뷰페이저2와 탭으로 스와이프 뷰 만들기(FragmentStateAdapter) 2021-06-09

탭 레이아웃과 뷰페이저2를 사용하는 방법에 대해 포스팅하겠습니다 :)

해당 예제는 안드로이드 개발 문서를 참조하였습니다.

 

[build.gradle(Module:app)]

    implementation("androidx.fragment:fragment-ktx:1.3.4")
    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: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.fragment.app.FragmentContainerView
        android:id="@+id/activity_to_fragment_container_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

[layout_collection_demo.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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:ignore="MissingDefaultResource">

    <com.google.android.material.tabs.TabLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/pager"
        android:id="@+id/tab_layout"/>

    <androidx.viewpager2.widget.ViewPager2
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@id/tab_layout"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:id="@+id/pager"/>

</androidx.constraintlayout.widget.ConstraintLayout>

 

[fragment_collection_object.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">

    <TextView
        android:id="@+id/fragment_textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="@color/black"
        android:textSize="72sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

[MainActivity.kt]

package com.devjamesp.viewpager2activity

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.fragment.app.commit

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

        if (savedInstanceState == null) {
            supportFragmentManager.commit {
                setReorderingAllowed(true)
                add(R.id.activity_to_fragment_container_view, CollectionDemoFragment())
            }
        }
    }
}

 

[CollectionDemoFragment.kt]

package com.devjamesp.viewpager2activity

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.viewpager2.widget.ViewPager2
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator

class CollectionDemoFragment : Fragment() {
    private lateinit var pager: ViewPager2
    private lateinit var viewPager2Adapter: ViewPager2Adapter
    private lateinit var tabLayout : TabLayout
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.layout_collection_demo, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        viewPager2Adapter = ViewPager2Adapter(this)
        pager = view.findViewById<ViewPager2>(R.id.pager)
        pager.adapter = viewPager2Adapter

        /* tabLayout attach */
        tabLayout = view.findViewById(R.id.tab_layout)
        TabLayoutMediator(tabLayout, pager) { tab, position ->
            tab.text = "OBJECT ${(position + 1)}"
        }.attach()
    }
}

 

[ViewPager2Adatper.kt]

package com.devjamesp.viewpager2activity

import android.os.Bundle
import androidx.fragment.app.Fragment
import androidx.viewpager2.adapter.FragmentStateAdapter

class ViewPager2Adapter(fragment : Fragment) : FragmentStateAdapter(fragment) {
    override fun getItemCount(): Int = 4

    override fun createFragment(position: Int): Fragment {
        val fragment = DemoObjectFragment()
        fragment.arguments = Bundle().apply {
            putInt("testKey", position + 1)
        }
        return fragment
    }
}

 

[DemoObjectFragment.kt]

package com.devjamesp.viewpager2activity

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 DemoObjectFragment : Fragment() {
    private lateinit var tvNum : TextView
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_collection_object, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        arguments?.takeIf { it.containsKey("testKey") }?.apply {
            tvNum = view.findViewById(R.id.fragment_textView)
            tvNum.text = getInt("testKey").toString()
        }
    }

}

 

[실행 결과]

 

https://developer.android.com/guide/navigation/navigation-swipe-view-2

ViewPager2를 사용하여 탭으로 스와이프 뷰 만들기  |  Android 개발자  |  Android Developers