求助，一運(yùn)行程序就崩潰。。底下是源代碼，大家?guī)蛶兔Α！?/h1>

package?com.tired.itemlist;

import?java.io.BufferedReader;
import?java.io.IOException;
import?java.io.InputStream;
import?java.io.InputStreamReader;
import?java.io.UnsupportedEncodingException;
import?java.net.MalformedURLException;
import?java.util.ArrayList;
import?java.util.List;

import?org.json.JSONArray;
import?org.json.JSONException;
import?org.json.JSONObject;

import?android.app.Activity;
import?android.os.AsyncTask;
import?android.os.Bundle;
import?android.util.Log;
import?android.widget.ListView;

public?class?MainActivity?extends?Activity?{

	private?ListView?mlistView;
	private?static?String?URL?=?"http://idcbgp.cn/api/teacher?type=4&num=30";

	@Override
	protected?void?onCreate(Bundle?savedInstanceState)?{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mlistView?=?(ListView)?findViewById(R.id.lv_main);
		new?NewsAsyncTask().execute(URL);
	}

	private?List<NewsBean>?getJsonData(String?url)?{
?????	List<NewsBean>?newsBeanList?=?new?ArrayList<NewsBean>();??
			try?{
				String	jsonString?=?readStream(new?java.net.URL(url).openStream());
				JSONObject?jsonObject;
				?NewsBean?newsBean;
				?try?{
					jsonObject?=?new?JSONObject(jsonString);
					JSONArray?jsonArray?=jsonObject.getJSONArray("data");
					for?(int?i?=?0;?i?<?jsonArray.length();?i++)?{
						jsonObject?=?jsonArray.getJSONObject(i);
						newsBean?=new?NewsBean();
						newsBean.newsIconUrl=jsonObject.getString("picSmall");
						newsBean.newsTitle=jsonObject.getString("name");
						newsBean.newsContent=jsonObject.getString("description");
					????newsBeanList.add(newsBean);
					}
				}?catch?(JSONException?e)?{
					//?TODO?Auto-generated?catch?block
					e.printStackTrace();
				}
			}?catch?(MalformedURLException?e)?{
				//?TODO?Auto-generated?catch?block
				e.printStackTrace();
			}?catch?(IOException?e)?{
				//?TODO?Auto-generated?catch?block
				e.printStackTrace();
			}
			return?newsBeanList;	???
????}

	private?String?readStream(InputStream?is)?{
		InputStreamReader?isr;
		String?result2?=?"";
		try?{
			String?line?=?"";
			isr?=?new?InputStreamReader(is,?"utf-8");
			BufferedReader?br?=?new?BufferedReader(isr);
			try?{
				while?((line?=?br.readLine())?!=?null)?{
					result2?+=?line;
					Log.d("main",?result2);
				}
			}?catch?(IOException?e)?{
				e.printStackTrace();
			}
		}?catch?(UnsupportedEncodingException?e)?{
			e.printStackTrace();
		}
		return?result2;
	}

	class?NewsAsyncTask?extends?AsyncTask<String,?Void,?List<NewsBean>>?{
		@Override
		protected?List<NewsBean>?doInBackground(String...?arg0)?{
			return?getJsonData(arg0[0]);
		}

		@Override
		protected?void?onPostExecute(List<NewsBean>?result)?{
			super.onPostExecute(result);
			NewsAdapter?adapter?=?new?NewsAdapter(MainActivity.this,?result);
			mlistView.setAdapter(adapter);
		}
	}

}







package?com.tired.itemlist;

import?java.util.List;

import?android.content.Context;
import?android.view.LayoutInflater;
import?android.view.View;
import?android.view.ViewGroup;
import?android.widget.BaseAdapter;
import?android.widget.ImageView;
import?android.widget.TextView;

public?class?NewsAdapter?extends?BaseAdapter?{

	private?List<NewsBean>?mList;
	private?LayoutInflater?mInflater;
	
	public?NewsAdapter(Context?context,List<NewsBean>?data){
		mInflater?=?LayoutInflater.from(context);
		mList?=data;
	}
	@Override
	public?int?getCount()?{
		//?TODO?Auto-generated?method?stub
		return?mList.size();
	}

	@Override
	public?Object?getItem(int?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?mList.get(arg0);
	}

	@Override
	public?long?getItemId(int?arg0)?{
		//?TODO?Auto-generated?method?stub
		return?arg0;
	}

	@Override
	public?View?getView(int?arg0,?View?arg1,?ViewGroup?arg2)?{
		//?TODO?Auto-generated?method?stub
		ViewHolder?viewHolder;
		if(arg1?==null){
			viewHolder?=new?ViewHolder();
			arg1?=mInflater.inflate(R.layout.item_layout,null);
			viewHolder.ivIcon?=(ImageView)?arg1.findViewById(R.id.icon);
			viewHolder.tvTitle?=(TextView)?arg1.findViewById(R.id.tv_title);
			viewHolder.tvContent?=?(TextView)?arg1.findViewById(R.id.tv_content);
			arg1.setTag(viewHolder);
		}else{
			viewHolder?=(ViewHolder)?arg1.getTag();
		}
		viewHolder.ivIcon.setImageResource(R.drawable.ic_launcher);
		viewHolder.tvTitle.setText(mList.get(arg0).newsTitle);
		viewHolder.tvContent.setText(mList.get(arg0).newsContent);
		return?arg1;
	}
	
	class?ViewHolder{
		public?TextView?tvTitle,tvContent;
		public?ImageView?ivIcon;
	}

}





package?com.tired.itemlist;

public?class?NewsBean?{
	public?String?newsIconUrl;
	public?String?newsTitle;
	public?String?newsContent;
}