android - Cardview, cardCornerRadius not working -

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i'm trying set cards cardcornerradius not working.

take code below:

cardview last property cardcornerradius

<android.support.v7.widget.cardview xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:id="@+id/user_card_view"     android:layout_width="match_parent"     android:layout_height="@dimen/card_height"     android:layout_gravity="center"     android:layout_marginbottom="@dimen/md_keylines"     android:layout_marginleft="@dimen/md_keylines"     android:layout_marginright="@dimen/md_keylines"     android:foreground="?attr/selectableitembackground"     android:theme="@style/themeoverlay.appcompat.dark.actionbar"     app:cardcornerradius="3dp">

dependencies

compile 'com.android.support:appcompat-v7:23.3.0' compile 'com.android.support:design:23.3.0' compile 'com.android.support:cardview-v7:23.3.0'

i didn't error in console, don't know happening.

any idea how it?

thanks!

use card_view:cardcornerradius="x"


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