如何为适配器中的项目设置监听器？ [关闭]答案

【问题标题】：how to set listener for items in adapter? [closed]如何为适配器中的项目设置监听器？ [关闭]
【发布时间】：2020-08-01 10:11:45
【问题描述】：

当方法点击时，适配器上有一个 lyser 以更改某些内容。我不知道我应该在 onClickListener 的正文上写什么。和 listener.onClick();需求（查看视图、结构卡数据、int 位置）提前谢谢你，我很抱歉我的英语不好

银行卡适配器：

package ir.acopal.android.test.adapter;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.Random;

import ir.acopal.android.test.R;
import ir.acopal.android.test.classes.StructCard;
import ir.acopal.android.test.interfaces.setOnclickListenerBankCard;
import ir.acopal.android.test.view.CustomBankCard;

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


    private ArrayList<StructCard> accountCards;
    private Context context;
    setOnclickListenerBankCard listener;
    Boolean a = true;
    View view;


    public BankCardAdapter(ArrayList<StructCard> accountCards, Context context) {
        this.accountCards = accountCards;
        this.context = context;
    }

    public void setListener(setOnclickListenerBankCard listener) {
        this.listener = listener;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        View view = LayoutInflater.from(context).inflate(R.layout.test, parent, false);
        return new ViewHolder(view);
    }

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

        StructCard cur = accountCards.get(position);
        if (a) {
            int firstCard = Color.parseColor("#BDBAAB");
            holder.card.setCardBackgroundColor(firstCard);
            a = false;
        } else {
            Random rnd = new Random();
            int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
            holder.card.setCardBackgroundColor(color);
        }
        holder.card.setCardNumber(cur.getAccountCardNumbers());
        holder.card.setCustomCardExpireDateText(cur.getAccountExpirationDate());
        holder.card.setNewCardText("");
//        holder.txtExpirationDate.setText(number.getAccountExpirationDate());


    }

    @Override
    public int getItemCount() {
        return accountCards.size();
    }


    public class ViewHolder extends RecyclerView.ViewHolder {
        CustomBankCard card;


        public ViewHolder(@NonNull final View itemView) {
            super(itemView);
            findViews(itemView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {


                }
            });
        }

        private void findViews(View itemView) {
            card = itemView.findViewById(R.id.itemBankCard_cbcCard);
        }
    }
}

结构卡：

package ir.acopal.android.test.classes;

public class StructCard {
    private String accountCardNumbers;
    private String accountExpirationDate;
    private boolean empty;


    public String getAccountCardNumbers() {
        return accountCardNumbers;
    }
    public void setAccountCardNumbers(String accountCardNumbers) {
        this.accountCardNumbers = accountCardNumbers;
    }



    public String getAccountExpirationDate() {
        return accountExpirationDate;
    }
    public void setAccountExpirationDate(String accountExpirationDate) {
        this.accountExpirationDate = accountExpirationDate;
    }


    public boolean isEmpty() {
        return empty;
    }
    public void setEmpty(boolean empty) {
        this.empty = empty;
    }
}

听众：

package ir.acopal.android.test.interfaces;

import android.view.View;

import ir.acopal.android.test.classes.StructCard;

public interface setOnclickListenerBankCard {
    void onClick(View view, StructCard data, int posotion);


}

【问题讨论】：

标签： java android android-recyclerview adapter

【解决方案1】：

像这样更改您的onBindViewHolder。

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

    StructCard cur = accountCards.get(position);
    if (a) {
        int firstCard = Color.parseColor("#BDBAAB");
        holder.card.setCardBackgroundColor(firstCard);
        a = false;
    } else {
        Random rnd = new Random();
        int color = Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256));
        holder.card.setCardBackgroundColor(color);
    }
    holder.card.setCardNumber(cur.getAccountCardNumbers());
    holder.card.setCustomCardExpireDateText(cur.getAccountExpirationDate());
    holder.card.setNewCardText("");

    /*Add these lines for item click. After Click on item 
    call listener.onClick and pass requires parameters. */

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            listener.onClick(holder.itemView, cur, position)
        }
    });
}

【讨论】：

【解决方案2】：

在您的 onCreateViewHolder 上添加以下代码。您将通过使用适配器位置获得 structCard 值

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

 View view = LayoutInflater.from(context).inflate(R.layout.test, parent, false);
 holder.itemView.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
         Log.d(TAG, "position = " + holder.getAdapterPosition());
         StructCard structCard = accountCards[holder.getAdapterPosition()]
     }
 });
return new ViewHolder(view);
}

【讨论】：