Using Picasso library with ListView

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There are 2 things you need to change:
1) History.icon should be the String url of the icon, not a Picasso object. You can also use a File, Uri, or int, but a String url is probably what you want.

2) Modify your Adapter's getView() method to load the icon using Picasso (see the last line before getView() returns the convertView):

public class HistoryAdapter extends ArrayAdapter<History> {

    Context context;
    int layoutResId;
    History data[] = null;

    public HistoryAdapter(Context context, int layoutResId, History[] data) {
        super(context, layoutResId, data);
        this.layoutResId = layoutResId;
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        HistoryHolder holder = null;

        if(convertView == null)
        {
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            convertView = inflater.inflate(layoutResId, parent, false);

            holder = new HistoryHolder();
            holder.imageIcon = (ImageView)convertView.findViewById(R.id.icon);
            holder.textTitle = (TextView)convertView.findViewById(R.id.gameType);
            holder.textScore = (TextView)convertView.findViewById(R.id.score);

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

        History history = data[position];
        holder.textScore.setText(history.score);
        holder.textTitle.setText(history.gametype);
        Picasso.with(this.context).load(history.icon).into(holder.imageIcon)


        return convertView;
    }

    static class HistoryHolder
    {
        ImageView imageIcon;
        TextView textTitle;
        TextView textScore;
    }
}

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