You could put both listviews with weights into a LinearLayout. See second picture: http://android4beginners.com/wp-content/uploads/2013/07/android_studio_linear_layout_example.png
All you need to do is set the weights of the listviews according to the design you were looking for.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main_rel"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:weightSum="2.0" >
<ListView
android:id="@+id/child_one"
android:layout_width="match_parent"
android:layout_height="0"
android:layout_weight="1.0"
android:background="#0000FF" >
</ListView>
<ListView
android:id="@+id/child_two"
android:layout_width="match_parent"
android:layout_height="0"
android:layout_weight="1.0"
android:background="#00FF00" >
</ListView>
</LinearLayout>