android - Changing color of selected listview item

Question

I'm using the FileExplorer library (open source) for Android in my project. The problem is that an item (file) selected in the list of the FileExplorer is shown in highly unreadable gray color. I'd like to customize this, but don't see any place where the color is assigned.

Activity source code does not contain any management of colors.

And here is the layout of list item:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">

<ImageView android:layout_alignParentLeft="true" android:id="@+id/fdrowimage"
    android:layout_height="35dp" android:layout_width="wrap_content"
    android:paddingRight="5dp" android:paddingLeft="3dp"></ImageView>
<TextView android:text="@+id/fdrowtext" android:layout_width="wrap_content"
    android:id="@+id/fdrowtext" android:layout_toRightOf="@+id/fdrowimage"
    android:layout_alignTop="@+id/fdrowimage" android:layout_alignBottom="@+id/fdrowimage"
    android:gravity="center_vertical" android:layout_height="35dp"
    android:textSize="23dp"</TextView> 

If I add android:textColorHighlight with custom color to the TextView, it does not take any effect. If I add android:textColor, it works, but changes text color for all items, which is not what I need.

Also I see a strange mention of color gray in strings.xml, but changing this value does not produce an effect as well.