<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="wrap_content" card_view:cardCornerRadius="8dp" card_view:cardElevation="4dp"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" /> </android.support.v7.widget.CardView> gradle implementation 'com.android.support:cardview-v7:28.0.0'