Use Following code.
<?xml version="1.0" encoding="utf-8"?> <ripple android:color="@color/COLOR_WHILE_PRESSING" xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/round_corner"></item> </ripple>

round_corner.xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@color/BACKGROUND_COLOR" /> <corners android:radius="6dp" /> </shape>

Try that one:
ripple.xml
<?xml version="1.0" encoding="utf-8"?> <ripple android:color="@color/COLOR_WHILE_PRESSING" xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/background"></item> </ripple>
background.xml
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@color/BACKGROUND_COLOR" /> <corners android:radius="6dp" /> </shape>

You have to use diffent versions of this `drawable` file. Put this code in `res/drawable-v21/ripple.xml` and create a different `res/drawable/ripple.xml`