XML : Align TextView to top of RelativeLayout with ListView below

My TextView is aligning verticaly to the center of Layout, but I want it to be aligned to top, as it has to be header for ListView. I tried to put it in inner RelativeLayout, but it doesnt't help. My Layout.xml:

  <?xml version="1.0" encoding="utf-8"?>  <RelativeLayout xmlns:android="http://schemas.android.com/apk/re/android"xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent" >    <RelativeLayout  android:id="@+id/header"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:layout_alignParentTop="true"  android:background="#FC9"  android:gravity="center" >  <TextView      android:id="@+id/main_activity_header"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_alignParentTop="true"      android:layout_centerHorizontal="true"      android:layout_marginTop="20dp"      android:text="@string/header_main_activity"       android:background="#3F51B5"      android:textColor="#FFFFFF"      />  </RelativeLayout>      <ListView      android:id="@+id/menu"      android:layout_width="fill_parent"      android:layout_height="wrap_content"      android:layout_centerHorizontal="true"      android:layout_below="@id/header"      >  </ListView>  </RelativeLayout>    

In editor everything looks good, but, when I run my app on the device and list isn't fully populated, my TextView together with ListView aligns to the vertical center.

What I have to do to make it align to top of the layout?