再改一个Android新闻客户端

[QQ863017854]

在logcat中能够输出网页信息，但是在手机上一片空白，不知道是为什么.求指点 具体源码在这 链接：http://pan.baidu.com/s/1dExZJXJ 密码：za8r

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.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.jikexueyuan.news.adapter.NewsAdapter;
import com.jikexueyuan.news.model.News;
import com.jikexueyuan.news.utils.HttpUtils;

public class MainActivity extends Activity implements OnItemClickListener{
	
	private ListView lvNews;
	private NewsAdapter adapter;
	private List<News> newsList;
	

	public static final String GET_NEWS_URL = "http://www.zjhaining.com/api/get_recent_posts?post_type=news&page=1&count=20&include=id,title,excerpt,date,comment_count,custom_fields";
	
	private Handler getNewsHandler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			String jsonData = (String) msg.obj;
			System.out.println(jsonData);
			try {
				JSONArray jsonArray = new JSONArray(jsonData);
				for (int i=0;i<jsonArray.length();i++){
					JSONObject object = jsonArray.getJSONObject(i);
					String id = object.getString("id");
					String title = object.getString("title");
					String excerpt = object.getString("excerpt");
					String date = object.getString("date");
					String custom_fields = object.getString("custom_fields");
					String thumb_value = object.getString("thumb_value");
					
					System.out.println("title = " +title);
					System.out.println("thumb_value = " +thumb_value);
					newsList.add(new News(id, title, excerpt, date,custom_fields, thumb_value ));
								
				
				}
				adapter.notifyDataSetChanged();
			} catch (Exception e) {
				e.printStackTrace();
			}
		};
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		lvNews = (ListView) findViewById(R.id.lvNews);
		newsList = new ArrayList<News>();
		adapter = new NewsAdapter(this, newsList);
		
		lvNews.setAdapter(adapter);
		lvNews.setOnItemClickListener(this);
			
		HttpUtils.getNewsJSON(GET_NEWS_URL, getNewsHandler);
	}

	@Override
	public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
		News news = newsList.get(position);
		Intent intent = new Intent(this, BrowseNewsActivity.class);
		intent.putExtra("Excerpt", news.getExcerpt());
		startActivity(intent);
	}
}

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;

import com.jikexueyuan.news.R;
import com.jikexueyuan.news.model.News;
import com.jikexueyuan.news.utils.HttpUtils;

public class NewsAdapter extends BaseAdapter {
	
	private Context context;
	private List<News> newsList;
	
	public NewsAdapter(Context context, List<News> newsList){
		this.context = context;
		this.newsList = newsList;
	}

	@Override
	public int getCount() {
		return newsList.size();
	}

	@Override
	public News getItem(int position) {
		return newsList.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		if (convertView == null){
			convertView = LayoutInflater.from(context).inflate(R.layout.news_item, null);
		}
		TextView Title = (TextView) convertView.findViewById(R.id.Title);
		TextView excerpt = (TextView) convertView.findViewById(R.id.excerpt);
		TextView date = (TextView) convertView.findViewById(R.id.date);
		ImageView thumb_value = (ImageView) convertView.findViewById(R.id.thumb_value);
		
		News news = newsList.get(position);
		Title.setText(news.getTitle());
		excerpt.setText(news.getExcerpt());
		date.setText(news.getDate());
		
		String custom_fields = news.getCustom_fields();
		HttpUtils.setPicBitmap(thumb_value,null);
		
		return convertView;
	}
}

public class News {
	
	private String title;
	private String excerpt;
	private String date;
	private String id;
	private String thumb_value;
	private String custom_fields;


	public News(String title, String excerpt, String date, String id, String custom_fields,String thumb_value ){
		setTitle(title);
		setExcerpt(excerpt);
		setDate(date);
		setId(id);
		setCustom_fields(custom_fields);
		setThumb_value(thumb_value);}
		
	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}
	public String getExcerpt() {
		return excerpt;
	}

	public void setExcerpt(String excerpt) {
		this.excerpt = excerpt;
	}

	public String getDate() {
		return date;
	}

	public void setDate(String date) {
		this.date = date;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getThumb_value() {
		return thumb_value;
	}

	public void setThumb_value(String thumb_value) {
		this.thumb_value = thumb_value;
	}

	public String getCustom_fields() {
		return custom_fields;
	}

	public void setCustom_fields(String custom_fields) {
		this.custom_fields = custom_fields;
	}

		
}