MainActivity.kt

class MainActivity : AppCompatActivity(R.layout.activity_main) {

    private lateinit var pagerAdapter: PagerAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        pagerAdapter = PagerAdapter(this)
        viewPager.adapter = pagerAdapter

        pagerAdapter.setItems(generatePagerItems())
    }

    private fun generatePagerItems(): MutableList<PagerItem> {
        return (1..ITEMS_COUNT).map {
            val color = if (it < colors.size) it else it % colors.size
          
            PagerItem(it, "Item $it", colors[color], 0)
        }.toMutableList()
    }
}