android kotlin - MaterialCardView corner radius programmatically

MainActivity.kt

package com.cfsuman.kotlintutorials

import android.app.Activity
import android.content.Context
import android.os.Bundle
import android.util.TypedValue
import com.google.android.material.card.MaterialCardView


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

        // get the context
        val context = this


        // get the widgets reference from XML layout
        val materialCardView2 = findViewById<MaterialCardView>(
            R.id.materialCardView2)


        // programmatically set card corner radius
        materialCardView2.apply {
            // card corner radius 12 dp
            // make it rounded corners card view
            radius = 12.toDp(context).toFloat()
        }
    }
}



// extension method to convert values to dp
fun Int.toDp(context: Context):Int = TypedValue.applyDimension(
    TypedValue.COMPLEX_UNIT_DIP,
    this.toFloat(),
    context.resources.displayMetrics
).toInt()
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"
    android:background="#DCDCDC"
    android:id="@+id/rootLayout"
    android:padding="24dp">

    <com.google.android.material.card.MaterialCardView
        android:id="@+id/materialCardView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardBackgroundColor="#8FBC8F"
        app:cardCornerRadius="12dp"
        app:cardElevation="8dp"
        app:contentPadding="32dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.material.textview.MaterialTextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fontFamily="sans-serif"
            android:text="Card Corner Radius In XML"
            android:textSize="26sp" />
    </com.google.android.material.card.MaterialCardView>

    <com.google.android.material.card.MaterialCardView
        android:id="@+id/materialCardView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        app:cardBackgroundColor="#DE5D83"
        app:cardElevation="8dp"
        app:contentPadding="32dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/materialCardView1">

        <com.google.android.material.textview.MaterialTextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fontFamily="sans-serif"
            android:text="Material Card Corner Radius Programmatically."
            android:textSize="26sp" />
    </com.google.android.material.card.MaterialCardView>

</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle dependencies

// Material components
implementation 'com.google.android.material:material:1.6.1'
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