transparent cardview in android code example

Example: android studio cardview background transparent

<androidx.cardview.widget.CardView
                                    xmlns:card_view="http://schemas.android.com/apk/res-auto"
                                    xmlns:android="http://schemas.android.com/apk/res/android"
                                    android:id="@+id/cardView"
                                    android:layout_width="wrap_content"
                                    android:layout_height="wrap_content"
                                    android:layout_marginTop="64dp"
                                    card_view:cardBackgroundColor="@android:color/transparent"
                                    app:cardCornerRadius="20dp"
                                    app:cardElevation="0dp">