无法使用Picasso在GridView中显示图像（回调记录成功！）

Question

我想在GridView中显示来自URL的一些图像，我记录了一切，看起来它的工作原理（适配器已加载，Picasso Callback记录成功，URL正确等）但图像未显示。我不知道我做错了什么，我确信这对你来说很明显，但我盯着这几个小时没什么。

public class GridImageAdapter extends ArrayAdapter<MovieObj> {

    Context mContext;

    private static final String LOG_TAG = GridImageAdapter.class.getSimpleName();

    public GridImageAdapter(Activity context, List<MovieObj> movieObjects){

        super(context, 0, movieObjects);
        mContext = context;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        MovieObj currentMovie = getItem(position);

        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.grid_item_movie_poster, parent, false);

        }

        ImageView imageView = (ImageView) convertView.findViewById(R.id.grid_item_image);


        String posterId = currentMovie.getPosterId();

        String posterUrl = "http://image.tmdb.org/t/p/w185" + posterId;


        Picasso.with(mContext).load(posterUrl).placeholder(R.drawable.placeholder_ic).error(R.drawable.placeholder_ic).into(imageView, new Callback() {
            @Override
            public void onSuccess() {
                Log.v(LOG_TAG, "Image Loaded");
            }

            @Override
            public void onError() {
                Log.v(LOG_TAG, "Does not load");
            }
        });
        Log.v(LOG_TAG, posterUrl);
        return convertView;

    }
}

在片段中：