[Kotlin] 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

 

 

 

 

 

 

MyFragment.kt

package com.jwsoft.kotlinproject

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.fragment.app.Fragment

class MyFragment(position: Int) : Fragment() {

    private var position = position + 1

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        val view: View = inflater.inflate(R.layout.viewpager_fragment, container, false)
        val txtCount: TextView = view.findViewById(R.id.txtCount)
        txtCount.text = position.toString() + " page"

        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" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_main.xml

 

 

 

 

 

 

MyViewPagerAdapter.kt

package com.jwsoft.kotlinproject

import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.viewpager2.adapter.FragmentStateAdapter

class MyViewPagerAdapter(fragmentActivity: FragmentActivity)
    : FragmentStateAdapter(fragmentActivity) {

    override fun createFragment(position: Int): Fragment {
        return MyFragment(position)
    }

    override fun getItemCount(): Int {
        return 5
    }
}

 

 

 

 

 

 

 

MainActivity.kt

package com.jwsoft.kotlinproject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.viewpager2.widget.ViewPager2

class MainActivity : AppCompatActivity() {

    private lateinit var viewPager2: ViewPager2

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewPager2 = findViewById(R.id.viewPager2)

        var adapter = MyViewPagerAdapter(this)
        viewPager2.orientation = ViewPager2.ORIENTATION_VERTICAL
        viewPager2.adapter = adapter
    }
}

실행 결과