MainActivity.java

package com.example.fragmentandviewpager;

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

import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

        ViewPager2 viewpager = findViewById(R.id.viewPager);
        //定義adapter
        ViewPagerAdapter viewPagerAdapter=new ViewPagerAdapter();
        viewpager.setAdapter(viewPagerAdapter);
    }
}
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ViewPagerAdapter.java

package com.example.fragmentandviewpager;

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 androidx.viewpager.widget.PagerAdapter;

public class ViewPagerAdapter extends RecyclerView.Adapter<ViewPagerAdapter.ViewPagerViewHolder> {

    @NonNull
    @Override
    public ViewPagerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //解析  定義ViewPagerViewHolder後需要去適配
        return new ViewPagerViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_page,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewPagerViewHolder holder, int position) {
            //展示不同的資料

    }

    @Override
    public int getItemCount() {
        return 5;
    }

    class ViewPagerViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        RecyclerView recyclerView;
        public ViewPagerViewHolder(@NonNull View itemView) {
            super(itemView);
            recyclerView = itemView.findViewById(R.id.itempage);
            textView=itemView.findViewById(R.id.tvTitle);
        }
    }
}

-----------------------------------------------------------------------------
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.viewpager2.widget.ViewPager2
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/viewPager"
    android:background="#ff99"/>

</androidx.constraintlayout.widget.ConstraintLayout>

-----------------------------------------------------------------------------
item_page.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/itempage">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textColor="#ff99"
        android:textSize="32sp"
        android:text="=-="
        android:id="@+id/tvTitle"/>
</RelativeLayout>