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[英]Unable to call method in Adapter(onBindViewHolder) from ViewHolder (RecycleView)
[英]Unable to call method in Adapter from ViewHolder (RecyclerView)
當用戶單擊時,我試圖從RecyclerView中刪除一個項目。 但是,即使適配器中的delete方法是公共的,當嘗試從MyViewHolder中的onClick調用“刪除”方法時,也會收到錯誤“無法解析方法delete(int)”。
是什么賦予了? 它是公開的,所以我為什么不能打電話呢?
GroceryItemAdapter
public class GroceryItemAdapter extends RecyclerView.Adapter<MyViewHolder> {
private LayoutInflater inflater;
private Context context;
List<MetaData> data = Collections.emptyList();
public GroceryItemAdapter(Context context, List<MetaData> data) {
this.context = context;
inflater = LayoutInflater.from(context);
this.data = data;
}
public void delete(int position) {
data.remove(position);
notifyItemRemoved(position);
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.grocery_item_row, parent, false);
MyViewHolder holder = new MyViewHolder(view);
Log.i("GroceryHero", "onCreateViewHolder called");
return holder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
MetaData current = data.get(position);
holder.title.setText(current.title);
holder.icon.setImageResource(current.iconid);
Log.i("GroceryHero","onBindViewHolder called " + position);
}
@Override
public int getItemCount() {
return data.size();
}
}
MyViewHolder:
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView title;
ImageView icon;
public MyViewHolder(View itemView) {
super(itemView);
Log.i("GroceryHero", "MyViewHolder called");
title = (TextView) itemView.findViewById(R.id.grocery_text);
icon = (ImageView) itemView.findViewById(R.id.grocery_icon);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Item clicked at " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
delete(getAdapterPosition()); // ERROR: Cannot resolve method
}
}
您正在嘗試從視圖持有者類調用delete
。 但是delete
是適配器類的方法。 您可以將適配器的實例傳遞給onCreateViewHolder
的視圖持有者,並將其存儲為私有字段。
GroceryItemAdapter mAdapter;
public MyViewHolder(View itemView, GroceryItemAdapter adapter) {
mAdapter = adapter;
...
}
// now you can call
mAdapter.delete(getAdapterPosition());
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