Develop Reference

How to add Image without this white background?

enter image description here
Here it is a XML file,
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_margin="10dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardBackgroundColor="#fff2f2"
android:foreground="?android:attr/selectableItemBackground"
app:cardCornerRadius="12dp"
app:cardElevation="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/tick"
android:id="#+id/image2"/>
</LinearLayout>
And Mainactivity.java,
item2List.add(new Items2(R.drawable.checked));

The default color of CardView is White. If you want to change it to some other color use following code.
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardBackgroundColor="#color/white">
</android.support.v7.widget.CardView>
or you can set cardBackgroundColor to transparent(if you don't want any color) by setting cardBackgroundColor as
app:cardBackgroundColor="#android:color/transparent"

Set app:cardBackgroundColor="#android:color/transparent" instead of app:cardBackgroundColor="#fff2f2".
This will take background of your Image rather than force white background.

Here, I have no idea about your image is .png or .jpeg, but if your image is not .png then take .png image and if you have already taken .png image than set cardview background transparent.
Here, use the cardBackgroundColor attribute to remove color and set transparent and cardElevation attribute to remove the drop shadow.
Please try below:-
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardElevation="0dp"
app:cardBackgroundColor="#android:color/transparent" >
If you you use API level 21 and higher and in case of cardBackgroundColor not work properly you can use android:backgroundTint. In my case it works.
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardElevation="0dp"
android:backgroundTint="#android:color/transparent">

Android remove white border from cardview on API level 4

my android version is 4.2 and i'm trying to remove white border and space from that but my solution as card_view:cardPreventCornerOverlap="false" from xmlns:app="http://schemas.android.com/apk/res-auto" namespace doesnt work correctly
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:elevation="0dp"
card_view:cardPreventCornerOverlap="false">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/market_item_background">
<ImageView
android:id="#+id/market_thumbnail"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="centerCrop"/>
</RelativeLayout>
this is part of my application which i used CardView

Try setting
setCardElevation(0);
setMaxCardElevation(0);
and
card_view:cardPreventCornerOverlap="false"
Source: Cardview - white border around card

After much research only thing work for me with pre lollipop devices
with using both
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardPreventCornerOverlap="false"
app:cardUseCompatPadding="true"
in CardView,
this is a old question but might help somebody

Replace android:layout_margin="10dp"
for android:layout_padding="10dp"

I think that setting setMaxCardElevation(0) will be enough in that case.
No need in setCardElevation(0) or card_view:cardPreventCornerOverlap="false"

I set card background color to transparent and it makes the white border disappear
app:cardBackgroundColor="#android:color/transparent"

SimpleDraweeView round corners in XML

I'm trying to round specific corners of image using Fresco lib.
As shown in the pic, how to round the bottom left corner of the image.
Here is the xml:
<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:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="180dp"
android:layout_marginBottom="4.0dp"
android:layout_marginLeft="8.0dp"
android:layout_marginRight="8.0dp"
android:layout_marginTop="4.0dp"
card_view:cardCornerRadius="5dp"
card_view:cardPreventCornerOverlap="false"
>
<com.facebook.drawee.view.SimpleDraweeView xmlns:fresco="http://schemas.android.com/apk/res-auto"
android:id="#+id/image1"
android:layout_width="145dp"
android:layout_height="180dp"
fresco:placeholderImage="#color/pink"
fresco:roundedCornerRadius="5dp"
fresco:roundBottomRight="false"
fresco:roundTopRight="false"
fresco:roundBottomLeft="true"/>
</android.support.v7.widget.CardView>

If you have in your parent layout xmlns:app="http://schemas.android.com/apk/res-auto" and xmlns:fresco="http://schemas.android.com/tools" use
app:roundedCornerRadius="5dp"
instead
fresco:roundedCornerRadius="5dp"

You don't need to use CardView.
Use following lines, according to your requirement:
fresco:roundTopLeft="true"
fresco:roundTopRight="false"
fresco:roundBottomLeft="false"
fresco:roundBottomRight="true"
fresco:roundTopStart="false"
fresco:roundTopEnd="false"
fresco:roundBottomStart="false"
fresco:roundBottomEnd="false"
For reference

I think your image is going out of your CardView area and that is creating problem.
You can try out by giving your CardView height as wrap_content and give slight padding_left and padding_bottom to SimpleDraweeView

Android: why are CardView margins not showing white background?

I have set up a CardView in a RecyclerView list. The layout_marginTop and layout_marginBottom are showing a grey color rather than the white background I had hoped to see (image below). Any ideas on how to get the top and bottom margins to show a white background?
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
card_view:cardCornerRadius="6dp"
android:layout_margin="4dp">
<TextView
android:id="#+id/cardText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
android:background="#android:color/white" />
</android.support.v7.widget.CardView>

Removed the TextView background and added this background to the CardView:
"card_view:cardBackgroundColor="some color""

Add some margin to card
<android.support.v7.widget.CardView
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="7dp"
app:cardCornerRadius="2dp"
app:cardElevation="4dp">
</android.support.v7.widget.CardView>

Make sure you're actually populating it with data from your domain model, i.e. check that you've implemented <data> and <variable> tags and that you've set your android:text="#{}" to the appropriate object.

Cardview - white border around card

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:
<?xml version="1.0" encoding="utf-8"?>
<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:cardElevation="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<!-- some other views -->
</LinearLayout>
</android.support.v7.widget.CardView>
My problem is that I am getting a white border around my card view. It looks like it is there to indicate elevation as it is thicker on the right side. I've tried adjusting cardElevation and MaxCardElevation in my XML like so :
card_view:cardElevation="0dp"
and in code in my custom view that extends CardView and uses this layout:
setCardElevation(0);
setMaxCardElevation(0);
But the white border persists. I'm not sure how to get rid of it. If anyone had any input into why this is happening or suggestions on how I can remove the white border it would be appreciated. Thanks much.

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>

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:

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 :) :

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"/>