안드로이드 앱 개발 연습 - 6 | ViewPager & TabLayout

ViewPager with Fragment

FragmentAdapter.kt

class FragmentAdapter(fragmentActivity: FragmentActivity) : FragmentStateAdapter(fragmentActivity) {
    var fragmentList = listOf<Fragment>()
    override fun getItemCount(): Int {
        return fragmentList.size
    }

    override fun createFragment(position: Int): Fragment {
        return fragmentList.get(position)
    }

}

MainActivity.kt

class MainActivity : AppCompatActivity() {
    val binding by lazy { ActivityMainBinding.inflate(layoutInflater) }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        val fragmentList = listOf(FragmentA(), FragmentB(), FragmentC(), FragmentD())
        val adapter = FragmentAdapter(this)
        adapter.fragmentList = fragmentList
        binding.viewPager.adapter = adapter

        val tabTitles = listOf<String>("A", "B", "C", "D")
        TabLayoutMediator(binding.tabLayout, binding.viewPager) { tab, position ->
            tab.text = tabTitles[position]
        }.attach()
    }
}

TabLayoutMediator로 tabLayout과 viewPager를 연결

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ViewPager with View

item_viewpager.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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Title"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

CustomPagerAdapter.kt

class CustomPagerAdapter: RecyclerView.Adapter<Holder>() {
    var textList = listOf<String>()

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
        val binding = ItemViewpagerBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return Holder(binding)
    }

    override fun onBindViewHolder(holder: Holder, position: Int) {
        val text = textList[position]
        holder.setText(text)
    }

    override fun getItemCount(): Int {
        return textList.size
    }
}

class Holder(val binding: ItemViewpagerBinding): RecyclerView.ViewHolder(binding.root) {
    fun setText(text: String) {
        binding.textView.text = text
    }
}

MainActivity.kt

class MainActivity : AppCompatActivity() {
    val binding by lazy { ActivityMainBinding.inflate(layoutInflater) }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)

        val textList = listOf("Title: View A", "Title: View B", "Title: View C", "Title: View D")
        val customAdapter = CustomPagerAdapter()
        customAdapter.textList = textList
        binding.viewPager.adapter = customAdapter

        val tabTitles = listOf("View A", "View B", "View C", "View D")
        TabLayoutMediator(binding.tabLayout, binding.viewPager) { tab, position ->
            tab.text = tabTitles[position]
        }.attach()
    }
}