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: 
![screenshot_2014-12-27-20-31-55](https://cloud.githubusercontent.com/assets/2862724/5561610/c8a1c04e-8e08-11e4-9bd0-3eb6eea57a00.png)

But in [android docs](http://developer.android.com/training/material/lists-cards.html#CardView) and in [this article](http://treyrobinson.net/blog/android-l-tutorials-part-3-recyclerview-and-cardview/) 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.*