Question

I cannot seem to figure out why my ImageView does not get populated in a GridView which has a Custom ArrayAdapter class attached to it.

I was trying to populate the images based on an AsyncTask call, but I decided to just try hard coding a drawable into the ImageView within the layout being used, and it still does not show anything.

Is there anything that stands out with my implementation?

I am not receiving any errors, and one thing I noticed is when I try to debug it does not hit my breakpoint within getView().

ADAPTER CLASS


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LAYOUT

public class MovieAdapter extends ArrayAdapter<Movie> {

    private LayoutInflater mInflater;

    public MovieAdapter(Context context, List<Movie> movies) {
        super(context, 0, movies);
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder vh;
        Movie movie = getItem(position);
        if(convertView == null){
            convertView = mInflater.inflate(R.layout.movie_item, parent, false);
            vh = new ViewHolder();
            vh.ivPoster = (ImageView) convertView.findViewById(R.id.ivMoviePoster);
            convertView.setTag(vh);
        } else {
            vh = (ViewHolder) convertView.getTag();
        }

        vh.ivPoster.setImageDrawable(getContext().getResources().getDrawable(R.drawable.ant_man));

        //Picasso.with(getContext()).load(movie.getFull_poster_path()).into(vh.ivPoster);
        return convertView;
    }

    @Override
    public int getCount() {
        return super.getCount();
    }

    @Override
    public int getPosition(Movie item) {
        return super.getPosition(item);
    }

    private class ViewHolder {
        private ImageView ivPoster;

    }
}

IMPLEMENTATION

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent" android:orientation="vertical">

    <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ant_man"
            android:id="@+id/ivMoviePoster"/>
</LinearLayout>

Answer 1

这里的要点是电影适配器中的列表始终为空。
您使用空列表初始化电影适配器然后在getMovies的{{1}}中，您分配finalMovieList = movieList;然后notifyDatasetChanged，但是适配器仍然为空，因为finalMoviewList现在指向另一个引用
试试这个：

finalMovieList.clear();
if (movieList != null) {
  finalMovieList.addAll(movieList);
} 
movieAdapter.notifyDataSetChanged();

希望这有帮助。

Images not showing up in GridView

1 个答案: