android - RecyclerView 适配器显示错误的图像

Question

我有一个看起来像这样的 RecyclerView 适配器:

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {

    private static Context context;
    private List<Message> mDataset;

    public RecyclerAdapter(Context context, List<Message> myDataset) {
        this.context = context;
        this.mDataset = myDataset;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener, View.OnClickListener {
        public TextView title;
        public LinearLayout placeholder;

        public ViewHolder(View view) {
            super(view);
            view.setOnCreateContextMenuListener(this);

            title = (TextView) view.findViewById(R.id.title);
            placeholder = (LinearLayout) view.findViewById(R.id.placeholder);
        }
    }

    @Override
    public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.message_layout, parent, false);
        ViewHolder vh = new ViewHolder((LinearLayout) view);

        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Message item = mDataset.get(position);

        holder.title.setText(item.getTitle());

        int numImages = item.getImages().size();

        if (numImages > 0) {
            View test = LayoutInflater.from(holder.placeholder.getContext()).inflate(R.layout.images, holder.placeholder, false);
            ImageView image = (ImageView) test.findViewById(R.id.image);
            Glide.with(context)
                .load("http://www.website.com/test.png")
                .fitCenter()
                .into(image);
            holder.placeholder.addView(test);
        }
    }

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

}

但是，RecyclerView 中的某些项目在不应该显示的情况下显示图像。我怎样才能阻止这种情况发生？

我在 onBindViewHolder() 中检查了 if (numImages > 0) {，但这仍然没有阻止它显示不应该有图像的项目的图像.

Answer 1

你应该设置imageView.setImageDrawable (null) 在 onBindViewHolder() 中使用 glide 设置图像之前。

将 image drawable 设置为 null 解决了这个问题。

希望对您有所帮助!