[Java] RecyclerView

build.gradle (Module: app)

dependencies {
    // 리사이클러뷰 추가
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
}

 

 

 

 

 

 

activity_main.xml

<?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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml

 

 

 

 

 

 

recyclerview_item.xml

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

    <TextView
        android:id="@+id/txtView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="혀가 길지 않은 개발자"
        android:textSize="30dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

recyclerview_item.xml

 

 

 

 

 

 

RecyclerViewAdapter.java

package com.jwsoft.javaproject;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

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

import java.util.ArrayList;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {

    private ArrayList<String> mData;

    public RecyclerViewAdapter(ArrayList<String> arrData) {
        mData = arrData;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView txtView;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            txtView = itemView.findViewById(R.id.txtView);

        }
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        Context context = parent.getContext();
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.recyclerview_item, parent, false);
        MyViewHolder myViewHolder = new MyViewHolder(view);

        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        String strData = mData.get(position);
        holder.txtView.setText(position + "번째 혀가 길지 않은 개발자");
    }

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

 

 

 

 

 

 

 

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    RecyclerView recyclerView;

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

        ArrayList<String> arrListData = new ArrayList<>();
        for (int i=0; i<100; i++) {
            arrListData.add(Integer.toString(i));
        }

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(
                new LinearLayoutManager(getApplicationContext(),
                        RecyclerView.VERTICAL,
                        false));
        RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(arrListData);
        recyclerView.setAdapter(recyclerViewAdapter);
	recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayout.VERTICAL));
    }
    
}

실행 결과