listviewitem滚动后刷新不见

Question

我有一个listView女巫显示新闻列表.when用户reada新闻项，出现后应得到gray.so在listadapter我检查是否有新闻是否reaced和如果它是阅读布局1将负载加载到一个项目，如果不是布局2则将负载加载到该项目。问题是：litview显示完美，但当我滚动到加载更多的项目和回到listview灰色listview项目与布局2的第一个加载项目的前10名获得更改布局1！这里是我的listadapter代码：问题是什么？

package ir.whc.news.adapter; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Color; 
import android.graphics.PorterDuff; 
import android.graphics.PorterDuffColorFilter; 
import android.support.annotation.LayoutRes; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.LinearLayout; 
import android.widget.TextView; 

import com.android.volley.toolbox.ImageLoader; 
import com.android.volley.toolbox.NetworkImageView; 
import com.orm.query.Condition; 
import com.orm.query.Select; 

import java.util.List; 

import ir.whc.news.R; 
import ir.whc.news.classes.MyApplication; 
import ir.whc.news.classes.Utility; 
import ir.whc.news.model.NewsItem; 
import ir.whc.news.model.SeenItem; 

/** 
* Created by marzieh on 18/03/2016. 
*/ 
public class NewsListAdapter extends BaseAdapter { 


    private Activity activity; 
    private LayoutInflater inflater; 
    private List<NewsItem> newsItems; 
    private int node_id; 
    private int subdomain_id; 
    Context context; 

    ImageLoader imageLoader = MyApplication.getInstance().getImageLoader(true); 

    public NewsListAdapter(Activity activity, List<NewsItem> newsItems, int subdomain_id, int node_id) { 
     this.activity = activity; 
     this.newsItems = newsItems; 
     this.node_id = node_id; 
     this.subdomain_id = subdomain_id; 
     inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     this.context = activity; 

    } 


    @Override 
    public int getCount() { 
     return newsItems.size(); 
    } 

    @Override 
    public NewsItem getItem(int position) { 
     return newsItems.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return newsItems.get(position).get_id(); 
    } 

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

     Log.d("position is " ,String.valueOf(position)); 

     final NewsItem item = newsItems.get(position); 
     if (inflater == null) 
      inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     if (convertView == null) 
      if (IsReed(item.get_id(),item.get_termId())) 
       convertView = inflater.inflate(R.layout.item_news_iread, null); 
      else 
       convertView = inflater.inflate(R.layout.item_news, null); 

     if (imageLoader == null) 
      imageLoader = MyApplication.getInstance().getImageLoader(true); 


     LinearLayout parrentLayout = (LinearLayout) convertView.findViewById(R.id.parentL); 
     TextView titleHolder = (TextView) convertView.findViewById(R.id.text_title); 
     TextView summeryHolder = (TextView) convertView.findViewById(R.id.text_summery); 
     TextView dateHolder = (TextView) convertView.findViewById(R.id.text_date); 
     NetworkImageView thumbpicHolder = (NetworkImageView) convertView 
       .findViewById(R.id.image_news_thumb); 
     final ImageView image_bookmark = (ImageView) convertView.findViewById(R.id.image_bookmark); 



     titleHolder.setText(item.get_title()); 
     summeryHolder.setText(item.get_summary()); 
     imageLoader.get(item.get_imgPath(), imageLoader.getImageListener(thumbpicHolder, 
       R.drawable.ic_launcher, 
       android.R.drawable.ic_dialog_alert)); 

     thumbpicHolder.setImageUrl(item.get_imgPath(), imageLoader); 
     thumbpicHolder.setVisibility(item.get_imgPath().trim().isEmpty() ? View.GONE : View.VISIBLE); 
     dateHolder.setText(Utility.GetFormattedDteTime(newsItems.get(position).get_datePublish())); 


     //checkBookmark 
     if (Select.from(NewsItem.class).where(Condition.prop("_id").eq(item.get_id())).list().size() > 0) 
      image_bookmark.setImageResource(R.drawable.ic_bookmarkfill); 
     else 
      image_bookmark.setImageResource(R.drawable.ic_bookmark_normal); 
     //add or delet from bookmark 
     image_bookmark.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Utility.Insert_bookmark("_id", item, image_bookmark, NewsItem.class); 
      } 
     }); 



     /* Animation animation = AnimationUtils.loadAnimation(context, R.anim.slide_down); 
     convertView.startAnimation(animation); 

*/ 
     return convertView; 
    } 

    private boolean IsReed(int _id,int _term_id) { 
     ////check is reed 

     if (SeenItem.find(SeenItem.class, "_id = ? and _nodeid = ? and _termid = ? and _domainid= ? ", String.valueOf(_id), 
       String.valueOf(node_id), 
       String.valueOf(_term_id), 
       String.valueOf(subdomain_id)).size() > 0) { 

      return true; 
     } else 
      return false; 

    } 

} 

Answer 1

在Android中Adpater遵循的意见再利用的概念。意思是如果在屏幕上显示5个视图，则您滚动列表，然后第1个视图将被循环到第6个视图。这就是为什么你得到这种类型的结果。 所以只要在代码中删除以下条件即可。

if (convertView == null) 

或者你可以使用BaseAdapter有两个方法，如getViewType(int position) ，并通过这个你可以找出要呈现哪种类型的两个角度类型视图的概念。

Answer 2

你适配器它没有正确地写入和你打气筒& convertView不正确初始化下面的代码的getView是初始化你的项目的正确方法：

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

     final ViewHolder holder; 


     if (convertView == null) { 

      convertView = mLayoutInflater.inflate(R.layout.row_list_base, parent,false); 
      holder = new ViewHolder(); 
      holder.videoImage = (ImageView)convertView.findViewById(R.id.image_video_preload); 
      holder.title = (TextView) convertView.findViewById(R.id.text_video_title); 
      holder.subtitle = (TextView) convertView.findViewById(R.id.text_video_subtitle); 

      convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     final ShortVideoModel item = getItem(position); 

     if (item != null) { 

      ImageLoaderHelper.displayImage(mContext, holder.videoImage, item.getImageUri()); 

      if (!TextUtils.isEmpty(item.getTitle())) { 
       holder.title.setText(item.getTitle()); 
      } 


      //... initialize rest of things 
     } 


     return convertView; 
    }