public class TeamProjectActivity extends Activity {
 ListView listnews;
 ArrayList<News> newslist = new ArrayList<News>();
 NewsAdapter newsadapter;
 String newstitle;
 String newslink;
 Intent intent;
 
 /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        listnews = (ListView)findViewById(R.id.newsmainlist);    
        newsadapter = new NewsAdapter(TeamProjectActivity.this, R.layout.news, newslist);
        
        //더보기
        LinearLayout listfooter = (LinearLayout)View.inflate(TeamProjectActivity.this,R.layout.addlist,null);
        listnews.addFooterView(listfooter);
       
        //리스트에 어댑터 붙이기
      
        listnews.setAdapter(newsadapter);
        listnews.setOnItemClickListener(new OnItemClickListener(){
   public void onItemClick(AdapterView<?> arg0, View ve, int position,long arg3){
    if(position < newslist.size()){
     intent = new Intent(TeamProjectActivity.this,NewsActivity.class);
     intent.putExtra("newslink",newslist.get(position).newslink);
     startActivity(intent);
    }
   }
  }); 
    }
    public void buttonClick(View v){
     newsadapter.clear();
     String urlstr = "http://openapi.naver.com/search?key=3287fae5aaf30877863e7ccec198568a&" +
       "query=%EA%B5%AD%EB%82%B4%EC%8A%A4%ED%82%A4%EC%9E%A5&target=news&start=1&display=13";
     urlstr += URLEncoder.encode(urlstr);              
     try{
      URL url = new URL("urlstr);
      HttpURLConnection con = (HttpURLConnection)url.openConnection();
      
      if(con != null){
       if(con.getResponseCode()==HttpURLConnection.HTTP_OK){
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = factory.newDocumentBuilder();
        Document doc = dBuilder.parse(con.getInputStream());
        Element element = doc.getDocumentElement();
        NodeList items = element.getElementsByTagName("item"); 
        
        for(int i=0; i<items.getLength(); i++){
         Node item = items.item(i);
         NodeList chList = item.getChildNodes();
         
         newstitle = chList.item(0).getFirstChild().getNodeValue();
         newslink = chList.item(2).getFirstChild().getNodeValue();
         
         News news = new News(newstitle,newslink);
         newslist.add(news);
        }
        newsadapter.notifyDataSetChanged();
       }
       con.disconnect();
      }
     }catch(Exception e){
      Toast.makeText(TeamProjectActivity.this,"관련 뉴스 없음", Toast.LENGTH_SHORT).show();
     }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="5sp">
    <TextView
        android:id="@+id/newsmaintext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="관련 뉴스 검색"
        android:textSize="20sp"
        android:textStyle="bold|italic"
        android:layout_gravity="center|center_horizontal"
        android:textAppearance="?android:attr/textAppearanceLarge"/>
   
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal" >
     <Button
         android:id="@+id/newsmainsearch"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="검색 "
         android:textSize="20sp"
         android:textStyle="bold|italic"
         android:onClick="buttonClick"/>
    </LinearLayout>
    <ListView
        android:id="@+id/newsmainlist"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
    </ListView>
</LinearLayout> 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center_vertical"
  android:paddingTop="10dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="+ 더 보 기"
        android:textSize="20sp"
        android:textStyle="bold|italic"
        android:textColor="#FFFFFFFF"
        android:layout_gravity="center|center_horizontal"
        android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>

강득이님의 조언덕에 에러는 이제 잡혔습니다...그런데 또다른 문제가 실행시 검색  결과 더보기 버튼 기능이

실행이 안되네요..