Adatper.java

public class WorldPhotoStreamAdapter extends ArrayAdapter<Photo> {
    private LayoutInflater mInflater;
    private int photoWidth;
    private int photoHeight;
    private float scale;

    public WorldPhotoStreamAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
        mInflater = LayoutInflater.from(context);
        final int widthPx = context.getResources().getDisplayMetrics().widthPixels;
        scale = context.getResources().getDisplayMetrics().density;
        photoWidth = (int) (widthPx * 0.90f);
        photoHeight = photoWidth * 190 / 285;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        PhotoHolder holder;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.world_photo_stream_photo, null);
            holder = new PhotoHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (PhotoHolder) convertView.getTag();
        }

//        final SmartImageView image = (SmartImageView) convertView.findViewById(R.id.photo);
        holder.photo.setImageDrawable(getContext().getResources().getDrawable(R.drawable.empty_drawable));

        holder.photo.setLayoutParams(new LinearLayout.LayoutParams(photoWidth, photoHeight));
        Picasso.with(getContext())
                .load(getItem(position).getLinkW600h450())
                .into(holder.photo);

//        holder.photo.setImageUrl(getItem(position).getLinkW600h450());
        return convertView;
    }

    class PhotoHolder {
        public ImageView photo;

        public PhotoHolder(final View convertView) {
            photo = (ImageView) convertView.findViewById(R.id.photo);
        }
    }


}