Cardview - white border around card

Question

I am using a cardview as the root of a custom view I am writing. I using the v7 support library. My XML looks like this:

Answer 1

I might be late in the game, but I had the same issue. Just wanted to share a simple solution!

My custom view extended a CardView and I had a margin applied to the root element (i.e. CardView) in the XML just like in the original question. This ended up giving me the extra white border like this:

Solution was to move the margin from root of the Custom View XML to the declaration of your custom view (check comments in the snippet)

Code snippet:

<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/cvSettings"
    style="@style/DefaultCardViewStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/default_margin" <!-- Remove this -->
    app:cardElevation="@dimen/default_card_elevation">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        .
        .
        .
</android.support.v7.widget.CardView>

Ended up just moving over the margin to my custom view declaration which got rid of the extra white border:

<com.example.android.custom.MyCustomView
        android:id="@+id/custom_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/default_margin" <!-- Move it here-->
        cv:pt_widgetColor="@color/colorAccent" />

After the change, much cleaner :) :

Answer 2

use cardBackgroundColor="color" in xml card_view sample code :

<android.support.v7.widget.CardView
        android:id="@+id/card_view_khaterat"
        android:layout_width="250dp"
        android:layout_height="100dp"
        android:layout_gravity="center_horizontal"
        app:cardBackgroundColor="#f56f6c"/>

Answer 3

I know it's a bit late, but for anyone having a similar problem:

I had the same issue: A white border was shown on pre-lollipop devices.

I solved it setting the cardPreventCornerOverlap to false on your XML.

Like this:

<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="wrap_content"
    android:layout_height="match_parent"
    android:layout_marginRight="6dp"
    card_view:cardPreventCornerOverlap="false">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <!-- some other views -->
    </LinearLayout>
</android.support.v7.widget.CardView>

Hope this helps!

Answer 4

Support CardView doesn't support content clipping, because it's expensive on older devices. It's possible to clip content using Canvas.saveLayer/restoreLayer and PorterDuff modes. This is how Carbon implements rounded corners with correct content clipping. See the image: