[Java] ViewPager2 + FragmentStateAdapter

build.gradle (Module: app)

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

 

 

 

 

 

 

 

viewpager_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="#FFBBAA"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="혀가 길지 않은 개발자"
        android:textStyle="bold"
        android:textSize="30dp"
        android:gravity="center"/>

    <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" />

</LinearLayout>

viewpager_fragment.xml

 

 

 

 

 

 

ViewPagerFragment.java

package com.jwsoft.javaproject;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

public class ViewPagerFragment extends Fragment {

    TextView txtCount;
    int position;

    public ViewPagerFragment(int position) {
        this.position = position;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.viewpager_fragment, container, false);
        txtCount = view.findViewById(R.id.txtCount);
        txtCount.setText(Integer.toString(position + 1));

        return view;
    }
}

 

 

 

 

 

 

 

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:id="@+id/viewPager2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml

 

 

 

 

 

 

ViewPagerAdapter.java

package com.jwsoft.javaproject;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.adapter.FragmentStateAdapter;

public class ViewPagerAdapter extends FragmentStateAdapter {

    public ViewPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        ViewPagerFragment fragment = new ViewPagerFragment(position);

        return fragment;
    }

    @Override
    public int getItemCount() {
        return 10;
    }
}

 

 

 

 

 

 

 

 

MainActivity.java

package com.jwsoft.javaproject;

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

import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    private ViewPager2 viewPager2;

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

        ViewPagerAdapter adapter = new ViewPagerAdapter(this);

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

    }
}

실행 결과