colors.xml

    <color name="color1">#F57C00</color>
    <color name="color2">#EF5350</color>
    <color name="color3">#689F38</color>
    <color name="color4">#F7B500</color>
    <color name="color5">#FF44D0</color>
    <color name="color6">#1976D2</color>

RandomColorHelper.kt

import android.content.Context
import androidx.core.content.ContextCompat

class RandomColorHelper(context: Context) {

    private val allColors: List<Int> = listOf(
        ContextCompat.getColor(context, R.color.color1),
        ContextCompat.getColor(context, R.color.color2),
        ContextCompat.getColor(context, R.color.color3),
        ContextCompat.getColor(context, R.color.color4),
        ContextCompat.getColor(context, R.color.color5),
        ContextCompat.getColor(context, R.color.color6)
    )

    fun getRandomColor(position: Int): Int {
        val resolvedPosition = position % 6
        return allColors[resolvedPosition]
    }

    fun getRandomColorForInitials(string: String): Int {
        val firstLetter = string.first().toString()
        return when {
            firstLetter.contains(Regex("[A-D]")) -> {
                allColors[0]
            }
            firstLetter.contains(Regex("[E-H]")) -> {
                allColors[1]
            }
            firstLetter.contains(Regex("[I-O]")) -> {
                allColors[2]
            }
            firstLetter.contains(Regex("[P-T]")) -> {
                allColors[3]
            }

            firstLetter.contains(Regex("[U-W]")) -> {
                allColors[4]
            }
            else -> {
                allColors[5]
            }
        }
    }
}