class MainActivity : AppCompatActivity() { private val binding by lazy { ActivityMainBinding.inflate(layoutInflater) } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(binding.root) val adapter = PagerAdapter(this) binding.pager.adapter = adapter // MDC の TabLayout と組み合わせるときは TabLayoutMediator を使う // TabLayoutMediator の attach は ViewPager2 に adapter をセットした後に行う TabLayoutMediator(binding.tabLayout, binding.pager) { tab, position -> tab.text = adapter.getTitle(position) }.attach() } } private class PagerAdapter( fragmentActivity: FragmentActivity ) : FragmentStateAdapter(fragmentActivity) { override fun getItemCount(): Int { return ... } override fun createFragment(position: Int): Fragment { return PageFragment.newInstance(...) } fun getTitle(position: Int): String { return ... } }
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ViewPager2
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