I have implemented CardView in my app and everything works fine except there is a little padding around the image if I put radius to the card.
It appears like this:
But in android docs and in this article the image takes the entire cardview, so can u help me achieve that.
My layout file is like:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:card_view="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="8dp"> <android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="200dp" card_view:cardBackgroundColor="@android:color/white" card_view:cardCornerRadius="4dp"> <ImageView android:id="@+id/media_image_view" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop"/> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:alpha="0.8" android:background="?attr/colorPrimary" android:padding="4dp"> <TextView android:id="@+id/media_download" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:textSize="11sp"/> <TextView android:id="@+id/category_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:textColor="@color/primary_text" android:textSize="12sp"/> </RelativeLayout> </android.support.v7.widget.CardView> </LinearLayout>
NOTE: The screenshot is captured on a pre-lollipop device.
In fact, the Android system does just that: Before L, CardView adds padding to its content and draws shadows to that area. This padding amount is equal to maxCardElevation + (1 - cos45) * cornerRadius on the sides and maxCardElevation * 1.5 + (1 - cos45) * cornerRadius on top and bottom.
The padding is expressed in pixels for the left, top, right and bottom parts of the view. Padding can be used to offset the content of the view by a specific number of pixels. For instance, a left padding of 2 will push the view's content by 2 pixels to the right of the left edge.
I went through the developer docs again and found that:
On API 20 and before, CardView does not clip the bounds of the Card for the rounded corners. Instead, it adds padding to content so that it won't overlap with the rounded corners.
So for pre-lollipop devices I have to call setPreventCornerOverlap (false);
on the cardview.
Update: The same can be done through xml code by adding app:cardPreventCornerOverlap="false"
in card view.
Setting app:cardPreventCornerOverlap="false"
will resolve the problem but also remove corner all pre-lollipop devices. If you want round corner on all devices, add it manually:
card_view_round_corner_background.xml
<?xml version="1.0" encoding="utf-8"?> <layer-list xmlns:android="http://schemas.android.com/apk/res/android"> <item> <shape android:shape="rectangle"> <solid android:color="@color/transparent"/> <stroke android:width="2dp" android:color="@color/Black"/> </shape> </item> <item> <shape android:shape="rectangle"> <solid android:color="@color/transparent"/> <corners android:radius="6dp"/> <stroke android:width="2dp" android:color="@color/Black"/> </shape> </item> </layer-list>
In cardview
<android.support.v7.widget.CardView android:layout_width="match_parent" android:layout_height="match_parent" android:focusable="true" android:clickable="true" android:foreground="?android:attr/selectableItemBackground"card_view:cardCornerRadius="@dimen/conner_radius" card_view:cardBackgroundColor="@color/Black" card_view:cardElevation="@dimen/z_card"> <!-- Put your card contain here --> <View android:background="@drawable/card_view_round_corner_border" android:layout_width="match_parent" android:layout_height="match_parent" />
But this solution only works on solid background such as black or white.
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