Question

当我滚动列表视图时，我的图像再次被加载。

这是我的适配器的getview方法。

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

        View itemView = convertView;
//      if(itemView==null){
//      final int x=position;
         Log.e("view Touched..","dsfgvdvgd");
         LayoutInflater inflator = ((Activity) context).getLayoutInflater();
//       LayoutInflater inflator = getLayoutInflater();
         itemView=inflator.inflate(resId, null);
//      }
         // name
        TextView name=(TextView) itemView.findViewById(R.id.userName);
        name.setText(usersSS.get(position).getUsername());


        TextView state=(TextView) itemView.findViewById(R.id.state);
        state.setText(usersSS.get(position).getState());



        //image
        ImageView img = (ImageView)itemView.findViewById(R.id.userimage);
        if(position==3){
        Log.e("image urls",usersSS.get(position).getUserthumb());
        }
        imageLoader.DisplayImage(usersSS.get(position).getUserthumb().replace(" ","%20"), img);

        // rating stars..

        int[] stars = {R.id.star1,R.id.star2,R.id.star3,R.id.star4,R.id.star5};
        if(!usersSS.get(position).getRating().equals(""))
        {
            int i=Integer.parseInt(usersSS.get(position).getRating());
            for(int j=0;j<i;j++)
            {
                ImageView imgv =(ImageView)itemView.findViewById(stars[j]);
                imgv.setBackgroundResource(R.drawable.star_on);
            }
        }


         Log.e("view","view");
        return itemView;

    }

我试着保留，if（convertView == null）{}然后，首先加载错误的图像，滚动后加载正确的图像。

请帮助我解决问题。

Answer 1

您可以使用picasso https://github.com/square/picasso或Universal Image Loader或Volley等库来进行图像加载。如果你使用这些库会太容易了。

我正在添加您可以与picasso一起使用的示例代码段。

首先我要说的是，请在getView中使用视图重用模式以及视图。

private static final int IMAGE_HEIGHT = 100;
private static final int IMAGE_WIDTH = 100;
public static class ViewHolder {
    public ImageView imageView;
    public TextView title;
    public TextView subTitle;

}

@Override
public Object getItem(int position) {
    return usersSS.get(position);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if(null == convertView) {
        convertView = inflater.inflate(R.layout.row_user_data, parent, false);  
        holder = new ViewHolder();
        holder.imageView = (ImageView) convertView.findViewById(R.id.userImage);
        holder.title = (TextView) convertView.findViewById(R.id.userName);
        holder.subTitle = (TextView) convertView.findViewById(R.id.state);          
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    User user = (User) getItem(position);
    holder.title.setText(user.getUserName());
    holder.subTitle.setText(user.getState);
    if (!TextUtils.isEmpty(user.getUserThumb())) {
        Picasso.with(context).load(user.getUserThumb)
                .error(R.drawable.dummy_image)
                .placeholder(R.drawable.dummyImage)
                .resize(IMAGE_HEIGHT, IMAGE_WIDTH).centerCrop()

                .into(holder.imageView);
    }
    return convertView;
}

在Android中滚动Listview时再次加载图像

1 个答案: