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">