Weird behavior in ListView GetView() method position

I've a custom adapter for my ListView where I send to it a List, and if the position is in the list then the imageview (that is in the custom row) change its src to another.. Here is the GetView method:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolde开发者_如何学Pythonr holder;

    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.start_row, null); // line
                                                                    // 47
        holder = new ViewHolder();

        holder.tv_SuraName = (TextView) convertView.findViewById(R.id.Start_Name);

        holder.tv_SuraName.setTypeface(Font);
        holder.tv_PageNumber = (TextView) convertView.findViewById(R.id.Start_Numbering);
        holder.im_Audio = (ImageView) convertView.findViewById(R.id.Start_ImageView);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.tv_SuraName.setText(SuraList_SuraNamesCode[position]);
    holder.tv_PageNumber.setText(Integer.toString(PageNumber[position]));
    holder.im_Audio.setOnClickListener(new imageViewClickListener(position));
    if (TilawaAvailable.contains(position))
        holder.im_Audio.setImageResource(R.drawable.quran_list_audioavailable);
    return convertView;
}

I send a List with 1 position.If I scroll the ListView slowly, this works good and only 1 imageview gets changed as it should be. But if I scroll fast, other imagesviews that are close to the correct position also gets changed!

Can anyone tell me why?

You don't ever set the imageResource to something else if position isn't contained in your list. When the view with the custom image leaves the screen it is probably getting placed at a lower position in the list and getting reused.

Try changing this:

if (TilawaAvailable.contains(position))
        holder.im_Audio.setImageResource(R.drawable.quran_list_audioavailable);

To this:

if (TilawaAvailable.contains(position))
        holder.im_Audio.setImageResource(R.drawable.quran_list_audioavailable);
else
        holder.im_audio.setImageResource(r.drawable.SOME_THING_ELSE);