Question

I implemented the lazy-loading images in my ListView.
I use a AsyncTask to download the image from the internet and bind it to the ImageView in the UIThread.

It’s working except that when I scroll the ListView vary fast, the downloaded images sometimes are binded into the wrong items in the list.

I guess the problem is from the reuse of convertView in the BaseAdapter.
Any ideas to solve it?

Many thanks.

EDIT:
I post the answer as following:

public void setBitmap(int position, Bitmap image) {
    View itemView = mListView.getChildAt(position - mListView.getFirstVisiblePosition());
    if (itemView != null) {
        ImageView itemImageView = (ImageView) itemView.findViewById(R.id.item_imageview);
        itemImageView.setImageBitmap(image);
    }
}

Answer 1

Create a function called void setBitmap(Bitmap bitmap, int position) or similar in your adapter. Let your AsyncTask call this method when a new bitmap is available. This method may then call notifyDataSetChanged() on the UI-Thread itself to ensure the views get refreshed. Holding references to views in an adapter (even by holding them in an AsyncTask) is dangerous!