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我有 3 个选项卡,在我的一个选项卡中,我有一个ListView从 SQLite 数据库中获取项目的选项卡。

问题是当我切换到其他选项卡并返回此选项卡时,我ListView正在显示数据库项目 2 次,并且每次更改选项卡时它都会成倍增加。

这是我的标签显示代码ListView

public class MyActivity extends Fragment
{
   private ListView mListView;
   private DatabaseHandler db;
   List my = new ArrayList();
   MyListAdapter madapter ;

   //.....

   //...
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
   {
       MyItem i;
       LinearLayout mylayout = (LinearLayout) inflater.inflate(R.layout.my_layout, container, false);

       List<MyItem> l = db.getAllMyItem();

       while(!l.isEmpty() )
       {
           i = l.get(0);
           l.remove(0);
           my.add(new MyList(i.getName(),0));
       }

       mListView = (ListView) mylayout.findViewById(R.id.list);
       madapter = new MyListAdapter(getActivity(), my);

       mListView.setAdapter(madapter);
  }

我知道这是我的while循环,它一次又一次地从数据库中获取结果,但是我能做些什么来显示我从数据库中检索到的结果一次,即使在更改选项卡并返回此Fragment选项卡之后也是如此。

4

1 回答 1

1

You never empty your list, so add this before the while loop:

my.clear();

Also I would change the loop as follows because you don't need to remove items from the l list.

for (MyItem i : l) {
     my.add(new MyList(i.getName(),0));
}
于 2012-07-18T13:57:19.667 回答