hostage/res/layout/fragment_threatmap.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context="de.tudarmstadt.informatik.hostage.ui2.fragment.MainActivity" >

    <fragment
            android:id="@+id/threatmapfragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            class="com.google.android.gms.maps.MapFragment" />

</RelativeLayout>