[Android] 안드로이드 스튜디오 RecyclerView item 버튼

https://pasongsong.tistory.com/201?category=1090989 

[Android Studio] 안드로이드 스튜디오 JAVA RecyclerView Button 클릭 이벤트

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• item position을 가져와야하기 때문에 다른 방식으로 바꾸기로 결정!

    interface OnItemClickListener {
        void onCameraClick(View v, int positon); //카메라
        void onGalleryClick(View v, int positon); // 사진첩
        void onDeleteClick(View v, int positon); // 삭제
    }

    private OnItemClickListener mListener = null;
    //리스너 객체 참조를 어댑터에 전달 메서드
    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mListener = listener;
    }

• mainactivity에서 Click 을 위한 interface, 함수 만들기

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ViewHolder에서 on Click 함수 만들기

변수보다 밑에 설정하기 그렇지 않으면 NULL error 발생

            food_camera.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
                    int position = getAbsoluteAdapterPosition();
                    if (position != RecyclerView.NO_POSITION) {
                        if (mListener != null) {
                            mListener.onCameraClick(v, position);
                        }
//                Log.w("TEST: ", "test camera" );
//                Intent in_camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//                context.startActivity(in_camera);
                    }
                }
            });

            food_del.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    Log.w("TEST: ", "test del" );
                    int position = getAbsoluteAdapterPosition();
                    if (position != RecyclerView.NO_POSITION) {
                        if (mListener != null) {
                            mListener.onDeleteClick(v, position);
                        }
                    }
                }
            });

---

Mainactivity에서 click 함수 만들기

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //recycler View 연결
        RecyclerView one_food = (RecyclerView) findViewById(R.id.Recyc_food);
        DayMealAdapter one_food_Adapter = new DayMealAdapter(meal_items, this);
        one_food.setAdapter(one_food_Adapter);
        one_food.setLayoutManager(new LinearLayoutManager(this));

        meal_items.add(new One_food(R.drawable.food_1,"아침","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16"));
        one_food_Adapter.setFoodList(meal_items);

        //recyclerview click
        one_food_Adapter.setOnItemClickListener(new DayMealAdapter.OnItemClickListener() {
            @Override
            public void onCameraClick(View v, int positon) {
                Intent x = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                startActivityForResult(x, 101);
            }

            @Override
            public void onGalleryClick(View v, int positon) {

            }

            @Override
            public void onDeleteClick(View v, int positon) {
                meal_items.remove(positon);
                one_food_Adapter.notifyItemRemoved(positon);
            }
        });
    }

---

Adapter 전체 코드

package com.example.k_food_application;


import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.activity.result.ActivityResult;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;
import androidx.recyclerview.widget.RecyclerView;

import org.apache.http.params.CoreConnectionPNames;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;




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

    private ArrayList<One_food> food_list;
    private Context context;
    private Uri photoUri;
    private File photoFile;


    interface OnItemClickListener {
        void onCameraClick(View v, int positon); //카메라
        void onGalleryClick(View v, int positon); // 사진첩
        void onDeleteClick(View v, int positon); // 삭제
    }

    private OnItemClickListener mListener = null;
    //리스너 객체 참조를 어댑터에 전달 메서드
    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mListener = listener;
    }


    public DayMealAdapter(ArrayList<One_food> food_list, Context context) {
        this.food_list = food_list;
        this.context = context;
    }


    //---------------

    @NonNull
    @Override
    public DayMealAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_item, parent, false);
        return new ViewHolder(view);
    }



    @Override
    public void onBindViewHolder(@NonNull DayMealAdapter.ViewHolder holder, int position) {
        holder.onBind(food_list.get(position));

//        holder.food_camera.setOnClickListener(new View.OnClickListener(){
//            @Override
//            public void onClick(View v){
//                Log.w("TEST: ", "test camera" );
//                Intent in_camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//                context.startActivity(in_camera);
//            }
//        });
//
//        holder.food_del.setOnClickListener(new View.OnClickListener(){
//            @Override
//            public void onClick(View v){
//                Log.w("TEST: ", "test camera" );
//                Intent in_camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//                context.startActivity(in_camera);
//            }
//        });


    }

    public void setFoodList(ArrayList<One_food> list){
        this.food_list = list;
        notifyDataSetChanged();
    }

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

    class ViewHolder extends RecyclerView.ViewHolder {
        ImageView food_img;
        TextView food_day;
        TextView food_na;
        TextView food_dan;
        TextView food_dang;
        TextView food_ma;
        TextView food_zin;
        TextView food_ene;
        TextView food_p;
        TextView food_wei;
        TextView food_fat;
        TextView food_fe;
        TextView food_k;
        TextView food_ca;
        TextView food_chol;
        TextView food_tan;
        TextView food_trans;

        Button food_camera;
        Button food_del;


        ViewHolder(@NonNull View itemView) {
            super(itemView) ;
            // 뷰 객체에 대한 참조. (hold strong reference)
            food_img = (ImageView) itemView.findViewById(R.id.IV_food);
            food_day = (TextView) itemView.findViewById(R.id.text_day);
            food_na = (TextView) itemView.findViewById(R.id.text_na);
            food_dan = (TextView) itemView.findViewById(R.id.text_dan);
            food_dang = (TextView) itemView.findViewById(R.id.text_dang);
            food_ma = (TextView) itemView.findViewById(R.id.text_ma);
            food_zin = (TextView) itemView.findViewById(R.id.text_zin);
            food_ene = (TextView) itemView.findViewById(R.id.text_ene);
            food_p = (TextView) itemView.findViewById(R.id.text_p);
            food_wei = (TextView) itemView.findViewById(R.id.text_wei);
            food_fat = (TextView) itemView.findViewById(R.id.text_fat);
            food_fe = (TextView) itemView.findViewById(R.id.text_fe);
            food_k = (TextView) itemView.findViewById(R.id.text_k);
            food_ca = (TextView) itemView.findViewById(R.id.text_ca);
            food_chol = (TextView) itemView.findViewById(R.id.text_chol);
            food_tan = (TextView) itemView.findViewById(R.id.text_tan);
            food_trans = (TextView) itemView.findViewById(R.id.text_trans);

            food_camera = (Button) itemView.findViewById(R.id.btn_camera);
            food_del = (Button) itemView.findViewById(R.id.btn_del);



            food_camera.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v) {
                    int position = getAbsoluteAdapterPosition();
                    if (position != RecyclerView.NO_POSITION) {
                        if (mListener != null) {
                            mListener.onCameraClick(v, position);
                        }
//                Log.w("TEST: ", "test camera" );
//                Intent in_camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//                context.startActivity(in_camera);
                    }
                }
            });

            food_del.setOnClickListener(new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    Log.w("TEST: ", "test del" );
                    int position = getAbsoluteAdapterPosition();
                    if (position != RecyclerView.NO_POSITION) {
                        if (mListener != null) {
                            mListener.onDeleteClick(v, position);
                        }
                    }
                }
            });
        }

        void onBind(One_food item){
            food_img.setImageResource(item.getFood_resourceId());
            food_day.setText(item.getDay());
            food_na.setText(item.getNa());
            food_dan.setText(item.getDan());
            food_dang.setText(item.getDang());
            food_ma.setText(item.getMa());
            food_zin.setText(item.getZin());
            food_ene.setText(item.getEne());
            food_p.setText(item.getP());
            food_wei.setText(item.getWei());
            food_fat.setText(item.getFat());
            food_fe.setText(item.getFe());
            food_k.setText(item.getK());
            food_ca.setText(item.getCa());
            food_chol.setText(item.getChol());
            food_tan.setText(item.getTan());
            food_trans.setText(item.getTrans());

        }
    }

}