Android create gradient drawable programmatically (allow to use more than 3 colors) example

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <View
        android:id="@+id/view1"
        android:layout_width="200dp"
        android:layout_height="200dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <color name="platinum_gradient1">#DBDBDB</color>
    <color name="platinum_gradient2">#FFFFFF</color>
    <color name="platinum_gradient3">#BFBEBE</color>
    <color name="platinum_gradient4">#F1F1F1</color>
    <color name="platinum_gradient5">#FAFAFA</color>

    <color name="gold_card_gradient_1">#A0884D</color>
    <color name="gold_card_gradient_2">#CCB06C</color>
    <color name="gold_card_gradient_3">#A0884D</color>
    <color name="gold_card_gradient_4">#705820</color>
    <color name="gold_card_gradient_5">#A0884D</color>

</resources>

GradientConstant.kt

import android.content.Context
import android.graphics.drawable.GradientDrawable
import androidx.core.content.ContextCompat

class GradientConstant {

    companion object {
        
        fun goldGradient(activity: Context): GradientDrawable {
            val colors: IntArray = intArrayOf(
                ContextCompat.getColor(activity, R.color.gold_card_gradient_1),
                ContextCompat.getColor(activity, R.color.gold_card_gradient_2),
                ContextCompat.getColor(activity, R.color.gold_card_gradient_3),
                ContextCompat.getColor(activity, R.color.gold_card_gradient_4),
                ContextCompat.getColor(activity, R.color.gold_card_gradient_5)
            )
            val gradientDrawable = GradientDrawable(GradientDrawable.Orientation.TL_BR, colors)
            val arr2 = FloatArray(8)
            arr2[0] = 0f
            arr2[1] = 30f
            arr2[2] = 0f
            arr2[3] = 30f
            arr2[4] = 30f
            arr2[5] = 30f
            arr2[6] = 30f
            arr2[7] = 30f
            //{mTopLeftRadius, mTopLeftRadius, mTopRightRadius, mTopRightRadius, mBottomRightRadius, mBottomRightRadius, mBottomLeftRadius, mBottomLeftRadius}
            gradientDrawable.cornerRadii = arr2
            gradientDrawable.setStroke(
                3,
                ContextCompat.getColor(activity, R.color.gold_card_gradient_5)
            )

            return gradientDrawable
        }

        fun platinumGradient(activity: Context): GradientDrawable {
            val colors: IntArray = intArrayOf(
                ContextCompat.getColor(activity, R.color.platinum_gradient1),
                ContextCompat.getColor(activity, R.color.platinum_gradient2),
                ContextCompat.getColor(activity, R.color.platinum_gradient3),
                ContextCompat.getColor(activity, R.color.platinum_gradient4),
                ContextCompat.getColor(activity, R.color.platinum_gradient5)
            )
            val gradientDrawable = GradientDrawable(GradientDrawable.Orientation.BR_TL, colors)
            val arr2 = FloatArray(8)
            arr2[0] = 30f
            arr2[1] = 30f
            arr2[2] = 30f
            arr2[3] = 30f
            arr2[4] = 30f
            arr2[5] = 30f
            arr2[6] = 30f
            arr2[7] = 30f
            gradientDrawable.cornerRadii = arr2
            return gradientDrawable
        }

    }
}

MainActivty.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View

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

        val goldBackground = GradientConstant.goldGradient(this)

        val view1 = findViewById<View>(R.id.view1)
        view1.background = goldBackground
    }
}