Question

我一直关注this tutorial，而我遇到的问题是它无法解析nameText和countText的符号。我已尽可能地遵循教程并尝试重建代码但它遇到错误并给我一个编译失败的消息。我不太清楚如何解决它。这是迄今为止的代码：

package com.example.android.sqliteappexamplegrocerylist;

import android.content.Context;
import android.database.Cursor;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import org.w3c.dom.Text;

public class GroceryAdapter extends RecyclerView.Adapter {

    private Context mContext;
    private Cursor mCursor;

    public GroceryAdapter(Context context, Cursor cursor) {
        mContext = context;
        mCursor = cursor;
    }

    public class GroceryViewHolder extends RecyclerView.ViewHolder {
        public TextView nameText;
        public TextView countText;

        public GroceryViewHolder(View itemView) {
            super(itemView);

            nameText = itemView.findViewById(R.id.textview_name_item);
            countText = itemView.findViewById(R.id.textview_amount_item);
        }
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View view = inflater.inflate(R.layout.grocery_item, parent, false);
        return new GroceryViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        if(!mCursor.move(position)) {
            return;
        }

        String name = mCursor.getString(mCursor.getColumnIndex(GroceryContract.GroceryEntry.COLUMN_NAME));
        int amount = mCursor.getInt(mCursor.getColumnIndex(GroceryContract.GroceryEntry.COLUMN_AMOUNT));

        holder.nameText.setText(name);
        holder.countText.setText(String.valueOf(amount));
    }

    @Override
    public int getItemCount() {
        return mCursor.getCount();
    }

    public void swapCursor(Cursor newCursor) {
        if (mCursor != null) {
            mCursor.close();
        }

        mCursor = newCursor;

        if(newCursor != null) {
            notifyDataSetChanged();
        }
    }
}

Answer 1

在类声明中它应该是

public class GroceryAdapter extends RecyclerView.Adapter<GroceryAdapter.GroceryViewHolder>

持有人无法解析适配器

1 个答案: