public class Call extends Activity {
 ArrayList<MyItem> arItem;

 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.list);

  arItem = new ArrayList<MyItem>();
  MyItem mi;
  mi = new MyItem(R.drawable.icon, "삼성 노트북");
  arItem.add(mi);
  mi = new MyItem(R.drawable.icon, "LG 세탁기");
  arItem.add(mi);
  mi = new MyItem(R.drawable.icon, "대우 마티즈");
  arItem.add(mi);

  MyListAdapter MyAdapter = new MyListAdapter(this, R.layout.main, arItem);

  ListView MyList;
  MyList = (ListView) findViewById(R.id.list);
  MyList.setAdapter(MyAdapter);

 }
}

// 리스트 뷰에 출력할 항목
class MyItem {
 MyItem(int aIcon, String aName) {
  Icon = aIcon;
  Name = aName;
 }

 int Icon;
 String Name;
}

// 어댑터 클래스
class MyListAdapter extends BaseAdapter {
 Context maincon;
 LayoutInflater Inflater;
 ArrayList<MyItem> arSrc;
 int layout;

 public MyListAdapter(Context context, int alayout, ArrayList<MyItem> aarSrc) {
  maincon = context;
  Inflater = (LayoutInflater)context.getSystemService(
    Context.LAYOUT_INFLATER_SERVICE);
  arSrc = aarSrc;
  layout = alayout;
 }

 public int getCount() {
  return arSrc.size();
 }

 public String getItem(int position) {
  return arSrc.get(position).Name;
 }

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

 // 각 항목의 뷰 생성
 public View getView(int position, View convertView, ViewGroup parent) {
  final int pos = position;
  if (convertView == null) {
   convertView = Inflater.inflate(layout, parent, false);
  }
  ImageView img = (ImageView)convertView.findViewById(R.id.img);
  img.setImageResource(arSrc.get(position).Icon);

  TextView txt = (TextView)convertView.findViewById(R.id.text);
  txt.setText(arSrc.get(position).Name);

  Button btn = (Button)convertView.findViewById(R.id.btn);
  btn.setOnClickListener(new Button.OnClickListener() {
   public void onClick(View v) {
    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:1234567"));
    startActivity(intent);

the method startactivity intent is undefined for the type new view.onclicklistener

이런에러가 생깁니다....