在 recyclerview 中通过毕加索库获取图像

Question

我正在创建回收器视图，它通过改造从 Web 服务器获取数据，当我想通过 picasso 获取图像时出现问题，我收到错误消息

                                             java.lang.IllegalArgumentException: Context must not be null.

我不知道为什么 context 为 null 我在 onBindViewHolder 中添加了 picasso

我的适配器

public class myAdapter extends RecyclerView.Adapter<myAdapter.ViewHolder> {
     private List<Listitem>listitems;
    private Context context;

    public myAdapter(List<Listitem> listitems, Context context) {
        this.listitems = listitems;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view, parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
     Listitem listitem = listitems.get(position);

        holder.textTitile.setText(listitem.getTitel());
        holder.textDesc.setText(listitem.getDesc());
        Picasso.with(context)
                .load(listitem.getImageurl())
                .placeholder(R.color.colorAccent)
                .into(holder.movieThumbnail);


    }

    @Override
    public int getItemCount() {
        return listitems.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        public TextView textTitile ;
        public TextView textDesc;
public ImageView movieThumbnail;


        public ViewHolder(View itemView) {
            super(itemView);
            textTitile=(TextView) itemView.findViewById(R.id.Titell);
            textDesc=(TextView)itemView.findViewById(R.id.desc);
            movieThumbnail = (ImageView) itemView.findViewById(R.id.movie_thumbnail);

        }
    }
}

Answer 1

您的上下文为空，您可以使用视图上下文的任何方式也例如：holder.itemView.getContext()

您可以检查您发送的不是空值，或者您可以使用 blow 方法。

所以你可以改成

Picasso.with(holder.itemView.getContext())
                .load(listitem.getImageurl())
                .placeholder(R.color.colorAccent)
                .into(holder.movieThumbnail);

在 recyclerview 中通过毕加索库获取图像

feching image by picasso library in recycler view

java

android

retrofit

picasso