[Android Studio] 안드로이드 스튜디오 JAVA Recycler View class 만들어서 추가하기

https://pasongsong.tistory.com/164?category=1090989 

[Android Studio] 안드로이드 스튜디오 class 생성

---

Recycler view item에 만들 class를 만들고 다음과 같이 작업 진행

저번에 만들었던 Recycler view Adapter에 추가한 변수를 넣을 것임

---

recycler view item

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/IV_food"
        android:layout_width="0dp"
        android:layout_height="420dp"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:srcCompat="@tools:sample/avatars" />

    <Button
        android:id="@+id/btn_camera"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:text="카메라"
        app:layout_constraintBottom_toTopOf="@+id/constraintLayout5"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/IV_food" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/constraintLayout5"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/constraintLayout"
            android:layout_width="0dp"
            android:layout_height="64dp"
            app:layout_constraintBottom_toTopOf="@+id/constraintLayout2"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <TextView
                android:id="@+id/text_1"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="식사"
                app:layout_constraintBottom_toTopOf="@+id/text_day"
                app:layout_constraintEnd_toStartOf="@id/text_2"
                app:layout_constraintHorizontal_bias="1.0"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.511" />

            <TextView
                android:id="@+id/text_2"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="나트륨(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_na"
                app:layout_constraintEnd_toStartOf="@+id/text_3"
                app:layout_constraintStart_toEndOf="@+id/text_1"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_3"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="단백질(g)"
                app:layout_constraintBottom_toTopOf="@+id/text_dan"
                app:layout_constraintEnd_toStartOf="@+id/text_4"
                app:layout_constraintStart_toEndOf="@+id/text_2"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_4"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="당류(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_dang"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_3"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_day"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_na"
                app:layout_constraintHorizontal_bias="1.0"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/text_1" />

            <TextView
                android:id="@+id/text_na"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_dan"
                app:layout_constraintStart_toEndOf="@+id/text_day"
                app:layout_constraintTop_toBottomOf="@+id/text_2" />

            <TextView
                android:id="@+id/text_dan"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_dang"
                app:layout_constraintStart_toEndOf="@+id/text_na"
                app:layout_constraintTop_toBottomOf="@+id/text_3" />

            <TextView
                android:id="@+id/text_dang"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_dan"
                app:layout_constraintTop_toBottomOf="@+id/text_4" />
        </androidx.constraintlayout.widget.ConstraintLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/constraintLayout2"
            android:layout_width="0dp"
            android:layout_height="64dp"
            app:layout_constraintBottom_toTopOf="@+id/constraintLayout3"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.461"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/constraintLayout">

            <TextView
                android:id="@+id/text_5"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="마그네슘(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_ma"
                app:layout_constraintEnd_toStartOf="@+id/text_6"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_6"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="아연(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_zin"
                app:layout_constraintEnd_toStartOf="@+id/text_7"
                app:layout_constraintStart_toEndOf="@+id/text_5"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_7"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="에너지(kcal)"
                app:layout_constraintBottom_toTopOf="@+id/text_ene"
                app:layout_constraintEnd_toStartOf="@+id/text_8"
                app:layout_constraintStart_toEndOf="@+id/text_6"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_8"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="인(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_p"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_7"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_ma"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_zin"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/text_5" />

            <TextView
                android:id="@+id/text_zin"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_ene"
                app:layout_constraintStart_toEndOf="@+id/text_ma"
                app:layout_constraintTop_toBottomOf="@+id/text_6" />

            <TextView
                android:id="@+id/text_ene"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_p"
                app:layout_constraintStart_toEndOf="@+id/text_zin"
                app:layout_constraintTop_toBottomOf="@+id/text_7" />

            <TextView
                android:id="@+id/text_p"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_ene"
                app:layout_constraintTop_toBottomOf="@+id/text_8" />
        </androidx.constraintlayout.widget.ConstraintLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/constraintLayout3"
            android:layout_width="0dp"
            android:layout_height="64dp"
            app:layout_constraintBottom_toTopOf="@+id/constraintLayout4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/constraintLayout2">

            <TextView
                android:id="@+id/text_9"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="중량(g)"
                app:layout_constraintBottom_toTopOf="@+id/text_wei"
                app:layout_constraintEnd_toStartOf="@+id/text_10"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_10"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="지방(g)"
                app:layout_constraintBottom_toTopOf="@+id/text_fat"
                app:layout_constraintEnd_toStartOf="@+id/text_11"
                app:layout_constraintStart_toEndOf="@+id/text_9"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_11"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="철(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_fe"
                app:layout_constraintEnd_toStartOf="@+id/text_12"
                app:layout_constraintStart_toEndOf="@+id/text_10"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_12"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="칼륨(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_k"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_11"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_wei"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_fat"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/text_9" />

            <TextView
                android:id="@+id/text_fat"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_fe"
                app:layout_constraintStart_toEndOf="@+id/text_wei"
                app:layout_constraintTop_toBottomOf="@+id/text_10" />

            <TextView
                android:id="@+id/text_fe"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_k"
                app:layout_constraintStart_toEndOf="@+id/text_fat"
                app:layout_constraintTop_toBottomOf="@+id/text_11" />

            <TextView
                android:id="@+id/text_k"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_fe"
                app:layout_constraintTop_toBottomOf="@+id/text_12" />
        </androidx.constraintlayout.widget.ConstraintLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/constraintLayout4"
            android:layout_width="0dp"
            android:layout_height="50dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/constraintLayout3">

            <TextView
                android:id="@+id/text_13"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="칼슘(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_ca"
                app:layout_constraintEnd_toStartOf="@+id/text_14"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_14"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="콜레스테롤(mg)"
                app:layout_constraintBottom_toTopOf="@+id/text_chol"
                app:layout_constraintEnd_toStartOf="@+id/text_15"
                app:layout_constraintStart_toEndOf="@+id/text_13"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_15"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="탄수화물(g)"
                app:layout_constraintBottom_toTopOf="@+id/text_tan"
                app:layout_constraintEnd_toStartOf="@+id/text_16"
                app:layout_constraintStart_toEndOf="@+id/text_14"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_16"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="트랜스지방(g)"
                app:layout_constraintBottom_toTopOf="@+id/text_trans"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_15"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/text_ca"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_chol"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/text_13" />

            <TextView
                android:id="@+id/text_chol"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_tan"
                app:layout_constraintStart_toEndOf="@+id/text_ca"
                app:layout_constraintTop_toBottomOf="@+id/text_14" />

            <TextView
                android:id="@+id/text_tan"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/text_trans"
                app:layout_constraintStart_toEndOf="@+id/text_chol"
                app:layout_constraintTop_toBottomOf="@+id/text_15" />

            <TextView
                android:id="@+id/text_trans"
                android:layout_width="0dp"
                android:layout_height="0dp"
                android:gravity="center"
                android:text="empty"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toEndOf="@+id/text_tan"
                app:layout_constraintTop_toBottomOf="@+id/text_16" />
        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

---

Adaper

 

• int형 자료를 textview에 넣고싶다면 str형 변환이 필요함

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

    private ArrayList<One_food> food_list;

    /**
     * Provide a reference to the type of views that you are using
     * (custom ViewHolder).
     */

    @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));
    }

    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;



        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            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);

        }

        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());

        }
    }

}

---