Question

我的listview适配器有点问题。我正在为我的应用程序使用延迟加载列表视图，我从数据库填充。问题是我必须从2个不同的表中获取数据。这是我正在使用的一些代码：

    String sqlQuery = "SELECT categoryId, collectionId, objectId, title FROM cards WHERE collectionId="+collId;
    Cursor cursor = userDbHelper.executeSQLQuery(sqlQuery);

    String sqlQuery2 = "SELECT objectId, title FROM categories";
    Cursor cursorCat = userDbHelper.executeSQLQuery(sqlQuery2);
    cursorCat.moveToFirst();
    if(cursor.getCount()==0 && cursorCat.getCount()==0){
        Log.i("No Thumbnails","There are no Cards or Thumbnails.");
        cursor.close();
        cursorCat.close();
    } else if(cursor.getCount()>0 && cursorCat.getCount()>0){
        for(cursor.move(0); cursor.moveToNext(); cursor.isAfterLast()){

            title = cursor.getString(cursor.getColumnIndex("title"));
            Log.v("Title","Title : "+title);

            categoryId = Integer.parseInt(cursor.getString(cursor.getColumnIndex("categoryId")));
            Log.v("Category Id","Category Id : "+categoryId);
            names.add(title);

        }
        for(cursorCat.move(0); cursorCat.moveToNext(); cursorCat.isAfterLast()){

            title = cursorCat.getString(cursorCat.getColumnIndex("title"));
            Log.v("Title","Title : "+title);
            categoryId = Integer.parseInt(cursorCat.getString(cursorCat.getColumnIndex("objectId")));
            Log.v("Category Id","Category Id : "+categoryId);

            categories.add(title);

        }
    }

所以我必须从categoryId检查cards并从title表中获取该类别的categories。但问题是我有120个不同的名称，当我在列表视图上加载它们时，应用程序崩溃，因为类别的数量是11.所以这是适配器的代码：

public View getView(int position, View convertView, ViewGroup parent) {
    View vi=convertView;
    ViewHolder holder;
    if(convertView==null){
        vi = inflater.inflate(R.layout.item, null);
        holder=new ViewHolder();
        holder.name=(TextView)vi.findViewById(R.id.name);
        holder.info=(TextView)vi.findViewById(R.id.info);
        holder.image=(ImageView)vi.findViewById(R.id.image);
        vi.setTag(holder);
        Log.v("Position","Position : "+position);
    }
    else
        holder=(ViewHolder)vi.getTag();
            holder.name.setText(name.get(position));
            holder.info.setText(info.get(position));

            //Here I must do a black magic and get the images if user had 'em.

            holder.image.setImageBitmap(b);

            //holder.image.setTag(data[position]);
            //imageLoader.DisplayImage(data[position], activity, holder.image);

            // Black magic over.
    return vi;
}

应用程序崩溃在该行：holder.info.setText(info.get(position));，但有以下异常：

10-14 15:55:42.378: ERROR/AndroidRuntime(16468): java.lang.IndexOutOfBoundsException: Invalid index 11, size is 11

那么如何在适配器中设置类别的大小？有什么建议吗？

Android listview适配器问题

0 个答案: