src/main/res/layout/activity_activity_control.xml

<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"
		android:paddingLeft="@dimen/activity_horizontal_margin"
		android:paddingRight="@dimen/activity_horizontal_margin"
		android:paddingTop="@dimen/activity_vertical_margin"
		android:paddingBottom="@dimen/activity_vertical_margin"
		tools:context="org.libdll.so.am.ActivityControlActivity">

	<Button
	  android:layout_width="wrap_content"
	  android:layout_height="wrap_content"
	  android:text="Start"
	  android:id="@+id/button_start"
	  android:layout_alignParentTop="true"
	  android:layout_alignParentLeft="true"
	  android:layout_alignParentStart="true"/>

	<Button
	  android:layout_width="wrap_content"
	  android:layout_height="wrap_content"
	  android:text="Start with root"
	  android:id="@+id/button_start_with_root"
	  android:layout_alignParentTop="true"
	  android:layout_toRightOf="@+id/button_start"
	  android:layout_toEndOf="@+id/button_start"/>

	<Button
	  android:layout_width="wrap_content"
	  android:layout_height="wrap_content"
	  android:text="Kill all"
	  android:id="@+id/button_killall"
	  android:layout_below="@+id/button_start"
	  android:layout_alignParentLeft="true"
	  android:layout_alignParentStart="true"/>
</RelativeLayout>