[Java] ViewPager2 + RecyclerView.Adapter

build.gradle (Module: app)

dependencies {
    implementation 'androidx.viewpager2:viewpager2:1.0.0'
}

 

 

 

 

 

 

 

activity_main.xml

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

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/viewPager2"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml

 

 

 

 

 

 

viewpager_item.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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#CCFFCC">

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

    <TextView
        android:id="@+id/txtCount"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="1 page"
        android:textSize="30dp"
        android:textStyle="bold"
        android:gravity="center"
        app:layout_constraintTop_toBottomOf="@id/txtView"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

viewpager_item.xml

 

 

 

 

 

 

 

MyRecyclerViewAdapter.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 MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.MyViewHolder> {
    ArrayList<String> arrData;

    public MyRecyclerViewAdapter(ArrayList<String> arrData) {
        this.arrData = arrData;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView txtCount;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            txtCount = itemView.findViewById(R.id.txtCount);
        }
    }

    @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.viewpager_item, parent, false);
        MyViewHolder viewHolder =  new MyViewHolder(view);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.txtCount.setText(arrData.get(position) + " page");
    }

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

 

 

 

 

 

 

 

 

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;

import android.os.Bundle;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private ViewPager2 viewPager2;

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

        ArrayList<String> arrData = new ArrayList<>();
        for (int i=1; i<=100; i++) {
            arrData.add(Integer.toString(i));
        }

        MyRecyclerViewAdapter adapter = new MyRecyclerViewAdapter(arrData);

        viewPager2 = findViewById(R.id.viewPager2);
        viewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);
        viewPager2.setAdapter(adapter);

    }
}

실행 결과