Android : GridLayout with CardView

gridLayout.xml

<GridLayout
        android:columnCount="2"
        android:rowCount="3"
        android:alignmentMode="alignMargins"
        android:columnOrderPreserved="false"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="14dp"
        >

        <!-- 1 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="3dp"
            app:cardCornerRadius="3dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>

        <!-- 2 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="8dp"
            app:cardCornerRadius="8dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>

        <!-- 3 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="8dp"
            app:cardCornerRadius="8dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>

        <!-- 4 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="8dp"
            app:cardCornerRadius="8dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>

        <!-- 5 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="8dp"
            app:cardCornerRadius="8dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>

        <!-- 6 -->
        <android.support.v7.widget.CardView
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_columnWeight="1"
            android:layout_rowWeight="1"
            android:layout_marginBottom="16dp"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            app:cardElevation="8dp"
            app:cardCornerRadius="8dp">
            <ImageView
                android:layout_width="100dp"
                android:layout_height="100dp"
                android:layout_gravity="center"
                android:src="@drawable/reading_book"/>
        </android.support.v7.widget.CardView>
    </GridLayout>