Rounded corners for custom AlertDialog - kotlin

Question

I have been updating my apps forgot password functionality from Activity to simple custom Alert Dialog. How should I add rounded corners to Dialog window? I have already read multiple tutorials, but none seem to work in my case. I read from somewhere that I should use setBackgroundResources method somewhere, but I'm not sure where.
Kotlin code
// Forgot password textview onClick Listener
binding.tvForgotPassword.setOnClickListener {
// Inflate add_item_dialog.xml custom view
val dialogView = LayoutInflater.from(this).inflate(R.layout.dialog_forgot_password, null)
// Add AlertDialog Builder
val dialogBuilder = AlertDialog.Builder(this)
.setView(dialogView)
// Binding add_item_dialog layout
val dialogBinding = DialogForgotPasswordBinding.bind(dialogView)
// Show Forgot password Dialog
val customAlertDialog = dialogBuilder.show()
dialogBinding.ivCloseDialog.setOnClickListener {
customAlertDialog.dismiss()
}
}
dialog_forgot_password.xml
<androidx.cardview.widget.CardView
android:layout_width="350dp"
android:layout_height="500dp"
app:cardCornerRadius="20dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="350dp"
android:layout_height="500dp">
<ImageView
android:id="#+id/iv_closeDialog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.94"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.060000002"
app:srcCompat="#drawable/ic_close" />
<TextView
android:id="#+id/tv_forgotPasswordInfo"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:gravity="center"
android:textSize="18sp"
android:text="#string/enter_email"
android:textColor="#color/ColorPrimary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tv_forgotPassword" />
<Button
android:id="#+id/submitBtn"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:background="#drawable/button"
android:elevation="4dp"
android:text="#string/submit"
android:textColor="#color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/emailForgot"
app:layout_constraintVertical_bias="1.0" />
<TextView
android:id="#+id/tv_forgotPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="36dp"
android:fontFamily="sans-serif-black"
android:text="#string/forgot_password"
android:textColor="#color/ColorPrimary"
android:textSize="40sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/iv_closeDialog" />
<EditText
android:id="#+id/emailForgot"
android:layout_width="300dp"
android:layout_height="40dp"
android:background="#drawable/rounded_edittext"
android:ems="10"
android:hint="#string/email_address"
android:importantForAutofill="no"
android:inputType="textEmailAddress"
android:paddingStart="15dp"
android:textColorHint="#color/ColorPrimary"
app:layout_constraintBottom_toTopOf="#+id/submitBtn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tv_forgotPasswordInfo"
app:layout_constraintVertical_bias="1.0" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
Rounded_framelayout.xml
<solid android:color="#FFFFFF"/>
<padding android:left="2dp"
android:top="2dp"
android:right="2dp"
android:bottom="2dp"/>
<corners android:radius="20dp" />

Answer 1

Please take a look at this guide for how to customize dialogs.
In short, you need to create a dialog like normal, but set the background resource before you show it:
val builder = AlertDialog.Builder(context)
builder.setView(R.layout.item_dialog)
val dialog = builder.create()
dialog.window?.decorView?.setBackgroundResource(R.drawable.dialog_background) // setting the background
dialog.show()
where dialog_background is defined like so:
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="16dp" />
<solid android:color="?android:colorBackground" />
</shape>

Answer 2

TRY THIS:
class your_kotlin_filename :DialogFragment() {
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
dialog!!.window?.setBackgroundDrawableResource(R.drawable.Rounded_framelayout);
return inflater.inflate(R.layout.dialog_forgot_password, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
............your code for forget password...........
}
override fun onStart() {
super.onStart()
val width = (resources.displayMetrics.widthPixels * 0.95).toInt()
val height = (resources.displayMetrics.heightPixels * 0.43).toInt()
dialog!!.window?.setLayout(width, height)
dialog!!.setCanceledOnTouchOutside(true)
}