MainActivity_1.kt

class MainActivity : AppCompatActivity() {

    private val viewPager by lazy { findViewById<ViewPager>(R.id.viewPager) }

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

        //getSections somehow from API/local storage

        val pagerAdapter = PagerAdapter(supportFragmentManager, sections)
        viewPager.adapter = pagerAdapter

        //...

    }
    //...
}