单击recyclerview项目时传递数据以显示在另一个活动中

Question

我有需要在回收站视图上显示的列表（小说列表），我正在为列表中的每个项目实现一个事件侦听器，每个小说列表都包含书籍。单击项目时，我想在单独的活动（DetailActivity）中显示书籍详细信息。

是否应该制作另一个适配器？请帮帮我

我坚持要添加嵌套数组列表，因为我有ItemAdapter，它有一个只接受小说列表且列表不包含任何书籍的构造函数。

    private ArrayList<Pemodelan_Item> dataNovelist() {

        ArrayList<Pemodelan_Item> list = new ArrayList<>();
        list.add(new Pemodelan_Item("Fiersa Besari.", "Bandung", R.drawable.fiersa, R.drawable.bandung_3, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Ahmad Fuadi", "Sumatra Barat", R.drawable.ahmad, R.drawable.sumbar_2, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Pidi Baiq", "Bandung", R.drawable.pidi, R.drawable.bandung_2, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Andrea Hirata", "Belitung", R.drawable.andrea, R.drawable.belitung, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Tere Liye", "Makasar", R.drawable.tereliye, R.drawable.makasar, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Dee Lestari", "Bandung", R.drawable.dee, R.drawable.bandung, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Boy Candra", "Sumatra Barat", R.drawable.boycandra, R.drawable.sumbar, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Pramoedya Ananta Toer", "Jakarta", R.drawable.toer, R.drawable.jkt, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("Erisca Febriani", "Lampung", R.drawable.erisca, R.drawable.lampung, R.string.long_desc_andrea));
        list.add(new Pemodelan_Item("habiburrahman el shirazy", "Semarang", R.drawable.habiburahman, R.drawable.semarang, R.string.long_desc_andrea));
        return list;
    }

package com.example.submission_novelist;


import android.content.Context;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

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

    private ArrayList<Pemodelan_Item> novelists;
    private Context mContext;
    private OnItemClickCallback onItemClickCallback;

    public void setOnItemClickCallback(OnItemClickCallback onItemClickCallback){
        this.onItemClickCallback = onItemClickCallback;
    }

    public ItemAdapter(Context context, ArrayList<Pemodelan_Item> novelistss) {
        this.novelists = novelistss;
        mContext = context;
    }


    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_layout, viewGroup, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(final ViewHolder viewHolder, int i) {
        Pemodelan_Item pemodelan_item = novelists.get(i);
        viewHolder.tvNovelist.setText(pemodelan_item.getmNovelist());
        viewHolder.tvAsal.setText(pemodelan_item.getmAsal());
        viewHolder.ivNovelist.setImageResource(pemodelan_item.getmImgNovelist());
        viewHolder.ivCardBack.setImageResource(pemodelan_item.getmImgCardBackground());
        viewHolder.cardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                Toast.makeText(viewHolder.cardView.getContext(), "saya" + novelists.get(viewHolder.getAdapterPosition()).getmNovelist(), Toast.LENGTH_SHORT).show();
           onItemClickCallback.onItemClicked(novelists.get(viewHolder.getAdapterPosition()));
            }
        });
    }

    @Override
    public int getItemCount() {
        if (novelists != null) {
            return novelists.size();
        } else {
            return 0;
        }
    }


    public class ViewHolder extends RecyclerView.ViewHolder {
        public View v;
        public TextView tvNovelist;
        public TextView tvAsal;
        public ImageView ivNovelist;
        public ImageView ivCardBack;
        public CardView cardView;

        public ViewHolder(View itemView) {
            super(itemView);
            this.v = itemView;
            tvNovelist = v.findViewById(R.id.novelist_text_view);
            tvAsal = v.findViewById(R.id.asal_text_view);
            ivNovelist = v.findViewById(R.id.novelist_image_view);
            ivCardBack = v.findViewById(R.id.cardViewBackground);
            cardView = v.findViewById(R.id.myCardView);

        }
    }

    public interface OnItemClickCallback{
        void onItemClicked(Pemodelan_Item pemodelan_item);
    }
}

Answer 1

你可以做的就是关注

1.更改模型类

Novelist.java

public class Novelist {

   private String writerName;
   private int writerImage;
   private String city;
   private int cityImage;
   private String description;
   private ArrayList<Book> books;

   public Novelist(String writerName, int writerImage, String city, int cityImage, String description, ArrayList<Book> books){

        this.writerName = writerName;
        this.writerImage = writerImage;
        this.city = city;
        this.cityImage = cityImage;
        this.description = description;
        this.books = books;
   }
   // property setters, getters here    
}

Book.java

public class Book{
     private String bookTitle;
     private int bookImage;
     private String description;
     private double price;

     public Book(String bookTitle, int bookImage, String description, double price){
          this.bookTitle = bookTitle;
          this.bookImage = bookImage;
          this.description = description;
          this.price = price;
     }
     // property setters, getters here
}

2。如果您有很多项目，最好在 DetailActivity 中有一个回收器视图（有利于性能），因此您需要另一个适配器类（例如：BookItemAdapter）

3。通过意图传递书籍

MainActivity.java

@Override
public onItemClickCallback(Novelist novelist){

    Intent intent = new Intent(getBaseContext(), DetailActivity.class);
    intent.putExtra("books", novelist.books);
    startActivity(intent);
}

DetailActivity.java

private ArrayList<Book> books;
private BookItemAdapter bookItemAdapter;

@Override
public void onCreate(Bundle savedInstanceState){
    ...
    books = getIntent("books");
    bookItemAdapter = BookItemAdapter(books)
    ...
}

---

改进

在onCreateViewHolder 中设置您的点击监听器作为最佳做法。 (Read here)

public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i){

     View view = LayoutInflater.from(viewGroup.getContext());

     view.setOnClickListener(new View.OnClickListener(){

     @Override
     public void onClick(View v){
         onItemOnClickCallback.onItemClicked(novelists.get(holder.getAdapterPosition()));
     }
  });

     ViewHolder holder =  ViewHolder(view);
}

Answer 2

user158 有一个很好的答案。

简而言之，是的，您需要创建一个新的图书适配器来处理您从当前 Novelist 项目中获得的图书列表。因此，单击您的项目后，启动您的 DetailsActivity 并使用 Intent 传递书籍列表。然后创建一个新的 Books Recycler 和一个新的 Books Adapter 并传入图书列表。

希望你能明白！