res/layout/header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@null"
    android:clickable="false"
    android:focusable="false"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/header_letter"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:focusable="false"
        android:textColor="@color/white"
        android:paddingLeft="5dp"
        android:textSize="14sp"
        android:textStyle="bold" />

</LinearLayout>