无法用类中的onBindViewHolder实现扩展RecyclerView.Adapter

Question

我刚在一周内加入了这个论坛，我在安卓系统中遇到了RecyclerView.Adapter的问题。

通过遵循示例代码和文档，我尝试自己构建一个自定义适配器类，它停留在从它的超类RecyclerView.Adapter继承的方法中。虽然我编写了一个继承了viewholder的内部类，就像示例代码一样，但是当涉及到onBindViewHolder()时，它仍然存在错误。

下面是我内部类的代码：

public static class ViewHolder extends RecyclerView.ViewHolder{
   private final TextView tvTitle,tvDate,tvTime;
   public ViewHolder(View v){
        super(v);

        Log.d(TAG,"building view holder");

        tvTitle=v.findViewById(R.id.item_tvTitle);
        tvDate=v.findViewById(R.id.item_tvDate);
        tvTime=v.findViewById(R.id.item_tvTime);

        //set onclick listener to start another activity
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
       });
   }

   public TextView getTvTitle(){return tvTitle;}
   public TextView getTvDate(){return tvDate;}
   public TextView getTvTime(){return tvTime;}
}

下面是适配器的代码：

public class EventAdapter extends RecyclerView.Adapter {
    private static final String TAG="EventAdapter";
    private Event[] dataset;

    public static class ViewHolder extends RecyclerView.ViewHolder{
        private final TextView tvTitle,tvDate,tvTime;
        public ViewHolder(View v){
            super(v);

            Log.d(TAG,"building view holder");

            tvTitle=v.findViewById(R.id.item_tvTitle);
            tvDate=v.findViewById(R.id.item_tvDate);
            tvTime=v.findViewById(R.id.item_tvTime);

            //set onclick listener to start another activity
            v.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                }
            });
        }

        public TextView getTvTitle(){return tvTitle;}
        public TextView getTvDate(){return tvDate;}
        public TextView getTvTime(){return tvTime;}
    }

    public EventAdapter(List<Event> dataset){
        Log.d(TAG,"Constructor, converting list to array");
        this.dataset=dataset.toArray(new Event[dataset.size()]);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup container,int viewType){
        Log.d(TAG,"onCreateViewHolder");
        View v= LayoutInflater.from(container.getContext()).inflate(R.layout.item_event,container,false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position){
        Log.d(TAG,"onBindViewHolder");

        viewHolder.getTvTitle().setText("Title: "+dataset[position].getTitle());
        viewHolder.getTvDate().setText("Date: "+dataset[position].getDate());
        viewHolder.getTvTime().setText("Time: "+dataset[position].getTime());
    }

    @Override
    public int getItemCount(){return dataset.length;}
}

下面是它所显示的错误：

1. class 'EventAdapter'(which is my class inherited from the adapter) must either declared as abstract or implements abstract method onBindViewHolder(VH,int) in 'Adapter'
2. method(means the onBindViewHolder) does not override or implement a method from a supertype

谢谢你解决我的问题

Answer 1

因此，要成功编译，请更改

public class EventAdapter extends RecyclerView.Adapter<EventAdapter.ViewHolder>

和

 public void onBindViewHolder(EventAdapter.ViewHolder viewHolder, final int position)

Answer 2

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

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return null;
}

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

}

@Override
public int getItemCount() {
    return 0;
}

public static class ViewHolder extends RecyclerView.ViewHolder {
    public ViewHolder(@NonNull View itemView) {
        super(itemView);
    }
}

}