Dialog that shows system colors table on api 31+

AndroidUtils.kt

import android.app.AlertDialog
import android.content.Context
import android.graphics.Color
import android.os.Build
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import androidx.core.content.ContextCompat
import androidx.core.graphics.ColorUtils

fun showSystemColors(context: Context) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
        fun ViewGroup.addColorRow(colorResId: Int, description: String) {
            addView(TextView(context).apply {
                val color = ContextCompat.getColor(context, colorResId)
                setBackgroundColor(color)
                text = description
                setTextColor(if (ColorUtils.calculateLuminance(color) >= 0.5f) {
                    Color.BLACK
                } else {
                    Color.WHITE
                })
                setPadding(8, 0, 8, 0)
            })
        }

        val rootView = LinearLayout(context)
        rootView.layoutParams = LinearLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        )
        rootView.orientation = LinearLayout.HORIZONTAL

        val ac1View = LinearLayout(context).apply {
            layoutParams = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            orientation = LinearLayout.VERTICAL
            addColorRow(android.R.color.system_accent1_0, "ac1_0")
            addColorRow(android.R.color.system_accent1_10, "ac1_10")
            addColorRow(android.R.color.system_accent1_50, "ac1_50")
            addColorRow(android.R.color.system_accent1_100, "ac1_100")
            addColorRow(android.R.color.system_accent1_200, "ac1_200")
            addColorRow(android.R.color.system_accent1_300, "ac1_300")
            addColorRow(android.R.color.system_accent1_400, "ac1_400")
            addColorRow(android.R.color.system_accent1_500, "ac1_500")
            addColorRow(android.R.color.system_accent1_600, "ac1_600")
            addColorRow(android.R.color.system_accent1_700, "ac1_700")
            addColorRow(android.R.color.system_accent1_800, "ac1_800")
            addColorRow(android.R.color.system_accent1_900, "ac1_900")
            addColorRow(android.R.color.system_accent1_1000, "ac1_1000")
        }
        rootView.addView(ac1View)

        val ac2View = LinearLayout(context).apply {
            layoutParams = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            orientation = LinearLayout.VERTICAL
            addColorRow(android.R.color.system_accent2_0, "ac2_0")
            addColorRow(android.R.color.system_accent2_10, "ac2_10")
            addColorRow(android.R.color.system_accent2_50, "ac2_50")
            addColorRow(android.R.color.system_accent2_100, "ac2_100")
            addColorRow(android.R.color.system_accent2_200, "ac2_200")
            addColorRow(android.R.color.system_accent2_300, "ac2_300")
            addColorRow(android.R.color.system_accent2_400, "ac2_400")
            addColorRow(android.R.color.system_accent2_500, "ac2_500")
            addColorRow(android.R.color.system_accent2_600, "ac2_600")
            addColorRow(android.R.color.system_accent2_700, "ac2_700")
            addColorRow(android.R.color.system_accent2_800, "ac2_800")
            addColorRow(android.R.color.system_accent2_900, "ac2_900")
            addColorRow(android.R.color.system_accent2_1000, "ac2_1000")
        }
        rootView.addView(ac2View)

        val ac3View = LinearLayout(context).apply {
            layoutParams = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            orientation = LinearLayout.VERTICAL
            addColorRow(android.R.color.system_accent3_0, "ac3_0")
            addColorRow(android.R.color.system_accent3_10, "ac3_10")
            addColorRow(android.R.color.system_accent3_50, "ac3_50")
            addColorRow(android.R.color.system_accent3_100, "ac3_100")
            addColorRow(android.R.color.system_accent3_200, "ac3_200")
            addColorRow(android.R.color.system_accent3_300, "ac3_300")
            addColorRow(android.R.color.system_accent3_400, "ac3_400")
            addColorRow(android.R.color.system_accent3_500, "ac3_500")
            addColorRow(android.R.color.system_accent3_600, "ac3_600")
            addColorRow(android.R.color.system_accent3_700, "ac3_700")
            addColorRow(android.R.color.system_accent3_800, "ac3_800")
            addColorRow(android.R.color.system_accent3_900, "ac3_900")
            addColorRow(android.R.color.system_accent3_1000, "ac3_1000")
        }
        rootView.addView(ac3View)

        val n1View = LinearLayout(context).apply {
            layoutParams = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            orientation = LinearLayout.VERTICAL
            addColorRow(android.R.color.system_neutral1_0, "n1_0")
            addColorRow(android.R.color.system_neutral1_10, "n1_10")
            addColorRow(android.R.color.system_neutral1_50, "n1_50")
            addColorRow(android.R.color.system_neutral1_100, "n1_100")
            addColorRow(android.R.color.system_neutral1_200, "n1_200")
            addColorRow(android.R.color.system_neutral1_300, "n1_300")
            addColorRow(android.R.color.system_neutral1_400, "n1_400")
            addColorRow(android.R.color.system_neutral1_500, "n1_500")
            addColorRow(android.R.color.system_neutral1_600, "n1_600")
            addColorRow(android.R.color.system_neutral1_700, "n1_700")
            addColorRow(android.R.color.system_neutral1_800, "n1_800")
            addColorRow(android.R.color.system_neutral1_900, "n1_900")
            addColorRow(android.R.color.system_neutral1_1000, "n1_1000")
        }
        rootView.addView(n1View)

        val n2View = LinearLayout(context).apply {
            layoutParams = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            orientation = LinearLayout.VERTICAL
            addColorRow(android.R.color.system_neutral2_0, "n2_0")
            addColorRow(android.R.color.system_neutral2_10, "n2_10")
            addColorRow(android.R.color.system_neutral2_50, "n2_50")
            addColorRow(android.R.color.system_neutral2_100, "n2_100")
            addColorRow(android.R.color.system_neutral2_200, "n2_200")
            addColorRow(android.R.color.system_neutral2_300, "n2_300")
            addColorRow(android.R.color.system_neutral2_400, "n2_400")
            addColorRow(android.R.color.system_neutral2_500, "n2_500")
            addColorRow(android.R.color.system_neutral2_600, "n2_600")
            addColorRow(android.R.color.system_neutral2_700, "n2_700")
            addColorRow(android.R.color.system_neutral2_800, "n2_800")
            addColorRow(android.R.color.system_neutral2_900, "n2_900")
            addColorRow(android.R.color.system_neutral2_1000, "n2_1000")
        }
        rootView.addView(n2View)

        AlertDialog.Builder(context)
            .setView(rootView)
            .setNegativeButton(android.R.string.cancel) {_,_ -> }
            .create()
            .apply {
                setCanceledOnTouchOutside(false)
                show()
            }
    }
}