Question

我有问题，我使用自定义ListView文本视图和图像查看，但当我滚动列表时，图像查看位置是更改。我不知道为什么。当第一次列表视图加载时，所有的东西都没问题，但是当我滚动时，图像视图位置就会变化。

please give me any suggestion for this.

/* this is my code */

public class CustomListAdapter extends ArrayAdapter<EntityList>
    {
        ArrayList<EntityList> entitiesList;
        LayoutInflater vi;
        int Resource;
        // ViewHolder holder;
        ImageView globalImgView;
        private Context context;

        public CustomListAdapter(Context context, int resource, ArrayList<EntityList> objects) {
            super(context, resource, objects);
            // this.context = context;
            vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            Resource = resource;
            entitiesList = objects;
        }

        @Override
        public View getView(final int position, View convertView, final ViewGroup parent) 
        {

            final  ViewHolder holder;
            View v = convertView;
            if (v == null) 
            {

                holder = new ViewHolder();
                v = vi.inflate(Resource, null);

                holder.tvName = (TextView) v.findViewById(R.id.tvName);     
                holder.tvimgview = (ImageView) v.findViewById(R.id.img_mobicon);

                String listName = entitiesList.get(position).getListName();

                Map<String, Bitmap> entityListImgName = HttpHandler.getInstance().getEnitityListImgMap();

                if(entityListImgName.containsKey(listName))
                {
                    Bitmap bmp = entityListImgName.get(listName);
                    holder.tvName.setText(listName);
                    holder.tvimgview.setImageBitmap(bmp);
                }


                v.setTag(holder);
            }       

             else 
                {
                    holder = (ViewHolder) v.getTag();
                }

            try
            {

                String listName = entitiesList.get(position).getListName();
                holder.tvName.setText(listName);        

            }
            catch(Exception ex)
            {
                System.out.println("Exception in CustomListAdapter class :" +ex);
            }

            return v;

        }


        static class ViewHolder 
        {

            public TextView tvName;
            public ImageView tvimgview;

        }       

    }

Answer 1

您的问题（可能）就是，v == null时，您正在为持有者提供价值。我参考你代码的这一部分

String listName = entitiesList.get(position).getListName();

Map<String, Bitmap> entityListImgName =     HttpHandler.getInstance().getEnitityListImgMap();

 if(entityListImgName.containsKey(listName))
 {
     Bitmap bmp = entityListImgName.get(listName);
     holder.tvName.setText(listName);
     holder.tvimgview.setImageBitmap(bmp);
 }

使用持有人时，您只需使用findViewById定义视图，或者在视图为空时插入将为所有行修复的值。

将该部分代码移至或复制到else区块，并像ImgView一样填充TextView，并在滚动时刷新您的回收视图。

Answer 2

           String listName = entitiesList.get(position).getListName();

            Map<String, Bitmap> entityListImgName = HttpHandler.getInstance().getEnitityListImgMap();

            if(entityListImgName.containsKey(listName))
            {
                Bitmap bmp = entityListImgName.get(listName);
                holder.tvName.setText(listName);
                holder.tvimgview.setImageBitmap(bmp);
            }

将此代码放在tvName.settext

之后

在我的应用程序中使用自定义列表视图与文本视图和图像视图。当我滚动时，imageview位置是变化的

2 个答案: