在列表视图滚动期间，首先显示错误的图像，然后显示正确的图像

I am using listview with images in my application.But whenever I scroll the list the wrong images are shown first and then the correct images are displaying.I dont know why it is happening like this.I think already loaded images are displaying until the position is set. Here is my adapter class,please help me where I am going wrong

  public class MySimpleArrayAdapter extends ArrayAdapter<String> {
    private Activity context;
    ArrayList<String> namear,msgar,idar,profimage,postimage,commentsnum,objectid,urlString;
  ImageLoader imageLoader;
  Bitmap[] bitdata;

  public MySimpleArrayAdapter(Activity c,int i,ArrayList<String> postpic, ArrayList<String> names,ArrayList<String> msg,ArrayList<String> id,ArrayList<String> proimg,Bitmap[] bit,ArrayList<String> comment,ArrayList<String> objid,ArrayList<String> web) {

      super(c, i, names);
    Log.e("adapter","adap");
    this.context = c;
    this.namear = names;
    this.msgar = msg;
    this.idar = id;
    this.profimage=proimg;
    this.postimage=postpic;
    this.bitdata=bit;
    this.commentsnum=comment;
    this.objectid=objid;
    this.urlString=web;
   this.imageLoader = new ImageLoader(context);
  }

  @Override
  public View getView(final int position, View convertView, ViewGroup parent) {
  View rowView=convertView;
  ViewHolder holder = new ViewHolder();
      if(convertView == null) {
  LayoutInflater inflator = getLayoutInflater();
  rowView = inflator.inflate(R.layout.walldata, null);

  holder.name1 = (TextView) rowView.findViewById(R.id.name);
  holder.message1 = (TextView) rowView.findViewById(R.id.msg);
  holder.profimg= (ImageView) rowView.findViewById(R.id.profile_pic);
  holder.postimg= (ImageView) rowView.findViewById(R.id.picpost);
  holder.comments = (TextView) rowView.findViewById(R.id.comment);
  rowView.setTag(holder);
     Log.e("user",idar.get(position));
      }
      else
         {
          holder = (ViewHolder) rowView.getTag();
         }
    Log.e("adapter","adap");
    holder.name1.setText(namear.get(position));
    if(msgar.get(position)!=""){
        holder.message1.setText(msgar.get(position));

    }
    else
    {
        holder.message1.setVisibility(View.GONE);
    }
    if(!postimage.get(position).equals(""))
    {try{
         imageLoader.DisplayImage(postimage.get(position).replace(" ", "%20"), holder.postimg) ;

    }
    catch(Exception e){
        e.printStackTrace();
    }
    }
    else
    {
         holder.postimg.setVisibility(View.GONE);
    }
    try{
      imageLoader.DisplayImage(profimage.get(position).replace(" ", "%20"), holder.profimg) ;
    }
    catch(Exception e){
       e.printStackTrace();
    }

    holder.comments.setText(commentsnum.get(position)+"\t"+"Comments");
    holder.comments.setOnClickListener(new OnClickListener() {


        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent myintent=new Intent(Wall.this,Comments.class);
            myintent.putExtra("name", namear.get(position));
            myintent.putExtra("profimg", profimage.get(position));
            myintent.putExtra("message", msgar.get(position));
            myintent.putExtra("postpic", postimage.get(position));
            myintent.putExtra("objectid", objectid.get(position));
            myintent.putExtra("commentsnum",commentsnum.get(position));
            myintent.putExtra("webservice", urlString.get(position));
            startActivity(myintent);

        }
    });

    return rowView;
  }

}
public class ViewHolder{
    TextView name1, message1,comments;
    ImageView profimg,postimg;
}

确保在 getView 方法中尽早将 ImageView 中的图像设置为 null。由于 ListView 重复使用列表项，因此旧列表项将一直显示，直到设置新列表项为止。