Question

当我在列表视图中滚动时，我的图像被洗牌或更改.......当我向下滚动并继续改变自己时，图像得到洗牌我有一个自定义列表视图适配器，当我向下/向上滚动时列表，图像被洗牌，我不知道该怎么做。

public class MySimpleArrayAdapter extends BaseAdapter {
     private static ArrayList<String> searchArrayList;
     SQLiteDatabase database;


     private LayoutInflater mInflater;
     ArrayList<String> list = new ArrayList<String>();
     ArrayList<String> listid = new ArrayList<String>();

     public MySimpleArrayAdapter(Context context, ArrayList<String> results) {
      searchArrayList = results;
      mInflater = LayoutInflater.from(context);
      database = context.openOrCreateDatabase("ORCL", context.MODE_PRIVATE, null);
     }

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

     public Object getItem(int position) {
      return searchArrayList.get(position);
     }

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

     public View getView(int position, View convertView, ViewGroup parent) {
      ViewHolder holder;
      if (convertView == null) {
       convertView = mInflater.inflate(R.layout.homelistvwlyout, null);
       holder = new ViewHolder();
       holder.txtName = (TextView) convertView.findViewById(R.id.textView1);
       holder.iv = (ImageView) convertView.findViewById(R.id.imageView1);
       holder.txtvwid = (TextView) convertView.findViewById(R.id.textView2);
       convertView.setTag(holder);
      } else {
       holder = (ViewHolder) convertView.getTag();
      }

        holder.txtName.setText(searchArrayList.get(position));
//      Cursor cursorQuote = database.rawQuery(
//              "SELECT * FROM  Qotestable where Notification_Status =1",
//              null);
        Cursor cursorQuote = database.query("Qotestable", null,
                "Notification_Status" + "=1", null, null, null, "Quote_ID"
                        + "DESC");



        if (cursorQuote.moveToFirst()) {
            do {

                list.add(cursorQuote.getString(3));
                listid.add(cursorQuote.getString(0));
            } while (cursorQuote.moveToNext());
        }
        //Collections.sort(list, Collections.reverseOrder()); 
        String s = list.get(position);
        if (s.contentEquals("1")) {
            holder.iv.setImageResource(R.drawable.onestaron);

        }else  if (s.contentEquals("2")) {
            holder.iv.setImageResource(R.drawable.twostaron);
        }else  if (s.contentEquals("3")) {
            holder.iv.setImageResource(R.drawable.threestaron);
        }
        holder.txtvwid.setText(listid.get(position));

      return convertView;
     }
 static class ViewHolder {
  TextView txtName,txtvwid;
  TextView txtCityState;
  ImageView iv;
  TextView txtPhone;
 }
}

Answer 1

您忘记在"Quote_ID"和"DESC"之间留出空格，以便您的收藏无序。将"Quote_ID" + "DESC"更改为"Quote_ID DESC"。

每次调用getView（）时都会查询数据库。除了浪费性能之外，list和listid会变得无限大。至少你应该清除它们。如果您不想动态更新内容，则应将此代码移出getView()。

<强>更新对于给定的cursorQuote.getString(3)，position是否不等于“1”，“2”或“3”？在这种情况下，您根本不会分配图像，它仍然保留在convertView中。

Answer 2

只是一个猜测！ ...尝试使用...如果listview尺寸不大......要保留insertion和order中的activity adapter

Activity/fragment和adapter

而不是 ::

 ArrayList<String> list = new ArrayList<String>();

使用 ::

 LinkedList<String> list = new LinkedList<String>();

Answer 3

请检查你的listview高度.....它不应该是wrap_content .....它应该是match_parent。如下，

<ListView
       android:layout_width="match_parent"
       android:layout_height="match_parent" /> ///////HEIGHT SHOULD BE MATCH_PARENT////

当我在列表视图中滚动时，ListView -images会被洗牌或更改

3 个答案: