android.support.v7.cardview:cardBackgroundColor doesn't work

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I have the following XML code in a resource file, which represents an item in a RecyclerView:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:android.support.v7.cardview="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android.support.v7.cardview:cardBackgroundColor="#9e9e9e"
    android.support.v7.cardview:cardElevation="7dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@android:color/transparent"
            android:orientation="vertical">
            <ImageView
                android:id="@+id/type"
                android:layout_width="15dp"
                android:layout_height="15dp"
                android:layout_gravity="end" />
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <TextView
                    android:id="@+id/field_name"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:padding="2dp"
                    android:textColor="#000000"
                    android:textSize="20sp"
                    android:typeface="monospace" />
                <LinearLayout
                    android:layout_width="15dp"
                    android:layout_height="match_parent" />
            </LinearLayout>
            <LinearLayout
                android:id="@+id/main_recyclerview_item_actions"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="end"
                android:visibility="gone">
                <Button
                    android:id="@+id/delete"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="@string/delete"
                    android:textColor="@color/colorAccent"
                    style="@style/Widget.AppCompat.Button.Borderless"/>
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>
</android.support.v7.widget.CardView>

The problem is that the CardView is never get the color: 9e9e9e as the following image: The color is white not 9e9e9e

enter image description here

Where is the problem in the code? And how can I solve this problem?

4 Answers
app:cardBackgroundColor="@color/cv_bgcolor" 

worked for me.

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