Android Fragment: empty space on top

I built an app with fragments and I have a ListView with a search widget on top. This Listview layout is the layout for one fragment. Whenever I start the app there is an annoying white part on top of the SearchWidget that makes the whole Layout look weird and I can't seem to get rid of it. It is below the title. But Maybe I am doing something wrong, maybe this has something to do with the action bar? I am new to fragments and have never used action bar. Maybe I am also using it wrong. Is there a possibility to get rid of it, or should I do something differently? https://i.stack.imgur.com/saekc.jpg (image of the Layout - the white space is what i want to get rid of) ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" android:baselineAligned="false" android:orientation="horizontal" > <fragment android:id="@+id/listFragment" android:layout_width="0dp" android:layout_height="match_parent" android:layout_marginTop="?android:attr/actionBarSize" android:layout_weight="1.12" class="org.blabla.ListFragment" tools:layout="@layout/activity_people_list" > </fragment> ``` ``` <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" tools:context=".PeopleListActivity" > <SearchView android:id="@+id/searchView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_vertical" /> <ListView android:id="@+id/listView1" android:layout_width="fill_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout> ```