Ripple effect on Android Lollipop CardView

I'm trying to get a CardView to display the ripple effect when touched by setting the android:backgound attribute in the activity XML file as described here on the Android Developers page, but it isn't working. No animation at all, but the method in onClick is called. I've also tried creating a ripple.xml file as suggested here, but same result.

The CardView as it appears in the activity's XML file:

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="155dp"
    android:layout_height="230dp"
    android:elevation="4dp"
    android:translationZ="5dp"
    android:clickable="true"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:onClick="showNotices"
    android:background="?android:attr/selectableItemBackground"
    android:id="@+id/notices_card"
    card_view:cardCornerRadius="2dp">

</android.support.v7.widget.CardView> 

I'm relatively new to android development, so I might have made a few obvious mistakes.

Solution 1:

You should add following to CardView:

android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"

Solution 2:

Add these two line code into your xml view to give ripple effect on your cardView.

android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"