[UPDATE]
I solve the problem by adding addHeaderView :
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
          
        You would do that the same way as you would add headings in any other ListView, by teaching your ListAdapter to return heading rows as well as detail rows. At the low level, this involves overriding methods like getViewTypeCount() and getItemViewType() in your ListAdapter, plus having getView() know the difference between the row types. Or, use an existing high-level implementation like https://github.com/emilsjolander/StickyListHeaders or http://code.google.com/p/android-amazing-listview/ or any of the others found when searching for android listview headers.
Maybe it's a bit late but I think I have a simpler solution. In your Activity's layout, instead of adding a listView inside the DrawerLayout, you can add for example a LinearLayout, and you can easily add separators and rows. For example:
<RelativeLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <com.astuetz.viewpager.extensions.PagerSlidingTabStrip
            android:id="@+id/indicator"
            android:layout_height="48dip"
            android:layout_width="fill_parent"/>
        <ViewPager
            android:id="@+id/pager"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>
    </LinearLayout>
</RelativeLayout>
<LinearLayout 
    android:orientation="vertical"
    android:id="@+id/left_drawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="#111">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Separator 1"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="First button"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Separator 2"/>
</LinearLayout>
And in the Activity, you can add the listeners to the buttons.
Hope that helps!
Put a TextView above a ListView, and wrap it inside a vertical LinearLayout . Give to your ListView android:layout_weight="1"  and android:layout_height="0dip"