Android CardView with rounded corners displays grey corners

It is because of shadow, you need to give space to cardview to show full shadow. Add android:layout_margin="5dp" to CardView and you will see that the "grey" color is cut shadow.

Solution is adding app:cardUseCompatPadding="true" to CardView and it will give needed spacing.

Try this...

Just set 0 value to app:cardElevation

.....
<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@android:color/white"
    app:cardCornerRadius="6dp"
    app:cardElevation="0dp">
.....

OR you can call cardView.setCardElevation(0) to disable shadow programmatically.