Fix the directory item height in grid view.

    android:elevation="@dimen/grid_item_elevation"

    android:focusable="true" >

    <!-- The height is 48px.

         paddingTop (9dp) + @dimen/check_icon_size (30dp) + paddingBottom (9dp) -->

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="horizontal"

        android:paddingBottom="16dp"

        android:paddingLeft="12dp"

        android:paddingBottom="9dp"

        android:paddingLeft="9dp"

        android:paddingRight="12dp"

        android:paddingTop="16dp"

        android:paddingTop="9dp"

        android:gravity="center_vertical">

        <FrameLayout