android - 我可以在另一个类/Activity 中使用 ItemCount() 方法值吗？

Question

recyclerView 的 ItemCount 方法是:

@Override
public int getItemCount() {
    Log.e("Notification Size is " ,String.valueOf(slideshowModelList.size()));

    return slideshowModelList.size();
}

LogOutput 是:8

这是我完整的适配器类代码:

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

Context context;
List<SlideshowModel> slideshowModelList;

public SlideShowAdapter(Context context, List<SlideshowModel> slideshowModelList) {
    this.context = context;
    this.slideshowModelList = slideshowModelList;
}

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

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    SlideshowModel slideshowModel = slideshowModelList.get(position);
    Picasso.get().load(slideshowModel.getImage()).fit().centerCrop().placeholder(R.drawable.placeholders).into(holder.image);
    holder.title.setText(slideshowModel.getTitle());
    holder.description.setText(slideshowModel.getDesc());
    holder.date.setText(slideshowModel.getDate());

    if (getItemCount() !=1){
        holder.notif_icon.setVisibility(View.VISIBLE);
    }
    else{
        holder.notif_icon.setVisibility(View.GONE);
    }
}

@Override
public int getItemCount() {
    Log.e("Notification Size is " ,String.valueOf(slideshowModelList.size()));

    return slideshowModelList.size();
}

class ViewHolder extends RecyclerView.ViewHolder{
    ImageView image,notif_icon;
    TextView title,description,date;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);

        image= itemView.findViewById(R.id.imagecontent);
        title = itemView.findViewById(R.id.title);
        description = itemView.findViewById(R.id.desc);
        date= itemView.findViewById(R.id.date);
        notif_icon= itemView.findViewById(R.id.notif_icon);

    }
}
}

我可以在另一个与 recyclerView 的父类无关的类/Activity 中使用这个 getItemCount() 值吗？

EDIT : In my MainActivity , the value received is :

E/Notification Size is: 0

Whereas In my RecyclerView Activity i am getting value as : E/Notification Size is: 2

Answer 1

试试这个

SlideShowAdapter  adpater=new SlideShowAdapter(context,list);
int count=adapter.getItemCount();