	
	/**
	 * 對返回的資料進行處理
	 */
	private Handler handler=new Handler(){
		
		public void handleMessage(Message msg)
		{
			String msStr=msg.getData().getString("result");
			if("success".equals(msStr))
			{
				//載入資料賦值
				initListView();
				//資料載入完成後結束進度條
				dialog.dismiss();
			}
			else{
				Toast.makeText(getApplicationContext(), "獲取資料失敗", 0).show();
			}
		}
	};

	protected void initListView() {

		List<HashMap<String, Object>> data=new ArrayList<HashMap<String,Object>>();
	    for(News news:videosList)
	    {
	    	HashMap<String, Object> item=new HashMap<String, Object>();
	    	item.put("id", news.getId());
	    	item.put("title", news.getTitle());
	    	item.put("timelength", getResources().getString(R.string.timelength)+
	    			news.getTimelength()+getResources().getString(R.string.fenzhong));
	    	data.add(item);		
	    }
		SimpleAdapter adapter=new SimpleAdapter(this, data, R.layout.items, 
				new String[]{"title","timelength"}, new int[]{R.id.title,R.id.timelength});
		
		listview.setAdapter(adapter);
	}
	
}