wrong images are displaying first and then correct images are displaying during scrolling of listview

问题

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;
}

回答1:

Make sure to set the image in your ImageView to null as early as possible in your getView method. Since the ListView is re-using list items, the old one will be displayed until a new one has been set.

来源：https://stackoverflow.com/questions/13394724/wrong-images-are-displaying-first-and-then-correct-images-are-displaying-during