버튼클릭시 리스트추가하고싶은데

장바구니처럼요

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

.

.

ArrayList<ItemEx> list3 = new ArrayList<ItemEx>();
  list3.add(new ItemEx(R.drawable.chocolate_muffin, "더블 초콜릿 머핀",
    "부드럽고 촉촉한 진한 초콜릿 풍미의 머핀입니다", "1000원"));

ListView listv3 = (ListView) findViewById(R.id.listview3);
  listv3.setAdapter(new CustomDataAdapter(this, list3, R.layout.customrow));

list4 = new ArrayList<ItemEx>();
  
  ListView listv4 = (ListView) findViewById(R.id.listview4);
  listv4.setAdapter(new CustomDataAdapter(this, list4, R.layout.customrow));

.

.

mTabHost.addTab(mTabHost.newTabSpec("tab_test3")
          .setIndicator("상품")
          .setContent(R.id.listview3));

mTabHost.addTab(mTabHost.newTabSpec("tab_test4")
          .setIndicator("장바구니")
          .setContent(R.id.listview4));

.

.

}

public void ListAdd(ArrayList<ItemEx> ex){
  //Log.e("1","ListAdd"+a+","+b+","+c+","+d);
  list4 = ex;
  Log.e("1",list4.get(0).m_strText+","+list4.get(0).m_strText2+","+list4.get(0).m_strText3);
 }

로그찍어보면

Log.e("1",list4.get(0).m_strText+","+list4.get(0).m_strText2+","+list4.get(0).m_strText3);  여기까지잘나오는데 리스트 추가가안됍니다.

보여지질 않네요 해결방법좀알려주세요

버튼

btn.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    String s1 = edt1.getText().toString();
    if (s1.equals("")) {
     Toast.makeText(m_con,"수량을 입력해주세요.", Toast.LENGTH_SHORT)
       .show();
    } else {
     Toast.makeText(
       m_con,
       m_list.get(pos).m_strText + " 주문 신청! "
         + m_list.get(pos).m_strText3 + s1 + "개",
       Toast.LENGTH_SHORT).show();
     setdialog();//다이얼로그창 가져오기
     Log.e("1",m_list.get(pos).m_strText +
       m_list.get(pos).m_strText3 + s1);
     ArrayList<ItemEx> aa = new ArrayList<ItemEx>();
     //aa.remove(0);
     aa.add(new ItemEx(m_list.get(pos).m_src, m_list.get(pos).m_strText, m_list.get(pos).m_strText3, s1));
     drink dd = new drink();
     dd.ListAdd(aa);

    }
   }